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	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	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* Prokupets Elena (Last) (First) (Middle) C/O C4 THERAPEUTICS, INC. 490 ARSENAL WAY #200 (Street) WATERTOWN MA 02472 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol C4 Therapeutics, Inc. [ CCCC ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner Officer (give title below) Other (specify below)
	3. Date of Earliest Transaction (Month/Day/Year) 09/14/2021
	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
Common Stock	09/14/2021		S(1)		492	D	$50.0069(2)	83,522	I	By Spouse
Common Stock	09/14/2021		S(3)		492	D	$50.0276(2)	587,731	I	By ERP Business Holdings, LP(4)
Common Stock	09/15/2021		S(1)		30,000	D	$48.7068(5)	53,522	I	By Spouse
Common Stock	09/15/2021		S(3)		24,193	D	$48.9683(6)	563,538	I	By ERP Business Holdings, LP(4)
Common Stock	09/16/2021		S(1)		346	D	$50.0085(7)	53,176	I	By Spouse
Common Stock	09/16/2021		S		25,807	D	$48.6177(8)	510,731	I	By ERP Business Holdings, LP(4)
Common Stock	09/16/2021		S(3)		346	D	$50.0146(9)	510,385	I	By ERP Business Holdings, LP(4)

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

Explanation of Responses:

1. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted on March 12, 2021.

2. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $50.00 to $50.145. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

3. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted on March 15, 2021.

4. Shares held by ERP Business Holdings, L.P. The Reporting Person disclaims beneficial ownership of these shares except to the extent of her pecuniary interest therein.

5. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $48.25 to $49.00. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

6. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $48.80 to $49.32. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

7. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $50.00 to $50.05. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

8. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $48.50 to $49.165. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

9. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $50.00 to $50.045. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

Remarks:

	/s/ Shoaib Ghias, Attorney-in-Fact	09/16/2021
	** 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).
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