Transactions
6
Insider / REGENERON PHARMACEUTICALS, INC.
SCHLEIFER LEONARD S
Bd. Co-Chair, President & CEO at REGENERON PHARMACEUTICALS, INC.
- Ticker
- REGN
- First filing on record
- December 11, 2025
- Latest trade on record
- December 31, 2025
- SEC filings
- EDGAR ↗
SCHLEIFER LEONARD S, Bd. Co-Chair, President & CEO at REGENERON PHARMACEUTICALS, INC., has disclosed 6 transactions in REGN since December 11, 2025: 0 purchases (0 open-market buys) and 2 sales, worth about $226.9M at the reported prices. The latest was filed January 5, 2026, 5 days after the trade; 3 filings were late against the 2-business-day Form 4 deadline.
Open-market buys
0
Sales
2
Avg. disclosure lag
3.5d
Trading in charts
Trade timeline
When does this person trade, how big, and in which direction? Every trade in the last 12 months.
Bought (above the line)Sold (below the line)Other transaction
In the last 12 months SCHLEIFER LEONARD S made no purchases and 2 sales worth $131M, plus 4 other transactions. Dot size is the dollar amount.
Portfolio mix
Which stocks does this person trade most? Tile size is dollars traded, all time on record.
SCHLEIFER LEONARD S has traded 1 stock on record; the largest by dollars is REGN.
Reporting lag
Does this person report on time? One bar per filing against the Form 4 deadline.
On timeLate
1 of 2 filings on record were reported after the Form 4 deadline (two business days, counted here as 4 calendar days).
What kind of transactions
Most Form 4 rows are pay arriving or tax being withheld, not a decision to buy or sell. Only code P is an open-market purchase and code S an open-market sale. What each code means: Form 4 transaction codes.
| Code | Meaning | Rows | Shares | Value |
|---|---|---|---|---|
| M | Option exercise or conversion | 4 | 402,586 | $96.0M |
| F | Shares withheld for tax | 2 | 183,715 | $130.9M |
| Year | Rows | Bought | Sold |
|---|---|---|---|
| 2025 | 6 | 0 | 2 · $130.9M |
Transactions
| Security | Side | Trade date | Disclosed | Lag | Shares | Price | Value | Flags | Source | Share |
|---|---|---|---|---|---|---|---|---|---|---|
| REGN | Option / conversion M | December 31, 2025 | January 5, 2026 | 5d | 28,570 | — | — | latederivative | Form 4 ↗ | |
| REGN | Sell F | December 31, 2025 | January 5, 2026 | 5d | 28,570 | $772 | $22.1M | late | Form 4 ↗ | |
| REGN | Option / conversion M | December 31, 2025 | January 5, 2026 | 5d | 28,570 | — | — | late | Form 4 ↗ | |
| REGN | Option / conversion M | December 9, 2025 | December 11, 2025 | 2d | 172,723 | — | — | derivative | Form 4 ↗ | |
| REGN | Sell F | December 9, 2025 | December 11, 2025 | 2d | 155,145 | $702 | $108.8M | Form 4 ↗ | ||
| REGN | Option / conversion M | December 9, 2025 | December 11, 2025 | 2d | 172,723 | $556 | $96.0M | Form 4 ↗ |
Filings
| Filed | Form | Accession | Rows | Status | Source |
|---|---|---|---|---|---|
| January 5, 2026 | Form 4 | 0001218629-26-000002 | 3 | published | EDGAR ↗ |
| December 11, 2025 | Form 4 | 0001218629-25-000006 | 3 | published | EDGAR ↗ |
Other insiders at REGENERON PHARMACEUTICALS, INC.
- RYAN ARTHUR F Director 50 rows
- MURPHY ANDREW J EVP Research 38 rows
- POON CHRISTINE A Director 28 rows
- Sanofi Insider 24 rows
- Zoghbi Huda Y Director 18 rows
- Pitofsky Jason SVP Controller 17 rows
- LAROSA JOSEPH J EVP General Counsel and Secret 9 rows
- Bassler Bonnie L Director 8 rows
- Guarini Kathryn Director 8 rows
- Fenimore Christopher R. EVP Finance CFO 6 rows
Everyone on file, with contracts and lobbying under the company's name: REGENERON PHARMACEUTICALS, INC..
Guides for this page
- What is SEC Form 4? Who files: officers, directors and owners of more than 10% of a class of the company's shares.
- Form 4 transaction codes P = purchase. S = sale. These are the two market trades.
- Insider buying vs insider selling Selling outweighs buying by a wide margin in normal times.
- Options and derivatives on Form 4 Table I = shares. Table II = options and other derivatives.
- What disclosure data cannot tell you Filings are late by design: up to 45 days for Congress, two business days for insiders.
Sources and method
| Source | Filings | Rows | First filed | Newest filed | Read the originals |
|---|---|---|---|---|---|
| SEC EDGAR, Form 4 | 2 | 6 | December 11, 2025 | January 5, 2026 | Form 4 list on EDGAR |
Site built October 22, 2026. Every row in the tables above links to its own filing. To quote a figure, use the Cite button at the top of the page; see how to cite and reuse.
Every row comes from the reporting owner's Form 4 as filed with the SEC (EDGAR ownership XML), read daily. "Value" is shares × the reported price; code P is an open-market purchase, S a sale, M an option exercise, A a grant. The lag is the filing date minus the trade date; Form 4 is due within two business days. Amendments (4/A) are not merged. Details on the methodology page; report an error on corrections.
Not investment advice. Figures are public disclosures shown as filed; they may lag the trade and may be amended later. No recommendation is made or implied.