Repligen Corp (RGEN) Insider Ownership

Historic Insider Ownership Trends

As of March 23, 2026, Repligen's top three insider holders are Karen A Dawes (Director, 91.82K shares), Anthony Hunt (Director, 89.06K shares), Jon Snodgres (Chief Financial Officer, 37.38K 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
Karen A Dawes 91,821 0 18 Dec, 2025
Anthony Hunt 89,062 0 03 Mar, 2026
Olivier Loeillot Chief Executive Officer 58,078 0 23 Mar, 2026
Jon Snodgres Chief Financial Officer 37,381 0 16 May, 2023
Glenn P Muir 36,622 0 17 Dec, 2025
Olivier Loeillot Chief Executive Officer 33,944 0 03 Mar, 2026
Christine Gebski See Remarks 27,419 0 15 May, 2024
James Bylund Chief Operating Officer 25,423 0 23 Mar, 2026
Jason K Garland Cfo 20,092 0 23 Mar, 2026
Ralf Kuriyel Senior Vp, Rd 20,062 0 23 Mar, 2026
James Bylund Chief Operating Officer 17,672 0 05 Mar, 2026
Ralf Kuriyel Senior Vp, Rd 14,778 0 05 Mar, 2026
Jason K Garland Cfo 12,341 0 03 Mar, 2026
Brian Robb Douglass Chief Product Officer 8,319 0 03 Mar, 2026
Martin D Madaus 5,586 0 19 May, 2025
Manner Carrie Eglinton 4,466 0 19 May, 2025
Manner Carrie Eglinton 4,466 0 19 May, 2025
Nicolas Barthelemy 4,441 0 21 May, 2025
Violetta Hughes Chief Accounting Officer 4,142 0 04 Sep, 2025
Rohin Mhatre 4,019 0 19 May, 2025
Konstantin Konstantinov 2,894 0 19 May, 2025
Margaret Pax 2,016 0 19 May, 2025
Martin D Madaus 0 1,800 12 Aug, 2025
Thomas F Jr Ryan 1,457 0 02 Mar, 2022

* 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
05 Mar, 2026 Jason K Garland Common Stock A 7,751 $0.00 20,092 D A
05 Mar, 2026 Olivier Loeillot Common Stock A 24,134 $0.00 58,078 D A
05 Mar, 2026 Ralf Kuriyel Common Stock A 5,284 $0.00 20,062 D A
05 Mar, 2026 James Bylund Common Stock A 7,751 $0.00 25,423 D A
05 Mar, 2026 Ralf Kuriyel Stock Option (Right to Buy) A 5,669 $0.00 5,669 D A
05 Mar, 2026 Olivier Loeillot Stock Option (Right to Buy) A 25,890 $0.00 25,890 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
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 A 125 $0.00 14,820 D A
04 Mar, 2026 James Bylund Common Stock A 125 $0.00 17,734 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
04 Mar, 2026 James Bylund Common Stock D 62 $125.84 17,672 D F
04 Mar, 2026 Ralf Kuriyel Common Stock D 42 $125.84 14,778 D F
27 Feb, 2026 James Bylund Common Stock D 1,478 $128.73 20,042 D F
27 Feb, 2026 Ralf Kuriyel Common Stock D 444 $128.73 15,618 D F
02 Mar, 2026 Brian Robb Douglass Common Stock D 221 $124.97 8,319 D F
27 Feb, 2026 Olivier Loeillot Common Stock D 344 $128.73 35,554 D F