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): May 29, 2013

COMPASS DIVERSIFIED HOLDINGS

(Exact name of registrant as specified in its charter)

COMPASS GROUP DIVERSIFIED

HOLDINGS LLC

(Exact name of registrant as specified in its charter)

Sixty One Wilton Road

Second Floor

Westport, CT 06880

(Address of principal executive offices and zip code)

Registrant’s telephone number, including area code: (203) 221-1703

Check the appropriate box below if the Form 8-K is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

On May 29, 2013, Compass Diversified Holdings (the “Trust”) and Compass Group Diversified Holdings LLC (the “Company”) (NYSE: CODI) (collectively “CODI”) held their 2013 Annual Meeting of Shareholders (the “Annual Meeting”), at the Delamar Southport, 275 Old Post Road, Southport, Connecticut 06890. A total of 48,300,000 shares of the Company’s common stock were entitled to vote as of April 11, 2013, the record date for the Annual Meeting. There were 41,771,490 shares present in person or by proxy, constituting a quorum, at the Annual Meeting, at which the shareholders were asked to vote on three (3) proposals. Set forth below are the matters acted upon by the shareholders and the final voting results of each such proposal.

Proposal 1. Election of Directors

With respect to the election of the following nominees as Class I directors of the Company to hold office for a three-year term, ending at the 2016 Annual Meeting, the shareholders voted as set forth in the table below:

Based on the votes set forth above, Messrs. Edwards and Lazarus were duly elected to serve as Class I directors of the Company for a three-year term, ending at the 2016 Annual Meeting.

Proposal 2. Advisory Vote Regarding Executive Compensation (“Say-on-Pay”)

With respect to the non-binding, advisory vote to approve the compensation of the Company’s named executive officers as disclosed in the Company’s Proxy Statement, the shareholders voted as set forth in the table below:

Based on the votes set forth above, the shareholders approved the Say-on-Pay proposal.

Proposal 3. Ratification of Selection of Independent Auditor

The ratification of the appointment of Grant Thornton LLP as independent auditor for the Company and the Trust for the fiscal year ending December 31, 2013 received the following votes:

Based on the votes set forth above, the ratification of the appointment of Grant Thornton LLP as the independent auditor for the Company and the Trust to serve for the 2013 fiscal year was duly ratified by the shareholders.

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.

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.