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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 $289.6M 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.

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Disclosed Exposure

$289.60M

Companies

1

Total Filings

53

Lifetime Open-Market Net

-$458.80M

Filer Profile

Reported Address
777 OLD SAW MILL RIVER ROAD
TARRYTOWN, NY 10591
Related Filers
REGENERON PHARMACEUTICALS, INC. — 72 joint filings, latest 2026-01-05
Profile details as reported on the filer's SEC submissions — for individual insiders the address is often in care of the issuer. Related filers are identified from jointly filed SEC submissions and shared reported addresses. View filings on SEC EDGAR.

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.
Symbol Role Shares Price Disclosed Exposure Lifetime OM Net Filings Latest Filed
REGN Bd. Co-Chair, President & CEO 370,577 $781.49 $289.60M -$458.80M 50 2026-01-05

Recent Filings

53 filings
Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.
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
Showing 1–10 of 53
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Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
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.