Regeneron officer proposes $984K share sale

Earlier reported sales were 1,215 shares on September 2 and 1,131 shares on September 3, 2026.

Rhea-AI Filing Summary

Regeneron Pharmaceuticals, Inc. officer Marion McCourt reported a proposed sale of 1,132 common shares through UBS Financial Services Inc., with a stated aggregate market value of $984,194.76 and an approximate sale date of October 30, 2026. The notice also lists sales during the preceding three months of 1,215 shares for $1,032,750.00 on September 2, 2026, and 1,131 shares for $969,708.09 on September 3, 2026.

Key Figures

Proposed sale: 1,132 shares Aggregate market value: $984,194.76 Shares outstanding: 101,630,713 shares +2 more

5 metrics

Proposed sale 1,132 shares Common shares; approximate sale date October 30, 2026

Aggregate market value $984,194.76 Securities proposed for sale

Shares outstanding 101,630,713 shares Reported in the proposed-sale information

Prior sale 1,215 shares; $1,032,750.00 Marion McCourt sale on September 2, 2026

Prior sale 1,131 shares; $969,708.09 Marion McCourt sale on September 3, 2026

Key Terms

Rule 144, RSA Vesting, attorney-in-fact

3 terms

Rule 144 regulatory

"definition of person in paragraph (a) of Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

RSA Vesting technical

"Nature of acquisition: RSA Vesting"

attorney-in-fact regulatory

"UBS Financial Services Inc., as attorney-in-fact"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many REGN shares is Marion McCourt proposing to sell?

Marion McCourt reported a proposed sale of 1,132 Regeneron common shares, with an aggregate market value of $984,194.76 and an approximate sale date of October 30, 2026. UBS Financial Services Inc. is listed as the broker.

What sales by Marion McCourt are listed for the previous three months?

The notice lists sales of 1,215 common shares for $1,032,750.00 on September 2, 2026, and 1,131 common shares for $969,708.09 on September 3, 2026.

How did Marion McCourt acquire the shares proposed for sale?

The 1,132 common shares are listed as acquired through RSA vesting from the issuer on December 12, 2023.

AI-generated analysis. How Rhea-AI works. Not financial advice.

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Available on EDGAR 10/30/2026 - 04:14 PM EDT Accepted by SEC EDGAR 10/30/2026 - 04:14 PM EDT Learn about SEC filing dates

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	0001663758
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	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	McCourt Marion
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	Officer

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	UBS Financial Services Inc. 11 Madison Ave 4th Floor New York NY 10010	1132	984194.76	101630713	10/30/2026	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	12/12/2023	RSA Vesting	Issuer			1132	12/12/2023	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.

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
Marion McCourt 777 OLD SAW MILL RIVER ROAD TARRYTOWN NY 10591	Common	09/02/2026	1215	1032750.00
Marion McCourt 777 OLD SAW MILL RIVER ROAD TARRYTOWN NY 10591	Common	09/03/2026	1131	969708.09

144: Remarks and Signature

Remarks
Date of Notice	10/30/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	02/17/2026
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	/s/ UBS Financial Services Inc, as attorney-in-fact for Marion McCourt
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)