4Filing Date: Aug 12, 2026
Regeneron (REGN)
Statement of Changes in Beneficial Ownership
View SEC Filing
ACC: 0001992352-26-000005
Total Value$607.7K
Trades3
Insiders1
Transaction Details
Guarini Kathryn
Director·Direct
Exercise · Acquire
Common Stock
Shares+400
Price$719.37
Total Value$287.7K
Shares Owned After1.00K
Transaction DateAug 10, 2026
10b5-1
Footnotes ▸
Disposition/acquisition made pursuant to a plan intended to comply with Rule 10b5-1(c) adopted on February 13, 2026.
Guarini Kathryn
Director·Direct
Sell · Dispose
Common Stock
Shares-400
Price$800.00
Total Value$320.0K
Shares Owned After603
Transaction DateAug 10, 2026
10b5-1
Footnotes ▸
Disposition/acquisition made pursuant to a plan intended to comply with Rule 10b5-1(c) adopted on February 13, 2026.
Guarini Kathryn
Director·Direct
Exercise · Dispose
Non-Qualified Stock Option (right to buy)Derivative
Shares-400
Price$0.00
Total Value$0
Shares Owned After1.56K
Transaction DateAug 10, 2026
ExpiresJan 2, 2035
10b5-1
Footnotes ▸
Disposition/acquisition made pursuant to a plan intended to comply with Rule 10b5-1(c) adopted on February 13, 2026. | On the date of the Company's first annual meeting of shareholders following the date of grant, a portion of these stock options equal to the portion of one year that had passed from the date of grant became exercisable, and the remainder became exercisable on the first anniversary of the date of grant.
Post-Transaction Holdings
Guarini Kathryn · Director
| Security | Shares | Change |
|---|---|---|
| Common Stock | 1.00K | - |
| Non-Qualified Stock Option (right to buy) | 1.56K | -400 (-20.43%) |
Original SEC Filing Textexpand_more
=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2026-08-10
10b5-1 Pre-arranged Plan: Yes
--- Issuer ---
Name: REGENERON PHARMACEUTICALS, INC. (REGN)
CIK: 0000872589
--- Reporting Owner ---
Name: Guarini Kathryn
CIK: 0001992352
Role: Director
--- Non-Derivative Transactions ---
[Transaction #1]
Security: Common Stock
Date: 2026-08-10 | Code: M (Exercise of derivative)
Shares: +400 | Price: $719.37
Total Value: $287,748.00
Shares Owned After: 1,003 | Ownership: D (Direct)
Footnotes:
[F1] Disposition/acquisition made pursuant to a plan intended to comply with Rule 10b5-1(c) adopted on February 13, 2026.
[Transaction #2]
Security: Common Stock
Date: 2026-08-10 | Code: S (Open market sale)
Shares: -400 | Price: $800.00
Total Value: $320,000.00
Shares Owned After: 603 | Ownership: D (Direct)
Footnotes:
[F1] Disposition/acquisition made pursuant to a plan intended to comply with Rule 10b5-1(c) adopted on February 13, 2026.
--- Derivative Transactions ---
[Transaction #1]
Security: Non-Qualified Stock Option (right to buy)
Date: 2026-08-10 | Code: M (Exercise of derivative)
Shares: -400 | Price: $0.00
Exercisable: N/A | Expires: 2035-01-02
Shares Owned After: 1,558 | Ownership: D (Direct)
Footnotes:
[F1] Disposition/acquisition made pursuant to a plan intended to comply with Rule 10b5-1(c) adopted on February 13, 2026.
[F2] On the date of the Company's first annual meeting of shareholders following the date of grant, a portion of these stock options equal to the portion of one year that had passed from the date of grant became exercisable, and the remainder became exercisable on the first anniversary of the date of grant.
--- Footnotes (Complete Index) ---
F1: Disposition/acquisition made pursuant to a plan intended to comply with Rule 10b5-1(c) adopted on February 13, 2026.
F2: On the date of the Company's first annual meeting of shareholders following the date of grant, a portion of these stock options equal to the portion of one year that had passed from the date of grant became exercisable, and the remainder became exercisable on the first anniversary of the date of grant.
--- Signature ---
/s/ /s/ Kathryn Guarini (2026-08-12)