Regeneron CFO Fenimore exercises 6,000 stock options

The exercise included 4,243 shares delivered or withheld for payment of exercise price or tax liability.

Available on EDGAR 11/04/2026 - 04:08 PM EST Accepted by SEC EDGAR 11/04/2026 - 04:07 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Regeneron Pharmaceuticals, Inc. (REGN) reported that EVP Finance CFO Christopher R. Fenimore exercised 6,000 non-qualified stock options on November 2, 2026, at an exercise price of $381.92 per share, acquiring 6,000 common shares. The report also lists 4,243 shares delivered or withheld for payment of exercise price or tax liability and a gift of 15 common shares; the option position after the exercise was 0. Reported indirect holdings include 1,576 shares through a 401(k) Plan, 1,897 shares in a trust for the benefit of the reporting person's spouse, and 25 shares each in trusts for a daughter and son.

Insider Trade Summary

6,000 shares exercised/converted

Exercise 4 txns

Insider Fenimore Christopher R.

Role EVP Finance CFO

Type	Security	Shares	Price	Value
Exercise	Non-Qualified Stock Option (right to buy) F2	6,000	$0.00	$0.00
Exercise	Common Stock	6,000	$381.92	$2.29M
Exercise Price or Tax Liability	Common Stock	4,243	$950.50	$4.03M
Gift	Common Stock	15	$0.00	$0.00
Holding	Common Stock	--	--	--
Holding	Common Stock F1	--	--	--
Holding	Common Stock	--	--	--
Holding	Common Stock	--	--	--

Holdings After Transaction: Non-Qualified Stock Option (right to buy) — 0 contracts (Direct); Common Stock — 21,726 shares (Direct); Common Stock — 1,576 shares (Indirect, By 401(k) Plan); Common Stock — 1,897 shares (Indirect, By Trust); Common Stock — 25 shares (Indirect, by Trust for Daugh); Common Stock — 25 shares (Indirect, by Trust for Son)

Footnotes (2)

1. F1. These shares are held in a trust for the benefit of the reporting person's spouse. The reporting person and the reporting person's spouse are trustees of the trust.
2. F2. The stock option award vested in four equal annual installments, commencing one year after the date of grant.

Key Figures

Non-qualified stock options exercised: 6,000 options Exercise price: $381.92 per share Common shares acquired: 6,000 shares +5 more

8 metrics

Non-qualified stock options exercised 6,000 options November 2, 2026

Exercise price $381.92 per share Options exercised November 2, 2026

Common shares acquired 6,000 shares Option exercise on November 2, 2026

Shares delivered or withheld 4,243 shares For payment of exercise price or tax liability on November 2, 2026

Common shares gifted 15 shares November 2, 2026

Option position following exercise 0 options After the November 2, 2026 exercise

Indirect shares held through 401(k) Plan 1,576 shares Reported November 2, 2026

Shares held in spouse-benefit trust 1,897 shares Reported November 2, 2026

Key Terms

Non-Qualified Stock Option, exercise price, annual installments, trustees

4 terms

Non-Qualified Stock Option financial

"Non-Qualified Stock Option (right to buy)"

A non-qualified stock option (NSO) is a contract that lets an employee or service provider buy company shares at a fixed price for a set period, like a voucher to purchase stock later at today’s price. It matters to investors because exercising NSOs creates ordinary income for the holder and can increase share count, affecting a company’s earnings and ownership mix; think of it as a future sale that can dilute existing shareholders and has immediate tax consequences for the recipient.

exercise price financial

"conversion_or_exercise_price"

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

annual installments technical

"vested in four equal annual installments"

trustees technical

"the reporting person's spouse are trustees of the trust"

Trustees are people or a small group legally appointed to hold and manage assets, documents, or obligations on behalf of others and must act in those beneficiaries’ best interests. Think of them as a neutral guardian or custodian who enforces rules, protects assets, and makes decisions that can affect payments, corporate governance, or recovery in a default — all of which directly influence investor returns and risk.

FAQ

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

How many REGN options did Christopher R. Fenimore exercise?

Christopher R. Fenimore exercised 6,000 non-qualified stock options on November 2, 2026, at an exercise price of $381.92 per share, acquiring 6,000 common shares. The option position following the exercise was 0, and the options had an expiration date of December 16, 2026.

How did Christopher R. Fenimore's REGN option award vest?

The option award vested in four equal annual installments, commencing one year after the date of grant.

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

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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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Fenimore Christopher R.

(Last) (First) (Middle)

777 OLD SAW MILL RIVER ROAD

(Street)

TARRYTOWN NEW YORK 10591

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
REGENERON PHARMACEUTICALS, INC. [ REGN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP Finance CFO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
11/02/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	11/02/2026		M		6,000	A	$381.92	25,984	D
Common Stock	11/02/2026		F		4,243	D	$950.5	21,741	D
Common Stock	11/02/2026		G		15	D	$0.0	21,726	D
Common Stock								1,576	I	By 401(k) Plan
Common Stock								1,897	I	By Trust(1)
Common Stock								25	I	by Trust for Daugh
Common Stock								25	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
Non-Qualified Stock Option (right to buy)	$381.92	11/02/2026		M			6,000	(2)	12/16/2026	Common Stock	6,000	$0.0	0	D

Explanation of Responses:

1. These shares are held in a trust for the benefit of the reporting person's spouse. The reporting person and the reporting person's spouse are trustees of the trust.

2. The stock option award vested in four equal annual installments, commencing one year after the date of grant.

	/s/ Christopher R. Fenimore	11/04/2026
	** 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.
* Form 4: SEC 1474 (03-26)