UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K/A

(Amendment No. 1)

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): February 26, 2018 (March 2, 2017)

CENTERPOINT ENERGY, INC.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (713) 207-1111

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):

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2).

Emerging Growth Company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

Explanatory Note

This Current Report on Form 8-K/A (Amendment No. 1) amends and supplements the Current Report on Form 8-K filed by CenterPoint Energy, Inc. on March 28, 2017.

8.01.        Other Events.

On February 26, 2018, Scott M. Prochazka, President and Chief Executive Officer of CenterPoint Energy, Inc. (“CenterPoint Energy”), amended an existing pre-arranged trading plan (the “Amended Plan”), which was initially adopted in March 2017 to sell a limited amount of shares of CenterPoint Energy common stock over an extended period of time for personal financial management purposes. The Amended Plan provides for an increase in the amount of shares of CenterPoint Energy common stock that may be sold under the Amended Plan.

The transactions under the plan will be disclosed publicly through Form 144 and Form 4 filings with the Securities and Exchange Commission. The plan was adopted in accordance with guidelines specified under Rule 10b5-1 of the Securities Exchange Act of 1934, as amended, and CenterPoint Energy’s policies regarding stock transactions.

Rule 10b5-1 permits the adoption of a written plan for selling stock at times when insiders are not in possession of material nonpublic information, and allows them to sell stock on a regular basis and in a non-discretionary manner, regardless of any subsequent material nonpublic information they receive after adoption of the plan.

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.