Sec Form 4 Filing - SING GEORGE L @ REGENERON PHARMACEUTICALS, INC. - 2020-08-20

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 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person SING GEORGE L 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/YY) 08/20/2020 (Street) TARRYTOWN, NY10591 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction 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 08/20/2020 S 3,783 D $ 615.51 ( 1 ) 111,632 D Common Stock 08/20/2020 S 1,742 D $ 616.25 ( 2 ) 109,890 D Common Stock 08/20/2020 S 3,454 D $ 617.64 ( 3 ) 106,436 D Common Stock 08/20/2020 S 1,318 D $ 618.49 ( 4 ) 105,118 D Common Stock 08/20/2020 S 703 D $ 619.29 ( 5 ) 104,415 D Common Stock 08/20/2020 M 10,000 A $ 57.11 114,415 D Common Stock 08/20/2020 S 3,290 D $ 615.48 ( 6 ) 111,125 D Common Stock 08/20/2020 S 1,627 D $ 616.26 ( 7 ) 109,498 D Common Stock 08/20/2020 S 3,371 D $ 617.68 ( 8 ) 106,127 D Common Stock 08/20/2020 S 1,152 D $ 618.57 ( 9 ) 104,975 D Common Stock 08/20/2020 S 560 D $ 619.33 ( 10 ) 104,415 D Common Stock 08/21/2020 M 4,963 A $ 177.82 109,378 D Common Stock 08/21/2020 S 300 D $ 608.06 ( 11 ) 109,078 D Common Stock 08/21/2020 M 5,000 A $ 57.11 114,078 D Common Stock 08/21/2020 S 9,663 D $ 605.04 ( 12 ) 104,415 D Common Stock 08/21/2020 S 200 D $ 608.15 104,215 D Common Stock 08/21/2020 S 9,800 D $ 605.05 ( 13 ) 94,415 D Common Stock 08/24/2020 M 10,037 A $ 177.82 104,452 D Common Stock 08/24/2020 S 1,201 D $ 594.3 ( 14 ) 103,251 D Common Stock 08/24/2020 S 1,607 D $ 595.43 ( 15 ) 101,644 D Common Stock 08/24/2020 S 1,100 D $ 596.63 ( 16 ) 100,544 D Common Stock 08/24/2020 S 188 D $ 597.46 ( 17 ) 100,356 D Common Stock 08/24/2020 S 5,741 D $ 592.27 ( 18 ) 94,615 D Common Stock 08/24/2020 S 200 D $ 593.11 ( 19 ) 94,415 D Common Stock 08/24/2020 S 1,400 D $ 594.3 ( 20 ) 93,015 D Common Stock 08/24/2020 S 1,400 D $ 595.43 ( 21 ) 91,615 D Common Stock 08/24/2020 S 1,303 D $ 596.56 ( 22 ) 90,312 D Common Stock 08/24/2020 S 135 D $ 597.93 ( 23 ) 90,177 D Common Stock 08/24/2020 S 5,626 D $ 592.28 ( 24 ) 84,551 D Common Stock 08/24/2020 S 136 D $ 593.23 ( 25 ) 84,415 ( 26 ) D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other SING GEORGE L 777 OLD SAW MILL RIVER ROAD TARRYTOWN, NY10591 X Signatures /s/**George L. Sing 08/24/2020 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents volume-weighted average price of sales of 3,783 shares of Company stock on August 20, 2020 at prices ranging from $615.00 to $615.98. 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 August 20, 2020 at each separate price. ( 2 )Represents volume-weighted average price of sales of 1,742 shares of Company stock on August 20, 2020 at prices ranging from $616.01 to $616.94. 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 August 20, 2020 at each separate price. ( 3 )Represents volume-weighted average price of sales of 3,454 shares of Company stock on August 20, 2020 at prices ranging from $617.15 to $618.10. 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 August 20, 2020 at each separate price. ( 4 )Represents volume-weighted average price of sales of 1,318 shares of Company stock on August 20, 2020 at prices ranging from $618.15 to $619.13. 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 August 20, 2020 at each separate price. ( 5 )Represents volume-weighted average price of sales of 703 shares of Company stock on August 20, 2020 at prices ranging from $619.15 to $619.44. 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 August 20, 2020 at each separate price. ( 6 )Represents volume-weighted average price of sales of 3,290 shares of Company stock on August 20, 2020 at prices ranging from $615.00 to $615.97. 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 August 20, 2020 at each separate price. ( 7 )Represents volume-weighted average price of sales of 1,627 shares of Company stock on August 20, 2020 at prices ranging from $616.00 to $616.94. 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 August 20, 2020 at each separate price. ( 8 )Represents volume-weighted average price of sales of 3,371 shares of Company stock on August 20, 2020 at prices ranging from $617.15 to $618.14. 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 August 20, 2020 at each separate price. ( 9 )Represents volume-weighted average price of sales of 1,152 shares of Company stock on August 20, 2020 at prices ranging from $618.15 to $619.13. 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 August 20, 2020 at each separate price. ( 10 )Represents volume-weighted average price of sales of 560 shares of Company stock on August 20, 2020 at prices ranging from $619.21 to $619.45. 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 August 20, 2020 at each separate price. ( 11 )Represents volume-weighted average price of sales of 300 shares of Company stock on August 21, 2020 at prices ranging from $608.01 to $608.15. 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 August 21, 2020 at each separate price. ( 12 )Represents volume-weighted average price of sales of 9,663 shares of Company stock on August 21, 2020 at prices ranging from $605.00 to $605.45. 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 August 21, 2020 at each separate price. ( 13 )Represents volume-weighted average price of sales of 9,800 shares of Company stock on August 21, 2020 at prices ranging from $605.00 to $605.45. 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 August 21, 2020 at each separate price. ( 14 )Represents volume-weighted average price of sales of 1,201 shares of Company stock on August 24, 2020 at prices ranging from $594.01 to $594.89. 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 August 24, 2020 at each separate price. ( 15 )Represents volume-weighted average price of sales of 1,607 shares of Company stock on August 24, 2020 at prices ranging from $595.05 to $596.03. 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 August 24, 2020 at each separate price. ( 16 )Represents volume-weighted average price of sales of 1,100 shares of Company stock on August 24, 2020 at prices ranging from $596.15 to $596.89. 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 August 24, 2020 at each separate price. ( 17 )Represents volume-weighted average price of sales of 188 shares of Company stock on August 24, 2020 at prices ranging from $597.17 to $598.09. 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 August 24, 2020 at each separate price. ( 18 )Represents volume-weighted average price of sales of 5,741 shares of Company stock on August 24, 2020 at prices ranging from $592.00 to $592.89. 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 August 24, 2020 at each separate price. ( 19 )Represents volume-weighted average price of sales of 200 shares of Company stock on August 24, 2020 at prices ranging from $593.06 to $593.15. 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 August 24, 2020 at each separate price. ( 20 )Represents volume-weighted average price of sales of 1,400 shares of Company stock on August 24, 2020 at prices ranging from $594.01 to $594.84. 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 August 24, 2020 at each separate price. ( 21 )Represents volume-weighted average price of sales of 1,400 shares of Company stock on August 24, 2020 at prices ranging from $595.15 to $595.99. 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 August 24, 2020 at each separate price. ( 22 )Represents volume-weighted average price of sales of 1,303 shares of Company stock on August 24, 2020 at prices ranging from $596.15 to $596.99. 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 August 24, 2020 at each separate price. ( 23 )Represents volume-weighted average price of sales of 135 shares of Company stock on August 24, 2020 at prices ranging from $597.68 to $598.02. 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 August 24, 2020 at each separate price. ( 24 )Represents volume-weighted average price of sales of 5,626 shares of Company stock on August 24, 2020 at prices ranging from $592.00 to $592.98. 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 August 24, 2020 at each separate price. ( 25 )Represents volume-weighted average price of sales of 136 shares of Company stock on August 24, 2020 at prices ranging from $593.06 to $593.71. 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 August 24, 2020 at each separate price. ( 26 )Form one of two

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