Form: 4

Statement of changes in beneficial ownership of securities

May 1, 2013

SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP


Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
CHESAPEAKE ENERGY CORP

(Last) (First) (Middle)
6100 N. WESTERN AVENUE

(Street)
OKLAHOMA CITY OK 73118

(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
Clean Energy Fuels Corp. [ CLNE ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director X 10% Owner
Officer (give title below) Other (specify below)
3. Date of Earliest Transaction (Month/Day/Year)
04/29/2013
4. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
7.5% Convertible Promissory Note $15.8 04/29/2013(1) P 1 (2) (3) Common Stock 3,164,556 $50,000,000 3 D
Explanation of Responses:
1. On July 11, 2011, Chesapeake NG Ventures Corporation ("Chesapeake"), an indirect wholly owned subsidiary of Chesapeake Energy Corporation, entered into a Loan Agreement (the "Agreement") with Clean Energy Fuels Corp. (the "Company"), whereby Chesapeake agreed to purchase from the Company up to $150 million aggregate principal amount of debt securities pursuant to the issuance of three convertible promissory notes. Chesapeake has agreed to purchase the third $50,000,000 principal amount convertible promissory note on June 28, 2013 (the "Note").
2. The Note will be convertible into Common Stock of the Company ("Common Stock") at Chesapeake's option upon issuance and, therefore, Chesapeake is deemed to beneficially own the underlying Common Stock as of April 29, 2013.
3. Subject to certain restrictions the Company can force conversion of the Note into Common Stock if, following the second anniversary of the issuance of the Note, the Common Stock shares trade at a 40% premium to the conversion price, as defined in the Agreement, for at least twenty trading days in any consecutive thirty trading day period. The entire principal balance of the Note is due and payable seven years following its issuance, and the Company may repay the Note in Common Stock or cash.
Jennifer M. Grigsby, Sr. Vice President - Treasurer and Corporate Secretary 05/01/2013
** Signature of Reporting Person Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

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