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. 84.2% of the shares are freely tradable; institutional investors hold 119.7%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 9.56 | 5,384,938 | -10.1 | 06/30/2026 |
| FMR Inc | 5.91 | 3,326,690 | +15.2 | 06/30/2026 |
| United Capital Financial Advisers Inc | 4.95 | 2,790,650 | +0.6 | 06/30/2026 |
| Vanguard Capital Management, LLC | 4.28 | 2,411,171 | +0.6 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 4.11 | 2,312,825 | +0.3 | 06/30/2026 |
| Maverick Capital Ltd | 3.52 | 1,984,554 | +30.7 | 06/30/2026 |
| State Street Corp | 3.20 | 1,800,530 | +1.3 | 06/30/2026 |
| T. Rowe Price Associates, Inc. | 3.11 | 1,752,274 | -64.1 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Mid-Cap ETF | 3.57 | 2,010,262 | +0.0 | 09/30/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.03 | 1,706,650 | +0.3 | 09/30/2026 |
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 | 45,788 | 7,921,324 $ | Oct 5, 2026 | direct |
| Garland Jason K | CFO | 18,408 | 3,184,584 $ | Sep 25, 2026 | direct |
| Douglass Brian Robb | CHIEF PRODUCT OFFICER | 8,685 | 1,502,505 $ | Oct 6, 2026 | direct |
| Hughes Violetta | CHIEF ACCOUNTING OFFICER | 6,331 | 1,095,263 $ | 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 |
|---|---|---|---|---|---|---|
| Oct 6, 2026 | Douglass Brian Robb | CHIEF PRODUCT OFFICER | Other | 700 | 0.00 | – |
| Oct 5, 2026 | Loeillot Olivier | Chief Executive Officer | Sell | 4,202 | 190.00 | 798,380 |
| Oct 5, 2026 | Loeillot Olivier | Chief Executive Officer | Other | 4,202 | 154.96 | 651,142 |
| Oct 5, 2026 | Loeillot Olivier | Chief Executive Officer | Sell | 1,333 | 178.75 | 238,274 |
| Oct 2, 2026 | Loeillot Olivier | Chief Executive Officer | Other | 1,248 | 181.70 | 226,762 |
| Sep 25, 2026 | Garland Jason K | CFO | Other | 421 | 189.68 | 79,855 |
| Sep 24, 2026 | Loeillot Olivier | Chief Executive Officer | Sell | 4,542 | 190.00 | 862,980 |
| Sep 24, 2026 | Loeillot Olivier | Chief Executive Officer | Other | 4,542 | 155.38 | 705,736 |
| Sep 24, 2026 | Loeillot Olivier | Chief Executive Officer | Sell | 8,404 | 190.00 | 1,596,760 |
| Sep 24, 2026 | Loeillot Olivier | Chief Executive Officer | Other | 8,404 | 154.96 | 1,302,284 |
| Sep 21, 2026 | Loeillot Olivier | Chief Executive Officer | Sell | 5,426 | 180.00 | 976,680 |
| Sep 21, 2026 | Loeillot Olivier | Chief Executive Officer | Other | 5,426 | 141.79 | 769,353 |
| 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: November 2, 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.