Regeneron Pharmaceuticals
REGN · NASDAQ
Who owns REGN
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 36.1% of REGN’s shares.
- Vanguard Capital Management, LLC6.3%
- BlackRock Institutional Trust Company, N.A.5.2%
- Dodge & Cox4.6%
- State Street Investment Management (US)4.6%
- Next 6 largest institutions15.3%
- All other shareholders63.9%
| Holder | Shares | % of shares |
|---|---|---|
| Vanguard Capital Management, LLC | 6.63M | 6.32% |
| BlackRock Institutional Trust Company, N.A. | 5.46M | 5.21% |
| Dodge & Cox | 4.87M | 4.65% |
| State Street Investment Management (US) | 4.83M | 4.61% |
| Invesco Capital Management LLC | 3.24M | 3.09% |
| Vanguard Portfolio Management, LLC | 3.18M | 3.03% |
| JP Morgan Asset Management | 2.81M | 2.68% |
| Geode Capital Management, L.L.C. | 2.63M | 2.50% |
| Putnam Investment Management, L.L.C. | 2.31M | 2.20% |
| Loomis, Sayles & Company, L.P. | 1.86M | 1.77% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Vanguard Total Stock Market Index Fund | 3.28M | 3.13% |
| Dodge & Cox Stock Fund | 3.12M | 2.98% |
| Vanguard 500 Index Fund | 2.62M | 2.50% |
| Invesco QQQ Trust | 2.22M | 2.11% |
| iShares Core S&P 500 ETF | 1.33M | 1.27% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $6.71M (45 trades) of REGN on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| MURPHY ANDREW J | Sale | 50 | $39.07K |
| MURPHY ANDREW J | Sale | 463 | $361.43K |
| MURPHY ANDREW J | Sale | 380 | $296.24K |
| MURPHY ANDREW J | Sale | 454 | $353.50K |
| MURPHY ANDREW J | Sale | 38 | $29.55K |
| MURPHY ANDREW J | Sale | 66 | $51.24K |
| MURPHY ANDREW J | Sale | 376 | $291.57K |
| MURPHY ANDREW J | Sale | 121 | $93.71K |
| MURPHY ANDREW J | Sale | 224 | $173.24K |
| MURPHY ANDREW J | Sale | 211 | $163.01K |
Congressional trades
Disclosed by members of Congress over the last 12 months
| Member | Type | Amount | Traded |
|---|---|---|---|
| Ro KhannaHouse | Purchase | $1K–$15K | Apr 13, 2026 |
| Alan ArmstrongSenator | Purchase | $1K–$15K | Mar 27, 2026 |
| Julia LetlowHouse | Purchase | $1K–$15K | Feb 12, 2026 |
| Gil CisnerosHouse | Purchase | $1K–$15K | Nov 18, 2025 |
| Ro KhannaHouse | Purchase | $1K–$15K | Nov 3, 2025 |
Short interest
Settled Sep 30, 2026
- Shares short
- 2.15M
- Days to cover
- 2.49
- % of shares outstanding
- 2.05%
- Average daily volume
- 863.84K
- Change since last report
- −14.9%
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