Repligen Corp (RGEN) Insider Ownership

Historic Insider Ownership Trends

As of May 23, 2026, Repligen's top three insider holders are Karen A Dawes (Director, 91.82K shares), Anthony Hunt (Chief Executive Officer, 89.06K shares), Olivier Loeillot (Chief Executive Officer, 54.25K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Glenn P Muir - 36,622 0 17 Dec, 2025
Karen A Dawes - 91,821 0 18 Dec, 2025
Thomas F Jr Ryan - 1,457 0 02 Mar, 2022
Nicolas Barthelemy - 4,441 0 21 May, 2025
Martin D Madaus - 5,586 0 19 May, 2025
Anthony Hunt Chief Executive Officer 89,062 0 03 Mar, 2026
Jon Snodgres Chief Financial Officer 37,381 0 16 May, 2023
Manner Carrie Eglinton - 4,466 0 19 May, 2025
Ralf Kuriyel Senior Vp, Rd 20,062 0 23 Mar, 2026
Jason K Garland Cfo 20,092 0 23 Mar, 2026
Konstantin Konstantinov - 2,894 0 19 May, 2025
Rohin Mhatre - 4,019 0 19 May, 2025
Christine Gebski - 27,419 0 15 May, 2024
James Bylund Chief Operating Officer 25,423 0 23 Mar, 2026
Violetta Hughes Chief Accounting Officer 4,142 0 04 Sep, 2025
Olivier Loeillot Chief Executive Officer 54,246 0 22 Apr, 2026
Margaret Pax - 2,016 0 19 May, 2025
Brian Robb Douglass Chief Product Officer 8,319 0 03 Mar, 2026

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
21 Apr, 2026 Olivier Loeillot Common Stock D 3,832 $140.00 54,246 D S
05 Mar, 2026 Olivier Loeillot Common Stock A 24,134 $0.00 58,078 D A
05 Mar, 2026 James Bylund Common Stock A 7,751 $0.00 25,423 D A
05 Mar, 2026 Ralf Kuriyel Common Stock A 5,284 $0.00 20,062 D A
05 Mar, 2026 Jason K Garland Common Stock A 7,751 $0.00 20,092 D A
05 Mar, 2026 Ralf Kuriyel Stock Option (Right to Buy) A 5,669 $0.00 5,669 D A
05 Mar, 2026 James Bylund Stock Option (Right to Buy) A 8,315 $0.00 8,315 D A
05 Mar, 2026 Jason K Garland Stock Option (Right to Buy) A 8,315 $0.00 8,315 D A
05 Mar, 2026 Olivier Loeillot Stock Option (Right to Buy) A 25,890 $0.00 25,890 D A
04 Mar, 2026 James Bylund Common Stock A 125 $0.00 17,734 D A
04 Mar, 2026 Ralf Kuriyel Common Stock A 125 $0.00 14,820 D A
04 Mar, 2026 Ralf Kuriyel Common Stock D 42 $125.84 14,778 D F
04 Mar, 2026 James Bylund Common Stock D 62 $125.84 17,672 D F
27 Feb, 2026 James Bylund Common Stock D 1,478 $128.73 20,042 D F
27 Feb, 2026 Jason K Garland Common Stock D 327 $128.73 13,056 D F
27 Feb, 2026 Olivier Loeillot Common Stock D 344 $128.73 35,554 D F
02 Mar, 2026 Anthony Hunt Common Stock D 9,897 $124.97 89,062 D F
02 Mar, 2026 Brian Robb Douglass Common Stock D 221 $124.97 8,319 D F
27 Feb, 2026 Ralf Kuriyel Common Stock D 444 $128.73 15,618 D F
02 Mar, 2026 James Bylund Common Stock D 2,433 $124.97 17,609 D F