Repligen RGEN Insider Ownership

Updated Oct 10, 2026

Across the past 12 months, open-market trades by Repligen insiders were all sales, totaling $15.26 million (91.97K shares).

• Behind Repligen's open-market sales in the past 12 months were 5 insiders, and no insider bought.
• Olivier Loeillot (Chief Executive Officer) was the top open-market seller of Repligen over the past 12 months, with $7.69 million sold (43.24K shares) and the latest sale on October 5, 2026.
• Away from the open market, RGEN insiders received 41.28K shares in stock awards, acquired 61.75K shares through option exercises and conversions and gave up 23.34K shares to cover taxes or exercise prices over the last 12 months.
• According to Business Quant data, insiders at Repligen reported 375.64K shares in total in their latest Form 4 filings, or 0.67% of the 56.43Mn shares outstanding; that total is down 2.27% from 384.35K shares at the end of Q2 2026 and down 1.21% from 380.23K shares at the end of Q3 2025.
• Indirect holdings, through trusts, partnerships, family members and other entities, make up 0.48% (1.81K shares) of Repligen's insider total, with the other 99.52% (373.83K shares) held directly.
• Per Business Quant, 15 insiders of RGEN hold shares, counting officers, directors and 10% owners who have filed a Form 4 in the past two years.
• Repligen's three largest insider shareholders, based on their latest Form 4 filings, are Karen A. Dawes (Director, 92.82K shares), Anthony Hunt (Director, 89.06K shares) and Olivier Loeillot (Chief Executive Officer, 45.79K shares).
• Karen A. Dawes alone accounts for 24.71% of the shares held by Repligen insiders.
• In the last 12 months, 41 Form 4 filings with transactions in RGEN stock came from 14 insiders.
• Insider figures for RGEN include Form 4 filings through October 8, 2026.