As of April 28, 2026, the three largest insider holders of BLFS are Partners Master Fund, L.P. Casdin (TenPercentOwner, 8.74Mn shares), Partners Master Fund, L.P. Casdin (TenPercentOwner, 8.71Mn shares), Partners Master Fund, L.P. Casdin (TenPercentOwner, 7.71Mn shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Partners Master Fund, L.P. Casdin | - | 0 | 8,735,159 | 09 Apr, 2025 |
| Partners Master Fund, L.P. Casdin | - | 8,707,165 | 0 | 02 May, 2024 |
| Partners Master Fund, L.P. Casdin | - | 0 | 7,707,165 | 12 Jun, 2025 |
| Partners Master Fund, L.P. Casdin | - | 0 | 7,207,165 | 13 Aug, 2025 |
| Partners Master Fund, L.P. Casdin | - | 0 | 6,707,165 | 21 Aug, 2025 |
| Partners Master Fund, L.P. Casdin | - | 0 | 5,957,165 | 17 Oct, 2025 |
| Greef Roderick De | President And Ceo | 733,746 | 0 | 23 Mar, 2026 |
| Aby J. Mathew | Evp Chief Scientific Officer | 390,682 | 0 | 23 Mar, 2026 |
| Aby J. Mathew | Evp Chief Scientific Officer | 390,167 | 0 | 10 Apr, 2026 |
| Michael Rice | Chief Executive Officer | 347,085 | 0 | 01 Nov, 2023 |
| Michael Rice | Chief Executive Officer | 347,085 | 0 | 01 Nov, 2023 |
| Troy Wichterman | Chief Financial Officer | 216,056 | 0 | 10 Apr, 2026 |
| Todd Berard | Chief Marketing Officer | 163,768 | 0 | 10 Apr, 2026 |
| Garrie Richardson | Chief Revenue Officer | 114,773 | 0 | 18 Sep, 2024 |
| Garrie Richardson | Chief Revenue Officer | 114,773 | 0 | 18 Sep, 2024 |
| Karen A. Foster | Chief Quality And Operations | 108,758 | 0 | 31 Mar, 2026 |
| Karen A. Foster | Chief Quality And Operations | 108,758 | 0 | 31 Mar, 2026 |
| Sarah Aebersold | Chief Human Resources Officer | 92,429 | 0 | 23 Mar, 2026 |
| Geraint Phillips | Svp, Global Operations | 65,998 | 0 | 12 Mar, 2024 |
| Geraint Phillips | Svp, Global Operations | 65,998 | 0 | 12 Mar, 2024 |
| Rachel Ellingson | - | 57,995 | 0 | 26 Feb, 2026 |
| Joydeep Goswami | - | 53,156 | 0 | 26 Feb, 2026 |
| Sean Werner | Chief Technology Officer | 48,251 | 0 | 23 Mar, 2026 |
| Sean Werner | Chief Technology Officer | 48,251 | 0 | 23 Mar, 2026 |
| Timothy L. Moore | - | 44,943 | 0 | 26 Feb, 2026 |
| Timothy L. Moore | - | 44,943 | 0 | 26 Feb, 2026 |
| Joseph C Schick | - | 43,953 | 0 | 12 Mar, 2024 |
| Joseph C Schick | - | 43,953 | 0 | 12 Mar, 2024 |
| Marcus Schulz | Chief Revenue Officer | 42,097 | 0 | 29 Aug, 2023 |
| Marcus Schulz | Chief Revenue Officer | 42,097 | 0 | 29 Aug, 2023 |
| Sarah Aebersold | Vp, Global Human Resources | 32,441 | 0 | 26 Jul, 2022 |
| Amy Duross | - | 26,857 | 0 | 26 Feb, 2026 |
| Amy Duross | - | 26,857 | 0 | 26 Feb, 2026 |
| Andrew G Hinson | - | 17,675 | 0 | 18 Aug, 2021 |
| Andrew G Hinson | - | 17,675 | 0 | 18 Aug, 2021 |
| Catherine Coste | - | 13,871 | 0 | 26 Feb, 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.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 08 Apr, 2026 | Todd Berard | Common Stock | D | 293 | $19.27 | 163,768 | D | F |
| 08 Apr, 2026 | Troy Wichterman | Common Stock | D | 844 | $19.27 | 216,056 | D | F |
| 08 Apr, 2026 | Aby J. Mathew | Common Stock | D | 515 | $19.27 | 390,167 | D | F |
| 23 Mar, 2026 | Karen A. Foster | Common Stock | D | 2,577 | $19.17 | 108,758 | D | S |
| 23 Mar, 2026 | Karen A. Foster | Common Stock | D | 2,577 | $19.17 | 108,758 | D | S |
| 19 Mar, 2026 | Aby J. Mathew | Common Stock | D | 2,255 | $19.12 | 390,682 | D | F |
| 19 Mar, 2026 | Karen A. Foster | Common Stock | D | 1,907 | $19.12 | 111,335 | D | F |
| 19 Mar, 2026 | Greef Roderick De | Common Stock | D | 11,101 | $19.12 | 733,746 | D | F |
| 19 Mar, 2026 | Sarah Aebersold | Common Stock | D | 931 | $19.12 | 92,429 | D | F |
| 19 Mar, 2026 | Sean Werner | Common Stock | D | 1,681 | $19.12 | 48,251 | D | F |
| 19 Mar, 2026 | Karen A. Foster | Common Stock | D | 1,907 | $19.12 | 111,335 | D | F |
| 19 Mar, 2026 | Troy Wichterman | Common Stock | D | 3,749 | $19.12 | 216,900 | D | F |
| 19 Mar, 2026 | Todd Berard | Common Stock | D | 1,879 | $19.12 | 164,061 | D | F |
| 19 Mar, 2026 | Sean Werner | Common Stock | D | 1,681 | $19.12 | 48,251 | D | F |
| 19 Mar, 2026 | Aby J. Mathew | Common Stock | D | 2,255 | $19.12 | 390,682 | D | F |
| 05 Mar, 2026 | Karen A. Foster | Common Stock | D | 96,923 | $20.15 | 113,742 | D | S |
| 05 Mar, 2026 | Karen A. Foster | Common Stock | D | 96,923 | $20.15 | 113,742 | D | S |
| 09 Mar, 2026 | Karen A. Foster | Common Stock | D | 500 | $20.00 | 113,242 | D | S |
| 09 Mar, 2026 | Karen A. Foster | Common Stock | D | 500 | $20.00 | 113,242 | D | S |
| 03 Mar, 2026 | Aby J. Mathew | Common Stock | D | 529 | $20.74 | 392,937 | D | S |