Leonard S Schleifer
CIK 1218629 · Bd. Co-Chair, President & CEO · last filed 2026-01-05
Leonard S Schleifer is a Bd. Co-Chair, President & CEO who has filed 53 SEC Form 4 insider transactions across 1 company since 2007. The most recent filing, for REGN, was dated Jan 5, 2026. Across all open-market trades the lifetime net is −$458.8M, making them a net seller over the disclosed history. Current disclosed insider exposure totals $301.4M across reported positions. 72 SEC filings were submitted jointly with REGENERON PHARMACEUTICALS, INC.
"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.
Charts
Trading activity, where the exposure sits, and each trade against the stock price.
REGN price and trades
Daily close with each Form 4 filing on this company marked: green = open-market buy, red = open-market sale, purple = grants, exercises, gifts and other non-market transactions. Marker size scales with the dollar value.
Shares held
Shares owned after each reported transaction on this company (direct holdings as reported).
Open-market buying and selling
by monthDollar value of open-market purchases (code P, up) and sales (code S, down) across all companies, by filing month. Grants, exercises and gifts are excluded.
Exposure by company
latestMost recently reported shares × current price. Faded bars (*) have had no filing in 3 years, so the person may no longer hold them. Click a bar to chart that company.
Filer Profile
TARRYTOWN, NY 10591
Holdings By Company
| Symbol | Role | Shares | Price | Disclosed Exposure | Lifetime OM Net | Filings | Latest Filed |
|---|---|---|---|---|---|---|---|
| REGN | Bd. Co-Chair, President & CEO | 370,577 | $813.27 | $301.38M | -$458.80M | 50 | 2026-01-05 |
Recent Filings
53 filings| Filed | Symbol | Action | Net Shares | Net $ | Link |
|---|---|---|---|---|---|
| 2026-01-05 | REGN | Mixed | — | -$22.06M | EDGAR |
| 2025-12-11 | REGN | Mixed | +17,578 | -$12.86M | EDGAR |
| 2024-06-13 | REGN | Mixed | −24,213 | -$25.61M | EDGAR |
| 2024-06-12 | REGN | Notice (144) | −1,000 | -$1.03M | EDGAR |
| 2024-06-10 | REGN | Sell (S) | −787 | -$798.8K | EDGAR |
| 2024-06-06 | REGN | Notice (144) | −25,000 | -$25.13M | EDGAR |
| 2024-05-17 | REGN | Sell (S) | −22,830 | -$22.36M | EDGAR |
| 2024-05-15 | REGN | Mixed | +22,830 | -$95.08M | EDGAR |
| 2024-05-14 | REGN | Notice (144) | −58,771 | -$57.60M | EDGAR |
| 2023-12-13 | REGN | Mixed | +12,314 | -$10.84M | EDGAR |
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.