Key facts
- This page summarizes Leonard S. Schleifer's Form 4 filing for REGENERON PHARMACEUTICALS, INC. (REGN).
- 3 reported transactions and 1 derivative row are listed below.
- Accepted by SEC: 11 Dec 2025, 16:23.
Leonard S. Schleifer - 09 Dec 2025 Form 4 Insider Report for REGENERON PHARMACEUTICALS, INC. (REGN)
- Reporting relationship
- Bd. Co-Chair, President & CEO, Director
- Issuer ticker
- REGN
- Reported as of
- 09 Dec 2025
- Net transaction value
- -$12,858,780
- SEC form
- 4
- Accepted by SEC
- 11 Dec 2025, 16:23:04 UTC
- Prior SEC filing
- 13 Jun 2024
- Next SEC filing
- 05 Jan 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Leonard S. Schleifer
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Leonard S. Schleifer filed Form 4 for REGENERON PHARMACEUTICALS, INC. (REGN) on 11 Dec 2025.
Change
- Previous filing in this sequence was filed on 13 Jun 2024.
- Current net transaction value: -$12,858,780.
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 0001218629
Primary reporting owner
SCHLEIFER LEONARD S
- Relationship
- Bd. Co-Chair, President & CEO, Director
- Address
- 777 OLD SAW MILL RIVER ROAD, TARRYTOWN
- Signature
- /s/ Leonard S. Schleifer
- Signature date
- 11 Dec 2025
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
REGN
transaction
Common Stock
Options Exercise
- Transaction value
- $95,976,989
- Shares
- +172,723
- Change %
- +88%
- Price
- $555.67
- Shares after
- 369,668
- Date
- 09 Dec 2025
- Ownership
- Direct
REGN
transaction
Common Stock
Tax liability
- Transaction value
- $108,835,769
- Shares
- -155,145
- Change %
- -42%
- Price
- $701.51
- Shares after
- 214,523
- Date
- 09 Dec 2025
- Ownership
- Direct
REGN
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 127,484
- Date
- 09 Dec 2025
- Ownership
- By 2024 GRAT
REGN
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 300,000
- Date
- 09 Dec 2025
- Ownership
- By 2025 GRAT
REGN
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 5,989
- Date
- 09 Dec 2025
- Ownership
- By 401(k) Plan
REGN
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 39,985
- Date
- 09 Dec 2025
- Ownership
- By Trust
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
- $0
- Shares
- -172,723
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 09 Dec 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 172,723
- Exercise price
- $555.67
- 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.