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): August 20, 2015

QLOGIC CORPORATION

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (949) 389-6000

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 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

(e) Compensatory Arrangements of Certain Officers

As reported below in Item 5.07, on August 20, 2015, QLogic Corporation (“QLogic”) held its annual meeting of stockholders, at which QLogic’s stockholders approved an amendment to the QLogic Corporation 1998 Employee Stock Purchase Plan (the “ESPP”) to increase the number of shares of QLogic’s common stock available for issuance under the ESPP by an additional 4,000,000 shares. The amendment to the ESPP (i) was approved by QLogic’s Board of Directors (the “Board”) on May 28, 2015, subject to approval by QLogic’s stockholders at QLogic’s 2015 annual meeting of stockholders, and (ii) became effective with such stockholder approval on August 20, 2015. QLogic’s executive officers are eligible to participate in the ESPP.

A copy of the ESPP is filed as Exhibit 10.1 hereto and incorporated herein by reference.

Item 5.07 Submission of Matters to a Vote of Security Holders.

QLogic held its annual meeting of stockholders (the “Annual Meeting”) on August 20, 2015 in Aliso Viejo, California. At the Annual Meeting, QLogic’s stockholders voted upon the following four proposals and cast their votes as described below.

Proposal 1

QLogic’s stockholders elected the eight individuals listed below to the Board, to serve on the Board until the next annual meeting of stockholders and/or until their successors are duly elected and qualified. Each nominee received affirmative votes from more than a majority of the votes cast.

Proposal 2

Proposal 2 was to approve an amendment to the QLogic Corporation 1998 Employee Stock Purchase Plan, as amended, as described in Item 5.02 above. This proposal was approved.

Proposal 3

Proposal 3 was an advisory vote to approve executive compensation, as described in the proxy materials. This proposal was approved.

Proposal 4

Proposal 4 was the ratification of the appointment of KPMG LLP as QLogic’s independent registered public accounting firm for the fiscal year ending April 3, 2016, as described in the proxy materials. This proposal was approved.

Item 9.01 Financial Statements and 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 hereunto duly authorized.