RGEN
Repligen Corporation
NASDAQ: RGEN · HEALTHCARE · MEDICAL INSTRUMENTS & SUPPLIES
$165.18
+0.30% today
Updated 2026-09-11
Market cap
$9.51B
P/E ratio
227.74
P/S ratio
12.11x
EPS (TTM)
$0.74
Dividend yield
—
52W range
$101 – $189
Volume
1.1M
Repligen Corporation (RGEN) Insider transactions
Net insider activity
Net buying (12,509 shares)
Buy transactions
50
Sell transactions
50
All transactions
| Date | Insider | Title | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-09-04 | LOEILLOT, OLIVIER | Director, Chief Executive Officer | Sale | 3,035 | $165.90 | $503506.50 |
| 2026-09-03 | LOEILLOT, OLIVIER | Director, Chief Executive Officer | Sale | 2,842 | $169.61 | $482031.62 |
| 2026-09-01 | HUGHES, VIOLETTA | CHIEF ACCOUNTING OFFICER | Sale | 277 | $170.02 | $47095.54 |
| 2026-08-20 | LOEILLOT, OLIVIER | Director, Chief Executive Officer | Sale | 5,426 | — | — |
| 2026-08-20 | LOEILLOT, OLIVIER | Director, Chief Executive Officer | Sale | 5,426 | $180.00 | $976680.00 |
| 2026-07-16 | GARLAND, JASON K | CFO | Sale | 530 | $150.00 | $79500.00 |
| 2026-06-25 | GARLAND, JASON K | CFO | Sale | 733 | $145.00 | $106285.00 |
| 2026-05-14 | PAX, MARGARET | Director | Buy | 2,239 | — | — |
| 2026-05-14 | PAX, MARGARET | Director | Buy | 995 | — | — |
| 2026-05-14 | MUIR, GLENN P | Director | Buy | 2,239 | — | — |
| 2026-05-14 | MUIR, GLENN P | Director | Buy | 995 | — | — |
| 2026-05-14 | MHATRE, ROHIN | Director | Buy | 2,239 | — | — |
| 2026-05-14 | MHATRE, ROHIN | Director | Buy | 995 | — | — |
| 2026-05-14 | MADAUS, MARTIN D | Director | Buy | 2,239 | — | — |
| 2026-05-14 | MADAUS, MARTIN D | Director | Buy | 995 | — | — |
| 2026-05-14 | KONSTANTINOV, KONSTANTIN | Director | Buy | 2,239 | — | — |
| 2026-05-14 | KONSTANTINOV, KONSTANTIN | Director | Buy | 995 | — | — |
| 2026-05-14 | EGLINTON, MANNER CARRIE | Director | Buy | 2,239 | — | — |
| 2026-05-14 | EGLINTON, MANNER CARRIE | Director | Buy | 995 | — | — |
| 2026-05-14 | DAWES, KAREN A | Director | Buy | 2,239 | — | — |
| 2026-05-14 | DAWES, KAREN A | Director | Buy | 995 | — | — |
| 2026-05-14 | BARTHELEMY, NICOLAS | Director | Buy | 2,239 | — | — |
| 2026-05-14 | BARTHELEMY, NICOLAS | Director | Buy | 995 | — | — |
| 2026-05-07 | MUIR, GLENN P | Director | Buy | 2,434 | — | — |
| 2026-05-07 | MUIR, GLENN P | Director | Buy | 2,434 | $38.76 | $94341.84 |
| 2026-05-07 | DOUGLASS, BRIAN ROBB | CHIEF PRODUCT OFFICER | Sale | 334 | $126.43 | $42227.62 |
| 2026-04-21 | LOEILLOT, OLIVIER | Director, Chief Executive Officer | Sale | 3,832 | $140.00 | $536480.00 |
| 2026-03-05 | LOEILLOT, OLIVIER | Chief Executive Officer | Buy | 25,890 | — | — |
| 2026-03-05 | LOEILLOT, OLIVIER | Chief Executive Officer | Buy | 24,134 | — | — |
| 2026-03-05 | KURIYEL, RALF | Senior VP, R&D | Buy | 5,669 | — | — |
| 2026-03-05 | KURIYEL, RALF | Senior VP, R&D | Buy | 5,284 | — | — |
| 2026-03-05 | HUGHES, VIOLETTA | CHIEF ACCOUNTING OFFICER | Buy | 2,466 | — | — |
| 2026-03-05 | GARLAND, JASON K | CFO | Buy | 8,315 | — | — |
| 2026-03-05 | GARLAND, JASON K | CFO | Buy | 7,751 | — | — |
| 2026-03-05 | BYLUND, JAMES | Chief Operating Officer | Buy | 8,315 | — | — |
| 2026-03-05 | BYLUND, JAMES | Chief Operating Officer | Buy | 7,751 | — | — |
| 2026-03-04 | KURIYEL, RALF | Senior VP, R&D | Buy | 125 | — | — |
| 2026-03-04 | KURIYEL, RALF | Senior VP, R&D | Sale | 42 | $125.84 | $5285.28 |
| 2026-03-04 | BYLUND, JAMES | Chief Operating Officer | Buy | 125 | — | — |
| 2026-03-04 | BYLUND, JAMES | Chief Operating Officer | Sale | 62 | $125.84 | $7802.08 |
| 2026-03-02 | LOEILLOT, OLIVIER | Director, Chief Executive Officer | Sale | 1,610 | $124.97 | $201201.70 |
| 2026-03-02 | KURIYEL, RALF | Senior VP, R&D | Sale | 923 | $124.97 | $115347.31 |
| 2026-03-02 | HUNT, ANTHONY | Director | Sale | 9,897 | $124.97 | $1.24M |
| 2026-03-02 | GARLAND, JASON K | CFO | Sale | 715 | $124.97 | $89353.55 |
| 2026-03-02 | DOUGLASS, BRIAN ROBB | CHIEF PRODUCT OFFICER | Sale | 221 | $124.97 | $27618.37 |
| 2026-03-02 | BYLUND, JAMES | Chief Operating Officer | Sale | 2,433 | $124.97 | $304052.01 |
| 2026-02-27 | LOEILLOT, OLIVIER | Director, Chief Executive Officer | Sale | 344 | $128.73 | $44283.12 |
| 2026-02-27 | KURIYEL, RALF | Senior VP, R&D | Sale | 444 | $128.73 | $57156.12 |
| 2026-02-27 | GARLAND, JASON K | CFO | Sale | 327 | $128.73 | $42094.71 |
| 2026-02-27 | BYLUND, JAMES | Chief Operating Officer | Sale | 1,478 | $128.73 | $190262.94 |
| 2025-12-31 | DOUGLASS, BRIAN ROBB | CHIEF PRODUCT OFFICER | Buy | 2,143 | — | — |
| 2025-12-31 | DOUGLASS, BRIAN ROBB | CHIEF PRODUCT OFFICER | Buy | 2,288 | — | — |
| 2025-12-17 | DAWES, KAREN A | Director | Sale | 275 | $161.00 | $44275.00 |
| 2025-12-16 | MUIR, GLENN P | Director | Buy | 3,366 | — | — |
| 2025-12-16 | MUIR, GLENN P | Director | Buy | 3,366 | $26.12 | $87919.92 |
| 2025-12-04 | HUNT, ANTHONY | Director | Sale | 2,000 | — | — |
| 2025-11-25 | LOEILLOT, OLIVIER | Director, Chief Executive Officer | Sale | 7,041 | $170.00 | $1.20M |
| 2025-11-18 | BYLUND, JAMES | Chief Operating Officer | Sale | 2,191 | $151.21 | $331301.11 |
| 2025-11-13 | HUNT, ANTHONY | Director | Buy | 2,952 | — | — |
| 2025-11-13 | HUNT, ANTHONY | Director | Sale | 5,737 | $156.22 | $896234.14 |
| 2025-11-13 | HUNT, ANTHONY | Director | Sale | 3,000 | $155.45 | $466350.00 |
| 2025-11-13 | HUNT, ANTHONY | Director | Buy | 2,952 | $33.87 | $99984.24 |
| 2025-11-13 | HUNT, ANTHONY | Director | Sale | 2,923 | $153.14 | $447628.22 |
| 2025-11-13 | HUNT, ANTHONY | Director | Sale | 2,500 | $154.32 | $385800.00 |
| 2025-11-13 | HUNT, ANTHONY | Director | Sale | 2,100 | $152.17 | $319557.00 |
| 2025-11-13 | HUNT, ANTHONY | Director | Sale | 1,956 | $157.11 | $307307.16 |
| 2025-11-13 | HUNT, ANTHONY | Director | Sale | 1,784 | $151.01 | $269401.84 |
| 2025-11-12 | HUNT, ANTHONY | Director | Sale | 25,000 | — | — |
| 2025-11-12 | HUNT, ANTHONY | Director | Buy | 25,000 | $33.87 | $846750.00 |
| 2025-11-12 | HUNT, ANTHONY | Director | Sale | 11,096 | $158.01 | $1.75M |
| 2025-11-12 | HUNT, ANTHONY | Director | Sale | 4,959 | $156.65 | $776827.35 |
| 2025-11-12 | HUNT, ANTHONY | Director | Sale | 4,740 | $155.85 | $738729.00 |
| 2025-11-12 | HUNT, ANTHONY | Director | Sale | 3,741 | $154.92 | $579555.72 |
| 2025-11-12 | HUNT, ANTHONY | Director | Sale | 464 | $158.51 | $73548.64 |
| 2025-10-02 | LOEILLOT, OLIVIER | Director, Chief Executive Officer | Sale | 1,248 | $145.23 | $181247.04 |
| 2025-09-25 | GARLAND, JASON K | CFO | Sale | 412 | $121.68 | $50132.16 |
| 2025-09-10 | HUNT, ANTHONY | Director | Sale | 20,000 | — | — |
| 2025-09-10 | HUNT, ANTHONY | Director | Buy | 20,000 | $33.87 | $677400.00 |
| 2025-09-10 | HUNT, ANTHONY | Director | Sale | 14,882 | $120.19 | $1.79M |
| 2025-09-10 | HUNT, ANTHONY | Director | Sale | 7,584 | $121.42 | $920849.28 |
| 2025-09-10 | HUNT, ANTHONY | Director | Sale | 3,262 | $119.64 | $390265.68 |
| 2025-09-10 | HUNT, ANTHONY | Director | Sale | 2,179 | $122.23 | $266339.17 |
| 2025-09-10 | HUNT, ANTHONY | Director | Sale | 1,108 | $118.32 | $131098.56 |
| 2025-09-10 | HUNT, ANTHONY | Director | Sale | 96 | $116.34 | $11168.64 |
| 2025-09-03 | LOEILLOT, OLIVIER | Director, Chief Executive Officer | Sale | 2,506 | $116.18 | $291147.08 |
| 2025-09-02 | HUGHES, VIOLETTA | CHIEF ACCOUNTING OFFICER | Buy | 3,914 | — | — |
| 2025-09-02 | HUGHES, VIOLETTA | CHIEF ACCOUNTING OFFICER | Buy | 4,142 | — | — |
| 2025-08-08 | MADAUS, MARTIN D | Director | Buy | 1,800 | $112.13 | $201830.40 |
| 2025-05-15 | PAX, MARGARET | Director | Buy | 1,800 | — | — |
| 2025-05-15 | PAX, MARGARET | Director | Buy | 973 | — | — |
| 2025-05-15 | MUIR, GLENN P | Director | Buy | 1,800 | — | — |
| 2025-05-15 | MUIR, GLENN P | Director | Buy | 973 | — | — |
| 2025-05-15 | MHATRE, ROHIN | Director | Buy | 1,800 | — | — |
| 2025-05-15 | MHATRE, ROHIN | Director | Buy | 973 | — | — |
| 2025-05-15 | MADAUS, MARTIN D | Director | Buy | 1,800 | — | — |
| 2025-05-15 | MADAUS, MARTIN D | Director | Buy | 973 | — | — |
| 2025-05-15 | KONSTANTINOV, KONSTANTIN | Director | Buy | 1,800 | — | — |
| 2025-05-15 | KONSTANTINOV, KONSTANTIN | Director | Buy | 973 | — | — |
| 2025-05-15 | HUNT, ANTHONY | Director | Sale | 17,596 | $123.57 | $2.17M |
| 2025-05-15 | HUNT, ANTHONY | Director | Sale | 6,533 | $124.34 | $812313.22 |
Frequently asked questions
Are RGEN insiders buying or selling?
Over the transactions on record, RGEN insiders have been net sellers, with about $20.70M in stock sold across 50 sales, against 6 open-market purchases.
Does insider selling at RGEN mean the stock will fall?
Not by itself. Most executive selling is pre-scheduled through 10b5-1 plans filed months in advance, and insiders sell for diversification, taxes, and liquidity far more often than out of any view on the price. Insider buying is the stronger signal, especially when several insiders buy around the same time, because there is usually only one reason to put personal cash into the stock.
Which RGEN insiders are selling the most?
Recent selling is concentrated in a few names. HUNT, ANTHONY accounts for the largest share on record, with about $14.75M sold. Selling by one or two individuals matters less than broad selling across the whole leadership team, which is the pattern worth watching.