Repligen Corporation
Ownership
Ownership Structure
Who owns Repligen Corporation (RGEN)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 94.8% of the shares are freely tradable; institutional investors hold 119.7%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 10.62 | 5,993,054 | -9.5 | 03/31/2026 |
| T. Rowe Price Associates, Inc. | 8.64 | 4,878,141 | +6.1 | 03/31/2026 |
| FMR Inc | 5.12 | 2,886,786 | +0.7 | 03/31/2026 |
| United Capital Financial Advisers Inc | 4.92 | 2,773,980 | +0.1 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.25 | 2,396,511 | +0.0 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 4.08 | 2,305,094 | +0.0 | 03/31/2026 |
| State Street Corp | 3.15 | 1,777,285 | +3.4 | 03/31/2026 |
| Wasatch Advisors LP | 2.82 | 1,590,251 | +27.9 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Mid-Cap ETF | 3.29 | 1,857,005 | +0.0 | 08/31/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.03 | 1,708,473 | +0.3 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Loeillot Olivier | Chief Executive Officer | 48,369 | 8,556,476 $ | Sep 4, 2026 | direct |
| Garland Jason K | CFO | 18,829 | 3,330,850 $ | Jul 16, 2026 | direct |
| Hughes Violetta | CHIEF ACCOUNTING OFFICER | 6,331 | 1,119,954 $ | Sep 1, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 4, 2026 | Loeillot Olivier | Chief Executive Officer | Sell | 3,035 | 165.90 | 503,507 |
| Sep 3, 2026 | Loeillot Olivier | Chief Executive Officer | Other | 2,842 | 169.61 | 482,032 |
| Sep 1, 2026 | Hughes Violetta | CHIEF ACCOUNTING OFFICER | Other | 277 | 170.02 | 47,096 |
| Aug 20, 2026 | Loeillot Olivier | Chief Executive Officer | Sell | 5,426 | 180.00 | 976,680 |
| Aug 20, 2026 | Loeillot Olivier | Chief Executive Officer | Other | 5,426 | 141.79 | 769,353 |
| Jul 16, 2026 | Garland Jason K | CFO | Sell | 530 | 150.00 | 79,500 |
| Mar 5, 2026 | Hughes Violetta | CHIEF ACCOUNTING OFFICER | Other | 2,466 | 0.00 | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 18, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.