STPK Star Peak Energy Transition Corp

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 * MORGAN MICHAEL C	2. Issuer Name and Ticker or Trading Symbol Star Peak Energy Transition Corp. [ STPK ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director                    __X__ 10% Owner _____ Officer (give title below)    _____ Other (specify below)
(Last)          (First)          (Middle) C/O STAR PEAK SPONSOR LLC, 1603 ORRINGTON AVENUE, 13TH FLOOR	3. Date of Earliest Transaction (MM/DD/YYYY) 4/28/2021
(Street) EVANSTON, IL 60201 (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
Common Stock	4/28/2021		M(1)(2)		9509626	A	$0 (1)(2)	9509626	I (3)	By Star Peak Sponsor LLC
Common Stock	4/28/2021		P(3)		50000	A	$10 (3)	9559626	I	By Portcullis Partners, LP

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 Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. 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 Date		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 of Derivative Security: 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
Class B Common Stock	(1)(2)	4/28/2021		M (1)(2)			9509626	(1)(2)	(1)(2)	Class A Common Stock	9509626	$0	0	I (3)	By Star Peak Sponsor LLC

Explanation of Responses:
(1)	As described in the registrant's registration statement on Form S-1 (File No. 333-240267) under the heading "Description of Securities-Founder Shares," the shares of Class B common stock were automatically convertible into shares of Class A common stock at the time of the registrant's initial business combination on a one-for-one basis, subject to certain adjustments described therein and have no expiration date. In connection with the closing of the registrant's initial business combination, the outstanding shares of Class B common stock were converted into shares of Class A common stock. Such securities are held directly by Star Peak Sponsor LLC (the "Sponsor").
(2)	The reporting person has voting and investment discretion with respect to certain securities held by the Sponsor and may be deemed to have shared beneficial ownership of such securities held directly by the Sponsor. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for purposes of Section 16 or for any other purpose.
(3)	As previously disclosed, on December 3, 2020, Star Peak Energy Transition Corp. entered into subscription agreements with certain investors (the "PIPE Offering") pursuant to which such investors agreed to purchase, immediately prior to the closing of the previously disclosed business combination transaction with Stem, Inc., an aggregate of $225,000,000 of the Issuer's shares of common stock at a price of $10.00 per share, or an aggregate of 22,500,000 shares of common stock (the "PIPE Shares"). Portcullis Partners, LP acquired 50,000 shares of common stock in the PIPE Offering and such PIPE Shares are held indirectly by the reporting person through Portcullis Partners, LP. The reporting person serves as Manager of the general partner, Portcullis G.P., LLC, for, and he and his spouse indirectly hold interests in, Portcullis Partners, L.P.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
MORGAN MICHAEL C C/O STAR PEAK SPONSOR LLC 1603 ORRINGTON AVENUE, 13TH FLOOR EVANSTON, IL 60201	X	X

Signatures
/s/ Tyson Taylor, as Attorney-in-Fact		4/30/2021
**Signature of Reporting Person		Date