Repligen Corporation (RGEN) has 20 known insider and institutional holders on record. The largest holder is EDDLEMAN ROY T with 370,000 shares. Other notable holders include HERLIHY WALTER C and DAWES KAREN A.
Over the last 12 months, insiders have made 41 transactions in RGEN stock — 17 buys (valued at $9.83M) and 6 sells (valued at $1.91M). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
RGEN Insider Ownership
Top Holder
EDDLEMAN ROY T
370,000 shares
Buys (12 mo)
17
$9.83M value
Sells (12 mo)
6
$1.91M value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Eddleman Roy T |
10 Percent Owner |
370,000 |
2018-08-13 |
|
| 2 |
Herlihy Walter C |
President, CEO |
262,430 |
2015-05-14 |
|
| 3 |
Dawes Karen A |
Director |
91,821 |
2025-12-18 |
|
| 4 |
Hunt Anthony |
Director |
89,062 |
2026-03-03 |
|
| 5 |
Snodgres Jon |
Chief Financial Officer |
37,381 |
2023-05-16 |
|
| 6 |
Cooper Glenn L Md |
Director |
35,709 |
2019-05-28 |
|
| 7 |
Gebski Christine |
See Remarks |
27,419 |
2024-05-15 |
|
| 8 |
Loeillot Olivier |
Chief Executive Officer |
25,890 |
2026-03-23 |
|
| 9 |
Ryan Thomas F Jr |
Director |
12,337 |
2021-11-04 |
|
| 10 |
Rusche James R |
Senior Vice President |
9,895 |
2016-03-01 |
|
| 11 |
Douglass Brian Robb |
Chief Product Officer |
8,319 |
2026-03-03 |
|
| 12 |
Garland Jason K |
CFO |
8,315 |
2026-03-23 |
|
| 13 |
Bylund James |
Chief Operating Officer |
8,315 |
2026-03-23 |
|
| 14 |
Benjamin Howard |
VP Business Development |
8,289 |
2017-05-22 |
|
| 15 |
Kuriyel Ralf |
Senior VP, R&d |
5,669 |
2026-03-23 |
|
| 16 |
Hughes Violetta |
Chief Accounting Officer |
3,914 |
2025-09-04 |
|
| 17 |
Muir Glenn P |
Director |
3,366 |
2025-12-17 |
|
| 18 |
Goldberg Alfred Lewis |
Director |
1,992 |
2015-05-26 |
|
| 19 |
Mhatre Rohin |
Director |
1,800 |
2025-05-19 |
|
| 20 |
Barthelemy Nicolas |
Director |
1,800 |
2025-05-21 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-03-05 |
Loeillot Olivier |
Chief Executive Officer |
RSU Award |
25,890 |
$141.91 |
$3.67M |
| 2026-03-05 |
Bylund James |
Chief Operating Officer |
RSU Award |
8,315 |
$141.91 |
$1.18M |
| 2026-03-05 |
Garland Jason K |
CFO |
RSU Award |
8,315 |
$141.91 |
$1.18M |
| 2026-03-05 |
Kuriyel Ralf |
Senior VP, R&d |
RSU Award |
5,669 |
$141.91 |
$804.49K |
| 2026-03-04 |
Bylund James |
Chief Operating Officer |
Tax Withholding of RSU |
62 |
$125.84 |
$7.8K |
| 2026-03-04 |
Kuriyel Ralf |
Senior VP, R&d |
Tax Withholding of RSU |
42 |
$125.84 |
$5.29K |
| 2026-03-02 |
Douglass Brian Robb |
Chief Product Officer |
Tax Withholding of RSU |
221 |
$124.97 |
$27.62K |
| 2026-03-02 |
Loeillot Olivier |
Chief Executive Officer |
Tax Withholding of RSU |
1,610 |
$124.97 |
$201.2K |
| 2026-02-27 |
Loeillot Olivier |
Chief Executive Officer |
Tax Withholding of RSU |
344 |
$128.73 |
$44.28K |
| 2026-03-02 |
Bylund James |
Chief Operating Officer |
Tax Withholding of RSU |
2,433 |
$124.97 |
$304.05K |
| 2026-02-27 |
Bylund James |
Chief Operating Officer |
Tax Withholding of RSU |
1,478 |
$128.73 |
$190.26K |
| 2026-03-02 |
Garland Jason K |
CFO |
Tax Withholding of RSU |
715 |
$124.97 |
$89.35K |
| 2026-02-27 |
Garland Jason K |
CFO |
Tax Withholding of RSU |
327 |
$128.73 |
$42.09K |
| 2026-03-02 |
Kuriyel Ralf |
Senior VP, R&d |
Tax Withholding of RSU |
923 |
$124.97 |
$115.35K |
| 2026-02-27 |
Kuriyel Ralf |
Senior VP, R&d |
Tax Withholding of RSU |
444 |
$128.73 |
$57.16K |
| 2026-03-02 |
Hunt Anthony |
Director |
Tax Withholding of RSU |
9,897 |
$124.97 |
$1.24M |
| 2025-12-31 |
Douglass Brian Robb |
Chief Product Officer |
RSU Award |
2,143 |
$163.86 |
$351.15K |
| 2025-12-31 |
Douglass Brian Robb |
Chief Product Officer |
Unknown |
7,020 |
$167.72 |
$1.18M |
| 2025-12-17 |
Dawes Karen A |
Director |
Informative Sell |
275 |
$161.00 |
$44.28K |
| 2025-12-16 |
Muir Glenn P |
Director |
Option Exercise |
3,366 |
$26.12 |
$87.92K |
| 2025-12-04 |
Hunt Anthony |
Director |
Other (Sell) |
2,000 |
- |
- |
| 2025-11-25 |
Loeillot Olivier |
Chief Executive Officer |
Informative Sell |
7,041 |
$170.00 |
$1.2M |
| 2025-11-18 |
Bylund James |
Chief Operating Officer |
Informative Sell |
2,191 |
$151.21 |
$331.3K |
| 2025-11-13 |
Hunt Anthony |
Director |
Option Exercise |
2,952 |
$33.87 |
$99.98K |
| 2025-11-12 |
Hunt Anthony |
Director |
Informative Sell |
464 |
$158.51 |
$73.55K |
