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* STAHL NEIL (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) Director 10% Owner X Officer (give title below) Other (specify below) EVP Research and Development
	3. Date of Earliest Transaction (Month/Day/Year) 02/26/2020
	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	02/26/2020		M(1)		25,000	A	$52.03	36,380	D
Common Stock	02/26/2020		F(1)		14,651	D	$451.89	21,729	D
Common Stock	02/27/2020		S(1)		209	D	$435.93(2)	21,520	D
Common Stock	02/27/2020		S(1)		348	D	$436.43(3)	21,172	D
Common Stock	02/27/2020		S(1)		480	D	$437.41(4)	20,692	D
Common Stock	02/27/2020		S(1)		256	D	$438.63(5)	20,436	D
Common Stock	02/27/2020		S(1)		231	D	$439.73(6)	20,205	D
Common Stock	02/27/2020		S(1)		395	D	$440.24(7)	19,810	D
Common Stock	02/27/2020		S(1)		264	D	$443.67(8)	19,546	D
Common Stock	02/27/2020		S(1)		490	D	$444.65(9)	19,056	D
Common Stock	02/27/2020		S(1)		120	D	$445.91(10)	18,936	D
Common Stock	02/27/2020		S(1)		240	D	$448.86(11)	18,696	D
Common Stock	02/27/2020		S(1)		236	D	$449.53(12)	18,460	D
Common Stock	02/27/2020		S(1)		125	D	$450.1	18,335	D
Common Stock	02/27/2020		S(1)		233	D	$451.47(13)	18,102	D
Common Stock	02/27/2020		S(1)		130	D	$452.08	17,972	D
Common Stock	02/27/2020		S(1)		113	D	$453.45	17,859	D
Common Stock	02/27/2020		S(1)		102	D	$454.58(14)	17,757	D
Common Stock	02/27/2020		S(1)		2,967	D	$455.56(15)	14,790	D
Common Stock	02/27/2020		S(1)		743	D	$456.63(16)	14,047	D
Common Stock	02/27/2020		S(1)		141	D	$457.27(17)	13,906	D
Common Stock	02/27/2020		S(1)		460	D	$458.59(18)	13,446	D
Common Stock	02/27/2020		S(1)		692	D	$459.47(19)	12,754	D
Common Stock	02/27/2020		S(1)		252	D	$460.34(20)	12,502	D
Common Stock	02/27/2020		S(1)		614	D	$461.24(21)	11,888	D
Common Stock	02/27/2020		S(1)		1	D	$462.15	11,887	D
Common Stock	02/27/2020		S(1)		123	D	$463.1	11,764	D
Common Stock	02/27/2020		S(1)		126	D	$464.14(22)	11,638	D
Common Stock	02/27/2020		S(1)		227	D	$465.42(23)	11,411	D
Common Stock	02/27/2020		S(1)		31	D	$468.56	11,380(24)	D

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 a plan intended to comply with Rule 10b5-1(c).

2. Represents volume-weighted average price of sales of 209 shares of Company stock on February 27, 2020 at prices ranging from $435.90 to $435.96. 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 February 27, 2020 at each separate price.

3. Represents volume-weighted average price of sales of 348 shares of Company stock on February 27, 2020 at prices ranging from $436.30 to $436.49. 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 February 27, 2020 at each separate price.

4. Represents volume-weighted average price of sales of 480 shares of Company stock on February 27, 2020 at prices ranging from $437.16 to $437.92. 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 February 27, 2020 at each separate price.

5. Represents volume-weighted average price of sales of 256 shares of Company stock on February 27, 2020 at prices ranging from $438.58 to $438.69. 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 February 27, 2020 at each separate price.

6. Represents volume-weighted average price of sales of 231 shares of Company stock on February 27, 2020 at prices ranging from $439.72 to $439.76. 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 February 27, 2020 at each separate price.

7. Represents volume-weighted average price of sales of 395 shares of Company stock on February 27, 2020 at prices ranging from $440.05 to $440.64. 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 February 27, 2020 at each separate price.

8. Represents volume-weighted average price of sales of 264 shares of Company stock on February 27, 2020 at prices ranging from $443.49 to $443.84. 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 February 27, 2020 at each separate price.

9. Represents volume-weighted average price of sales of 490 shares of Company stock on February 27, 2020 at prices ranging from $444.35 to $444.93. 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 February 27, 2020 at each separate price.

10. Represents volume-weighted average price of sales of 120 shares of Company stock on February 27, 2020 at prices ranging from $445.91 to $445.95. 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 February 27, 2020 at each separate price.

11. Represents volume-weighted average price of sales of 240 shares of Company stock on February 27, 2020 at prices ranging from $448.73 to $448.98. 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 February 27, 2020 at each separate price.

12. Represents volume-weighted average price of sales of 236 shares of Company stock on February 27, 2020 at prices ranging from $449.25 to $449.87. 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 February 27, 2020 at each separate price.

13. Represents volume-weighted average price of sales of 233 shares of Company stock on February 27, 2020 at prices ranging from $451.07 to $451.83. 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 February 27, 2020 at each separate price.

14. Represents volume-weighted average price of sales of 102 shares of Company stock on February 27, 2020 at prices ranging from $454.58 to $454.98. 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 February 27, 2020 at each separate price.

15. Represents volume-weighted average price of sales of 2,967 shares of Company stock on February 27, 2020 at prices ranging from $455.11 to $455.99. 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 February 27, 2020 at each separate price.

16. Represents volume-weighted average price of sales of 743 shares of Company stock on February 27, 2020 at prices ranging from $456.10 to $456.99. 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 February 27, 2020 at each separate price.

17. Represents volume-weighted average price of sales of 141 shares of Company stock on February 27, 2020 at prices ranging from $457.11 to $457.64. 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 February 27, 2020 at each separate price.

18. Represents volume-weighted average price of sales of 460 shares of Company stock on February 27, 2020 at prices ranging from $458.31 to $458.90. 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 February 27, 2020 at each separate price.

19. Represents volume-weighted average price of sales of 692 shares of Company stock on February 27, 2020 at prices ranging from $459.09 to $459.90. 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 February 27, 2020 at each separate price.

20. Represents volume-weighted average price of sales of 252 shares of Company stock on February 27, 2020 at prices ranging from $460.02 to $460.70. 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 February 27, 2020 at each separate price.

21. Represents volume-weighted average price of sales of 614 shares of Company stock on February 27, 2020 at prices ranging from $461.00 to $461.81. 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 February 27, 2020 at each separate price.

22. Represents volume-weighted average price of sales of 126 shares of Company stock on February 27, 2020 at prices ranging from $464.13 to $464.78. 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 February 27, 2020 at each separate price.

23. Represents volume-weighted average price of sales of 227 shares of Company stock on February 27, 2020 at prices ranging from $465.04 to $465.73. 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 February 27, 2020 at each separate price.

24. Form one of two

	/s/**Neil Stahl	02/28/2020
	** 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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.