Exhibit 99.01

Imperva Announces Second Quarter 2012 Financial Results

Redwood Shores, Calif. – August 9, 2012 – Imperva, Inc. (NYSE: IMPV), a pioneer and leader of a new category of business security solutions for critical applications and high-value data in the data center, today announced financial results for the second quarter ended June 30, 2012.

“We are very pleased with our strong execution during the quarter and ability to achieve strong results across all of our key operating metrics,” stated Shlomo Kramer, President and Chief Executive Officer of Imperva. “Our performance was driven by the combination of continued demand for our integrated solution and strong growth of subscriptions. We also had solid growth across all geographic regions and continued to make progress on leveraging the investments made in our global sales and research and development infrastructure. Imperva remains well positioned to maintain its momentum during the second half of the year due to a healthy pipeline of business and expanding product line.”

Second Quarter 2012 Financial Highlights

Non–GAAP net loss attributable to Imperva stockholders for the second quarter of 2012 was $0.4 million, or $0.02 per share based on 22.6 million weighted average diluted shares outstanding, excluding the above mentioned charges. This compares to non-GAAP net loss attributable to Imperva stockholders of $2.6 million, or $0.16 per share based on 16.2 million weighted average diluted shares outstanding in the prior year period.

Both GAAP and non-GAAP loss per share attributable to Imperva stockholders for the second quarter ended June 30, 2012 adjust for the loss attributable to Imperva’s non controlling interest in Incapsula. A reconciliation of GAAP to non-GAAP financial measures has been provided in the financial statement tables included in this press release. An explanation of these measures is also included below under the heading “Non-GAAP Financial Measures.”

Second Quarter 2012 Operating Highlights

Business Outlook

The following forward-looking statements reflect expectations as of August 9, 2012. Results may be materially different and could be affected by the factors detailed in this press release and in recent Imperva SEC filings.

Third Quarter Expectations – Ending September 30, 2012

Imperva expects total revenue for the third quarter of 2012 to be in the range of $24.6 million to $25.0 million, representing growth in the range of 25% to 27% compared to the same period in 2011. The company expects in the third quarter of 2012 non-GAAP gross margins of approximately 79%. Further, Imperva expects in the third quarter of 2012 non-GAAP operating loss to be in the range of $0.5 million to $0.9 million and non-GAAP net loss attributable to Imperva stockholders to be in the range of $0.4 million to $0.8 million, or a loss of $0.02 to $0.03 per share, which excludes stock-based compensation expense.

Full Year Expectations –Ending December 31, 2012

Imperva expects total revenue for 2012 to be in the range of $99.5 million to $101.5 million, or up 27% to 30% compared to 2011. Imperva expects 2012 non-GAAP gross margins of approximately 79%. Further, the company expects 2012 non-GAAP operating loss to be in the range of $2.7 million to $3.1 million and non-GAAP net loss attributable to Imperva stockholders to be in the range of $2.3 million to $2.7 million, or a loss of $0.11 to $0.13, which excludes stock-based compensation expense. Imperva expects capital expenditures for the full year to be in the range of $2.0 million to $2.5 million. Finally, the company expects to generate positive cash flows from operations in 2012.

Quarterly Conference Call

Imperva will host a conference call today at 2:00 p.m. Pacific Time (5:00 p.m. Eastern Time) to review the company’s financial results for the second quarter ended June 30, 2012. To access this call, dial 800.500.3170 for the U.S. and Canada or 719.325.2154 for international callers with conference ID #4381436. A live webcast of the conference call will be accessible from the investors page of Imperva’s website at www.imperva.com, and a recording will be archived and accessible at www.imperva.com. An audio replay of this conference call will also be available through August 23, 2012, by dialing 877.870.5176 for the U.S. and Canada, or 858.384.5517 for international callers and entering passcode 4381436.

Non-GAAP Financial Measures

Imperva reports all financial information required in accordance with U.S. generally accepted accounting principles (GAAP). To supplement the Imperva unaudited condensed consolidated financial statements presented in accordance with GAAP, Imperva uses certain non-GAAP measures of financial performance. The presentation of these non-GAAP financial measures is not intended to be considered in isolation from, as a substitute for, or superior to, the financial information prepared and presented in accordance with GAAP, and may be different from non-GAAP financial measures used by other companies. In addition, these non-GAAP measures have limitations in that they do not reflect all of the amounts associated with the results of Imperva operations as determined in accordance with GAAP. The non-GAAP financial measures used by Imperva include historical non-GAAP net loss and non-GAAP basic and diluted loss per share. These non-GAAP financial measures exclude stock-based compensation from the Imperva

unaudited condensed consolidated statement of operations and give pro forma effect to the conversion of convertible preferred stock and issuance of common stock in connection with Imperva’s initial public offering as if both had happened at the beginning of each period presented.

For a description of these items, including the reasons why management adjusts for them, and reconciliations of these non-GAAP financial measures to the most directly comparable GAAP financial measures, please see the section of the accompanying tables titled “Use of Non-GAAP Financial Information” as well as the related tables that precede it. Imperva may consider whether other significant non-recurring items that arise in the future should also be excluded in calculating the non-GAAP financial measures it uses.

Imperva believes that these non-GAAP financial measures, when taken together with the corresponding GAAP financial measures, provide meaningful supplemental information regarding the performance of Imperva by excluding certain items that may not be indicative of the company’s core business, operating results or future outlook. Imperva management uses, and believes that investors benefit from referring to, these non-GAAP financial measures in assessing operating results of Imperva, as well as when planning, forecasting and analyzing future periods. These non-GAAP financial measures also facilitate comparisons of the performance of Imperva to prior periods.

Forward Looking Statements

This press release contains forward-looking statements, including without limitation those regarding Imperva’s “Business Outlook” (“Third Quarter Expectations – Ending September 30, 2012” and “Full Year Expectations – Ending December 31, 2012”); Imperva’s belief that it is well positioned to maintain its momentum during the second half of the year, its belief that it has a healthy pipeline of business, and its expectations regarding the impact of its expanding product line on revenue growth. These forward-looking statements are subject to material risks and uncertainties that may cause actual results to differ substantially from expectations. Investors should consider important risk factors, which include: the risk that demand for our business security solutions may not increase and may decrease; the risk that we may not timely introduce new products or versions of our products and that they may not be accepted by the market; the risk that competitors may be perceived by customers to be better positioned to help handle business security threats and protect their businesses from major risk; the risk that the growth of Imperva may be lower than anticipated; and other risks detailed under the caption “Risk Factors” in the company’s Form 10-Q filed with the Securities and Exchange Commission, or the SEC, on May 11, 2012 and the company’s other SEC filings. You can obtain copies of the company’s SEC filings on the SEC’s website at www.sec.gov.

The foregoing information represents the company’s outlook only as of the date of this press release, and Imperva undertakes no obligation to update or revise any forward-looking statements, whether as a result of new information, new developments or otherwise.

About Imperva

Imperva is a pioneer and leader of a new category of business security solutions for critical applications and high-value data in the data center. Imperva’s award-winning solutions protect against data theft, insider abuse, and fraud while streamlining regulatory compliance by

monitoring and controlling data usage and business transactions across the data center, from storage in a database or on a file server to consumption through applications. With over 1,900 end-user customers in more than 60 countries and thousands of organizations protected through cloud-based deployments, securing your business with Imperva puts you in the company of the world’s leading organizations. For more information, visit www.imperva.com, follow us on Twitter or visit our blog.

^© 2012 Imperva, Inc. All rights reserved. Imperva, the Imperva logo and SecureSphere are trademarks of Imperva, Inc.

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IMPERVA, INC. AND SUBSIDIARIES

Condensed Consolidated Statements of Operations

(On a GAAP basis)

(In thousands, except per share amounts)

(Unaudited)

IMPERVA, INC. AND SUBSIDIARIES

Condensed Consolidated Balance Sheets

(In thousands)

(Unaudited)

IMPERVA, INC. AND SUBSIDIARIES

Condensed Consolidated Statements of Cash Flows

(In thousands)

(Unaudited)

IMPERVA, INC. AND SUBSIDIARIES

(Reconciliation of GAAP to Non-GAAP Measures)

(In thousands, except per share amounts)

(Unaudited)

- Due to rounding, totals may not equal the sum of the line items in the table above.

Use of Non-GAAP Financial Information

In addition to the reasons stated above, which are generally applicable to each of the items Imperva excludes from its non-GAAP financial measures, Imperva believes it is appropriate to exclude or give effect to certain items for the following reasons:

Stock-Based Compensation: When evaluating the performance of its consolidated results, Imperva does not consider stock-based compensation charges. Likewise, the Imperva management team excludes stock-based compensation expense from its operating plans. In contrast, the Imperva management team is held accountable for cash-based compensation and such amounts are included in its operating plans. Further, when considering the impact of equity award grants, Imperva places a greater emphasis on overall stockholder dilution rather than the accounting charges associated with such grants.

Imperva believes it is useful to provide a non-GAAP financial measure that excludes stock-based compensation in order to better understand the long-term performance of its business.

Conversion of Preferred and Shares from Initial Public Offering: Imperva believes it is useful to provide a non-GAAP financial measure that gives pro forma effect to the conversion of preferred stock and issuance of common stock in connection with Imperva’s initial public offering as if both had happened at the beginning of each period presented in order to have an alternative way to evaluate per share performance on a comparative basis.

Investor Relations Contact Information

Seth Potter

646.277.1230

IR@imperva.com

Seth.Potter@icrinc.com