Regeneron Pharmaceuticals REGN Insider Ownership

NASDAQ REGN

$902.90 -27.77 (-2.98%)

At close: Nov 5, 2026 · 4:00 PM EST

Insider Holdings by Owner

933.57K Shares

George Yancopoulos310.46K33.3%

Leonard S Schleifer214.52K23.0%

P Roy Vagelos125.49K13.4%

Neil Stahl48.83K5.2%

Andrew J Murphy47.83K5.1%

Other insiders (18)186.43K20.0%

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

0.781%

▲+0.0015% pp QoQ

Shares Held by Insiders

1.08Mn

filed for Sep 2026

▲+0.56% QoQ

Shares Outstanding

138.50Mn

138,500,000 shares

Direct Holdings

784.99K

Indirect: 296.08K

Net Open-Market Trades

-4.15K

net sold · -$3.43Mn in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Open-Market Insider Trades

Bought Sold

Latest quarter —

Net over range —

Net-buying quarters —

Insider Ownership Summary

Updated Nov 4, 2026

Over the trailing 12 months, REGN insiders sold $14.89 million worth of shares (18.52K shares) in open-market trades, with no open-market purchases.

Counted by insider, open-market selling of REGN stock in the past 12 months came from 8 insiders, with no insider buying.
Andrew J. Murphy (Co-Chief Scientific Officer) was the top open-market seller of Regeneron Pharmaceuticals over the past 12 months, with $3.2 million sold (4.15K shares) and the latest sale on October 14, 2026.
Michael S. Brown (Director) made the most recent open-market trade by an insider of Regeneron Pharmaceuticals, a sale of 1.93K shares for $1.69 million on October 30, 2026.
Apart from open-market trades, REGN insiders received 11.44K shares in stock awards, acquired 416.16K shares through option exercises and conversions and gave up 377.05K shares to cover taxes or exercise prices in the past 12 months.
Per Business Quant data, Regeneron Pharmaceuticals insiders hold 1.08Mn shares in total based on their latest Form 4 filings, up 0.45% from 1.08Mn shares at the end of Q2 2026.
By type of ownership, REGN insiders hold 72.55% of their shares directly (783.53K shares) and 27.45% indirectly (296.4K shares).
REGN's insider total is spread across 20 insiders who have filed a Form 4 in the past two years.
REGN's three largest insider shareholders, per their latest Form 4 filings, are George Yancopoulos (Board Co Chair, President & CSO, 546.51K shares), Leonard S. Schleifer (Board Co Chair, President & CEO, 254.51K shares) and Neil Stahl (EVP Research and Development, 53.43K shares).
The holding of George Yancopoulos makes up 50.61% of all shares held by Regeneron Pharmaceuticals insiders.
Institutional holders reported 66.16% of Regeneron Pharmaceuticals' outstanding shares for Q2 2026; insiders' latest Form 4 filings put their stake at about 0.78%, and other investors, including the public, hold the remaining 33.06%.
A total of 46 Form 4 filings with transactions in Regeneron Pharmaceuticals stock were made over the past 12 months, by 19 insiders.
This summary of Regeneron Pharmaceuticals insider activity covers Form 4 filings through November 3, 2026.

Form 4 Holdings

Insiders Holding REGN

Insiders 23

Shares held 933.57K

Of outstanding 0.674%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	George Yancopoulos	Bd. Co Chair, President Cso	310,460	0	310,460	33.3%	05 Jan, 2026
2	Leonard S Schleifer	Bd. Co Chair, President Ceo	214,523	0	214,523	23.0%	05 Jan, 2026
3	P Roy Vagelos	Chairman Of The Board	0	125,493	125,493	13.4%	05 Apr, 2023
4	Neil Stahl	Evp Research And Development	48,829	0	48,829	5.2%	18 Dec, 2024
5	Andrew J Murphy	Co Chief Scientific Officer	47,833	0	47,833	5.1%	15 Oct, 2026
6	Joseph J Larosa	Evp General Counsel And Secret	38,906	0	38,906	4.2%	04 Nov, 2026
7	George L Sing	Director	25,147	0	25,147	2.7%	04 Nov, 2026
8	Robert E Landry	Evp Finance Cfo	23,693	0	23,693	2.5%	06 Feb, 2024
9	Christopher R. Fenimore	Evp Finance Cfo	21,726	0	21,726	2.3%	04 Nov, 2026
10	Plew Daniel P Van	Evp General Mgr, Industrial	21,673	0	21,673	2.3%	11 Dec, 2025
11	Arthur F Ryan	Director	17,303	0	17,303	1.9%	07 Jul, 2026
12	Marion Mccourt	Evp Commercial	10,871	0	10,871	1.2%	03 Nov, 2026
13	Joseph L Goldstein	Director	6,703	0	6,703	0.7%	06 Jan, 2026
14	Christine A Poon	Director	5,219	0	5,219	0.6%	04 Nov, 2026
15	Jason Pitofsky	Svp Controller	4,272	0	4,272	0.5%	11 Feb, 2026
16	Marc Tessier-Lavigne	Director	2,434	0	2,434	0.3%	05 Jan, 2023
17	N Anthony Coles	Director	1,714	0	1,714	0.2%	06 Jan, 2026
18	Huda Y Zoghbi	Director	1,703	0	1,703	0.2%	12 Aug, 2026
19	Bonnie L Bassler	Director	1,703	0	1,703	0.2%	08 Jan, 2026
20	Michael S Brown	Director	1,380	0	1,380	0.1%	03 Nov, 2026
21	Craig B. Thompson	Director	775	0	775	0.1%	06 Jan, 2026
22	Kathryn Guarini	Director	603	0	603	0.1%	03 Nov, 2026
23	David P Schenkein	Director	603	0	603	0.1%	06 Jan, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

8,232 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
02 Nov, 2026	Christine A Poon	Director	Acquired M	7,830	$376.69	$2.95Mn	13,049	Direct
02 Nov, 2026	Christopher R. Fenimore	Evp Finance Cfo	Acquired M	6,000	$381.92	$2.29Mn	25,984	Direct
02 Nov, 2026	Joseph J Larosa	Evp General Counsel And Secret	Acquired M	12,283	$381.92	$4.69Mn	52,058	Direct
02 Nov, 2026	George L Sing	Director	Acquired M	7,830	$376.69	$2.95Mn	38,837	Direct
02 Nov, 2026	George L Sing	Director	Acquired M	7,439	$380.95	$2.83Mn	46,276	Direct
02 Nov, 2026	Christine A Poon	Director	Disposed S	218	$966.74	$210.75K	12,831	Direct
02 Nov, 2026	Christopher R. Fenimore	Evp Finance Cfo	Disposed F	4,243	$950.50	$4.03Mn	21,741	Direct
02 Nov, 2026	Joseph J Larosa	Evp General Counsel And Secret	Disposed F	8,686	$950.50	$8.26Mn	43,372	Direct
02 Nov, 2026	Christopher R. Fenimore	Evp Finance Cfo	Disposed G	15	$0.00	$0	21,726	Direct
02 Nov, 2026	Christine A Poon	Director	Disposed S	772	$967.38	$746.82K	12,059	Direct
02 Nov, 2026	George L Sing	Director	Disposed S	1,224	$960.57	$1.18Mn	45,052	Direct
02 Nov, 2026	Joseph J Larosa	Evp General Counsel And Secret	Disposed S	3,939	$965.41	$3.80Mn	39,433	Direct
02 Nov, 2026	Joseph J Larosa	Evp General Counsel And Secret	Disposed S	527	$966.11	$509.14K	38,906	Direct
02 Nov, 2026	Christine A Poon	Director	Disposed S	2,499	$968.58	$2.42Mn	9,560	Direct
02 Nov, 2026	George L Sing	Director	Disposed S	540	$961.85	$519.40K	44,512	Direct
02 Nov, 2026	Christine A Poon	Director	Disposed S	3,203	$969.50	$3.11Mn	6,357	Direct
02 Nov, 2026	George L Sing	Director	Disposed S	2,522	$962.61	$2.43Mn	41,990	Direct
02 Nov, 2026	Christine A Poon	Director	Disposed S	937	$970.51	$909.37K	5,420	Direct
02 Nov, 2026	George L Sing	Director	Disposed S	4,338	$963.47	$4.18Mn	37,652	Direct
02 Nov, 2026	Joseph J Larosa	Evp General Counsel And Secret	Disposed M	12,283	$0.00	$0	0	Direct

Showing 1 to 20 of 8,232 transactions