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 *

BROWN MICHAEL S
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
_____ Officer (give title below)    _____ Other (specify below)
(Last)          (First)          (Middle)

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

9/22/2020
(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 9/22/2020  M(1)  2480 A$380.95 3123 D  
Common Stock 9/22/2020  M(1)  2610 A$376.69 5733 D  
Common Stock 9/22/2020  S(1)  5090 D$552.36 643 D  
Common Stock 5/13/2020  G  V 1000 D$0.0 10349 I by Trust 
Common Stock 9/22/2020  S(1)  1000 D$552.36 9349 I by Trust 
Common Stock         5000 I by SLAT (2)

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) $376.69 9/22/2020  M (1)    2610   (3)1/3/2027 Common Stock 2610 $0.0 0 D  
Non-Qualified Stock Option (right to buy) $380.95 9/22/2020  M (1)    2480   (3)1/2/2028 Common Stock 2480 $0.0 4959 D  

Explanation of Responses:
(1) Disposition/acquisition made pursuant to a plan intended to comply with Rule 10b5-1(c).
(2) These shares are held in a trust for the benefit of the reporting person's immediate family members. The reporting person's spouse is trustee of the trust. The reporting person disclaims beneficial ownership of these securities, and the filing of this report is not an admission that the reporting person is the beneficial owner of these securities for purposes of Section 16 or for any other purpose.
(3) The stock option becomes exercisable in three equal annual installments, commencing one year after the date of grant.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
BROWN MICHAEL S
777 OLD SAW MILL RIVER ROAD
TARRYTOWN, NY 10591
X



Signatures
/s/**Michael S. Brown9/22/2020
**Signature of Reporting PersonDate

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