Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
425 institutional managers reported holding RGEN for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 52%. 58 opened new positions; 99 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 5.99M | 10.58% | $706.4M | trimmed -9.5% | ≤2013 |
| Vanguard Group | 5.12M | 9.04% | $603.6M | added +2.4% | ≤2013 |
| T. Rowe Price | 4.88M | 8.61% | $575.0M | added +6.1% | 2015 Q2 |
| FMR (Fidelity) | 2.89M | 5.09% | $340.3M | added +0.7% | ≤2013 |
| United Capital Financial Advisors, LLC | 2.77M | 4.89% | $327.0M | unchanged | 2025 Q3 |
| State Street | 1.78M | 3.14% | $209.5M | added +3.4% | ≤2013 |
| BNY Mellon | 1.53M | 2.70% | $180.5M | added +13.9% | ≤2013 |
| Maverick Capital | 1.52M | 2.68% | $179.0M | opened | 2026 Q1 |
| MFS Investment Management | 1.40M | 2.47% | $164.7M | added +15% | 2025 Q4 |
| T. Rowe Price Investment Management, INC. | 1.37M | 2.41% | $161.1M | added +3049.9% | 2022 Q3 |
| Invesco | 1.28M | 2.26% | $150.7M | added +1.7% | ≤2013 |
| Wasatch Advisors LP | 1.24M | 2.19% | $146.6M | opened | 2026 Q1 |
| RTW Investments, LP | 1.21M | 2.13% | $142.2M | added +13.3% | 2025 Q4 |
| Franklin Resources | 1.19M | 2.11% | $140.6M | added +8.3% | 2019 Q3 |
| Citadel Advisors | 1.10M | 1.94% | $129.6M | trimmed -21.2% | 2017 Q4 |
| Conestoga Capital Advisors, LLC | 1.10M | 1.94% | $129.4M | added +3.8% | 2014 Q2 |
| Geode Capital | 1.06M | 1.88% | $125.5M | added +3.4% | ≤2013 |
| Ameriprise Financial INC | 925.2k | 1.63% | $109.1M | added +87.2% | ≤2013 |
| Vestal Point Capital, LP | 925.0k | 1.63% | $109.0M | added +1014.5% | 2025 Q3 |
| Dimensional Fund Advisors | 854.7k | 1.51% | $100.7M | added +6.3% | ≤2013 |
| UBS | 834.1k | 1.47% | $98.3M | added +62.7% | 2013 Q4 |
| AllianceBernstein | 831.8k | 1.47% | $98.0M | trimmed -16.4% | ≤2013 |
| Congress Asset Management CO | 797.9k | 1.41% | $94.0M | added +6.9% | 2018 Q3 |
| Stephens Investment Management Group LLC | 755.6k | 1.33% | $89.1M | added +15% | 2015 Q2 |
| Holocene Advisors | 708.9k | 1.25% | $83.6M | trimmed -26.2% | 2024 Q4 |
| Champlain Investment Partners, LLC | 693.9k | 1.22% | $81.8M | trimmed -30.9% | 2022 Q3 |
| Geneva Capital Management LLC | 693.7k | 1.22% | $81.8M | added +23.2% | 2020 Q1 |
| Morgan Stanley | 683.8k | 1.21% | $80.6M | added +19.8% | ≤2013 |
| Goldman Sachs | 651.3k | 1.15% | $76.8M | added +120.6% | 2013 Q4 |
| First Trust Advisors LP | 630.1k | 1.11% | $74.3M | added +122.8% | 2018 Q3 |
| Voya Investment Management LLC | 622.9k | 1.10% | $73.4M | added +19.5% | 2014 Q2 |
| Point72 | 569.5k | 1.00% | $67.1M | trimmed -43.4% | 2018 Q3 |
| BNP Paribas Financial Markets | 554.5k | 0.98% | $65.4M | added +39.4% | 2014 Q1 |
| Bamco INC /NY/ | 548.3k | 0.97% | $64.6M | added +0.7% | 2022 Q3 |
| Schroder Investment Management Group | 520.1k | 0.92% | $61.3M | added +17.2% | 2025 Q2 |
| TimesSquare Capital Management, LLC | 456.1k | 0.81% | $53.8M | added +4.7% | 2023 Q1 |
| Charles Schwab Investment Management | 453.0k | 0.80% | $53.4M | added +5.2% | ≤2013 |
| Northern Trust | 444.7k | 0.79% | $52.4M | unchanged | ≤2013 |
| Impax Asset Management Group plc | 438.5k | 0.77% | $51.7M | added +6.1% | 2020 Q1 |
| Fred Alger Management, LLC | 434.8k | 0.77% | $51.2M | trimmed -52.3% | 2017 Q2 |
| Thrivent Financial for Lutherans | 425.4k | 0.75% | $50.1M | added +3.3% | 2014 Q2 |
| Artemis Investment Management LLP | 421.8k | 0.74% | $49.7M | added +2.8% | 2023 Q4 |
| Blue Whale Capital LLP (focused) | 404.2k | 0.71% | $47.6M | added +31% | 2025 Q2 |
| Bank OF America CORP /DE/ | 378.2k | 0.67% | $44.6M | trimmed -4.8% | ≤2013 |
| DF Dent & CO INC | 365.1k | 0.64% | $43.0M | trimmed -26.3% | 2020 Q1 |
| American Capital Management INC | 357.7k | 0.63% | $42.2M | added +6.7% | 2018 Q3 |
| Perceptive Advisors LLC | 280.5k | 0.49% | $33.1M | trimmed -11.1% | 2025 Q1 |
| Allspring Global Investments Holdings, LLC | 280.5k | 0.49% | $33.1M | trimmed -9.9% | 2021 Q4 |
| SEI Investments CO | 272.1k | 0.48% | $32.1M | added +49.5% | 2016 Q2 |
| Riverbridge Partners LLC | 258.5k | 0.46% | $30.5M | trimmed -17.5% | 2023 Q2 |
Largest 50 of 425 shown; the full ranked, searchable register is at boothcheck.com/holders/RGEN. 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.