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: 05 Jan 2026, 17:53.
Leonard S. Schleifer - 31 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
- 31 Dec 2025
- Net transaction value
- -$22,058,611
- SEC form
- 4
- Accepted by SEC
- 05 Jan 2026, 17:53:17 UTC
- Prior SEC filing
- 11 Dec 2025
- Source filing
- View source filing
- Reporting owner signature
- /s/ Leonard S. Schleifer
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
Leonard S. Schleifer filed Form 4 for REGENERON PHARMACEUTICALS, INC. (REGN) on 05 Jan 2026.
Change
- Previous filing in this sequence was filed on 11 Dec 2025.
- Current net transaction value: -$22,058,611.
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
- 05 Jan 2026
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
REGN
transaction
Common Stock
Options Exercise
- Transaction value
- $0
- Shares
- +28,570
- Change %
- +13%
- Price
- $0.000000
- Shares after
- 243,093
- Date
- 31 Dec 2025
- Ownership
- Direct
REGN
transaction
Common Stock
Tax liability
- Transaction value
- $22,058,611
- Shares
- -28,570
- Change %
- -12%
- Price
- $772.09
- Shares after
- 214,523
- Date
- 31 Dec 2025
- Ownership
- Direct
REGN
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 127,484
- Date
- 31 Dec 2025
- Ownership
- By 2024 GRAT
REGN
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 300,000
- Date
- 31 Dec 2025
- Ownership
- By 2025 GRAT
REGN
holding
Common Stock
No transaction description listed
- Transaction value
- Shares
- Change %
- Price
- Shares after
- 5,989
- Date
- 31 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
- 31 Dec 2025
- Ownership
- By Trust
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
REGN
transaction
Derivative
2020 Performance Stock Units
Options Exercise
- Transaction value
- $0
- Shares
- -28,570
- Change %
- -4.6%
- Price
- $0.000000
- Shares after
- 595,077
- Date
- 31 Dec 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 28,570
- Exercise price
- 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
Each performance restricted stock unit ("PSU") represents a contingent right to receive one share of Company stock. These PSUs were earned during the applicable five-year performance period and vested on December 31, 2025 but remain subject to a mandatory holding period of three years after vesting, which ends early upon the reporting person's death or disability or a change in control of the Company.