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         57465 I by 2018 GRAT 
Common Stock         500000 I by 2019 GRAT 

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
Non-Qualified Stock Option (right to buy) $30.63 3/9/2020  M (1)    96736   (2)12/14/2020 Common Stock 96736 $0.0 150000 D  
Non-Qualified Stock Option (right to buy) $30.63 3/9/2020  M (1)    150000   (2)12/14/2020 Common Stock 150000 $0.0 0 (3)D  

Explanation of Responses:
(1) Disposition/acquisition made pursuant to a plan intended to comply with Rule 10b5-1(c).
(2) With respect to 96,736 underlying shares, the option award vested in four equal annual installments, commencing one year after the date of grant; and with respect to 150,000 underlying shares, the option became exercisable on December 31, 2013, based upon the satisfaction by the Company of certain performance criteria during the period ended December 31, 2013.
(3) Form two 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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