Repligen's three largest insider shareholders as of September 29, 2026 are Karen A Dawes (Director, 92.82K shares), Anthony Hunt (Chief Executive Officer, 89.06K shares), Olivier Loeillot (Chief Executive Officer, 48.37K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Karen A Dawes | Director | 92,816 | 0 | 92,816 | 21.0% | 18 May, 2026 |
| 2 | Anthony Hunt | Chief Executive Officer | 89,062 | 0 | 89,062 | 20.2% | 03 Mar, 2026 |
| 3 | Olivier Loeillot | Chief Executive Officer | 48,369 | 0 | 48,369 | 10.9% | 25 Sep, 2026 |
| 4 | Glenn P Muir | Director | 40,051 | 0 | 40,051 | 9.1% | 18 May, 2026 |
| 5 | Jon Snodgres | Chief Financial Officer | 37,381 | 0 | 37,381 | 8.5% | 16 May, 2023 |
| 6 | Christine Gebski | Officer | 27,419 | 0 | 27,419 | 6.2% | 15 May, 2024 |
| 7 | James Bylund | Chief Operating Officer | 25,423 | 0 | 25,423 | 5.8% | 23 Mar, 2026 |
| 8 | Ralf Kuriyel | Senior Vp, Rd | 20,062 | 0 | 20,062 | 4.5% | 23 Mar, 2026 |
| 9 | Jason K Garland | Cfo | 18,408 | 0 | 18,408 | 4.2% | 28 Sep, 2026 |
| 10 | Brian Robb Douglass | Chief Product Officer | 7,985 | 0 | 7,985 | 1.8% | 08 May, 2026 |
| 11 | Martin D Madaus | Director | 6,581 | 0 | 6,581 | 1.5% | 18 May, 2026 |
| 12 | Manner Carrie Eglinton | Director | 5,461 | 0 | 5,461 | 1.2% | 18 May, 2026 |
| 13 | Nicolas Barthelemy | Director | 5,436 | 0 | 5,436 | 1.2% | 18 May, 2026 |
| 14 | Rohin Mhatre | Director | 5,014 | 0 | 5,014 | 1.1% | 18 May, 2026 |
| 15 | Violetta Hughes | Chief Accounting Officer | 4,142 | 0 | 4,142 | 0.9% | 04 Sep, 2025 |
| 16 | Konstantin Konstantinov | Director | 3,889 | 0 | 3,889 | 0.9% | 18 May, 2026 |
| 17 | Margaret Pax | Director | 3,011 | 0 | 3,011 | 0.7% | 18 May, 2026 |
| 18 | Thomas F Jr Ryan | Director | 1,457 | 0 | 1,457 | 0.3% | 02 Mar, 2022 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 25 Sep, 2026 | Jason K Garland | Cfo | Disposed F | 421 | $189.68 | $79.86K | 18,408 | Direct |
| 24 Sep, 2026 | Olivier Loeillot | Chief Executive Officer | Acquired M | 8,404 | $154.96 | $1.30Mn | 56,773 | Direct |
| 24 Sep, 2026 | Olivier Loeillot | Chief Executive Officer | Disposed S | 8,404 | $190.00 | $1.60Mn | 48,369 | Direct |
| 24 Sep, 2026 | Olivier Loeillot | Chief Executive Officer | Acquired M | 4,542 | $155.38 | $705.74K | 52,911 | Direct |
| 24 Sep, 2026 | Olivier Loeillot | Chief Executive Officer | Disposed S | 4,542 | $190.00 | $862.98K | 48,369 | Direct |
| 24 Sep, 2026 | Olivier Loeillot | Chief Executive Officer | Disposed M | 8,404 | $0.00 | $0 | 12,607 | Direct |
| 24 Sep, 2026 | Olivier Loeillot | Chief Executive Officer | Disposed M | 4,542 | $0.00 | $0 | 9,085 | Direct |
| 21 Sep, 2026 | Olivier Loeillot | Chief Executive Officer | Acquired M | 5,426 | $141.79 | $769.35K | 53,795 | Direct |
| 21 Sep, 2026 | Olivier Loeillot | Chief Executive Officer | Disposed S | 5,426 | $180.00 | $976.68K | 48,369 | Direct |
| 21 Sep, 2026 | Olivier Loeillot | Chief Executive Officer | Disposed M | 5,426 | $0.00 | $0 | 5,426 | Direct |
| 03 Sep, 2026 | Olivier Loeillot | Chief Executive Officer | Disposed F | 2,842 | $169.61 | $482.03K | 51,404 | Direct |
| 04 Sep, 2026 | Olivier Loeillot | Chief Executive Officer | Disposed S | 3,035 | $165.90 | $503.51K | 48,369 | Direct |
| 20 Aug, 2026 | Olivier Loeillot | Chief Executive Officer | Acquired M | 5,426 | $141.79 | $769.35K | 59,672 | Direct |
| 20 Aug, 2026 | Olivier Loeillot | Chief Executive Officer | Disposed S | 5,426 | $180.00 | $976.68K | 54,246 | Direct |
| 20 Aug, 2026 | Olivier Loeillot | Chief Executive Officer | Disposed M | 5,426 | $0.00 | $0 | 10,852 | Direct |
| 16 Jul, 2026 | Jason K Garland | Cfo | Disposed S | 530 | $150.00 | $79.50K | 18,829 | Direct |
| 25 Jun, 2026 | Jason K Garland | Cfo | Disposed S | 733 | $145.00 | $106.29K | 19,359 | Direct |
| 14 May, 2026 | Nicolas Barthelemy | Director | Acquired A | 995 | $0.00 | $0 | 5,436 | Direct |
| 14 May, 2026 | Rohin Mhatre | Director | Acquired A | 995 | $0.00 | $0 | 5,014 | Direct |
| 14 May, 2026 | Margaret Pax | Director | Acquired A | 995 | $0.00 | $0 | 3,011 | Direct |