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 17, 2013

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:

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

CMS ENERGY CORPORATION

At the CMS Energy Corporation (“CMS Energy”) annual meeting of shareholders held on May 17, 2013, the CMS Energy shareholders voted upon three proposals as described in the CMS Energy Proxy Statement dated April 5, 2013. The results of the shareholder votes are as follows:

Number of Votes:

Number of Votes:

Number of Votes:

CONSUMERS ENERGY COMPANY

Consumers Energy Company (“Consumers Energy”) did not solicit proxies for the matters submitted to votes at the contemporaneous May 17, 2013 Consumers Energy annual meeting of shareholders. All 84,108,789 shares of Consumers Energy common stock held by CMS Energy were voted in favor of electing the above-named individuals as directors of Consumers Energy and in favor of the ratification of the appointment of PricewaterhouseCoopers LLP as the independent registered public accounting firm to audit Consumers Energy’s financial statements for the year ending December 31, 2013. None of the 441,599 shares of Consumers Energy preferred stock were voted at the annual meeting.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrants have duly caused this report to be signed on their behalf by the undersigned hereunto duly authorized.