Submission Contact Information

LIVE TEST Submission Contact Information Name Phone E-Mail Address 144: Issuer Information Name of Issuer REGENERON PHARMACEUTICALS, INC. [...] SEC File Number 000-19034 Address of Issuer 777 OLD SAW MILL RIVER ROAD TARRYTOWN NEW YORK 10591 Phone 9148477000 Name of Person for Whose Account the Securities are To Be Sold Bassler Bonnie L See the definition of "person" in paragraph (a) of Rule 144. [...] Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. [...] In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice. [...] Relationship to Issuer Director 144: Securities Information Title of the Class of Securities To Be Sold Name and Address of the Broker Number of Shares or Other Units To Be Sold Aggregate Market Value Number of Shares or Other Units Outstanding Approximate Date of Sale Name the Securities Exchange COMMON RBC WEALTH MANAGEMENT 250 NICOLLET MALL, SUITE 1700 MINNEAPOLIS MN 55401 826 754964.00 [...] Donor Acquired Securities Acquired Payment Payment * COMMON 01/03/2024 STOCK OPTION EXERCISE ISSUER 826 01/03/2024 N/A * If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. [...] If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid. [...] Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold. [...] If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date. [...] Signature JEFFREY EISCHENS ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S. C.