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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OMB Number:

3235-0287

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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 * VAGELOS P ROY	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) Chairman of the Board
(Last)          (First)          (Middle) 777 OLD SAW MILL RIVER ROAD	3. Date of Earliest Transaction (MM/DD/YYYY) 5/20/2020
(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	5/21/2020		S(1)		683	D	$577.37 (2)	307849	D
Common Stock	5/21/2020		S(1)		100	D	$578.34	307749	D
Common Stock	1/3/2020		G	V	564	D	$0.0	144333	I	by CLAT
Common Stock	4/2/2020		G	V	433	D	$0.0	143900	I	by CLAT
Common Stock								2207	I	By 401(k) Plan
Common Stock								83652	I	by Spouse as Trustee
Common Stock								1203	I	by trust for grandch (3)

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
Incentive Stock Option (right to buy)	$30.63	5/20/2020		M			3264	(4)	12/14/2020	Common Stock	3264	$0.0	0	D
Non-Qualified Stock Option (right to buy)	$30.63	5/20/2020		M (1)			77309	(4)	12/14/2020	Common Stock	77309	$0.0	231927	D
Non-Qualified Stock Option (right to buy)	$30.63	5/20/2020		M (1)			77309	(4)	12/14/2020	Common Stock	77309	$0.0	154618	D
Non-Qualified Stock Option (right to buy)	$30.63	5/20/2020		M (1)			77309	(4)	12/14/2020	Common Stock	77309	$0.0	77309	D
Non-Qualified Stock Option (right to buy)	$30.63	5/20/2020		M (1)			77309	(4)	12/14/2020	Common Stock	77309	$0.0	0 (5)	D

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 683 shares of Company stock on May 21, 2020 at prices ranging from $577.08 to $577.51. 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 21, 2020 at each separate price.
(3)	By a trust for the benefit of certain grandchildren of the reporting person, of which the reporting person and/or the spouse of the reporting person is trustee.
(4)	The stock option award (combined incentive stock option and non-qualified stock option) vests in four equal annual installments, commencing one year after the date of grant.
(5)	Form two of two

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
VAGELOS P ROY 777 OLD SAW MILL RIVER ROAD TARRYTOWN, NY 10591	X		Chairman of the Board

Signatures
/s/**P. Roy Vagelos		5/22/2020
**Signature of Reporting Person		Date