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): June 7, 2012

Symantec Corporation

(Exact Name of Registrant as Specified in Charter)

Registrant’s Telephone Number, Including Area Code (650) 527-8000

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 1.01 Entry into a Material Definitive Agreement

On June 7, 2012, Symantec Corporation (the “Company”) entered into the First Amendment to Credit Agreement with Wells Fargo Bank, National Association (“Wells Fargo”), and the lenders party thereto (the “First Amendment”). The First Amendment amends the Credit Agreement, dated as of September 8, 2010 (the “Credit Agreement”), by and among the Company, the lenders party thereto and Wells Fargo, as administrative agent, in the following material respects:

In the ordinary course of their respective businesses, certain of the lenders party and the other parties to the Credit Agreement, as amended by the First Amendment, and their respective affiliates have engaged, and may in the future engage, in commercial banking, investment banking, financial advisory or other services with the Company and its affiliates for which they have in the past and/or may in the future receive customary compensation and expense reimbursement. Further, Citibank, N.A. and Bank of America, N.A., each a Lender, are party to certain convertible note hedge transactions and warrant transactions with the Company.

The description of the First Amendment contained herein is qualified in its entirety by reference to the First Amendment, a copy of which is filed herewith as Exhibit 10.1 and is incorporated herein by reference.

Item 2.03. Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

The information set forth under Item 1.01 is incorporated here by reference.

Item 8.01. Other Events.

This Current Report on Form 8-K is also being filed for the purpose of updating the description of the risks associated with the business, financial condition, and results of operations of the Company set forth in Part I, Item 1A, of the Company’s Annual Report on Form 10-K for the fiscal year ended March 30, 2012 (the “Annual Report”) and filing Exhibit 12.01 as an exhibit to the Company’s Registration Statement on Form S-3 (No. 333-169330).

The Company has updated its disclosure regarding the risks associated with the Company’s business, financial condition, and results of operations. The revised description of these “risk factors” is filed herewith as Exhibit 99.01 and incorporated herein by reference. The descriptions contained in Exhibit 99.01 include any material changes to and supersede the description of the risks associated with the Company’s business, financial condition, and results of operations previously disclosed in “Part I, Item 1A. Risk Factors” of the Annual Report.

The Company’s computation of the ratio of earnings to fixed charges for each of the five fiscal years in the five-year period ended March 30, 2012 is filed as Exhibit 12.01 to this Current Report on Form 8-K.

Item 9.01. Financial Statements and Exhibits.

SIGNATURE

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 hereunto duly authorized.

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