James Bylund serves as Executive at REPLIGEN CORP, where they oversee executive responsibilities. Since joining the company, James Bylund has executed 24 insider transactions totaling $1.8M, demonstrating a bearish approach to their equity position. Their most recent transaction on Nov 18, 2025 involved selling 2,191 shares valued at $331.3K.
James Bylund currently holds 21,520 shares of REPLIGEN CORP (RGEN), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, James Bylund has been a net seller of RGEN stock. They have purchased $0 and sold $1.8M worth of shares.
James Bylund's most recent insider trade was on Nov 18, 2025, when they sold 2,191 shares at $151.21 per share.
Get notified when new Form 4 filings are submitted
| $182.95 |
| Discretionary |
| Mar 7, 2024 | RGEN | $236.0K | Payment | 1,206 | $195.72 | Discretionary |
| Mar 5, 2024 | RGEN | $4.3K | Payment | 22 | $195.52 | Discretionary |
| Mar 4, 2024 | RGEN | $38.2K | Payment | 197 | $193.99 | Discretionary |
| Mar 1, 2024 | RGEN | $157.3K | Payment | 820 | $191.79 | Discretionary |
| Mar 1, 2024 | RGEN | $0 | Award | 50 | $N/A | Discretionary |
| Feb 29, 2024 | RGEN | $0 | Award | 404 | $N/A | Discretionary |
| Feb 27, 2024 | RGEN | $0 | Award | 8,691 | $N/A | Discretionary |
| Feb 23, 2024 | RGEN | $88.7K | Option Exercise | 940 | $94.33 | Discretionary |
| Feb 23, 2024 | RGEN | $866.2K | Sale | 4,373 | $198.08 | Discretionary |
| Apr 4, 2023 | RGEN | $54.6K | Payment | 334 | $163.45 | Discretionary |
| Mar 3, 2023 | RGEN | $39.5K | Payment | 210 | $188.00 | Discretionary |
| Mar 3, 2023 | RGEN | $0 | Award | 625 | $N/A | Discretionary |
| Mar 2, 2023 | RGEN | $0 | Award | 8,348 | $N/A | Discretionary |
| Feb 28, 2023 | RGEN | $103.0K | Payment | 594 | $173.44 | Discretionary |
| Aug 3, 2022 | RGEN | $188.7K | Option Exercise | 2,000 | $94.33 | Discretionary |
| Aug 3, 2022 | RGEN | $480.8K | Sale | 2,000 | $240.40 | Discretionary |
| Apr 1, 2022 | RGEN | $63.0K | Payment | 335 | $188.02 | Discretionary |
| Feb 24, 2022 | RGEN | $35.6K | Payment | 188 | $189.21 | Discretionary |
| Feb 24, 2022 | RGEN | $0 | Award | 3,366 | $N/A | Discretionary |
| Feb 17, 2022 | RGEN | $0 | Award | 900 | $N/A | Discretionary |
| Feb 17, 2022 | RGEN | $60.9K | Payment | 334 | $182.42 | Discretionary |
| Apr 6, 2021 | RGEN | $73.5K | Sale | 360 | $204.25 | Discretionary |