Regeneron Pharmaceuticals's three largest insider shareholders as of September 23, 2026 are P Roy Vagelos (Chairman Of The Board, 312.58K shares), George Yancopoulos (Bd. Co Chair, President Cso, 310.46K shares), Leonard S Schleifer (Bd. Co Chair, President Ceo, 214.52K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | George Yancopoulos | Bd. Co Chair, President Cso | 310,460 | 0 | 310,460 | 33.1% | 05 Jan, 2026 |
| 2 | Leonard S Schleifer | Bd. Co Chair, President Ceo | 214,523 | 0 | 214,523 | 22.9% | 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 | Evp Research | 47,833 | 0 | 47,833 | 5.1% | 11 Dec, 2025 |
| 6 | Joseph J Larosa | Evp General Counsel And Secret | 36,373 | 0 | 36,373 | 3.9% | 21 Aug, 2026 |
| 7 | George L Sing | Director | 31,007 | 0 | 31,007 | 3.3% | 06 Jan, 2026 |
| 8 | Robert E Landry | Evp Finance Cfo | 23,693 | 0 | 23,693 | 2.5% | 06 Feb, 2024 |
| 9 | Plew Daniel P Van | Evp General Mgr, Industrial | 21,673 | 0 | 21,673 | 2.3% | 11 Dec, 2025 |
| 10 | Christopher R. Fenimore | Evp Finance Cfo | 19,984 | 0 | 19,984 | 2.1% | 20 Aug, 2026 |
| 11 | Arthur F Ryan | Director | 17,303 | 0 | 17,303 | 1.8% | 07 Jul, 2026 |
| 12 | Marion Mccourt | Evp Commercial | 12,003 | 0 | 12,003 | 1.3% | 03 Sep, 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% | 06 Jan, 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 | 1,703 | 0 | 1,703 | 0.2% | 06 Jan, 2026 |
| 21 | Craig B. Thompson | Director | 775 | 0 | 775 | 0.1% | 06 Jan, 2026 |
| 22 | Kathryn Guarini | Director | 603 | 0 | 603 | 0.1% | 03 Sep, 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.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 02 Sep, 2026 | Marion Mccourt | Evp Commercial | Disposed S | 1,215 | $850.00 | $1.03Mn | 13,134 | Direct |
| 02 Sep, 2026 | Kathryn Guarini | Director | Acquired M | 400 | $719.37 | $287.75K | 1,003 | Direct |
| 02 Sep, 2026 | Kathryn Guarini | Director | Disposed S | 400 | $850.00 | $340.00K | 603 | Direct |
| 03 Sep, 2026 | Marion Mccourt | Evp Commercial | Disposed S | 1,131 | $857.39 | $969.71K | 12,003 | Direct |
| 02 Sep, 2026 | Kathryn Guarini | Director | Disposed M | 400 | $0.00 | $0 | 1,158 | Direct |
| 19 Aug, 2026 | Joseph J Larosa | Evp General Counsel And Secret | Acquired M | 12,282 | $381.92 | $4.69Mn | 45,392 | Direct |
| 19 Aug, 2026 | Joseph J Larosa | Evp General Counsel And Secret | Disposed F | 9,019 | $830.15 | $7.49Mn | 36,373 | Direct |
| 19 Aug, 2026 | Joseph J Larosa | Evp General Counsel And Secret | Disposed M | 12,282 | $0.00 | $0 | 12,283 | Direct |
| 18 Aug, 2026 | Christopher R. Fenimore | Evp Finance Cfo | Acquired M | 6,283 | $381.92 | $2.40Mn | 24,583 | Direct |
| 18 Aug, 2026 | Christopher R. Fenimore | Evp Finance Cfo | Disposed F | 4,599 | $813.47 | $3.74Mn | 19,984 | Direct |
| 18 Aug, 2026 | Christopher R. Fenimore | Evp Finance Cfo | Disposed M | 6,283 | $0.00 | $0 | 6,000 | Direct |
| 10 Aug, 2026 | Huda Y Zoghbi | Director | Acquired M | 800 | $376.69 | $301.35K | 2,503 | Direct |
| 10 Aug, 2026 | Kathryn Guarini | Director | Acquired M | 400 | $719.37 | $287.75K | 1,003 | Direct |
| 10 Aug, 2026 | Huda Y Zoghbi | Director | Disposed S | 800 | $800.00 | $640.00K | 1,703 | Direct |
| 10 Aug, 2026 | Kathryn Guarini | Director | Disposed S | 400 | $800.00 | $320.00K | 603 | Direct |
| 10 Aug, 2026 | Kathryn Guarini | Director | Disposed M | 400 | $0.00 | $0 | 1,558 | Direct |
| 10 Aug, 2026 | Huda Y Zoghbi | Director | Disposed M | 800 | $0.00 | $0 | 0 | Direct |
| 02 Jul, 2026 | Arthur F Ryan | Director | Disposed S | 200 | $650.15 | $130.03K | 17,303 | Direct |
| 01 May, 2026 | Arthur F Ryan | Director | Disposed S | 5 | $701.76 | $3.51K | 17,598 | Direct |
| 01 May, 2026 | Arthur F Ryan | Director | Disposed S | 15 | $702.46 | $10.54K | 17,583 | Direct |