15 insiders reported 84 Form 4 transactions for REPLIGEN CORP (RGEN) over the past 18 months (most recent 2026-09-22). Recent activity: Loeillot Olivier (Chief Executive Officer) Buy 5,426 shares, Loeillot Olivier (Chief Executive Officer) Sell 5,426 shares, Loeillot Olivier (Chief Executive Officer) Sell 2,842 shares, Loeillot Olivier (Chief Executive Officer) Sell 3,035 shares, Hughes Violetta (CHIEF ACCOUNTING OFFICER) Buy 2,466 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-22 | Loeillot Olivier | Chief Executive Officer | Buy | 5,426 | $769,353 |
| 2026-09-22 | Loeillot Olivier | Chief Executive Officer | Sell | 5,426 | $976,680 |
| 2026-09-08 | Loeillot Olivier | Chief Executive Officer | Sell | 2,842 | $482,032 |
| 2026-09-08 | Loeillot Olivier | Chief Executive Officer | Sell | 3,035 | $503,506 |
| 2026-09-02 | Hughes Violetta | CHIEF ACCOUNTING OFFICER | Buy | 2,466 | $0 |
| 2026-09-02 | Hughes Violetta | CHIEF ACCOUNTING OFFICER | Sell | 277 | $47,096 |
| 2026-08-21 | Loeillot Olivier | Chief Executive Officer | Buy | 5,426 | $769,353 |
| 2026-08-21 | Loeillot Olivier | Chief Executive Officer | Sell | 5,426 | $976,680 |
| 2026-07-17 | Garland Jason K | CFO | Sell | 530 | $79,500 |
| 2026-06-26 | Garland Jason K | CFO | Sell | 733 | $106,285 |
| 2026-05-18 | Konstantinov Konstantin | Director | Buy | 995 | $0 |
| 2026-05-18 | Mhatre Rohin | Director | Buy | 995 | $0 |
| 2026-05-18 | Pax Margaret | Director | Buy | 995 | $0 |
| 2026-05-18 | DAWES KAREN A | Director | Buy | 995 | $0 |
| 2026-05-18 | BARTHELEMY NICOLAS | Director | Buy | 995 | $0 |
| 2026-05-18 | MUIR GLENN P | Director | Buy | 995 | $0 |
| 2026-05-18 | EGLINTON MANNER CARRIE | Director | Buy | 995 | $0 |
| 2026-05-18 | Madaus Martin D | Director | Buy | 995 | $0 |
| 2026-05-08 | MUIR GLENN P | Director | Buy | 2,434 | $94,342 |
| 2026-05-08 | Douglass Brian Robb | CHIEF PRODUCT OFFICER | Sell | 334 | $42,228 |
| 2026-04-22 | Loeillot Olivier | Chief Executive Officer | Sell | 3,832 | $536,480 |
| 2026-03-23 | Garland Jason K | CFO | Buy | 7,751 | $0 |
| 2026-03-23 | Bylund James | Chief Operating Officer | Buy | 7,751 | $0 |
| 2026-03-23 | Loeillot Olivier | Chief Executive Officer | Buy | 24,134 | $0 |
| 2026-03-23 | KURIYEL RALF | Senior VP, R&D | Buy | 5,284 | $0 |
Source: SEC Form 4 filings · as of 2026-09-22