Table of Contents Commission Registrant; State of Incorporation; IRS Employer File Number Address; and Telephone Number Identification No. 1‑9513 CMS ENERGY CORPORATION 38‑2726431 (A Michigan Corporation) One Energy Plaza, Jackson, Michigan 49201 (517) 788‑0550 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10‑Q x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2019 OR o TRANSITION REPORT PURSUANT ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from_____to_____ | --- | --- | --- | |------------------------------|-----------------------------------------------------------------------------------|-------- ...