Statement of Changes in Beneficial Ownership (4)

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 * LAROSA JOSEPH J	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 General Counsel and Secret
(Last)          (First)          (Middle) 777 OLD SAW MILL RIVER ROAD	3. Date of Earliest Transaction (MM/DD/YYYY) 4/16/2020
(Street) TARRYTOWN, NY 10591 (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	4/16/2020		M(1)		5000	A	$59.2	19438	D
Common Stock	4/16/2020		F(1)		2733	D	$529.79	16705	D
Common Stock	4/17/2020		S(1)		95	D	$541.94	16610	D
Common Stock	4/17/2020		S(1)		5	D	$542.31	16605	D
Common Stock	4/17/2020		S(1)		100	D	$547.0	16505	D
Common Stock	4/17/2020		S(1)		99	D	$548.27	16406	D
Common Stock	4/17/2020		S(1)		100	D	$549.24	16306	D
Common Stock	4/17/2020		S(1)		6	D	$550.0	16300	D
Common Stock	4/17/2020		S(1)		104	D	$552.85	16196	D
Common Stock	4/17/2020		S(1)		114	D	$555.1	16082	D
Common Stock	4/17/2020		S(1)		198	D	$556.51 (2)	15884	D
Common Stock	4/17/2020		S(1)		93	D	$557.4	15791	D
Common Stock	4/17/2020		S(1)		293	D	$558.55 (3)	15498	D
Common Stock	4/17/2020		S(1)		285	D	$559.79 (4)	15213	D
Common Stock	4/17/2020		S(1)		163	D	$560.38 (5)	15050	D
Common Stock	4/17/2020		S(1)		63	D	$561.76	14987	D
Common Stock	4/17/2020		S(1)		191	D	$562.56 (6)	14796	D
Common Stock	4/17/2020		S(1)		171	D	$563.39 (7)	14625	D
Common Stock	4/17/2020		S(1)		93	D	$564.19	14532	D
Common Stock	4/17/2020		S(1)		94	D	$565.92 (8)	14438	D
Common Stock	4/17/2020		M(1)		6622	A	$59.2	21060	D
Common Stock	4/17/2020		F(1)		3602	D	$555.82	17458	D
Common Stock	4/17/2020		M(1)		5000	A	$59.2	22458	D
Common Stock	4/17/2020		F(1)		2720	D	$555.82	19738	D
Common Stock	4/20/2020		S(1)		51	D	$561.57	19687	D
Common Stock	4/20/2020		S(1)		21	D	$562.71	19666	D
Common Stock	4/20/2020		S(1)		416	D	$563.58 (9)	19250	D
Common Stock	4/20/2020		S(1)		377	D	$564.74 (10)	18873	D
Common Stock	4/20/2020		S(1)		1468	D	$565.6 (11)	17405	D
Common Stock	4/20/2020		S(1)		1189	D	$566.44 (12)	16216 (13)	D

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

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 198 shares of Company stock on April 17, 2020 at prices ranging from $556.43 to $556.58. 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 April 17, 2020 at each separate price.
(3)	Represents volume-weighted average price of sales of 293 shares of Company stock on April 17, 2020 at prices ranging from $558.42 to $558.78. 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 April 17, 2020 at each separate price.
(4)	Represents volume-weighted average price of sales of 285 shares of Company stock on April 17, 2020 at prices ranging from $559.47 to $559.89. 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 April 17, 2020 at each separate price.
(5)	Represents volume-weighted average price of sales of 163 shares of Company stock on April 17, 2020 at prices ranging from $560.27 to $560.53. 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 April 17, 2020 at each separate price.
(6)	Represents volume-weighted average price of sales of 191 shares of Company stock on April 17, 2020 at prices ranging from $562.31 to $562.83. 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 April 17, 2020 at each separate price.
(7)	Represents volume-weighted average price of sales of 171 shares of Company stock on April 17, 2020 at prices ranging from $563.33 to $563.45. 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 April 17, 2020 at each separate price.
(8)	Represents volume-weighted average price of sales of 94 shares of Company stock on April 17, 2020 at prices ranging from $565.77 to $565.94. 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 April 17, 2020 at each separate price.
(9)	Represents volume-weighted average price of sales of 416 shares of Company stock on April 20, 2020 at prices ranging from $563.35 to $563.92. 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 April 20, 2020 at each separate price.
(10)	Represents volume-weighted average price of sales of 377 shares of Company stock on April 20, 2020 at prices ranging from $564.03 to $564.97. 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 April 20, 2020 at each separate price.
(11)	Represents volume-weighted average price of sales of 1,468 shares of Company stock on April 20, 2020 at prices ranging from $565.03 to $565.93. 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 April 20, 2020 at each separate price.
(12)	Represents volume-weighted average price of sales of 1,189 shares of Company stock on April 20, 2020 at prices ranging from $566.00 to $566.82. 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 April 20, 2020 at each separate price.
(13)	Form one of two

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
LAROSA JOSEPH J 777 OLD SAW MILL RIVER ROAD TARRYTOWN, NY 10591			EVP General Counsel and Secret

Signatures
/s/**Joseph J. LaRosa		4/20/2020
**Signature of Reporting Person		Date