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): October 25, 2013

Symmetricom, Inc.

(Exact Name of Registrant as Specified in its Charter)

Registrant’s Telephone Number, Including Area Code (408) 433-0910

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):

At the 2013 Annual Meeting of Stockholders (the “Annual Meeting”) of Symmetricom, Inc. (“Symmetricom”) held on October 25, 2013, the stockholders of Symmetricom approved the amendment and restatement of Symmetricom’s Amended and Restated 2006 Incentive Award Plan, as previously amended, to increase the number of shares of common stock authorized for issuance thereunder by 1,500,000 shares. A description of the Amended and Restated Symmetricom, Inc. 2006 Incentive Award Plan (the “Amended and Restated Plan”) is set forth in the Proxy Statement for the Annual Meeting under the heading “Proposal No. Four — Approval of the Amendment and Restatement of the Amended and Restated 2006 Incentive Award Plan” beginning on page 14, and the full text of the Amended and Restated Plan can be found attached as Appendix A to the Proxy Statement, each of which is incorporated by reference herein.

Set forth below are the matters that were voted on by the stockholders at the Annual Meeting and the final voting results.

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.