Regeneron (NASDAQ: REGN) holder Bonnie Bassler plans 1,500-share sale of stock

Rhea-AI Filing Summary

Regeneron Pharmaceuticals insider Bonnie Bassler has filed a Form 144 notice to sell common stock. The filing covers a proposed sale of 1500 common shares through broker RBC Capital Markets LLC, with an aggregate market value of 1200000.00 and 103282318 shares outstanding, to be sold on or about 01/07/2026 on NASDAQ.

The shares to be sold were acquired from the issuer on 01/07/2026 via an option exercise for 1500 shares, paid by check on the same date. The filing also notes that during the past three months, Bonnie Bassler sold 760 Regeneron Pharmaceuticals Inc securities on 11/20/2025 for gross proceeds of 570000.00.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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 CAPITAL MARKETS LLC 250 NICOLLET MALL, SUITE 1700 MINNEAPOLIS MN 55401	1500	1200000.00	103282318	01/07/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
COMMON	01/07/2026	OPTION EXERCISE	ISSUER			1500	01/07/2026	CHECK

* 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.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
BONNIE BASSLER C/O RBC CAPITAL MARKETS LLC 250 NICOLLET MALL MINNEAPOLIS MN 55401	REGENERON PHARMACEUTICALS INC	11/20/2025	760	570000.00

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. 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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does Regeneron (REGN)'s latest Form 144 filing disclose?

The Form 144 filing discloses that Bonnie Bassler intends to sell 1500 common shares of Regeneron Pharmaceuticals Inc through RBC Capital Markets LLC, with an aggregate market value of 1200000.00, to be sold on or about 01/07/2026 on NASDAQ.

How were the Regeneron (REGN) shares in this Form 144 acquired?

The 1500 common shares covered by the notice were acquired on 01/07/2026 via an option exercise from the issuer, with payment made by check on the same date.

Who is selling shares in this Regeneron (REGN) Form 144 filing?

The seller named in the filing is Bonnie Bassler, with sales to be executed through RBC Capital Markets LLC, located at 250 Nicollet Mall, Suite 1700, Minneapolis, MN 55401.

How many Regeneron (REGN) shares are outstanding in this Form 144?

The Form 144 indicates that the number of Regeneron common shares outstanding is 103282318, providing context for the planned sale of 1500 shares.

What recent Regeneron (REGN) stock sales has Bonnie Bassler made?

During the past three months, the filing reports that Bonnie Bassler sold 760 Regeneron Pharmaceuticals Inc securities on 11/20/2025, generating 570000.00 in gross proceeds.

Which exchange and broker are involved in this Regeneron (REGN) planned sale?

The planned sale of 1500 Regeneron common shares is listed to occur on the NASDAQ market, using RBC Capital Markets LLC as the broker.