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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
872589	Regeneron Pharmaceuticals Inc.	REGN	Pharmaceutical Preparations (2834)	133444607

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1121404	Sanofi	54 Rue La Boetie Paris I0 75008		No	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2020-05-29	20,421,899	$509.85	0	No	4	S	Direct
Common Stock	Disposition	2020-05-29	2,399,552	$509.85	400,000	No	4	S	Indirect	See note

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct
No	4	S	Indirect	See note

Footnotes

Represents sale in public offering to underwriters (10,615,094 shares) and a sale in private transaction to the Issuer (9,806,805 shares), in each case, by the Reporting Person.
Represents sale in public offering to underwriters by Aventisub LLC ("Aventisub").
Directly owned by Aventisub, formerly known as Aventis Pharmaceuticals Inc., an indirect, wholly-owned subsidiary of the Reporting Person.
Pursuant to the Amended and Restated Investor Agreement, dated as of January 11, 2014, by and among the Reporting Person, sanofi-aventis US LLC, Aventis, sanofi-aventis Amerique du Nord (collectively, the "Sanofi Parties") and the Issuer, as amended, the Sanofi Parties have agreed to vote their respective shares of the Issuer, subject to specified exceptions, in accordance with the recommendation of the Issuer's Board of Directors.