UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(D) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of Earliest Event Reported): February 2, 2012

SuccessFactors, Inc.

(Exact Name of the Registrant as Specified in Its Charter)

Delaware

(State or Other Jurisdiction of Incorporation)

(650) 645-2000

(Registrant’s Telephone Number, Including Area Code)

(Former Name or Former Address, If Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Item 2.02. Preliminary Results of Operations and Financial Condition

On February 2, 2012, SuccessFactors, Inc. issued a press release announcing its preliminary results for the quarter ended December 31, 2011. A copy of the press release is attached as Exhibit 99.1 to this current report on Form 8-K and is incorporated by reference herein.

The information in this current report on Form 8-K and the exhibits attached hereto shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such filing.

Use of Non-GAAP Financial Information

SuccessFactors provides quarterly and annual financial statements that are prepared in accordance with generally accepted accounting principles (GAAP). To help understand SuccessFactors’ past financial performance and future results, SuccessFactors has supplemented its financial results that it provides in accordance with GAAP, with non-GAAP financial measures. The method SuccessFactors uses to produce non-GAAP financial results is not computed according to GAAP and may differ from the methods used by other companies. The non-GAAP measures used by SuccessFactors in this press release include non-GAAP revenue, billings, billings profit, billings margin, non-GAAP operating income and non-GAAP net loss per share. Non-GAAP operating income and non-GAAP loss per share exclude the impact of stock-based compensation expense, the amortization of intangible assets, integration costs, future cash consideration of acquisitions and deal related costs, revaluation of contingent consideration or write-downs for fair value accounting related to business combination, any unrealized foreign exchange gain/loss on an intercompany loan related to the acquisition of Inform, and a tax benefit related to the acquisition of Jobs2web. The Company defines billings as revenue plus change in total deferred revenue. Non-GAAP revenue includes the net impact of acquisition related deferred revenue that is required to be adjusted to fair value for GAAP purposes under purchase accounting rules. SuccessFactors’ reference to these non-GAAP financial results should be considered in addition to results that are prepared under current accounting standards but should not be considered as a substitute for, or superior to, the financial results that are presented as consistent with GAAP. SuccessFactors’ management believes each of these supplemental non-GAAP financial measures is useful to investors because these supplemental non-GAAP financial measures are used internally by management to understand, manage and evaluate SuccessFactors’ business and make operating decisions. These non-GAAP financial measures are among the factors SuccessFactors’ management uses in planning for and forecasting future periods. Reconciliation to the nearest GAAP financial measures of the non-GAAP financial measures is included in the press release attached hereto as Exhibit 99.1.

Item  9.01. Financial Statements and Exhibits

(d) Exhibits

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.

EXHIBIT INDEX