Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
1,355 institutional managers reported holding REGN for the quarter ended Mar 31, 2026. Together they hold about 78% of shares outstanding; the top 10 hold 38%. 126 opened new positions; 130 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 9.41M | 8.74% | $7.27B | added +3.6% | ≤2013 |
| BlackRock | 8.95M | 8.31% | $6.91B | added +2.4% | ≤2013 |
| State Street | 4.66M | 4.33% | $3.60B | unchanged | ≤2013 |
| Dodge & Cox | 4.46M | 4.14% | $3.44B | trimmed -3% | 2021 Q4 |
| Franklin Resources | 2.72M | 2.53% | $2.10B | added +6.3% | ≤2013 |
| Geode Capital | 2.61M | 2.42% | $2.01B | added +3.5% | ≤2013 |
| T. Rowe Price | 2.18M | 2.02% | $1.68B | added +11.7% | ≤2013 |
| Nuveen | 2.07M | 1.92% | $1.59B | added +2.7% | ≤2013 |
| Loomis Sayles & CO L P | 1.91M | 1.78% | $1.48B | trimmed -1.1% | 2016 Q3 |
| Wellington Management | 1.84M | 1.71% | $1.42B | added +176.5% | ≤2013 |
| Invesco | 1.72M | 1.60% | $1.33B | added +8.4% | ≤2013 |
| FMR (Fidelity) | 1.52M | 1.41% | $1.17B | trimmed -34.5% | ≤2013 |
| Capital Group (American Funds) | 1.42M | 1.32% | $1.10B | added +1.5% | ≤2013 |
| Morgan Stanley | 1.32M | 1.23% | $1.02B | trimmed -5% | ≤2013 |
| Goldman Sachs | 1.30M | 1.21% | $1.00B | added +18.5% | ≤2013 |
| AQR Capital | 1.23M | 1.14% | $950.7M | added +23.6% | ≤2013 |
| Bank OF America CORP /DE/ | 1.19M | 1.10% | $918.8M | added +2.8% | ≤2013 |
| UBS | 1.02M | 0.95% | $790.6M | added +0.7% | ≤2013 |
| Amundi | 1.01M | 0.94% | $779.9M | added +27.5% | 2017 Q4 |
| Northern Trust | 941.9k | 0.88% | $727.5M | unchanged | ≤2013 |
| Two Sigma | 812.2k | 0.75% | $627.3M | added +188.9% | 2022 Q4 |
| Charles Schwab Investment Management | 804.5k | 0.75% | $621.3M | added +3.4% | ≤2013 |
| BNY Mellon | 765.4k | 0.71% | $591.1M | unchanged | ≤2013 |
| Legal & General Group PLC | 732.1k | 0.68% | $565.4M | trimmed -1.5% | ≤2013 |
| BNP Paribas Financial Markets | 722.4k | 0.67% | $558.0M | added +5% | ≤2013 |
| Deutsche Bank AG\ | 625.4k | 0.58% | $483.0M | trimmed -18.1% | ≤2013 |
| American Century Companies INC | 562.1k | 0.52% | $434.1M | added +1.9% | ≤2013 |
| Dimensional Fund Advisors | 513.1k | 0.48% | $396.3M | added +2.7% | ≤2013 |
| Neuberger Berman Group LLC | 427.1k | 0.40% | $329.9M | added +1.2% | ≤2013 |
| AllianceBernstein | 426.9k | 0.40% | $329.7M | trimmed -10.8% | ≤2013 |
| Manufacturers Life Insurance Company, THE | 408.9k | 0.38% | $315.8M | trimmed -2.9% | ≤2013 |
| National Pension Service | 371.6k | 0.34% | $287.0M | added +2.9% | 2014 Q3 |
| Royal Bank OF Canada | 351.2k | 0.33% | $271.2M | added +1.7% | ≤2013 |
| TD Asset Management INC | 350.9k | 0.33% | $271.0M | trimmed -11.7% | ≤2013 |
| Voya Investment Management LLC | 349.9k | 0.33% | $270.2M | added +19% | ≤2013 |
| Robeco Institutional Asset Management B.v. | 348.8k | 0.32% | $269.4M | added +33.2% | ≤2013 |
| First Trust Advisors LP | 346.9k | 0.32% | $267.9M | added +68.6% | ≤2013 |
| Pictet Asset Management Holding SA | 337.3k | 0.31% | $260.5M | trimmed -8.3% | ≤2013 |
| Caisse de depot et placement du Quebec | 329.0k | 0.30% | $254.1M | trimmed -3.9% | ≤2013 |
| Hsbc Holdings PLC | 323.3k | 0.30% | $249.7M | added +1.4% | ≤2013 |
| Ameriprise Financial INC | 319.7k | 0.30% | $246.9M | added +9.5% | ≤2013 |
| Man Group | 315.2k | 0.29% | $243.4M | added +44.5% | 2018 Q1 |
| Barclays PLC | 313.1k | 0.29% | $241.8M | added +0.6% | ≤2013 |
| FIL LTD | 309.5k | 0.29% | $239.0M | trimmed -41.5% | 2019 Q1 |
| Swiss National Bank | 303.1k | 0.28% | $234.1M | added +6.2% | ≤2013 |
| Allianz Asset Management GmbH | 301.2k | 0.28% | $232.6M | added +77.7% | ≤2013 |
| Mitsubishi UFJ Asset Management CO., LTD. | 291.4k | 0.27% | $225.0M | added +6.4% | ≤2013 |
| Bellevue Group AG | 278.7k | 0.26% | $215.2M | added +1897.1% | 2019 Q4 |
| Sumitomo Mitsui Trust Group, INC. | 273.7k | 0.25% | $211.4M | trimmed -4% | ≤2013 |
| Federated Hermes, INC. | 254.9k | 0.24% | $196.9M | added +3.4% | ≤2013 |
Largest 50 of 1,355 shown; the full ranked, searchable register is at boothcheck.com/holders/REGN. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.