FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

First Reserve Sustainable Growth Sponsor LLC
2. Issuer Name and Ticker or Trading Symbol

First Reserve Sustainable Growth Corp. [ FRSG ]
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                    __X__ 10% Owner
_____ Officer (give title below)    _____ Other (specify below)
(Last)          (First)          (Middle)

FIRST RESERVE SUSTAINABLE GROWTH CORP., 290 HARBOR DRIVE, FIFTH FLOOR
3. Date of Earliest Transaction (MM/DD/YYYY)

4/19/2021
(Street)

STAMFORD, CT 06902
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
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. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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 Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security3. Trans. Date3A. Deemed Execution Date, if any4. Trans. Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
6. Date Exercisable and Expiration Date7. 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 of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Class B Common Stock  (1)4/19/2021  J (2)    189011   (1) (1)Class A Common Stock 189011  (2)5560989 D  

Explanation of Responses:
(1) The shares of Class B Common Stock are convertible into shares of the Issuer's Class A Common Stock on a one-for-one basis, subject to adjustment pursuant to certain anti-dilution rights, and have no expiration date.
(2) The Class B Common Stock owned by First Reserve Sustainable Growth Sponsor LLC included up to 750,000 shares that were subject to forfeiture in the event the underwriters of the initial public offering of the Issuer's securities did not exercise in full their over-allotment option as described in the Issuer's Registration Statement on Form S-1 (File No. 333-252717). Because the underwriters exercised their over-allotment option in part, First Reserve Sustainable Growth Sponsor LLC forfeited 189,011 shares of Class B Common Stock on April 19, 2021 for cancellation by the Issuer.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
First Reserve Sustainable Growth Sponsor LLC
FIRST RESERVE SUSTAINABLE GROWTH CORP.
290 HARBOR DRIVE, FIFTH FLOOR
STAMFORD, CT 06902

X


Signatures
/s/ Neil A. Wizel, as Attorney-in-Fact for First Reserve Sustainable Growth Sponsor LLC4/19/2021
**Signature of Reporting PersonDate

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