8-K

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 eventreported): May 19, 2022

CLEAN ENERGY FUELS CORP.

(Exact Name of Registrant as Specified in Charter)

(949) 437-1000

(Registrant’s telephone number, includingarea code)

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):

Securities registered pursuant to Section 12(b) of the Act:

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 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

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.   ¨

On May 19, 2022, Clean Energy Fuels Corp. (the “Company”) held its 2022 annual meeting of stockholders (the “Annual Meeting”). The Company’s stockholders considered and voted on four proposals at the Annual Meeting and cast their votes on each such proposal as set forth below.

Proposal1: The holders of the Company’s common stock elected ten director nominees to the Company’s Board of Directors, each to serve for a one-year term until the Company’s next annual meeting of stockholders and until his or her respective successor is duly elected and qualified or until his or her earlier resignation or removal. The results of the voting on Proposal 1 were as follows:

Proposal 2: The holders of the Company’s common stock ratified the appointment of KPMG LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2022. The results of the voting on Proposal 2 were as follows:

Proposal 3: The holders of the Company’s common stock approved, on an advisory, non-binding basis, the compensation of the Company’s named executive officers. The results of the voting on Proposal 3 were as follows:

Proposal 4: The holders of the Company’s common stock approved the Company’s 2022 Employee Stock Purchase Plan (the “New ESPP”) and the reservation of 2,500,00 shares of the Company’s common stock for issuance under the New ESPP. The results of the voting on Proposal 4 were as follows:

2

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

3