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Table of Contents

 
 
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-Q
     
þ   QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the quarterly period ended March 31, 2011
OR
     
o   TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from to
Commission File Number 000-26041
F5 NETWORKS, INC.
(Exact name of registrant as specified in its charter)
     
WASHINGTON
(State or other jurisdiction of
incorporation or organization)
  91-1714307
(I.R.S. Employer Identification No.)
401 Elliott Avenue West
Seattle, Washington 98119
(Address of principal executive offices and zip code)
(206) 272-5555
(Registrant’s telephone number, including area code)
Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes þ No o
Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes þ No o
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):
             
Large accelerated filer þ   Accelerated filer o   Non-accelerated filer o (Do not check if a smaller reporting company)   Smaller reporting company o
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o No þ
The number of shares outstanding of the registrant’s common stock as of May 3, 2011 was 81,111,096.
 
 

 


 

F5 NETWORKS, INC.
QUARTERLY REPORT ON FORM 10-Q
For the Quarter Ended March 31, 2011
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PART I. FINANCIAL INFORMATION
Item 1. Financial Statements
F5 NETWORKS, INC.
CONSOLIDATED BALANCE SHEETS
(unaudited, in thousands)
                 
    March 31,     September 30,  
    2011     2010  
ASSETS
               
Current assets
               
Cash and cash equivalents
  $ 206,215     $ 168,754  
Short-term investments
    269,041       259,742  
Accounts receivable, net of allowances of $2,652 and $4,319
    142,903       112,132  
Inventories
    18,154       18,815  
Deferred tax assets
    8,759       8,767  
Other current assets
    45,767       37,745  
 
           
Total current assets
    690,839       605,955  
 
           
Property and equipment, net
    37,533       34,157  
Long-term investments
    521,920       433,570  
Deferred tax assets
    39,608       37,864  
Goodwill
    234,700       234,700  
Other assets, net
    13,923       15,946  
 
           
Total assets
  $ 1,538,523     $ 1,362,192  
 
           
LIABILITIES AND SHAREHOLDERS’ EQUITY
               
Current liabilities
               
Accounts payable
  $ 30,827     $ 21,180  
Accrued liabilities
    63,101       61,768  
Deferred revenue
    248,157       204,137  
 
           
Total current liabilities
    342,085       287,085  
 
           
Other long-term liabilities
    18,952       16,153  
Deferred revenue, long-term
    65,183       55,256  
 
           
Total long-term liabilities
    84,135       71,409  
 
           
Commitments and contingencies (Note 5)
               
Shareholders’ equity
               
Preferred stock, no par value; 10,000 shares authorized, no shares outstanding
           
Common stock, no par value; 200,000 shares authorized, 80,709 and 80,355 shares issued and outstanding
    515,973       517,215  
Accumulated other comprehensive loss
    (4,632 )     (3,241 )
Retained earnings
    600,962       489,724  
 
           
Total shareholders’ equity
    1,112,303       1,003,698  
 
           
Total liabilities and shareholders’ equity
  $ 1,538,523     $ 1,362,192  
 
           
The accompanying notes are an integral part of these consolidated financial statements.

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F5 NETWORKS, INC.
CONSOLIDATED INCOME STATEMENTS
(unaudited, in thousands, except per share data)
                                 
    Three months ended     Six months ended  
    March 31,     March 31,  
    2011     2010     2011     2010  
Net revenues
                               
Products
  $ 173,710     $ 129,559     $ 345,202     $ 248,777  
Services
    103,862       76,509       201,304       148,447  
 
                       
Total
    277,572       206,068       546,506       397,224  
 
                       
Cost of net revenues
                               
Products
    31,423       27,419       63,037       53,461  
Services
    19,250       13,997       36,599       27,084  
 
                       
Total
    50,673       41,416       99,636       80,545  
 
                       
Gross profit
    226,899       164,652       446,870       316,679  
 
                       
Operating expenses
                               
Sales and marketing
    89,332       69,644       176,157       135,286  
Research and development
    34,507       29,134       67,113       55,854  
General and administrative
    19,846       16,016       40,530       31,969  
 
                       
Total
    143,685       114,794       283,800       223,109  
 
                       
Income from operations
    83,214       49,858       163,070       93,570  
Other income, net
    1,568       2,291       4,113       3,996  
 
                       
Income before income taxes
    84,782       52,149       167,183       97,566  
Provision for income taxes
    29,207       19,005       55,945       35,143  
 
                       
Net income
  $ 55,575     $ 33,144     $ 111,238     $ 62,423  
 
                       
Net income per share — basic
  $ 0.69     $ 0.42     $ 1.38     $ 0.79  
 
                       
Weighted average shares — basic
    80,809       79,394       80,726       79,147  
 
                       
Net income per share — diluted
  $ 0.68     $ 0.41     $ 1.36     $ 0.77  
 
                       
Weighted average shares — diluted
    81,622       80,737       81,670       80,630  
 
                       
The accompanying notes are an integral part of these consolidated financial statements.

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F5 NETWORKS, INC.
CONSOLIDATED STATEMENT OF SHAREHOLDERS’ EQUITY
(unaudited, in thousands)
                                         
    Six months ended March 31, 2011  
                    Accumulated                
                    Other             Total  
    Common Stock     Comprehensive     Retained     Shareholders’  
    Shares     Amount     Income/(Loss)     Earnings     Equity  
Balance, September 30, 2010
    80,355     $ 517,215     $ (3,241 )   $ 489,724     $ 1,003,698  
Exercise of employee stock options
    115       1,807                   1,807  
Issuance of stock under employee stock purchase plan
    123       7,418                   7,418  
Issuance of restricted stock
    719                          
Repurchase of common stock
    (603 )     (71,526 )                 (71,526 )
Tax benefit from employee stock transactions
          16,353                   16,353  
Stock-based compensation
          44,706                   44,706  
Comprehensive income:
                                       
Net income
                      111,238        
Foreign currency translation adjustment
                (428 )            
Unrealized loss on securities, net of tax
                (963 )            
Comprehensive income
                            109,847  
 
                             
Balance, March 31, 2011
    80,709     $ 515,973     $ (4,632 )   $ 600,962     $ 1,112,303  
 
                             
The accompanying notes are an integral part of these consolidated financial statements.

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F5 NETWORKS, INC.
CONSOLIDATED STATEMENTS OF CASH FLOWS
(unaudited, in thousands)
                 
    Six months ended  
    March 31,  
    2011     2010  
Operating activities
               
Net income
  $ 111,238     $ 62,423  
Adjustments to reconcile net income to net cash provided by operating activities:
               
Realized gain on disposition of assets and investments
    (182 )     (13 )
Stock-based compensation
    44,706       33,585  
Provisions for doubtful accounts and sales returns
    (14 )     1,257  
Depreciation and amortization
    10,536       12,088  
Deferred income taxes
    (1,080 )     5,340  
Loss on auction rate securities put option
          19  
Gain on trading auction rate securities
          (19 )
Changes in operating assets and liabilities, net of amounts acquired:
               
Accounts receivable
    (30,757 )     16,331  
Inventories
    661       (2,653 )
Other current assets
    (7,798 )     (4,481 )
Other assets
    (140 )     (2,038 )
Accounts payable and accrued liabilities
    13,253       (13,283 )
Deferred revenue
    53,945       43,356  
 
           
Net cash provided by operating activities
    194,368       151,912  
 
           
Investing activities
               
Purchases of investments
    (441,160 )     (331,410 )
Sales and maturities of investments
    342,207       230,595  
Investment of restricted cash
    38       (22 )
Acquisition of intangible assets
    (80 )      
Purchases of property and equipment
    (11,704 )     (6,840 )
 
           
Net cash used in investing activities
    (110,699 )     (107,677 )
 
           
Financing activities
               
Excess tax benefits from stock-based compensation
    16,286       9,700  
Proceeds from the exercise of stock options and purchases of stock under employee stock purchase plan
    9,218       19,149  
Repurchase of common stock
    (71,526 )     (35,000 )
 
           
Net cash used in financing activities
    (46,022 )     (6,151 )
 
           
Net increase in cash and cash equivalents
    37,647       38,084  
Effect of exchange rate changes on cash and cash equivalents
    (186 )     (397 )
Cash and cash equivalents, beginning of period
    168,754       110,837  
 
           
Cash and cash equivalents, end of period
  $ 206,215     $ 148,524  
 
           
The accompanying notes are an integral part of these consolidated financial statements.

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F5 NETWORKS, INC.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (unaudited)
1. Summary of Significant Accounting Policies
Description of Business
     F5 Networks, Inc. (the “Company”) provides products and services to help companies manage their Internet Protocol (IP) traffic and file storage infrastructure efficiently and securely. The Company’s application delivery networking products improve the performance, availability and security of applications on Internet-based networks. Internet traffic between network-based applications and clients passes through these devices where the content is inspected to ensure that it is safe and modified as necessary to ensure that it is delivered securely and in a way that optimizes the performance of both the network and the applications. The Company’s storage virtualization products simplify and reduce the cost of managing files and file storage devices, and ensure fast, secure, easy access to files for users and applications. The Company also offers a broad range of services that include consulting, training, maintenance and other technical support services.
Basis of Presentation
     The year end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States of America. In the opinion of management, the unaudited consolidated financial statements reflect all adjustments, consisting only of normal recurring adjustments, necessary for their fair statement in conformity with accounting principles generally accepted in the United States of America. Certain information and footnote disclosures normally included in annual financial statements have been condensed or omitted in accordance with the rules and regulations of the Securities and Exchange Commission. The information included in this Form 10-Q should be read in conjunction with Management’s Discussion and Analysis of Financial Condition and Results of Operations and financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2010.
     Certain reclassifications have been made to the prior year’s financial statements to conform to the fiscal year 2011 presentation. Such reclassifications did not affect total revenues, operating income or net income.
Revenue Recognition
     The Company sells products through distributors, resellers, and directly to end users. Revenue is recognized provided that all of the following criteria have been met:
     Persuasive evidence of an arrangement exists. Evidence of an arrangement generally consists of a purchase order issued pursuant to the terms and conditions of a distributor, reseller or end user agreement.
     Delivery has occurred. The Company uses shipping or related documents, or written evidence of customer acceptance, when applicable, to verify delivery or completion of any performance terms.
     The sales price is fixed or determinable. The Company assesses whether the sales price is fixed or determinable based on payment terms associated with the transaction and whether the sales price is subject to refund or adjustment.
     Collectability is reasonable assured. The Company assesses collectability primarily based on the creditworthiness of the customer as determined by credit checks and related analysis, as well as the Customer’s payment history.
     In certain regions where the Company does not have the ability to reasonably estimate returns, the Company defers revenue on sales to its distributors until they have received information from the channel partner indicating that the product has been sold to the end-user customer. Payment terms to domestic customers are generally net 30 days to net 45 days. Payment terms to international customers range from net 30 days to net 120 days based on normal and customary trade practices in the individual markets. The Company offers extended payment terms to certain customers, in which case, revenue is recognized when payments are due.

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     Whenever product, training services and post-contract customer support (“PCS”) elements are sold together, a portion of the sales price is allocated to each element based on their respective fair values as determined when the individual elements are sold separately. Revenue from the sale of products is recognized when the product has been shipped and the customer is obligated to pay for the product. When rights of return are present and the Company cannot estimate returns, it recognizes revenue when such rights of return lapse. Revenues for PCS are recognized on a straight-line basis over the service contract term. PCS includes a limited period of telephone support updates, repair or replacement of any failed product or component that fails during the term of the agreement, bug fixes and rights to upgrades, when and if available. Consulting services are customarily billed at fixed hourly rates, plus out-of-pocket expenses, and revenues are recognized when the consulting has been completed. Training revenue is recognized when the training has been completed.
     In October 2009, the Financial Accounting Standards Board (“FASB”) amended the accounting standards for revenue recognition to remove from the scope of industry-specific software revenue recognition guidance any tangible products containing software components and non-software components that operate together to deliver the products essential functionality. In addition, the FASB amended the accounting standards for certain multiple element revenue arrangements to:
    Provide updated guidance on whether multiple elements exist, how the elements in an arrangement should be separated, and how the arrangement consideration should be allocated to the separate elements;
 
    Require an entity to allocate arrangement consideration to each element based on a selling price hierarchy, where the selling price for an element is based on vendor-specific objective evidence (“VSOE”), if available, third-party evidence (“TPE”), if available and VSOE is not available; or the best estimate of selling price (“BESP”), if neither VSOE or TPE is available; and
 
    Eliminate the use of the residual method and require an entity to allocate arrangement consideration using the selling price hierarchy.
     The Company adopted this guidance in the first quarter of fiscal year 2011 on a prospective basis for applicable arrangements originating or materially modified after October 1, 2010. The impact of this adoption was not material to the Company’s financial position and results of operations for the three and six months ended March 31, 2011.
     The majority of the Company’s products are hardware appliances which contain software essential to the overall functionality of the products. Accordingly, the Company no longer recognizes revenue on sales of these products in accordance with the industry-specific software revenue recognition guidance.
     For all transactions entered into prior to the first quarter of fiscal year 2011 and for sales of nonessential and stand-alone software after October 1, 2010, the Company allocates revenue for arrangements with multiple elements based on the software revenue recognition guidance. Software revenue recognition guidance requires revenue earned on software arrangements involving multiple elements to be allocated to each element based on the relative fair values of those elements. The fair value of an element must be based on VSOE. Where fair value of certain elements is not available, revenue is recognized on the “residual method” based on the fair value of undelivered elements. If evidence of the fair value of one or more undelivered elements does not exist, all revenue is deferred and recognized at the earlier of the delivery of those elements or the establishment of fair value of the remaining undelivered elements.
     For transactions entered into subsequent to the adoption of the amended revenue recognition standards that are multiple-element arrangements, the arrangement consideration is allocated to each element based on the relative selling prices of all of the elements in the arrangement using the fair value hierarchy in the amended revenue recognition guidance.
     Consistent with the methodology used under the previous accounting guidance, the Company establishes VSOE for its products, training services, PCS and consulting services based on the sales price charged for each element when sold separately. The sales price is discounted from the applicable list price based on various factors including the type of customer, volume of sales, geographic region and program level. The Company’s list prices are generally not fair value as discounts may be given based on the factors enumerated above. The Company believes that the fair value of its consulting services is represented by the billable consulting rate per hour, based on the rates they charge customers when they purchase standalone consulting services. The price of consulting services is not based on the type of customer, volume of sales, geographic region or program level.

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     The Company uses historical sales transactions to determine whether VSOE can be established for each of the elements. In most instances, VSOE of fair value is the sales price of actual standalone (unbundled) transactions within the past 12 month period that are priced within a reasonable range, which the Company has determined to be plus or minus 15% of the median sales price of each respective price list.
     VSOE of PCS is based on standalone sales since the Company does not provide stated renewal rates to its customers. In accordance with the Company’s PCS pricing practice (supported by standalone renewal sales), renewal contracts are priced as a percentage of the undiscounted product list price. The PCS renewal percentages may vary, depending on the type and length of PCS purchased. The Company offers standard and premium PCS, and the term generally ranges from one to three years. The Company employs a bell-shaped-curve approach in evaluating VSOE of fair value of PCS. Under this approach, the Company considers VSOE of the fair value of PCS to exist when a substantial majority of its standalone PCS sales fall within a narrow range of pricing.
     The Company is typically not able to determine TPE for its products or services. TPE is determined based on competitor prices for similar elements when sold separately. Generally, the Company’s go-to-market strategy differs from that of other competitive products or services in its markets and the Company’s offerings contain a significant level of differentiation such that the comparable pricing of products with similar functionality cannot be obtained. Furthermore, the Company is unable to reliably determine the selling prices on a stand-alone basis of similar products offered by its competitors.
     When the Company is unable to establish selling price of its non-software elements using VSOE or TPE, the Company uses BESP in its allocation of arrangement consideration. The objective of BESP is to determine the price at which the Company would transact a sale if the product or service were sold on a stand-alone basis. The Company determines BESP for a product or service by considering multiple factors including, but not limited to, cost of products, gross margin objectives, pricing practices, geographies, customer classes and distribution channels.
     The Company has established and regularly validates the VSOE of fair value and BESP for elements in its multiple element arrangements. The Company accounts for taxes collected from customers and remitted to governmental authorities on a net basis and excluded from revenues.
Goodwill
     Goodwill represents the excess purchase price over the estimated fair value of net assets acquired as of the acquisition date. The Company tests goodwill for impairment on an annual basis and between annual tests when impairment indicators are identified, and goodwill is written down when impaired. Goodwill was recorded in connection with the acquisition of Acopia Networks, Inc. in fiscal year 2007, Swan Labs, Inc. in fiscal year 2006, MagniFire Websystems, Inc. in fiscal year 2004 and uRoam, Inc. in fiscal year 2003.
     The Company performs its annual goodwill impairment test during the second fiscal quarter, or whenever events or changes in circumstances indicate that the carrying amount of goodwill may not be recoverable. The first step of the test identifies whether potential impairment may have occurred, while the second step of the test measures the amount of the impairment, if any. Impairment is recognized when the carrying amount of goodwill exceeds its fair value. For its annual goodwill impairment analysis, the Company operates under one reporting unit. The Company determined the fair value of its reporting unit based on the Company’s enterprise value. In March 2011, the Company completed its annual impairment test and concluded there was no impairment of goodwill.
Stock-Based Compensation
     The Company accounts for stock-based compensation using the straight-line attribution method for recognizing compensation expense. The Company recognized $21.8 million and $16.5 million of stock-based compensation expense for the three months ended March 31, 2011 and 2010, respectively, and $44.7 million and $33.6 million for the six months ended March 31, 2011 and 2010, respectively. As of March 31, 2011, there was $70.2 million of total unrecognized stock-based compensation cost, the majority of which will be recognized over the next two years. Going forward, stock-based compensation expenses may increase as the Company issues additional equity-based awards to continue to attract and retain key employees.
     The Company issues incentive awards to its employees through stock-based compensation consisting of restricted stock units (“RSUs”). On August 2, 2010, the Company awarded approximately 910,000 RSUs to employees and executive officers pursuant to the Company’s annual equity and retention awards programs. The value of RSUs is determined using the fair value method, which in this case, is based on the number of shares granted and the quoted price of the Company’s common stock on the date of grant.

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     The Company recognizes compensation expense for only the portion of restricted stock units that are expected to vest. Therefore, the Company applies estimated forfeiture rates that are derived from historical employee termination behavior. Based on historical differences with forfeitures of stock-based awards granted to the Company’s executive officers and Board of Directors versus grants awarded to all other employees, the Company has developed separate forfeiture expectations for these two groups. The Company’s estimated forfeiture rate in the second quarter of fiscal year 2011 is 2.7% for grants awarded to the Company’s executive officers and Board of Directors, and 9.7% for grants awarded to all other employees. If the actual number of forfeitures differs from those estimated by management, additional adjustments to compensation expense may be required in future periods.
     In August 2010, the Company granted 181,334 and 83,000 RSUs to certain current executive officers as part of the annual equity and retention awards programs, respectively. Fifty percent of the aggregate number of RSUs granted as part of the annual equity awards program vest in equal quarterly increments over three years, until such portion of the grant is fully vested on August 1, 2013.
     One-sixth of the annual equity awards RSU grant, or a portion thereof, is subject to the Company achieving specified quarterly revenue and EBITDA goals during the period beginning in the fourth quarter of fiscal year 2010 through the third quarter of fiscal year 2011. In each case, 50% of the quarterly performance stock grant is based on achieving at least 80% of the quarterly revenue goal and the other 50% is based on achieving at least 80% of the quarterly EBITDA goal. The quarterly performance stock grant is paid linearly above 80% of the targeted goals. At least 100% of both goals must be attained in order for the quarterly performance stock grant to be awarded over 100%. Each goal is evaluated individually and subject to the 80% achievement threshold and 100% over-achievement threshold. The remaining 33.33% of this annual equity awards RSU grant shall be subject to performance based vesting for each of the four quarter periods beginning with the fourth quarters of fiscal years 2011 and 2012 (16.66% in each period). The Compensation Committee of the Board of Directors will set applicable performance targets and vesting formulas for each of these periods. All RSUs granted as part of the retention awards program fully vest on August 1, 2013.
     In August 2009, the Company granted 420,000 RSUs to certain current executive officers. Fifty percent of the aggregate number of RSUs granted at such time vest in equal quarterly increments over two years, until such portion of the grant is fully vested on August 1, 2011. Twenty-five percent of the RSU grant, or a portion thereof, was subject to the Company achieving specified quarterly revenue and EBITDA goals during the period beginning in the fourth quarter of fiscal year 2009 through the third quarter of fiscal year 2010 and the remaining twenty-five percent is subject to the Company achieving specified quarterly revenue and EBITDA goals during the period beginning in the fourth quarter of fiscal year 2010 through the third quarter of fiscal year 2011. In each case, 50% of the quarterly performance stock grant is based on achieving at least 80% of the quarterly revenue goal and the other 50% is based on achieving at least 80% of the quarterly EBITDA goal. The quarterly performance stock grant is paid linearly above 80% of the targeted goals. At least 100% of both goals must be attained in order for the quarterly performance stock grant to be awarded over 100%. Each goal is evaluated individually and subject to the 80% achievement threshold and 100% over-achievement threshold.
     The Company recognizes compensation costs for awards with performance conditions when it concludes it is probable that the performance condition will be achieved. The Company reassesses the probability of vesting at each balance sheet date and adjusts compensation costs based on the probability assessment.
Common Stock Repurchase
     On October 22, 2008, the Company announced that its Board of Directors approved a program to repurchase up to an additional $200 million of the Company’s outstanding common stock. As of September 30, 2010, the Company had $37.6 million remaining to purchase shares as part of this repurchase program. On October 26, 2010, the Company announced that its Board of Directors approved a new program to repurchase up to an additional $200 million of the Company’s outstanding common stock. Acquisitions for the share repurchase programs will be made from time to time in private transactions or open market purchases as permitted by securities laws and other legal requirements. The programs can be terminated at any time. As of May 3, 2011, the Company had repurchased and retired 5,134,929 shares at an average price of $45.51 per share and the Company had $166.0 million remaining to purchase shares as part of its repurchase programs.
Earnings Per Share
     Basic net income per share is computed by dividing net income by the weighted average number of common shares outstanding during the period. Diluted net income per share is computed by dividing net income by the weighted average number of common and dilutive common stock equivalent shares outstanding during the period. The Company’s nonvested restricted stock awards and restricted stock units do not have nonforfeitable rights to dividends or dividend equivalents.

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     The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share data):
                                 
    Three months ended     Six months ended  
    March 31,     March 31,  
    2011     2010     2011     2010  
Numerator
                               
Net income
  $ 55,575     $ 33,144     $ 111,238     $ 62,423  
 
                       
Denominator
                               
Weighted average shares outstanding — basic
    80,809       79,394       80,726       79,147  
Dilutive effect of common shares from stock options and restricted stock units
    813       1,343       944       1,483  
 
                       
Weighted average shares outstanding — diluted
    81,622       80,737       81,670       80,630  
 
                       
Basic net income per share
  $ 0.69     $ 0.42     $ 1.38     $ 0.79  
 
                       
Diluted net income per share
  $ 0.68     $ 0.41     $ 1.36     $ 0.77  
 
                       
     An immaterial amount of common shares potentially issuable from stock options for the three and six months ended March 31, 2011 and 2010, are excluded from the calculation of diluted earnings per share because the exercise price was greater than the average market price of common stock for the respective periods.
Comprehensive Income
     Comprehensive income includes certain changes in equity that are excluded from net income. Specifically, unrealized gains (losses) on securities and foreign currency translation adjustments are included in accumulated other comprehensive loss. Comprehensive income and its components were as follows (in thousands):
                                 
    Three months ended     Six months ended  
    March 31,     March 31,  
    2011     2010     2011     2010  
Net Income
  $ 55,575     $ 33,144     $ 111,238     $ 62,423  
Unrealized loss on securities, net of tax
    (309 )     (310 )     (963 )     (811 )
Foreign currency translation adjustment
    159       (435 )     (428 )     (446 )
 
                       
Total comprehensive income
  $ 55,425     $ 32,399     $ 109,847     $ 61,166  
 
                       
Recent Accounting Pronouncements
     Management believes there have been no significant changes during the six months ended March 31, 2011, to the items disclosed as recently adopted accounting pronouncements in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in the Company’s Annual Report on Form 10-K for the year ended September 30, 2010. For a further discussion, refer to the “Recent Accounting Pronouncements” discussion contained therein.
2. Fair Value Measurements
     In accordance with the authoritative guidance on fair value measurements and disclosure under GAAP, the Company determines fair value using a fair value hierarchy that distinguishes between market participant assumptions developed based on market data obtained from sources independent of the reporting entity, and the reporting entity’s own assumptions about market participant assumptions developed based on the best information available in the circumstances and expands disclosure about fair value measurements.
     Fair value is the price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date, essentially the exit price.
     The levels of fair value hierarchy are:
     Level 1: Quoted prices in active markets for identical assets and liabilities at the measurement date.

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     Level 2: Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.
     Level 3: Unobservable inputs for which there is little or no market data available. These inputs reflect management’s assumptions of what market participants would use in pricing the asset or liability.
     Level 1 investments are valued based on quoted market prices in active markets and include the Company’s cash equivalent investments. Level 2 investments, which include investments that are valued based on quoted prices in markets that are not active, broker or dealer quotations, or alternative pricing sources with reasonable levels of price transparency, include the Company’s corporate bonds and notes, municipal bonds and notes and U.S. government securities. Fair values for the Company’s level 2 investments are based on similar assets without applying significant judgments. In addition, all of the Company’s level 2 investments have a sufficient level of trading volume to demonstrate that the fair values used are appropriate for these investments.
     A financial instrument’s level within the fair value hierarchy is based upon the lowest level of any input that is significant to the fair value measurement. However, the determination of what constitutes “observable” requires significant judgment by the Company. The Company considers observable data to be market data which is readily available, regularly distributed or updated, reliable and verifiable, not proprietary, and provided by independent sources that are actively involved in the relevant market.
     The Company’s financial assets measured at fair value on a recurring basis subject to the disclosure requirements at March 31, 2011, were as follows (in thousands):
                                 
    Fair Value Measurements at Reporting Date Using        
    Quoted Prices in     Significant     Significant        
    Active Markets for     Other Observable     Unobservable     Fair Value at  
    Identical Securities     Inputs     Inputs     March 31,  
    (Level 1)     (Level 2)     (Level 3)     2011  
Cash equivalents
  $ 38,786     $     $     $ 38,786  
Short-term investments
                               
Available-for-sale securities — corporate bonds and notes
          118,939             118,939  
Available-for-sale securities — municipal bonds and notes
          54,966             54,966  
Available-for-sale securities — U.S. government securities
          95,136             95,136  
Long-term investments
                               
Available-for-sale securities — corporate bonds and notes
          139,413             139,413  
Available-for-sale securities — municipal bonds and notes
          24,585             24,585  
Available-for-sale securities — U.S. government securities
          341,542             341,542  
Available-for-sale securities — auction rate securities
                16,380       16,380  
 
                       
Total
  $ 38,786     $ 774,581     $ 16,380     $ 829,747  
 
                       
     The Company’s financial assets measured at fair value on a recurring basis subject to the disclosure requirements at September 30, 2010, were as follows (in thousands):
                                 
    Fair Value Measurements at Reporting Date Using        
    Quoted Prices in     Significant     Significant        
    Active Markets for     Other Observable     Unobservable     Fair Value at  
    Identical Securities     Inputs     Inputs     September 30,  
    (Level 1)     (Level 2)     (Level 3)     2010  
Cash equivalents
  $ 26,987     $     $     $ 26,987  
Short-term investments
                               
Available-for-sale securities — corporate bonds and notes
          120,124             120,124  
Available-for-sale securities — municipal bonds and notes
          77,063             77,063  
Available-for-sale securities — U.S. government securities
          62,555             62,555  
Long-term investments
                               
Available-for-sale securities — corporate bonds and notes
          174,053             174,053  
Available-for-sale securities — municipal bonds and notes
          22,094             22,094  
Available-for-sale securities — U.S. government securities
          221,380             221,380  
Available-for-sale securities — auction rate securities
                16,043       16,043  
 
                       
Total
  $ 26,987     $ 677,269     $ 16,043     $ 720,299  
 
                       

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     Due to the auction failures of the Company’s auction rate securities (“ARS”) that began in the second quarter of fiscal year 2008, there are still no quoted prices in active markets for similar assets as of March 31, 2011. Therefore, the Company has classified its ARS as level 3 financial assets. The following table provides a reconciliation between the beginning and ending balances of items measured at fair value on a recurring basis in the table above that used significant unobservable inputs (Level 3) (in thousands):
                                 
    Three months ended     Six months ended  
    March 31,     March 31,  
    2011     2010     2011     2010  
Balance, beginning of period
  $ 16,260     $ 41,893     $ 16,043     $ 41,595  
Total losses realized or unrealized:
                               
Included in earnings (other income, net)
          500             (19 )
Included in other comprehensive income
    120       110       337       408  
Recognition of put option to earnings
          (500 )           19  
Settlements
          (4,550 )           (4,550 )
Transfers into and/or out of level 3
                       
 
                       
Balance, end of period
  $ 16,380     $ 37,453     $ 16,380     $ 37,453  
 
                       
Gains attributable to assets still held as of end of period
    120       110       337       408  
     Financial assets are considered Level 3 when their fair values are determined using pricing models, discounted cash flow methodologies or similar techniques and at least one significant model assumption or input is unobservable or there is limited market activity such that the determination of fair value requires significant judgment or estimation. Level 3 investment securities primarily include certain ARS for which there was a decrease in the observation of market pricing. At March 31, 2011, the values of these securities were estimated primarily using discounted cash flow analysis that incorporated transaction details such as contractual terms, maturity, timing and amount of future cash flows, as well as assumptions about liquidity and credit valuation adjustments of marketplace participants at March 31, 2011.
     The Company uses the fair value hierarchy for financial assets and liabilities. The Company’s non-financial assets and liabilities, which include goodwill, intangible assets, and long-lived assets, are not required to be carried at fair value on a recurring basis. These non-financial assets and liabilities are measured at fair value on a non-recurring basis when there is an indicator of impairment, and they are recorded at fair value only when impairment is recognized. The Company reviews goodwill and intangible assets for impairment annually, during the second quarter of each fiscal year, or as circumstances indicate the possibility of impairment. The Company monitors the carrying value of long-lived assets for impairment whenever events or changes in circumstances indicate its carrying amount may not be recoverable. During the three months ended March 31, 2011, the Company did not recognize any impairment charges related to goodwill, intangible assets, or long-lived assets.
3. Short-Term and Long-Term Investments
     Short-term investments consist of the following (in thousands):
                                 
    Cost or     Gross     Gross        
    Amortized     Unrealized     Unrealized        
March 31, 2011   Cost     Gains     Losses     Fair Value  
Corporate bonds and notes
  $ 118,508     $ 447     $ (16 )   $ 118,939  
Municipal bonds and notes
    54,908       62       (4 )     54,966  
U.S. government securities
    95,068       69       (1 )     95,136  
 
                       
 
  $ 268,484     $ 578     $ (21 )   $ 269,041  
 
                       
                                 
    Cost or     Gross     Gross        
    Amortized     Unrealized     Unrealized        
September 30, 2010   Cost     Gains     Losses     Fair Value  
Corporate bonds and notes
  $ 119,829     $ 318     $ (23 )   $ 120,124  
Municipal bonds and notes
    76,886       182       (5 )     77,063  
U.S. government securities
    62,390       165             62,555  
 
                       
 
  $ 259,105     $ 665     $ (28 )   $ 259,742  
 
                       

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     Long-term investments consist of the following (in thousands):
                                 
    Cost or     Gross     Gross        
    Amortized     Unrealized     Unrealized        
March 31, 2011   Cost     Gains     Losses     Fair Value  
Corporate bonds and notes
  $ 138,841     $ 712     $ (140 )   $ 139,413  
Municipal bonds and notes
    24,650       22       (87 )     24,585  
Auction rate securities
    19,000             (2,620 )     16,380  
U.S. government securities
    342,099       50       (607 )     341,542  
 
                       
 
  $ 524,590     $ 784     $ (3,454 )   $ 521,920  
 
                       
                                 
    Cost or     Gross     Gross        
    Amortized     Unrealized     Unrealized        
September 30, 2010   Cost     Gains     Losses     Fair Value  
Corporate bonds and notes
  $ 172,493     $ 1,582     $ (22 )   $ 174,053  
Municipal bonds and notes
    22,045       67       (18 )     22,094  
Auction rate securities
    19,000             (2,957 )     16,043  
U.S. government securities
    221,262       200       (82 )     221,380  
 
                       
 
  $ 434,800     $ 1,849     $ (3,079 )   $ 433,570  
 
                       
     The amortized cost and fair value of fixed maturities at March 31, 2011, by contractual years-to-maturity, are presented below (in thousands):
                 
    Cost or        
    Amortized        
    Cost     Fair Value  
One year or less
  $ 268,484     $ 269,041  
Over one year
    524,590       521,920  
 
           
 
  $ 793,074     $ 790,961  
 
           
     The cost or amortized cost values of the Company’s fixed maturities include $19.0 million of available-for-sale ARS as of March 31, 2011 and September 30, 2010.
     The following table summarizes investments that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for more than 12 months as of March 31, 2011 (in thousands):
                                                 
    Less Than 12 Months     12 Months or Greater     Total  
            Gross             Gross             Gross  
    Fair     Unrealized     Fair     Unrealized     Fair     Unrealized  
March 31, 2011   Value     Losses     Value     Losses     Value     Losses  
Corporate bonds and notes
  $ 73,383     $ (156 )   $     $     $ 73,383     $ (156 )
Municipal bonds and notes
    17,630       (89 )     8,453       (2 )     26,083       (91 )
Auction rate securities
                16,380       (2,620 )     16,380       (2,620 )
U.S. government securities
    244,532       (608 )                 244,532       (608 )
 
                                   
Total
  $ 335,545     $ (853 )   $ 24,833     $ (2,622 )   $ 360,378     $ (3,475 )
 
                                   
     The Company invests in securities that are rated investment grade or better. The unrealized losses on investments for the first six months of fiscal year 2011 were primarily caused by reductions in the values of the ARS due to the illiquid markets and were partially offset by unrealized gains related to interest rate decreases.
     ARS are variable-rate debt securities. The Company limits its investments in ARS to securities that carry an AAA/A- (or equivalent) rating from recognized rating agencies and limits the amount of credit exposure to any one issuer. At the time of the Company’s initial investment and at the date of this report, all ARS were in compliance with the Company’s investment policy. In the past, the auction process allowed investors to obtain immediate liquidity if so desired by selling the securities at their face amounts. Liquidity for these securities has historically been provided by an auction process that resets interest rates on these investments on average every 7-35 days. However, as has been reported in the financial press, the disruptions in the credit markets adversely affected the auction market for these types of securities.
     Beginning in February 2008, auctions failed for approximately $53.4 million in par value of municipal ARS the Company held because sell orders exceeded buy orders. The funds associated with failed auctions will not be accessible until the issuer calls the security, a successful auction occurs, a buyer is found outside the auction process or the security otherwise matures.

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4. Inventories
     The Company outsources the manufacturing of its pre-configured hardware platforms to contract manufacturers, who assemble each product to the Company’s specifications. As protection against component shortages and to provide replacement parts for its service teams, the Company also stocks limited supplies of certain key product components. The Company reduces inventory to net realizable value based on excess and obsolete inventories determined primarily by historical usage and forecasted demand. Inventories consist of hardware and related component parts and are recorded at the lower of cost or market (as determined by the first-in, first-out method).
     Inventories consist of the following (in thousands):
                 
    March 31,     September 30,  
    2011     2010  
Finished goods
  $ 13,876     $ 14,949  
Raw materials
    4,278       3,866  
 
           
 
  $ 18,154     $ 18,815  
 
           
5. Commitments and Contingencies
Guarantees and Product Warranties
     In the normal course of business to facilitate sales of its products, the Company indemnifies other parties, including customers, resellers, lessors, and parties to other transactions with the Company, with respect to certain matters. The Company has agreed to hold the other party harmless against losses arising from a breach of representations or covenants, or out of intellectual property infringement or other claims made against certain parties. These agreements may limit the time within which an indemnification claim can be made and the amount of the claim. The Company has entered into indemnification agreements with its officers and directors, and the Company’s bylaws contain similar indemnification obligations to the Company’s agents. It is not possible to determine the maximum potential amount under these indemnification agreements due to the limited history of prior indemnification claims and the unique facts and circumstances involved in each particular agreement.
     The Company offers warranties of one year for hardware for those customers without service contracts, with the option of purchasing additional warranty coverage in yearly increments. The Company accrues for warranty costs as part of its cost of sales based on associated material product costs and technical support labor costs. Accrued warranty costs as of March 31, 2011 and March 31, 2010 were not material.
Purchase Commitments
     The Company currently has arrangements with contract manufacturers and other suppliers for the manufacturing of its products. The arrangement with the primary contract manufacturer allows them to procure component inventory on the Company’s behalf based on a rolling production forecast provided by the Company. The Company is obligated to the purchase of component inventory that the contract manufacturer procures in accordance with the forecast, unless they give notice of order cancellation in advance of applicable lead times. As of March 31, 2011, the Company was committed to purchase approximately $13.5 million of such inventory during the next quarter.
Legal Proceedings
     Derivative Suits. Beginning on or about May 24, 2006, several derivative actions were filed against certain of the Company’s current and former directors and officers. These derivative lawsuits were filed in: (1) the Superior Court of King County, Washington, as In re F5 Networks, Inc. State Court Derivative Litigation (Case No. 06-2-17195-1 SEA), which consolidates Adams v. Amdahl, et al. (Case No. 06-2-17195-1 SEA), Wright v. Amdahl, et al. (Case No. 06-2-19159-5 SEA), and Sommer v. McAdam, et al. (Case No. 06-2-26248-4 SEA) (the “State Court Derivative Litigation”); and (2) in the U.S. District Court for the Western District of Washington, as In re F5 Networks, Inc. Derivative Litigation, Master File No. C06-0794RSL, which consolidated Hutton v. McAdam, et al. (Case No. 06-794RSL), Locals 302 and 612 of the International Union of Operating Engineers-Employers Construction Industry Retirement Trust v. McAdam et al. (Case No. C06-1057RSL), and Easton v. McAdam et al. (Case No. C06-1145RSL) (the “Federal Court Derivative Litigation”). On August 2, 2007, another derivative lawsuit, Barone v. McAdam et al. (Case No. C07-1200P) was filed in the U.S. District Court for the Western District of Washington. The Barone lawsuit was designated a related case to the Federal Court Derivative Litigation on September 4, 2007.

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     On September 24, 2010, the Company entered into a Stipulation of Settlement (the “Stipulation”) in connection with the Federal Court Derivative Litigation. On October 21, 2010, the United States District Court for the Western District of Washington issued an order granting preliminary approval of the settlement resolving the claims asserted by the plaintiffs against the individual defendants. On January 6, 2011 the Court entered a final order approving settlement of the Federal Court Derivative Litigation. Effectiveness of the settlement of the Federal Court Derivative Litigation was conditioned on dismissal of the State Court Derivative Litigation. On January 19, 2011, the Superior Court of King County entered a final order dismissing the State Court Derivative Litigation.
     The Company is not aware of any additional pending legal proceedings that, individually or in the aggregate, would have a material adverse effect on the Company’s business, operating results, or financial condition. The Company may in the future be party to litigation arising in the ordinary course of business, including claims that we allegedly infringe upon third-party intellectual property rights. Such claims, even if not meritorious, could result in the expenditure of significant financial and managerial resources.
6. Income Taxes
     The effective tax rate was 34.4% and 36.4% for the three months ended March 31, 2011 and 2010, respectively. The decrease in effective tax rate was primarily due to an increased benefit resulting from the United States Domestic Production Activities deduction.
     At March 31, 2011, the Company has classified approximately $8.2 million of unrecognized tax liabilities as a non-current liability. It is reasonably possible that the Company’s existing liabilities for uncertain tax benefits may change within the next twelve months primarily due to the progression of audits in progress or the expiration of statutes of limitation. Due to the nature of the various audits, the Company cannot reasonably estimate a range of potential changes in such benefits.
     The Company recognizes interest and, if applicable, penalties for any uncertain tax positions. This interest and penalty expense will be a component of income tax expense. For the three and six months ended March 31, 2011, the Company accrued an immaterial amount of interest expense related to its liability for unrecognized tax benefits. All unrecognized tax benefits, if recognized, would affect the effective tax rate.
     The Company and its subsidiaries are subject to U.S. federal income tax as well as the income tax of multiple state and foreign jurisdictions. Major jurisdictions where there are wholly owned subsidiaries of F5 Networks, Inc. which require income tax filings include the United Kingdom, Japan, Australia and Germany. The earliest periods open for review by local taxing authorities are fiscal years 2008, 2010, 2007 and 2006 for the United Kingdom, Japan, Australia and Germany, respectively. Within the next four fiscal quarters, the statute of limitations will begin to close on the fiscal years ended 2006 and 2007 tax returns filed in various states and the fiscal year ended 2007 federal income tax return.
7. Geographic Sales and Significant Customers
     Operating segments are defined as components of an enterprise for which separate financial information is available and evaluated regularly by the chief operating decision-maker, or decision-making group, in deciding how to allocate resources and in assessing performance. The Company does business in four main geographic regions: the Americas (primarily the United States); Europe, the Middle East, and Africa (EMEA); Japan; and the Asia Pacific region (APAC). The Company’s chief operating decision-making group reviews financial information presented on a consolidated basis accompanied by information about revenues by geographic region. The Company’s foreign offices conduct sales, marketing and support activities. Revenues are attributed by geographic location based on the location of the customer. The Company’s assets are primarily located in the United States and not allocated to any specific region. Therefore, geographic information is presented only for net revenue.

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     The following presents revenues by geographic region (in thousands):
                                 
    Three months ended     Six months ended  
    March 31,     March 31,  
    2011     2010     2011     2010  
Americas
  $ 163,802     $ 118,407     $ 321,721     $ 229,412  
EMEA
    59,881       49,284       119,586       95,604  
Japan
    15,564       15,553       32,125       27,927  
Asia Pacific
    38,325       22,824       73,074       44,281  
 
                       
 
  $ 277,572     $ 206,068     $ 546,506     $ 397,224  
 
                       
     One worldwide distributor of the Company’s products accounted for 19.6% and 19.2% of total net revenue for the three and six month periods ended March 31, 2011, respectively. Two worldwide distributors accounted for 25.0% and 24.6% of total net revenue for the three and six month periods ended March 31, 2010, respectively. No other distributors accounted for more than 10% of total net revenue.
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations
     The following discussion of our financial condition and results of operations contains forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934 and Section 27A of the Securities Act of 1933. These statements include, but are not limited to, statements about our plans, objectives, expectations, strategies, intentions or other characterizations of future events or circumstances and are generally identified by the words “expects,” “anticipates,” “intends,” “plans,” “believes,” “seeks,” “estimates,” and similar expressions. These forward-looking statements are based on current information and expectations and are subject to a number of risks and uncertainties. Our actual results could differ materially from those expressed or implied by these forward-looking statements. Factors that could cause or contribute to such differences include, but are not limited to, those discussed under “Item 1A. Risk Factors” herein and in other documents we file from time to time with the Securities and Exchange Commission. We assume no obligation to revise or update any such forward-looking statements.
Overview
     We are a global provider of appliances consisting of software and hardware and services that help companies efficiently and securely manage the delivery, optimization and security of application and data traffic on Internet-based networks, and to optimize the performance and utilization of data storage infrastructure and other network resources. We market and sell our products primarily through multiple indirect sales channels in the Americas (primarily the United States); Europe, the Middle East, and Africa (EMEA); Japan; and the Asia Pacific region (APAC). Enterprise customers (Fortune 1000 or Business Week Global 1000 companies) in the technology, telecommunications, financial services, transportation, education, manufacturing and health care industries, along with government customers, continue to make up the largest percentage of our customer base.
     Our management team monitors and analyzes a number of key performance indicators in order to manage our business and evaluate our financial and operating performance on a consolidated basis. Those indicators include:
  Revenues. The majority of our revenues are derived from sales of our Application Delivery Networking (“ADN”) products and related software modules; BIG-IP Local Traffic Manager, BIG-IP Global Traffic Manager, BIG-IP Link Controller, BIG-IP Application Security Manager, BIG-IP Edge Gateway, BIG-IP WAN Optimization module, BIG-IP Access Policy Manager, WebAccelerator, and FirePass SSL VPN appliance; and our ARX file virtualization products. We also derive revenues from the sales of services including annual maintenance contracts, training and consulting services. We carefully monitor the sales mix of our revenues within each reporting period. We believe customer acceptance rates of our new products and feature enhancements are indicators of future trends. We also consider overall revenue concentration by customer and by geographic region as additional indicators of current and future trends.
 
  Cost of revenues and gross margins. We strive to control our cost of revenues and thereby maintain our gross margins. Significant items impacting cost of revenues are hardware costs paid to our contract manufacturers, third-party software license fees, amortization of developed technology and personnel and overhead expenses. Our margins have remained relatively stable; however, factors such as sales price, product mix, inventory obsolescence, returns, component price increases and warranty costs could significantly impact our gross margins from quarter to quarter and represent significant indicators we monitor on a regular basis.
 
  Operating expenses. Operating expenses are substantially driven by personnel and related overhead expenses. Existing headcount and future hiring plans are the predominant factors in analyzing and forecasting future operating expense trends. Other significant operating expenses that we monitor include marketing and promotions, travel, professional fees, computer costs related to the development of new products, facilities and depreciation expenses.

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  Liquidity and cash flows. Our financial condition remains strong with significant cash and investments and no long term debt. The increase in cash and investments for the first six months of fiscal year 2011 was primarily due to net income from operations, with operating activities providing cash of $194.4 million. This increase was partially offset by $71.5 million of cash used to repurchase outstanding common stock under our stock repurchase program in the first half of fiscal year 2011. Going forward, we believe the primary driver of cash flows will be net income from operations. Capital expenditures for the first six months of fiscal year 2011 were comprised primarily of information technology infrastructure and equipment to support the growth of our core business activities. We will continue to evaluate possible acquisitions of, or investments in businesses, products, or technologies that we believe are strategic, which may require the use of cash.
 
  Balance sheet. We view cash, short-term and long-term investments, deferred revenue, accounts receivable balances and day’s sales outstanding as important indicators of our financial health. Deferred revenues continued to increase in the second quarter of fiscal year 2011 due to growth in the amount of annual maintenance contracts purchased on new products and maintenance renewal contracts related to our existing product installation base. Our day’s sales outstanding for the second quarter of fiscal year 2011 was 46.
Summary of Critical Accounting Policies and Estimates
     The preparation of our financial condition and results of operations requires us to make judgments and estimates that may have a significant impact upon our financial results. We believe that, of our significant accounting policies, the following require estimates and assumptions that require complex, subjective judgments by management, which can materially impact reported results: revenue recognition; reserve for doubtful accounts; reserve for product returns; reserve for warranties; accounting for income taxes; stock-based compensation; investments; goodwill impairment; and the fair value measurements of financial assets and liabilities. None of these accounting policies and estimates with the exception of the revenue recognition policy discussed below, have significantly changed since our annual report on Form 10-K for the year ended September 30, 2010 (“Form 10-K”). Critical accounting policies and estimates are more fully described in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in the Form 10-K. Actual results may differ from these estimates under different assumptions or conditions.
     We believe the following critical accounting policy, as well as those discussed in our Form 10-K, affect the more significant estimates and judgments used in the preparation of our financial statements.
Revenue Recognition
     We sell products through distributors, resellers, and directly to end users. Revenue is recognized provided that all of the following criteria have been met:
     Persuasive evidence of an arrangement exists. Evidence of an arrangement generally consists of a purchase order issued pursuant to the terms and conditions of a distributor, reseller or end user agreement.
     Delivery has occurred. We use shipping or related documents, or written evidence of customer acceptance, when applicable, to verify delivery or completion of any performance terms.
     The sales price is fixed or determinable. We assess whether the sales price is fixed or determinable based on payment terms associated with the transaction and whether the sales price is subject to refund or adjustment.
     Collectability is reasonable assured. We assess collectability primarily based on the creditworthiness of the customer as determined by credit checks and related analysis, as well as the Customer’s payment history.
     In certain regions where we do not have the ability to reasonably estimate returns, we defer revenue on sales to our distributors until they have received information from the channel partner indicating that the product has been sold to the end-user customer. Payment terms to domestic customers are generally net 30 days to net 45 days. Payment terms to international customers range from net 30 days to net 120 days based on normal and customary trade practices in the individual markets. We offer extended payment terms to certain customers, in which case, revenue is recognized when payments are due.
     Whenever product, training services and post-contract customer support (“PCS”) elements are sold together, a portion of the sales price is allocated to each element based on their respective fair values as determined when the individual elements are sold separately. Revenue from the sale of products is recognized when the product has been shipped and the customer is obligated to pay for the

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product. When rights of return are present and we cannot estimate returns, we recognize revenue when such rights of return lapse. Revenues for PCS are recognized on a straight-line basis over the service contract term. PCS includes a limited period of telephone support updates, repair or replacement of any failed product or component that fails during the term of the agreement, bug fixes and rights to upgrades, when and if available. Consulting services are customarily billed at fixed hourly rates, plus out-of-pocket expenses, and revenues are recognized when the consulting has been completed. Training revenue is recognized when the training has been completed.
     In October 2009, the Financial Accounting Standards Board (“FASB”) amended the accounting standards for revenue recognition to remove from the scope of industry-specific software revenue recognition guidance any tangible products containing software components and non-software components that operate together to deliver the products essential functionality. In addition, the FASB amended the accounting standards for certain multiple element revenue arrangements to:
    Provide updated guidance on whether multiple elements exist, how the elements in an arrangement should be separated, and how the arrangement consideration should be allocated to the separate elements;
 
    Require an entity to allocate arrangement consideration to each element based on a selling price hierarchy, where the selling price for an element is based on vendor-specific objective evidence (“VSOE”), if available, third-party evidence (“TPE”), if available and VSOE is not available; or the best estimate of selling price (“BESP”), if neither VSOE or TPE is available; and
 
    Eliminate the use of the residual method and require an entity to allocate arrangement consideration using the selling price hierarchy.
     We adopted this guidance in the first quarter of fiscal year 2011 on a prospective basis for applicable arrangements originating or materially modified after October 1, 2010. The impact of this adoption was not material to our financial position and results of operations for the three and six months ended March 31, 2011.
     The majority of our products are hardware appliances which contain software essential to the overall functionality of the products. Accordingly, we no longer recognize revenue on sales of these products in accordance with the industry-specific software revenue recognition guidance.
     For all transactions entered into prior to the first quarter of fiscal year 2011 and for sales of nonessential and stand-alone software after October 1, 2010, we allocate revenue for arrangements with multiple elements based on the software revenue recognition guidance. Software revenue recognition guidance requires revenue earned on software arrangements involving multiple elements to be allocated to each element based on the relative fair values of those elements. The fair value of an element must be based on VSOE. Where fair value of certain elements is not available, revenue is recognized on the “residual method” based on the fair value of undelivered elements. If evidence of the fair value of one or more undelivered elements does not exist, all revenue is deferred and recognized at the earlier of the delivery of those elements or the establishment of fair value of the remaining undelivered elements.
     For transactions entered into subsequent to the adoption of the amended revenue recognition standards that are multiple-element arrangements, the arrangement consideration is allocated to each element based on the relative selling prices of all of the elements in the arrangement using the fair value hierarchy in the amended revenue recognition guidance.
     Consistent with the methodology used under the previous accounting guidance, we establish VSOE for our products, training services, PCS and consulting services based on the sales price charged for each element when sold separately. The sales price is discounted from the applicable list price based on various factors including the type of customer, volume of sales, geographic region and program level. Our list prices are generally not fair value as discounts may be given based on the factors enumerated above. We believe that the fair value of our consulting services is represented by the billable consulting rate per hour, based on the rates we charge customers when they purchase standalone consulting services. The price of consulting services is not based on the type of customer, volume of sales, geographic region or program level.
     We use historical sales transactions to determine whether VSOE can be established for each of the elements. In most instances, VSOE of fair value is the sales price of actual standalone (unbundled) transactions within the past 12 month period that are priced within a reasonable range, which we have determined to be plus or minus 15% of the median sales price of each respective price list.

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     VSOE of PCS is based on standalone sales since we do not provide stated renewal rates to our customers. In accordance with our PCS pricing practice (supported by standalone renewal sales), renewal contracts are priced as a percentage of the undiscounted product list price. The PCS renewal percentages may vary, depending on the type and length of PCS purchased. We offer standard and premium PCS, and the term generally ranges from one to three years. We employ a bell-shaped-curve approach in evaluating VSOE of fair value of PCS. Under this approach, we consider VSOE of the fair value of PCS to exist when a substantial majority of our standalone PCS sales fall within a narrow range of pricing.
     We are typically not able to determine TPE for our products or services. TPE is determined based on competitor prices for similar elements when sold separately. Generally, our go-to-market strategy differs from that of other competitive products or services in our markets and our offerings contain a significant level of differentiation such that the comparable pricing of products with similar functionality cannot be obtained. Furthermore, we are unable to reliably determine the selling prices on a stand-alone basis of similar products offered by our competitors.
     When we are unable to establish selling price of our non-software elements using VSOE or TPE, we use BESP in our allocation of arrangement consideration. The objective of BESP is to determine the price at which we would transact a sale if the product or service were sold on a stand-alone basis. We determine BESP for a product or service by considering multiple factors including, but not limited to, cost of products, gross margin objectives, pricing practices, geographies, customer classes and distribution channels.
     We have established and regularly validate the VSOE of fair value and BESP for elements in our multiple element arrangements. We account for taxes collected from customers and remitted to governmental authorities on a net basis and excluded from revenues.
Results of Operations
     The following discussion and analysis should be read in conjunction with our consolidated financial statements, related notes and risk factors included elsewhere in this Quarterly Report on Form 10-Q.
                                 
    Three months ended     Six months ended  
    March 31,     March 31,  
    2011     2010     2011     2010  
    (in thousands, except percentages)  
Net Revenues
                               
Products
  $ 173,710     $ 129,559     $ 345,202     $ 248,777  
Services
    103,862       76,509       201,304       148,447  
 
                       
Total
  $ 277,572     $ 206,068     $ 546,506     $ 397,224  
 
                       
Percentage of net revenues
                               
Products
    62.6 %     62.9 %     63.2 %     62.6 %
Services
    37.4       37.1       36.8       37.4  
 
                       
Total
    100.0 %     100.0 %     100.0 %     100.0 %
 
                       
     Net revenues. Total net revenues increased 34.7% and 37.6% for the three and six months ended March 31, 2011, respectively, from the same periods in the prior year. Overall revenue growth for the three and six months ended March 31, 2011 was primarily due to increased service and product revenues as a result of our increased installed base of products and increased demand for our core ADN products, including application security and WAN optimization products. International revenues were 41.0% and 41.1% of total net revenues for the three and six months ended March 31, 2011, respectively, compared to 42.5% and 42.2% for the same periods in the prior year, respectively. We expect international sales will continue to represent a significant portion of net revenues, although we cannot provide assurance that international revenues as a percentage of net revenues will remain at current levels.
     Net product revenues increased 34.1% and 38.8% for the three and six months ended March 31, 2011, respectively, from the same periods in the prior year. The increase in net product revenues for the three and six months ended March 31, 2011 was primarily due to an increase of $42.2 million and $93.6 million in sales of our ADN products from the same periods in the prior year, respectively. Sales of our ADN products represented 97.5% and 97.4% of product revenues for the three and six months ended March 31, 2011, respectively, compared to 98.2% and 97.5% of product revenues for the three and six months ended March 31, 2010, respectively. We are now including our FirePass SSL VPN product as a component of ADN revenue.
     Net service revenues increased 35.8% and 35.6% for the three and six months ended March 31, 2011, respectively, from the same periods in the prior year. The increase in net service revenues was primarily due to increases in the purchase or renewal of maintenance contracts driven by additions to our installed base of products.

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     Avnet Technology Solutions, one of our worldwide distributors, accounted for 19.6% and 19.2% of our total net revenue for the three and six months ended March 31, 2011, respectively. Avnet Technology Solutions and Tech Data, two of our worldwide distributors, accounted for 13.8% and 11.2% of our total net revenue for the three months ended March 31, 2010, respectively. Avnet Technology Solutions and Tech Data accounted for 12.8% and 11.8% of our total net revenue for the six months ended March 31, 2010, respectively. Avnet Technology Solutions accounted for 14.5% of our accounts receivable as of March 31, 2011. Avnet Technology Solutions accounted for 10.0% of our accounts receivable as of March 31, 2010. No other distributors accounted for more than 10% of total net revenue or receivables.
                                 
    Three months ended     Six months ended  
    March 31,     March 31,  
    2011     2010     2011     2010  
    (in thousands, except percentages)  
Cost of net revenues and Gross Margin
                               
Products
  $ 31,423     $ 27,419     $ 63,037     $ 53,461  
Services
    19,250       13,997       36,599       27,084  
 
                       
Total
    50,673       41,416       99,636       80,545  
 
                       
Gross profit
  $ 226,899     $ 164,652     $ 446,870     $ 316,679  
Percentage of net revenues and Gross Margin (as a percentage of related net revenue)
                               
Products
    18.1 %     21.2 %     18.3 %     21.5 %
Services
    18.5       18.3       18.2       18.2  
 
                       
Total
    18.3       20.1       18.2       20.3  
 
                       
Gross profit
    81.7 %     79.9 %     81.8 %     79.7 %
 
                       
     Cost of net product revenues. Cost of net product revenues consist of finished products purchased from our contract manufacturers, manufacturing overhead, freight, warranty, provisions for excess and obsolete inventory and amortization expenses in connection with developed technology from acquisitions. Cost of net product revenues increased 14.6% and 17.9% for the three and six months ended March 31, 2011, respectively, as compared to the same periods in the prior year. The increase in cost of net product revenues was primarily due to a higher volume of units shipped along with an increase in warranty expense.
     Cost of net service revenues. Cost of net service revenues consist of the salaries and related benefits of our professional services staff, travel, facilities and depreciation expenses. For the three and six months ended March 31, 2011, cost of net service revenues as a percentage of net service revenues remained relatively consistent with the same periods in the prior year at 18.5% and 18.2%, respectively. Professional services headcount at the end of March 2011 increased to 476 from 384 at the end of March 2010. In addition, cost of net service revenues included stock-based compensation expense of $1.8 million and $3.6 million for the three and six months ended March 31, 2011, respectively, compared to $1.4 million and $2.9 million for the same periods in the prior year, respectively.
                                 
    Three months ended     Six months ended  
    March 31,     March 31,  
    2011     2010     2011     2010  
    (in thousands, except percentages)  
Operating expenses
                               
Sales and marketing
  $ 89,332     $ 69,644     $ 176,157     $ 135,286  
Research and development
    34,507       29,134       67,113       55,854  
General and administrative
    19,846       16,016       40,530       31,969  
 
                       
Total
  $ 143,685     $ 114,794     $ 283,800     $ 223,109  
 
                       
Operating expenses (as a percentage of net revenue)
                               
Sales and marketing
    32.2 %     33.8 %     32.2 %     34.1 %
Research and development
    12.4       14.1       12.3       14.1  
General and administrative
    7.2       7.8       7.4       8.0  
 
                       
Total
    51.8 %     55.7 %     51.9 %     56.2 %
 
                       
     Sales and marketing. Sales and marketing expenses consist of salaries, commissions and related benefits of our sales and marketing staff, the costs of our marketing programs, including public relations, advertising and trade shows, travel, facilities, and depreciation expenses. Sales and marketing expenses increased 28.3% and 30.2% for the three and six months ended March 31, 2011, respectively, from the comparable periods in the prior year. The increase in sales and marketing expense was primarily due to an increase of $12.7 million and $24.1 million in commissions and personnel costs for the three and six months ended March 31, 2011,

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respectively, from the comparable periods in the prior year. The increased commissions and personnel costs were driven by growth in sales and marketing employee headcount and increased sales volume for the corresponding period. Sales and marketing headcount at the end of March 2011 increased to 979 from 757 at the end of March 2010. Sales and marketing expense included stock-based compensation expense of $8.4 million and $17.1 million for the three and six months ended March 31, 2011, respectively, compared to $6.4 million and $13.1 million for the same periods in the prior year, respectively. The increase in sales and marketing expense was also due to investments in marketing promotions and initiatives aimed at promoting our brand and creating market awareness of our technology and our products.
     Research and development. Research and development expenses consist of the salaries and related benefits for our product development personnel, prototype materials and other expenses related to the development of new and improved products, facilities and depreciation expenses. Research and development expenses increased 18.4% and 20.2% for the three and six months ended March 31, 2011, respectively, from the comparable periods in the prior year. The increase in research and development expense was primarily due to an increase of $3.3 million and $6.2 million in personnel costs for the three and six months ended March 31, 2011, respectively, from the comparable periods in the prior year. In addition, research and development expense included year over year increases in computer equipment and software costs of $1.3 million and $2.5 million for the three and six months ended March 31, 2011, respectively, to support the development of new and improved products. Research and development headcount at the end of March 2011 increased to 554 from 471 at the end of March 2010. Research and development expense included stock-based compensation expense of $5.6 million and $11.5 million for the three and six months ended March 31, 2011, respectively, compared to $4.6 million and $9.4 million for the same periods in the prior year, respectively. We expect research and development expenses to remain consistent as a percentage of net revenue in the foreseeable future.
     General and administrative. General and administrative expenses consist of the salaries, benefits and related costs of our executive, finance, information technology, human resource and legal personnel, third-party professional service fees, bad debt charges, facilities and depreciation expenses. General and administrative expenses increased 23.9% and 26.8% for the three and six months ended March 31, 2011, respectively, from the comparable periods in the prior year. The increase in general and administrative expense was primarily due to an increase of $1.3 million and $2.8 million in personnel costs for the three and six months ended March 31, 2011, respectively, from the comparable periods in the prior year. In addition, fees paid to outside consultants for legal and information technology services increased $1.0 million and $2.0 million for the three and six months ended March 31, 2011, respectively, from the comparable periods in the prior year. Stock-based compensation expense was $5.7 million and $11.7 million for the three and six months ended March 31, 2011, respectively, compared to $3.9 million and $7.8 million for the same periods in the prior year, respectively. General and administrative headcount at the end of March 2011 increased to 245 from 211 at the end of March 2010.
                                 
    Three months ended     Six months ended  
    March 31,     March 31,  
    2011     2010     2011     2010  
    (in thousands, except percentages)  
Other income and income taxes
                               
Income from operations
  $ 83,214     $ 49,858     $ 163,070     $ 93,570  
Other income, net
    1,568       2,291       4,113       3,996  
 
                       
Income before income taxes
    84,782       52,149       167,183       97,566  
Provision for income taxes
    29,207       19,005       55,945       35,143  
 
                       
Net income
  $ 55,575     $ 33,144     $ 111,238     $ 62,423  
 
                       
Other income and income taxes (as percentage of net revenue)
                               
Income from operations
    30.0 %     24.2 %     29.8 %     23.6 %
Other income, net
    0.5       1.1       0.8       1.0  
 
                       
Income before income taxes
    30.5       25.3       30.6       24.6  
Provision for income taxes
    10.5       9.2       10.2       8.9  
 
                       
Net income
    20.0 %     16.1 %     20.4 %     15.7 %
 
                       
     Other income, net. Other income, net, consists of interest income and foreign currency transaction gains and losses. Other income, net, decreased 31.6% for the three months ended March 31, 2011, compared to the same period in the prior year. Other income, net, increased 2.9% for the six months ended March 31, 2011, compared to the same period in the prior year. The decrease in other income, net for the three months ended March 31, 2011 was primarily due to a decrease in foreign currency transaction gains, as well as interest income compared to the same period in the prior year. The decrease in interest income for the three months ended March 31, 2011 was primarily due to a decline in interest rates from the prior year.
     Provision for income taxes. We recorded a 34.4% provision for income taxes for the three month period ended March 31, 2011. The reduction in effective tax rate compared to the three month period ended March 31, 2010 was primarily due to an increase in the benefit received from the domestic manufacturing deduction. At March 31, 2011, we did not have a valuation allowance on any of our

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deferred tax assets in any of the jurisdictions in which we operate because we believe that these assets are more likely than not to be realized. In making this determination we have considered projected future taxable income and ongoing prudent and feasible tax planning strategies in assessing the appropriateness of a valuation allowance. Our net deferred tax assets at March 31, 2011 and March 31, 2010 were $48.4 million and $50.4 million, respectively. Our worldwide effective tax rate may fluctuate based on a number of factors including variations in projected taxable income in the various geographic locations in which we operate, changes in the valuation of our net deferred tax assets, resolution of potential exposures, tax positions taken on tax returns filed in the various geographic locations in which we operate, and the introduction of new accounting standards or changes in tax laws or interpretations thereof in the various geographic locations in which we operate. We have recorded liabilities to address potential tax exposures related to business and income tax positions we have taken that could be challenged by taxing authorities. The ultimate resolution of these potential exposures may be greater or less than the liabilities recorded which could result in an adjustment to our future tax expense.
Liquidity and Capital Resources
     Cash and cash equivalents, short-term investments and long-term investments totaled $997.2 million as of March 31, 2011 compared to $862.1 million as of September 30, 2010, representing an increase of $135.1 million. The increase was primarily due to cash provided by operating activities of $194.4 million for the six months ended March 31, 2011 which was partially offset by $71.5 million of additional cash required for the repurchase of outstanding common stock under our stock repurchase program. The increase in cash flow from operations for the first six months of fiscal year 2011 resulted from increased net income combined with changes in operating assets and liabilities, as adjusted for various non-cash items including stock-based compensation, depreciation and amortization charges. Based on our current operating and capital expenditure forecasts, we believe that our existing cash and investment balances, excluding auction rate securities (“ARS”), together with cash generated from operations should be sufficient to meet our operating requirements for at least the next twelve months.
     At March 31, 2011, we held $16.4 million in fair value of tax-exempt ARS, which are variable-rate debt securities and have a long-term maturity with the interest rates being reset through Dutch auctions that are typically held every 7, 28 or 35 days. The securities have historically traded at par and are callable at par at the option of the issuer. Interest is typically paid at the end of each auction period or semi-annually. We limit our investments in ARS to securities that carry a AAA/A- (or equivalent) rating from recognized rating agencies and limit the amount of credit exposure to any one issuer. At the time of initial investment and at the date of this Quarterly Report on Form 10-Q, all of our ARS were in compliance with our investment policy.
     Beginning in February 2008, auctions failed for approximately $53.4 million in par value of municipal ARS we held because sell orders exceeded buy orders. When these auctions failed to clear, higher interest rates for those securities went into effect. However, the funds associated with these failed auctions will not be accessible until the issuer calls the security, a successful auction occurs, a buyer is found outside of the auction process or the security matures.
     We have no reason to believe that any of the underlying issuers of our ARS are presently at risk of default. The underlying assets of the municipal ARS we hold, including the securities for which auctions have failed, are generally student loans which are guaranteed by the U.S. government. Through March 31, 2011, we have continued to receive interest payments on the ARS in accordance with their terms. We believe we will be able to liquidate our investments without significant loss primarily due to the government guarantee of the underlying securities. However, due to uncertainty in the ARS market, we believe certain of these available-for-sale investments may remain illiquid for longer than twelve months and as a result, we have classified $19.0 million (par value) of our ARS as long-term as of March 31, 2011.
     Cash used in investing activities was $110.7 million for the six months ended March 31, 2011, compared to cash used in investing activities of $107.7 million for the same period in the prior year. Investing activities include purchases, sales and maturities of available-for-sale securities, capital expenditures and changes in restricted cash requirements. The amount of cash used in investing activities for the six months ended March 31, 2011 was primarily due to the purchase of investments and capital expenditures related to maintaining our operations worldwide partially offset by the sales and maturity of investments.
     Cash used in financing activities was $46.0 million for the six months ended March 31, 2011, compared to cash used in financing activities of $6.2 million for the same period in the prior year. Our financing activities for the six months ended March 31, 2011 consisted of cash required for the repurchase of outstanding common stock under our stock repurchase program of $71.5 million, partially offset by cash received from the exercise of employee stock options and stock purchases under our employee stock purchase plan of $9.2 million and excess tax benefits related to share-based compensation of $16.3 million.

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Obligations and Commitments
     As of March 31, 2011, our principal commitments consisted of obligations outstanding under operating leases. We lease our facilities under operating leases that expire at various dates through 2022. There have been no material changes in our principal lease commitments compared to those discussed in the Form 10-K.
     We outsource the manufacturing of our pre-configured hardware platforms to contract manufacturers who assemble each product to our specifications. Our agreement with our largest contract manufacturer allows them to procure component inventory on our behalf based upon a rolling production forecast. We are contractually obligated to purchase the component inventory in accordance with the forecast, unless we give notice of order cancellation in advance of applicable lead times. As of March 31, 2011, we were committed to purchase approximately $13.5 million of such inventory during the next quarter.
Recent Accounting Pronouncements
     The anticipated impact of recent accounting pronouncements is discussed in Note 1 to the accompanying Notes to Consolidated Financial Statements of this Quarterly Report on Form 10-Q.
Risk Factors that May Affect Future Results
     This Quarterly Report on Form 10-Q contains forward-looking statements that involve risks and uncertainties. Our business, operating results, financial performance and share price may be materially adversely affected by a number of factors, including but not limited to the following risk factors, any one of which could cause actual results to vary materially from anticipated results or from those expressed in any forward-looking statements made by us in this Quarterly Report on Form 10-Q or in other reports, press releases or other statements issued from time to time. Additional factors that may cause such a difference are set forth elsewhere in this Quarterly Report on Form 10-Q.
  Our quarterly and annual operating results may fluctuate in future periods, which may cause our stock price to fluctuate
     Our quarterly and annual operating results have varied significantly in the past and could vary significantly in the future, which makes it difficult for us to predict our future operating results. Our operating results may fluctuate due to a variety of factors, many of which are outside of our control, including the changing and recently volatile U.S. and global economic environment, and any of which may cause our stock price to fluctuate. In particular, we anticipate that the size of customer orders may increase as we continue to focus on larger business accounts. A delay in the recognition of revenue, even from just one account, may have a significant negative impact on our results of operations for a given period. In the past, a majority of our sales have been realized near the end of a quarter. Accordingly, a delay in an anticipated sale past the end of a particular quarter may negatively impact our results of operations for that quarter, or in some cases, that fiscal year. Additionally, we have exposure to the credit risks of some of our customers and sub-tenants. Although we have programs in place that are designed to monitor and mitigate the associated risk, there can be no assurance that such programs will be effective in reducing our credit risks adequately. We monitor individual payment capability in granting credit arrangements, seek to limit the total credit to amounts we believe our customers can pay and maintain reserves we believe are adequate to cover exposure for potential losses. If there is a deterioration of a sub-tenant’s or a major customer’s creditworthiness or actual defaults are higher than expected, future losses, if incurred, could harm our business and have a material adverse effect on our operating results. Further, our operating results may be below the expectations of securities analysts and investors in future quarters or years. Our failure to meet these expectations will likely harm the market price of our common stock. Such a decline could occur, and has occurred in the past, even when we have met our publicly stated revenue and/or earnings guidance.
  In addition to other risks listed in this “Risk Factors” section, factors that may affect our operating results include, but are not limited to:
    fluctuations in demand for our products and services due to changing market conditions, pricing conditions, technology evolution, seasonality, or other changes in the global economic environment;
    changes or fluctuations in sales and implementation cycles for our products and services;
    reduced visibility into our customers’ spending and implementation plans
    reductions in customers’ budgets for data center and other IT purchases or delays in these purchases;

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    fluctuations in our gross margins, including the factors described herein which may contribute to such fluctuations;
 
    our ability to control costs, including operating expenses, the costs of hardware and software components, and other manufacturing costs;
    our ability to develop, introduce and gain market acceptance of new products, technologies and services, and our success in new and evolving markets;
    any significant changes in the competitive environment, including the entry of new competitors or the substantial discounting of products or services;
    the timing and execution of product transitions or new product introductions, and related inventory costs;
    variations in sales channels, product costs, or mix of products sold;
    our ability to establish and manage our distribution channels, and the effectiveness of any changes we make to our distribution model;
    the ability of our contract manufacturers and suppliers to provide component parts, hardware platforms and other products in a timely manner;
    benefits anticipated from our investments in sales, marketing, product development, manufacturing or other activities; and
    changes in tax laws or regulations, or other accounting rules.
Our success depends on our timely development of new products and features, market acceptance of new product offerings and proper management of the timing of the life cycle of our products
     The application delivery networking and file virtualization markets are characterized by rapid technological change, frequent new product introductions, changes in customer requirements and evolving industry standards. Our continued success depends on our ability to identify and develop new products and new features for our existing products to meet the demands of these changes, and the acceptance of those products and features by our existing and target customers. If we are unable to identify, develop and deploy new products and new product features on a timely basis, our business and results of operations may be harmed.
     The current development cycle for our products is on average 12-24 months. The introduction of new products or product enhancements may shorten the life cycle of our existing products, or replace sales of some of our current products, thereby offsetting the benefit of even a successful product introduction, and may cause customers to defer purchasing our existing products in anticipation of the new products. This could harm our operating results by decreasing sales, increasing our inventory levels of older products and exposing us to greater risk of product obsolescence. We have also experienced, and may in the future experience, delays in developing and releasing new products and product enhancements. This has led to, and may in the future lead to, delayed sales, increased expenses and lower quarterly revenue than anticipated. Also, in the development of our products, we have experienced delays in the prototyping of our products, which in turn has led to delays in product introductions. In addition, complexity and difficulties in managing product transitions at the end-of-life stage of a product can create excess inventory of components associated with the outgoing product that can lead to increased expenses. Any or all of the above problems could materially harm our business and results of operations.
  Our success depends on sales and continued innovation of our Application Delivery Networking product lines
     For the fiscal year ended September 30, 2010 and the six months ended March 31, 2011, we derived approximately 97.2% and 97.4% of our net product revenues, respectively, or approximately 61.8% and 61.5% of our total net revenues, respectively, from sales of our Application Delivery Networking (“ADN”) product lines. We expect to continue to derive a significant portion of our net revenues from sales of our ADN products in the future. Implementation of our strategy depends upon these products being able to solve critical network availability and performance problems for our customers. If our ADN products are unable to solve these problems for our customers or if we are unable to sustain the high levels of innovation in our ADN product feature set needed to maintain leadership in what will continue to be a competitive market environment, our business and results of operations will be harmed.

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We may not be able to compete effectively in the emerging application delivery networking and file virtualization markets
     The markets we serve are new, rapidly evolving and highly competitive, and we expect competition to persist and intensify in the future. Our principal competitors in the application delivery networking market include Cisco Systems, Inc., Citrix Systems, Inc., Brocade Communications Systems, Inc. and Radware Ltd. In the adjacent WAN Optimization Controller market, we compete with Riverbed Technology, Inc., Juniper Networks, Inc., Blue Coat Systems, Inc., Cisco and Citrix. In the file virtualization market, we compete with EMC Corporation. We expect to continue to face additional competition as new participants enter our markets. As we continue to expand globally, we may see new competitors in different geographic regions. In addition, larger companies with significant resources, brand recognition, and sales channels may form alliances with or acquire competing application delivery networking solutions from other companies and emerge as significant competitors. Potential competitors may bundle their products or incorporate an Internet traffic management or security component into existing products in a manner that discourages users from purchasing our products. Any of these circumstances may limit our opportunities for growth and negatively impact our financial performance.
The average selling price of our products may decrease and our costs may increase, which may negatively impact gross profits
     It is possible that the average selling prices of our products will decrease in the future in response to competitive pricing pressures, increased sales discounts, new product introductions by us or our competitors or other factors. Therefore, in order to maintain our gross profits, we must develop and introduce new products and product enhancements on a timely basis and continually reduce our product costs. Our failure to do so will cause our net revenue and gross profits to decline, which will harm our business and results of operations. In addition, we may experience substantial period-to-period fluctuations in future operating results due to the erosion of our average selling prices.
It is difficult to predict our future operating results because we have an unpredictable sales cycle
     Our products have a lengthy sales cycle and the timing of our revenue is difficult to predict. Historically, our sales cycle has ranged from approximately two to three months and has tended to lengthen as we have increasingly focused our sales efforts on the enterprise market. Also, as our distribution strategy has evolved into more of a channel model, utilizing value-added resellers, distributors and systems integrators, the level of variability in the length of sales cycle across transactions has increased and made it more difficult to predict the timing of many of our sales transactions. Sales of our products require us to educate potential customers in their use and benefits. Sales of our products are subject to delays from the lengthy internal budgeting, approval and competitive evaluation processes that large corporations and governmental entities may require. For example, customers frequently begin by evaluating our products on a limited basis and devote time and resources to testing our products before they decide whether or not to purchase. Customers may also defer orders as a result of anticipated releases of new products or enhancements by our competitors or us. As a result, our products have an unpredictable sales cycle that contributes to the uncertainty of our future operating results.
Our business may be harmed if our contract manufacturers are not able to provide us with adequate supplies of our products or if a single source of hardware assembly is lost or impaired
     We outsource the manufacturing of our hardware platforms to third party contract manufacturers who assemble these hardware platforms to our specifications. We have experienced minor delays in shipments from contract manufacturers in the past. However, if we experience major delays in the future or other problems, such as inferior quality and insufficient quantity of product, any one or a combination of these factors may harm our business and results of operations. The inability of our contract manufacturers to provide us with adequate supplies of our products or the loss of one or more of our contract manufacturers may cause a delay in our ability to fulfill orders while we obtain a replacement manufacturer and may harm our business and results of operations. In particular, we currently subcontract manufacturing of our application delivery networking products to a single contract manufacturer with whom we do not have a long-term contract. If our arrangement with this single source of hardware assembly was terminated or otherwise impaired, and we were not able to engage another contract manufacturer in a timely manner, our business, financial condition and results of operation could be adversely affected.
     If the demand for our products grows, we will need to increase our raw material and component purchases, contract manufacturing capacity and internal test and quality control functions. Any disruptions in product flow may limit our revenue, may harm our competitive position and may result in additional costs or cancellation of orders by our customers.

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Our business could suffer if there are any interruptions or delays in the supply of hardware components from our third-party sources
     We currently purchase several hardware components used in the assembly of our products from a number of single or limited sources. Lead times for these components vary significantly. The unavailability of suitable components, any interruption or delay in the supply of any of these hardware components or the inability to procure a similar component from alternate sources at acceptable prices within a reasonable time, may delay assembly and sales of our products and, hence, our revenues, and may harm our business and results of operations.
We are subject to governmental export and import controls that could subject us to liability or impair our ability to compete in international markets
     Our products are subject to U.S. export controls and may be exported outside the U.S. only with the required level of export license or through an export license exception because we incorporate encryption technology into our products. In addition, various countries regulate the import of certain encryption technology and have enacted laws that could limit our ability to distribute our products or our customers’ ability to implement our products in those countries. Changes in our products or changes in export and import regulations may create delays in the introduction of our products in international markets, prevent our customers with international operations from deploying our products throughout their global systems or, in some cases, prevent the export or import of our products to certain countries altogether. Any change in export or import regulations or related legislation, shift in approach to the enforcement or scope of existing regulations or change in the countries, persons or technologies targeted by such regulations, could result in decreased use of our products by, or in our decreased ability to export or sell our products to, existing or potential customers with international operations. For example, we will need to comply with Waste Electrical and Electronic Equipment Directive laws, which are being adopted by certain European Economic Area countries on a country-by-country basis. Failure to comply with these and similar laws on a timely basis, or at all, could have a material adverse effect on our business, operating results and financial condition. Any decreased use of our products or limitation on our ability to export or sell our products would likely adversely affect our business, operating results and financial condition.
We may not be able to adequately protect our intellectual property and our products may infringe on the intellectual property rights of third parties
     We rely on a combination of patent, copyright, trademark and trade secret laws, and restrictions on disclosure of confidential and proprietary information to protect our intellectual property rights. Despite our efforts to protect our proprietary rights, unauthorized parties may attempt to copy or otherwise obtain and use our products or technology. Monitoring unauthorized use of our products is difficult, and we cannot be certain that the steps we have taken will prevent misappropriation of our technology, particularly in foreign countries where the laws may not protect our proprietary rights as fully as in the United States.
     Our industry is characterized by the existence of a large number of patents and frequent claims and related litigation regarding patent and other intellectual property rights. In the ordinary course of our business, we are involved in disputes and licensing discussions with others regarding their claimed proprietary rights and cannot assure you that we will always successfully defend ourselves against such claims. We expect that infringement claims may increase as the number of products and competitors in our market increases and overlaps occur. Also, as we have gained greater visibility, market exposure and competitive success, we face a higher risk of being the subject of intellectual property infringement claims. If we are found to infringe the proprietary rights of others, or if we otherwise settle such claims, we could be compelled to pay damages or royalties and either obtain a license to those intellectual property rights or alter our products so that they no longer infringe upon such proprietary rights. Any license could be very expensive to obtain or may not be available at all. Similarly, changing our products or processes to avoid infringing upon the rights of others may be costly or impractical. In addition, we have initiated, and may in the future initiate, claims or litigation against third parties for infringement of our proprietary rights, or to determine the scope and validity of our proprietary rights or those of our competitors. Any of these claims, whether claims that we are infringing the proprietary rights of others, or vice versa, with or without merit, may be time-consuming, result in costly litigation and diversion of technical and management personnel or require us to cease using infringing technology, develop non-infringing technology or enter into royalty or licensing agreements. Further, our license agreements typically require us to indemnify our customers, distributors and resellers for infringement actions related to our technology, which could cause us to become involved in infringement claims made against our customers, distributors or resellers. Any of the above-described circumstances relating to intellectual property rights disputes could result in our business and results of operations being harmed.
     Many of our products include intellectual property licensed from third parties. In the future, it may be necessary to renew licenses for third party intellectual property or obtain new licenses for other technology. These third party licenses may not be available to us on acceptable terms, if at all. The inability to obtain certain licenses, or litigation regarding the interpretation or enforcement of license rights and related intellectual property issues, could have a material adverse effect on our business, operating results and financial

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condition. Furthermore, we license some third party intellectual property on a non-exclusive basis and this may limit our ability to protect our intellectual property rights in our products.
We may not be able to sustain or develop new distribution relationships and a reduction or delay in sales to significant distribution partners could hurt our business
     We sell our products and services through multiple distribution channels in the United States and internationally, including leading industry distributors, value-added resellers, systems integrators, service providers and other indirect channel partners. We have a limited number of agreements with companies in these channels, and we may not be able to increase our number of distribution relationships or maintain our existing relationships. Recruiting and retaining qualified channel partners and training them in our technologies requires significant time and resources. If we are unable to establish or maintain our indirect sales channels, our business and results of operations will be harmed. In addition, two worldwide distributors of our products accounted for 24.7% of our total net revenue for fiscal year 2010. One worldwide distributor of our products accounted for 15.4% of our total net revenue for fiscal year 2009. One worldwide distributor of our products accounted for 19.2% of our total net revenue for the six months ended March 31, 2011. A substantial reduction or delay in sales of our products to these distribution partners, if not replaced by sales to other indirect channel partners and distributors, could harm our business, operating results and financial condition.
Undetected software or hardware errors may harm our business and results of operations
     Our products may contain undetected errors or defects when first introduced or as new versions are released. We have experienced these errors or defects in the past in connection with new products and product upgrades. We expect that these errors or defects will be found from time to time in new or enhanced products after commencement of commercial shipments. These problems may cause us to incur significant warranty and repair costs, divert the attention of our engineering personnel from our product development efforts and cause significant customer relations problems. We may also be subject to liability claims for damages related to product errors or defects. While we carry insurance policies covering this type of liability, these policies may not provide sufficient protection should a claim be asserted. A material product liability claim may harm our business and results of operations.
     Our products must successfully operate with products from other vendors. As a result, when problems occur in a network, it may be difficult to identify the source of the problem. The occurrence of software or hardware problems, whether caused by our products or another vendor’s products, may result in the delay or loss of market acceptance of our products. The occurrence of any of these problems may harm our business and results of operations.
Adverse general economic conditions or reduced information technology spending may adversely impact our business
     A substantial portion of our business depends on the demand for information technology by large enterprise customers and service providers, the overall economic health of our current and prospective customers and the continued growth and evolution of the Internet. International, national, regional and local economic conditions, such as recessionary economic cycles, protracted economic slowdown or further deterioration of the economy could adversely impact demand for our products. The purchase of our products is often discretionary and may involve a significant commitment of capital and other resources. Continued weak economic conditions or a reduction in information technology spending even if economic conditions improve would likely result in longer sales cycles and reduced product sales, each of which would adversely impact our business, results of operations and financial condition.
Our investments in auction rate securities are subject to risks that may cause losses and affect the liquidity of these investments
     At March 31, 2011, the fair value of our AAA/A- (or equivalent) rated municipal auction rate securities (“ARS”) was approximately $16.4 million. We may not be able to liquidate these ARS and realize their full carrying value unless the issuer calls the security, a successful auction occurs, a buyer is found outside of the auction process, or the security otherwise matures. While we do not believe the decline in the carrying values of these municipal ARS is permanent, if the issuers of these securities are unable to successfully close future auctions and their credit ratings are lowered, we may be required to record future impairment charges related to these investments, which would harm our results of operations. We believe certain of these available-for-sale investments may remain illiquid for longer than twelve months and as a result, we have classified these investments as long-term as of March 31, 2011.
Our operating results are exposed to risks associated with international commerce
     As our international sales increase, our operating results become more exposed to international operating risks. These risks include risks related to recessionary economic cycles or protracted slowdowns in economies outside the United States, foreign currency exchange rates, managing foreign sales offices, regulatory, political or economic conditions in specific countries, military conflict or

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terrorist activities, changes in laws and tariffs, inadequate protection of intellectual property rights in foreign countries, foreign regulatory requirements and natural disasters. All of these factors could have a material adverse effect on our business. We intend to continue expanding into international markets. International sales represented 41.4% and 44.7% of our net revenues for the fiscal years ended September 30, 2010 and 2009, respectively, and 41.1% for the six months ended March 31, 2011.
Changes in governmental regulations could negatively affect our revenues
     Our products are subject to various regulations promulgated by the United States and various foreign governments including, but not limited to, environmental regulations and regulations implementing export license requirements and restrictions on the import or export of some technologies, especially encryption technology. Changes in governmental regulation and our inability or failure to obtain required approvals, permits or registrations could harm our international and domestic sales and adversely affect our revenues, business and operations.
Changes in financial accounting standards may cause adverse unexpected revenue fluctuations and affect our reported results of operations
     A change in accounting policies can have a significant effect on our reported results and may even affect our reporting of transactions completed before the change is effective. New pronouncements and varying interpretations of existing pronouncements have occurred with frequency and may occur in the future. Changes to existing rules, or changes to the interpretations of existing rules, could lead to changes in our accounting practices, and such changes could adversely affect our reported financial results or the way we conduct our business.
Acquisitions present many risks and we may not realize the financial and strategic goals that are contemplated at the time of the transaction
     With respect to our past acquisitions, as well as any other future acquisitions we may undertake, we may find that the acquired businesses, products or technologies do not further our business strategy as expected, that we paid more than what the assets are later worth or that economic conditions change, all of which may generate future impairment charges. Our acquisitions may be viewed negatively by customers, financial markets or investors. There may be difficulty integrating the operations and personnel of the acquired business, and we may have difficulty retaining the key personnel of the acquired business. We may have difficulty in integrating the acquired technologies or products with our existing product lines. Our ongoing business and management’s attention may be disrupted or diverted by transition or integration issues and the complexity of managing geographically and culturally diverse locations. We may have difficulty maintaining uniform standards, controls, procedures and policies across locations. We may experience significant problems or liabilities associated with product quality, technology and other matters.
     Our inability to successfully operate and integrate newly-acquired businesses appropriately, effectively and in a timely manner, or to retain key personnel of any acquired business, could have a material adverse effect on our ability to take advantage of further growth in demand for integrated traffic management and security solutions and other advances in technology, as well as on our revenues, gross margins and expenses.
Our success depends on our key personnel and our ability to attract and retain qualified sales and marketing, operations, product development and professional services personnel
     Our success depends to a significant degree upon the continued contributions of our key management, product development, sales, marketing and finance personnel, many of whom may be difficult to replace. The complexity of our application delivery networking products and their integration into existing networks and ongoing support, as well as the sophistication of our sales and marketing effort, requires us to retain highly trained professional services, customer support and sales personnel. Competition for qualified professional services, customer support and sales personnel in our industry is intense because of the limited number of people available with the necessary technical skills and understanding of our products. Our ability to retain and hire these personnel may be adversely affected by volatility or reductions in the price of our common stock, since these employees are generally granted restricted stock units. The loss of services of any of our key personnel, the inability to retain and attract qualified personnel in the future or delays in hiring qualified personnel may harm our business and results of operations.

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We face litigation risks
     We are a party to lawsuits in the normal course of our business. Litigation in general, and intellectual property and securities litigation in particular, can be expensive, lengthy and disruptive to normal business operations. Moreover, the results of complex legal proceedings are difficult to predict. Responding to lawsuits has been, and will likely continue to be, expensive and time-consuming for us. An unfavorable resolution of these lawsuits could adversely affect our business, results of operations or financial condition.
Anti-takeover provisions could make it more difficult for a third party to acquire us
     Our Board of Directors has the authority to issue up to 10,000,000 shares of preferred stock and to determine the price, rights, preferences, privileges and restrictions, including voting rights, of those shares without any further vote or action by the shareholders. The rights of the holders of common stock may be subject to, and may be adversely affected by, the rights of the holders of any preferred stock that may be issued in the future. The issuance of preferred stock may have the effect of delaying, deferring or preventing a change of control of our company without further action by our shareholders and may adversely affect the voting and other rights of the holders of common stock. Further, certain provisions of our bylaws, including a provision limiting the ability of shareholders to raise matters at a meeting of shareholders without giving advance notice, may have the effect of delaying or preventing changes in control or management of our company, which could have an adverse effect on the market price of our common stock. In addition, our articles of incorporation provide for a staggered board, which may make it more difficult for a third party to gain control of our Board of Directors. Similarly, state anti-takeover laws in the State of Washington related to corporate takeovers may prevent or delay a change of control of our company.
Item 3. Quantitative and Qualitative Disclosures About Market Risk
     At March 31, 2011, the fair value of our AAA/A- (or equivalent) rated municipal ARS was approximately $16.4 million. ARS are collateralized long-term debt instruments that provide liquidity through a Dutch auction process that resets the applicable interest rate at pre-determined intervals, typically every 7, 28 or 35 days. Beginning in February 2008, auctions failed for approximately $53.4 million in par value of municipal ARS we held because sell orders exceeded buy orders. When these auctions failed to clear, higher interest rates for those securities went into effect. However, the funds associated with these failed auctions will not be accessible until the issuer calls the security, a successful auction occurs, a buyer is found outside of the auction process, or the security matures. The underlying assets of the municipal ARS we hold, including the securities for which auctions have failed, are generally student loans which are guaranteed by the U.S. government. Based on our expected operating cash flows and our other sources of cash, we do not believe that any reduction in liquidity of our municipal ARS will have a material impact on our overall ability to meet our liquidity needs. We have no intent to sell, won’t be required to sell, and believe we will hold these securities until recovery. We believe certain of these available-for-sale investments may remain illiquid for longer than twelve months and as a result, we have classified $19.0 million (par value) of securities as long-term as of March 31, 2011.
     Management believes there have been no other material changes to our quantitative and qualitative disclosures about market risk during the six month period ended March 31, 2011, compared to those discussed in our Annual Report on Form 10-K for the year ended September 30, 2010.
Item 4. Controls and Procedures
     Our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) are designed to ensure that required information is properly recorded, processed, summarized and reported within the required timeframe, as specified in the rules set forth by the SEC. Our disclosure controls and procedures are also designed to ensure that information required to be disclosed is accumulated and communicated to management, including our Chief Executive Officer and Chief Accounting Officer, to allow timely decisions regarding required disclosures.
     Our management, with the participation of our Chief Executive Officer and Chief Accounting Officer, evaluated the effectiveness of our disclosure controls and procedures as of March 31, 2011. Based upon that evaluation, our Chief Executive Officer and Chief Accounting Officer have concluded that our disclosure controls and procedures were effective as of March 31, 2011.
     There were no changes in our internal control over financial reporting (as defined in Rules 13a-15(f) or 15d-15(f) of the Exchange Act) during the period covered by this quarterly report that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II — OTHER INFORMATION
Item 1. Legal Proceedings
     We are not aware of any additional pending legal proceedings that, individually or in the aggregate, would have a material adverse effect on our business, operating results, or financial condition. We may in the future be party to litigation arising in the ordinary course of business, including claims that we allegedly infringe upon third-party intellectual property rights. Such claims, even if not meritorious, could result in the expenditure of significant financial and managerial resources.
     Reference is made to Item 1, Note 5, “Commitments and Contingencies — Legal Proceedings,” of Part I of this Quarterly Report on Form 10-Q and Item 3, Legal Proceedings, in the Form 10-K, filed November 23, 2010 for descriptions of our legal proceedings. We continue to believe that the resolution of these legal proceedings will not have a material adverse effect on us and there have been no material developments since the time of the Form 10-K filing, except as noted in Item 1, Note 5 of Part I of this Quarterly Report on Form 10-Q.
Item 1A. Risk Factors
     Information regarding risk factors appears in Part I — Item 2 of this Quarterly Report on Form 10-Q, “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Risk Factors that May Affect Future Results.” This information includes previously disclosed material changes to the risk factors set forth in Part I — Item 1A of the Form 10-K.
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds
     On October 22, 2008, we announced that our Board of Directors approved a program to repurchase up to an additional $200 million of our outstanding common stock. As of September 30, 2010, we had $37.6 million remaining to purchase shares as part of this repurchase program. On October 26, 2010, we announced that our Board of Directors approved a new program to repurchase up to an additional $200 million of our outstanding common stock. Acquisitions for the share repurchase programs will be made from time to time in private transactions or open market purchases as permitted by securities laws and other legal requirements. The programs may be discontinued at any time. As of May 3, 2011 we had repurchased and retired 5,134,929 shares at an average price of $45.51 per share and we had $166.0 million remaining to purchase shares as part of our repurchase programs.
     Shares repurchased and retired as of May 3, 2011 are as follows (in thousands, except shares and per share data):
                                 
                            Approximate Dollar  
                    Total Number of     Value of Shares  
    Total Number             Shares Purchased     that May Yet be  
    of Shares     Average Price     per the Publicly     Purchased  
    Purchased     Paid per Share     Announced Plan     Under the Plan  
October 1, 2010 — October 31, 2010
        $           $ 237,564  
November 1, 2010 — November 30, 2010
    126,125     $ 120.30       126,125     $ 222,384  
December 1, 2010 — December 31, 2010
    71,519     $ 137.24       71,519     $ 212,565  
 
                               
January 1, 2011 — January 31, 2011
    43,200     $ 106.71       43,200     $ 207,953  
February 1, 2011 — February 28, 2011
    203,785     $ 118.36       203,785     $ 183,823  
March 1, 2011 — March 31, 2011
    157,948     $ 112.55       157,948     $ 166,038  
 
                               
April 1, 2011 — April 30, 2011
        $           $ 166,038  
May 1, 2011 — May 3, 2011
        $           $ 166,038  

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Item 6. Exhibits
         
Exhibit        
Number       Exhibit Description
31.1*
    Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
 
       
31.2*
    Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
 
       
32.1*
    Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
 
       
101.INS**
    XBRL Instance Document
 
       
101.SCH**
    XBRL Taxonomy Extension Schema Document
 
       
101.CAL**
    XBRL Taxonomy Extension Calculation Linkbase Document
 
       
101.DEF**
    XBRL Taxonomy Extension Definition Linkbase Document
 
       
101.LAB**
    XBRL Taxonomy Extension Label Linkbase Document
 
       
101.PRE**
    XBRL Taxonomy Extension Presentation Linkbase Document
 
*   Filed herewith.
 
**   XBRL (Extensible Business Reporting Language) information is furnished and not filed herewith, is not a part of a registration statement or Prospectus for purposes of sections 11 or 12 of the Securities Act of 1933, is deemed not filed for purposes of section 18 of the Securities Exchange Act of 1934, and otherwise is not subject to liability under these sections.

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SIGNATURES
     Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized on this 6th day of May, 2011.
         
  F5 NETWORKS, INC.
 
 
  By:   /s/ JOHN RODRIGUEZ    
    John Rodriguez   
    Senior Vice President,
Chief Accounting Officer
(principal financial officer) 
 

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EXHIBIT INDEX
         
Exhibit        
Number       Exhibit Description
31.1*
    Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
 
       
31.2*
    Certification Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
 
       
32.1*
    Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
 
       
101.INS**
    XBRL Instance Document
 
       
101.SCH**
    XBRL Taxonomy Extension Schema Document
 
       
101.CAL**
    XBRL Taxonomy Extension Calculation Linkbase Document
 
       
101.DEF**
    XBRL Taxonomy Extension Definition Linkbase Document
 
       
101.LAB**
    XBRL Taxonomy Extension Label Linkbase Document
 
       
101.PRE**
    XBRL Taxonomy Extension Presentation Linkbase Document
 
*   Filed herewith.
 
**   XBRL (Extensible Business Reporting Language) information is furnished and not filed herewith, is not a part of a registration statement or Prospectus for purposes of sections 11 or 12 of the Securities Act of 1933, is deemed not filed for purposes of section 18 of the Securities Exchange Act of 1934, and otherwise is not subject to liability under these sections.

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