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* YANCOPOULOS GEORGE (Last) (First) (Middle) 777 OLD SAW MILL RIVER ROAD (Street) TARRYTOWN NY 10591 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol REGENERON PHARMACEUTICALS, INC. [ REGN ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner X Officer (give title below) Other (specify below) Bd. Co-Chair, President & CSO
	3. Date of Earliest Transaction (Month/Day/Year) 05/16/2024
	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
	Rule 10b5-1(c) Transaction Indication X Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

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	05/16/2024		S(1)		907	D	$967.4(2)	835,476	D
Common Stock	05/16/2024		S(1)		3,213	D	$968.44(3)	832,263	D
Common Stock	05/16/2024		S(1)		9,501	D	$969.39(4)	822,762	D
Common Stock	05/16/2024		S(1)		4,669	D	$970.26(5)	818,093	D
Common Stock	05/16/2024		S(1)		4,922	D	$971.56(6)	813,171	D
Common Stock	05/16/2024		S(1)		790	D	$972.22(7)	812,381	D
Common Stock	05/16/2024		S(1)		2,653	D	$973.8(8)	809,728	D
Common Stock	05/16/2024		S(1)		7,611	D	$974.51(9)	802,117	D
Common Stock	05/16/2024		S(1)		9,242	D	$975.48(10)	792,875	D
Common Stock	05/16/2024		S(1)		4,886	D	$976.52(11)	787,989	D
Common Stock	05/16/2024		S(1)		1,227	D	$977.38(12)	786,762	D
Common Stock	05/16/2024		S(1)		379	D	$978.18(13)	786,383	D
Common Stock								5,903	I	By 401(k) Plan
Common Stock								180,000	I	By Trust for Chldn.(14)
Common Stock								158,410	I	by 2022 GRAT II
Common Stock								18,148	I	by Children

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. Disposition/acquisition made pursuant to plans intended to comply with Rule 10b5-1(c) adopted on February 14, 2024.

2. Represents volume-weighted average price of sales of 907 shares of Company stock on May 16, 2024 at prices ranging from $967.13 to $967.97. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting person will provide full information regarding the number of shares sold by the reporting person on May 16, 2024 at each separate price.

3. Represents volume-weighted average price of sales of 3,213 shares of Company stock on May 16, 2024 at prices ranging from $968.04 to $968.93. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting person will provide full information regarding the number of shares sold by the reporting person on May 16, 2024 at each separate price.

4. Represents volume-weighted average price of sales of 9,501 shares of Company stock on May 16, 2024 at prices ranging from $969.03 to $969.99. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting person will provide full information regarding the number of shares sold by the reporting person on May 16, 2024 at each separate price.

5. Represents volume-weighted average price of sales of 4,669 shares of Company stock on May 16, 2024 at prices ranging from $970.00 to $970.99. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting person will provide full information regarding the number of shares sold by the reporting person on May 16, 2024 at each separate price.

6. Represents volume-weighted average price of sales of 4,922 shares of Company stock on May 16, 2024 at prices ranging from $971.05 to $971.99. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting person will provide full information regarding the number of shares sold by the reporting person on May 16, 2024 at each separate price.

7. Represents volume-weighted average price of sales of 790 shares of Company stock on May 16, 2024 at prices ranging from $972.00 to $972.87. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting person will provide full information regarding the number of shares sold by the reporting person on May 16, 2024 at each separate price.

8. Represents volume-weighted average price of sales of 2,653 shares of Company stock on May 16, 2024 at prices ranging from $973.20 to $973.97. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting person will provide full information regarding the number of shares sold by the reporting person on May 16, 2024 at each separate price.

9. Represents volume-weighted average price of sales of 7,611 shares of Company stock on May 16, 2024 at prices ranging from $974.00 to $974.99. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting person will provide full information regarding the number of shares sold by the reporting person on May 16, 2024 at each separate price.

10. Represents volume-weighted average price of sales of 9,242 shares of Company stock on May 16, 2024 at prices ranging from $975.00 to $975.98. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting person will provide full information regarding the number of shares sold by the reporting person on May 16, 2024 at each separate price.

11. Represents volume-weighted average price of sales of 4,886 shares of Company stock on May 16, 2024 at prices ranging from $976.00 to $976.97. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting person will provide full information regarding the number of shares sold by the reporting person on May 16, 2024 at each separate price.

12. Represents volume-weighted average price of sales of 1,227 shares of Company stock on May 16, 2024 at prices ranging from $977.02 to $977.99. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting person will provide full information regarding the number of shares sold by the reporting person on May 16, 2024 at each separate price.

13. Represents volume-weighted average price of sales of 379 shares of Company stock on May 16, 2024 at prices ranging from $978.07 to $978.75. Upon request by the Commission staff, the Company, or a security holder of the Company, the reporting person will provide full information regarding the number of shares sold by the reporting person on May 16, 2024 at each separate price.

14. As investment trustee of trusts for the benefit of the reporting person's children.

	/s/**George D. Yancopoulos	05/17/2024
	** 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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