Key facts
- This page summarizes Joseph J. Larosa's Form 4 filing for REGENERON PHARMACEUTICALS, INC. (REGN).
- 3 reported transactions and 1 derivative row are listed below.
- Accepted by SEC: 21 Aug 2026, 16:01.
Joseph J. Larosa - 19 Aug 2026 Form 4 Insider Report for REGENERON PHARMACEUTICALS, INC. (REGN)
- Reporting relationship
- EVP General Counsel and Secret
- Issuer ticker
- REGN
- Reported as of
- 19 Aug 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 21 Aug 2026, 16:01:23 UTC
- Prior SEC filing
- 09 Dec 2025
- Source filing
- View source filing
- Reporting owner signature
- /s/ Joseph LaRosa
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
Joseph J. Larosa filed Form 4 for REGENERON PHARMACEUTICALS, INC. (REGN) on 21 Aug 2026.
Change
- Previous filing in this sequence was filed on 09 Dec 2025.
- Current net transaction value: $0.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0001238303
Primary reporting owner
LAROSA JOSEPH J
- Relationship
- EVP General Counsel and Secret
- Address
- 777 OLD SAW MILL RIVER ROAD, TARRYTOWN
- Signature
- /s/ Joseph LaRosa
- Signature date
- 21 Aug 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
REGN
transaction
Common Stock
Options Exercise
- Transaction value
- Shares
- +12,282
- Change %
- +37%
- Price
- $381.92*
- Shares after
- 45,392
- Date
- 19 Aug 2026
- Ownership
- Direct
REGN
transaction
Common Stock
Tax liability
- Transaction value
- Shares
- -9,019
- Change %
- -20%
- Price
- $830.15*
- Shares after
- 36,373
- Date
- 19 Aug 2026
- Ownership
- Direct
REGN
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 3,402
- Date
- 19 Aug 2026
- Ownership
- By 2024 GRAT
REGN
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 5,407
- Date
- 19 Aug 2026
- Ownership
- By 2025 GRAT
REGN
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 413
- Date
- 19 Aug 2026
- Ownership
- By 401(k) Plan
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
REGN
transaction
Derivative
Non-Qualified Stock Option (right to buy)
Options Exercise
- Transaction value
- Shares
- -12,282
- Change %
- -50%
- Price
- $0.000000*
- Shares after
- 12,283
- Date
- 19 Aug 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 12,282
- Exercise price
- $381.92
- Footnotes
- F1
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 1 footnote
Footnote F1
The stock option award vested in four equal annual installments, commencing one year after the date of grant.