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 *

YANCOPOULOS GEORGE
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)
President and Chief Scientific
(Last)          (First)          (Middle)

777 OLD SAW MILL RIVER ROAD
3. Date of Earliest Transaction (MM/DD/YYYY)

3/9/2020
(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 3/9/2020  M(1)  96736 A$30.63 614535 D  
Common Stock 3/9/2020  F(1)  50545 D$476.42 563990 D  
Common Stock 3/9/2020  M(1)  150000 A$30.63 713990 D  
Common Stock 3/9/2020  F(1)  78376 D$476.42 635614 D  
Common Stock 3/10/2020  S(1)  1159 D$461.79 (2)634455 D  
Common Stock 3/10/2020  S(1)  3317 D$462.43 (3)631138 D  
Common Stock 3/10/2020  S(1)  5463 D$463.54 (4)625675 D  
Common Stock 3/10/2020  S(1)  5099 D$464.59 (5)620576 D  
Common Stock 3/10/2020  S(1)  7068 D$465.45 (6)613508 D  
Common Stock 3/10/2020  S(1)  11916 D$466.58 (7)601592 D  
Common Stock 3/10/2020  S(1)  10023 D$467.53 (8)591569 D  
Common Stock 3/10/2020  S(1)  8542 D$468.49 (9)583027 D  
Common Stock 3/10/2020  S(1)  7250 D$469.46 (10)575777 D  
Common Stock 3/10/2020  S(1)  5531 D$470.48 (11)570246 D  
Common Stock 3/10/2020  S(1)  5258 D$471.34 (12)564988 D  
Common Stock 3/10/2020  S(1)  10270 D$472.56 (13)554718 D  
Common Stock 3/10/2020  S(1)  8024 D$473.39 (14)546694 D  
Common Stock 3/10/2020  S(1)  7060 D$474.52 (15)539634 D  
Common Stock 3/10/2020  S(1)  4223 D$475.43 (16)535411 D  
Common Stock 3/10/2020  S(1)  7197 D$476.51 (17)528214 D  
Common Stock 3/10/2020  S(1)  4735 D$477.5 (18)523479 D  
Common Stock 3/10/2020  S(1)  1469 D$478.43 (19)522010 D  
Common Stock 3/10/2020  S(1)  1651 D$479.6 (20)520359 D  
Common Stock 3/10/2020  S(1)  60 D$480.34 520299 D  
Common Stock 3/10/2020  S(1)  100 D$481.68 520199 D  
Common Stock 3/10/2020  S(1)  355 D$483.8 (21)519844 D  
Common Stock 3/10/2020  S(1)  345 D$484.72 (22)519499 D  
Common Stock 3/10/2020  S(1)  1693 D$485.63 (23)517806 D  
Common Stock 3/10/2020  S(1)  7 D$486.31 517799 (24)D  
Common Stock         5791 I By 401(k) Plan 

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 Security3. Trans. Date3A. Deemed Execution Date, if any4. 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 Date7. 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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount 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 1,159 shares of Company stock on March 10, 2020 at prices ranging from $461.12 to $461.99. 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 March 10, 2020 at each separate price.
(3) Represents volume-weighted average price of sales of 3,317 shares of Company stock on March 10, 2020 at prices ranging from $462.02 to $462.94. 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 March 10, 2020 at each separate price.
(4) Represents volume-weighted average price of sales of 5,463 shares of Company stock on March 10, 2020 at prices ranging from $463.04 to $463.91. 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 March 10, 2020 at each separate price.
(5) Represents volume-weighted average price of sales of 5,099 shares of Company stock on March 10, 2020 at prices ranging from $464.09 to $464.99. 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 March 10, 2020 at each separate price.
(6) Represents volume-weighted average price of sales of 7,068 shares of Company stock on March 10, 2020 at prices ranging from $465.08 to $465.96. 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 March 10, 2020 at each separate price.
(7) Represents volume-weighted average price of sales of 11,916 shares of Company stock on March 10, 2020 at prices ranging from $466.02 to $466.99. 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 March 10, 2020 at each separate price.
(8) Represents volume-weighted average price of sales of 10,023 shares of Company stock on March 10, 2020 at prices ranging from $467.00 to $467.99. 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 March 10, 2020 at each separate price.
(9) Represents volume-weighted average price of sales of 8,542 shares of Company stock on March 10, 2020 at prices ranging from $468.01 to $468.95. 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 March 10, 2020 at each separate price.
(10) Represents volume-weighted average price of sales of 7,250 shares of Company stock on March 10, 2020 at prices ranging from $469.03 to $469.94. 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 March 10, 2020 at each separate price.
(11) Represents volume-weighted average price of sales of 5,531 shares of Company stock on March 10, 2020 at prices ranging from $470.05 to $470.99. 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 March 10, 2020 at each separate price.
(12) Represents volume-weighted average price of sales of 5,258 shares of Company stock on March 10, 2020 at prices ranging from $471.00 to $471.99. 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 March 10, 2020 at each separate price.
(13) Represents volume-weighted average price of sales of 10,270 shares of Company stock on March 10, 2020 at prices ranging from $472.02 to $472.97. 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 March 10, 2020 at each separate price.
(14) Represents volume-weighted average price of sales of 8,024 shares of Company stock on March 10, 2020 at prices ranging from $473.02 to $473.99. 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 March 10, 2020 at each separate price.
(15) Represents volume-weighted average price of sales of 7,060 shares of Company stock on March 10, 2020 at prices ranging from $474.04 to $474.99. 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 March 10, 2020 at each separate price.
(16) Represents volume-weighted average price of sales of 4,223 shares of Company stock on March 10, 2020 at prices ranging from $475.06 to $475.96. 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 March 10, 2020 at each separate price.
(17) Represents volume-weighted average price of sales of 7,197 shares of Company stock on March 10, 2020 at prices ranging from $476.02 to $476.97. 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 March 10, 2020 at each separate price.
(18) Represents volume-weighted average price of sales of 4,735 shares of Company stock on March 10, 2020 at prices ranging from $477.00 to $477.94. 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 March 10, 2020 at each separate price.
(19) Represents volume-weighted average price of sales of 1,469 shares of Company stock on March 10, 2020 at prices ranging from $478.09 to $478.99. 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 March 10, 2020 at each separate price.
(20) Represents volume-weighted average price of sales of 1,651 shares of Company stock on March 10, 2020 at prices ranging from $479.00 to $479.94. 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 March 10, 2020 at each separate price.
(21) Represents volume-weighted average price of sales of 355 shares of Company stock on March 10, 2020 at prices ranging from $483.78 to $483.89. 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 March 10, 2020 at each separate price.
(22) Represents volume-weighted average price of sales of 345 shares of Company stock on March 10, 2020 at prices ranging from $484.72 to $484.76. 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 March 10, 2020 at each separate price.
(23) Represents volume-weighted average price of sales of 1,693 shares of Company stock on March 10, 2020 at prices ranging from $485.12 to $485.65. 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 March 10, 2020 at each separate price.
(24) Form one of two

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
YANCOPOULOS GEORGE
777 OLD SAW MILL RIVER ROAD
TARRYTOWN, NY 10591
X
President and Chief Scientific

Signatures
/s/**George D. Yancopoulos3/11/2020
**Signature of Reporting PersonDate

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