Repligen Corporation (RGEN) Shareholders & Insider Trades
Repligen shareholders at a glance
The largest holder of Repligen stock is BlackRock Advisors LLC, with 5.7 million shares (10.05% of the company), worth about $671.00 million as of May 18, 2026. The 10 largest holders together own 50.4%.
In Q2 2026, 501 institutional holdings reports listed shares worth $9.07 billion.
Insiders reported 50 transactions in the last two years: 10 sales worth $23.37 million and 2 purchases. The newest one on file is from May 14, 2026 (Mhatre Rohin, Director).
Major holders as of May 18, 2026; quarterly totals from institutional holdings reports (latest Q2 2026); insider transactions on file through May 14, 2026.
Repligen Corporation
Shareholders Summary
2026Q2
Ownership by Type
Geographic Distribution
Largest Repligen shareholders
| Holder | Shares | % of company | Value |
|---|---|---|---|
| BlackRock Advisors LLC | 5.7 million | 10.05% | $671.0M |
| T. Rowe Price International Ltd. | 4.9 million | 8.65% | $577.0M |
| Fidelity Management & Research Co. LLC | 2.9 million | 5.12% | $341.0M |
| United Capital Financial Advisors LLC | 2.8 million | 4.92% | $328.0M |
| Estate Of Roy T Eddleman | 2.7 million | 4.80% | $320.0M |
| Vanguard Capital Management LLC | 2.4 million | 4.25% | $284.0M |
| Vanguard Portfolio Management LLC | 2.3 million | 4.09% | $273.0M |
| State Street Corporation | 1.8 million | 3.15% | $210.0M |
| BNY Mellon Investment Adviser, Inc. | 1.5 million | 2.71% | $181.0M |
| Maverick Capital Ltd. | 1.5 million | 2.69% | $180.0M |
As of May 18, 2026.
Repligen institutional holdings by quarter
| Quarter | Reports | Shares | Value |
|---|---|---|---|
| Q2 2026 | 501 | – | $9.1B |
| Q1 2026 | 458 | 65.5 million | $7.8B |
| Q4 2025 | 495 | 62.5 million | $10.2B |
| Q3 2025 | 485 | 60.8 million | $8.1B |
| Q2 2025 | 470 | 59.0 million | $7.2B |
| Q1 2025 | 462 | 58.1 million | $7.4B |
| Q4 2024 | 454 | 56.6 million | $8.1B |
| Q3 2024 | 470 | 55.9 million | $8.3B |
Shares and value held by institutions that file quarterly holdings reports (options not included).
Repligen insider trades
| Insider | Date | Title | Transaction | Value |
|---|---|---|---|---|
| Mhatre Rohin | May 14, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Konstantinov Konstantin B | May 14, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Pax Margaret | May 14, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Madaus Martin D Ph.D. | May 14, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Eglinton Manner Carrie | May 14, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Muir Glenn P | May 14, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Dawes Karen A | May 14, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Barthelemy Nicolas M | May 14, 2026 | Director | Stock Award(Grant) at price 0.00 per share. | – |
| Muir Glenn P | May 7, 2026 | Director | Conversion of Exercise of derivative security at price 38.76 per share. | $94,342 |
| Loeillot Olivier | Apr 21, 2026 | Chief Executive Officer | Sale at price 140.00 per share. | $536,480 |
| Garland Jason K. | Mar 5, 2026 | Chief Financial Officer | Stock Award(Grant) at price 0.00 per share. | – |
| Bylund James | Mar 5, 2026 | Chief Operating Officer | Stock Award(Grant) at price 0.00 per share. | – |
Newest 12 of 50 insider transactions in the last two years.
Questions and answers
Who owns the most Repligen stock?
BlackRock Advisors LLC, with 10.05% of the company (as of May 18, 2026). Next: T. Rowe Price International Ltd. (8.65%) and Fidelity Management & Research Co. LLC (5.12%).
How many institutions own Repligen stock?
501 institutional holdings reports listed Repligen shares in Q2 2026 worth $9.07 billion.
Are Repligen insiders buying or selling the stock?
In the last two years insiders reported 10 sales and 2 purchases (50 transactions in all); the newest on file is from May 14, 2026.
