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SEC FORM 4 SEC Form 4
FORM 4 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
or Section 30(h) of the Investment Company Act of 1940 		 
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checkbox unchecked Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
SCHLEIFER LEONARD S
(Last) (First) (Middle)
777 OLD SAW MILL RIVER ROAD
(Street)
TARRYTOWN NY 10591
(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
REGENERON PHARMACEUTICALS, INC. [ REGN ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
checkbox checked Director 10% Owner
checkbox checked Officer (give title below) Other (specify below)
Bd. Co-Chair, President & CEO
3. Date of Earliest Transaction (Month/Day/Year)
06/11/2024
4. If Amendment, Date of Original Filed (Month/Day/Year)
 6. Individual or Joint/Group Filing (Check Applicable Line)
checkbox checked Form filed by One Reporting Person
Form filed by More than One Reporting Person
Rule 10b5-1(c) Transaction Indication

checkbox checked Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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 157,552 I 2023 GRAT
Common Stock 5,932 I By 401(k) Plan
Common Stock 06/11/2024 S(1) 7,321 D $1,015.28(2) 56,877 I By Trust
Common Stock 06/11/2024 S(1) 1,743 D $1,016.04(3) 55,134 I By Trust
Common Stock 06/12/2024 S(1) 14,879 D $1,015.3(4) 40,255 I By Trust
Common Stock 06/12/2024 S(1) 270 D $1,016.62(5) 39,985 I By Trust
Common Stock 466,877 D
Common Stock 06/12/2024 C(1) 1,000 A $0.00 1,000 I by Trust for Son
Common Stock 06/12/2024 S(1) 1,000 D $1,025.27(6) 0 I by Trust for Son
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 (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 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 (Month/Day/Year) 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: 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
Class A Stock $0.00(7) 06/12/2024 C(1) 1,000 (8) (8) Common Stock 1,000 $0.00 14,775 I by Trust for Son
Class A Stock $0.00(7) (8) (8) Common Stock 1,710,790 1,710,790 D
Explanation of Responses:
1. Disposition/acquisition made pursuant to a plan intended to comply with Rule 10b5-1(c) adopted on February 5, 2024.
2. Represents volume-weighted average price of sales of 7,321 shares of common stock of Regeneron Pharmaceuticals, Inc. (the "Company") on June 11, 2024 at prices ranging from $1,015.00 to $1,015.85. 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 June 11, 2024 at each separate price.
3. Represents volume-weighted average price of sales of 1,743 shares of Company stock on June 11, 2024 at prices ranging from $1,016.04 to $1,016.10. 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 June 11, 2024 at each separate price.
4. Represents volume-weighted average price of sales of 14,879 shares of Company stock on June 12, 2024 at prices ranging from $1,015.00 to $1,015.95. 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 June 12, 2024 at each separate price.
5. Represents volume-weighted average price of sales of 270 shares of Company stock on June 12, 2024 at prices ranging from $1,016.10 to $1,016.80. 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 June 12, 2024 at each separate price.
6. Represents volume-weighted average price of sales of 1,000 shares of Company stock on June 12, 2024 at prices ranging from $1,025.00 to $1,025.55. 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 June 12, 2024 at each separate price.
7. Class A Stock of the Company converts to common stock of the Company on a one-to-one basis upon certain events or upon election of the shareholder.
8. These shares of Class A Stock are presently convertible and such conversion feature does not expire.
/s/**Leonard S. Schleifer 06/13/2024
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.