According to recent filings covering the 90 days ending February 19, 2026, the three most significant insider holders at Standard Biotools are Director Partners Master Fund, L.P. Casdin (74.91Mn shares), TenPercentOwner Partners Lp Caligan (7.80Mn shares), Director Eli Casdin (5.65Mn shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Partners Master Fund, L.P. Casdin | 74,906,470 | 04 Mar, 2025 | |
| Partners Lp Caligan | 7,797,454 | 03 Jul, 2023 | |
| Eli Casdin | 5,645,281 | 24 Jun, 2025 | |
| Michael Egholm | President & Ceo | 5,617,837 | 24 Nov, 2025 |
| Hanjoon Alex Kim | Chief Financial Officer | 2,415,086 | 24 Nov, 2025 |
| Sean Mackay | Svp & Chief Business Officer | 779,835 | 24 Nov, 2025 |
| Jeffrey G. Black | Svp & Chief Financial Officer | 421,608 | 05 Sep, 2024 |
| Stephen Christopher Linthwaite | President & Ceo | 328,473 | 24 Feb, 2022 |
| Troy Cox | 256,412 | 24 Jun, 2025 | |
| Fenel M Eloi | 236,183 | 24 Jun, 2025 | |
| Vikram Jog | Chief Financial Officer | 217,622 | 23 Feb, 2023 |
| Frank Witney | 210,862 | 24 Jun, 2025 | |
| Nicolas Barthelemy | 204,077 | 04 Apr, 2022 | |
| Thomas D. Carey | 194,058 | 24 Jun, 2025 | |
| Kathy L Hibbs | 137,720 | 24 Jun, 2025 | |
| Carlos V Paya | 126,844 | 16 Jun, 2023 | |
| Bradley Allen Kreger | Svp And Global Operations | 119,157 | 23 May, 2022 |
| Laura Clague | 104,791 | 16 Jun, 2023 | |
| Martin D Madaus | 104,111 | 20 Oct, 2023 | |
| Nicholas Khadder | Svp And Gen. Counsel & Secretary | 100,480 | 03 Jun, 2022 |
| Gerhard F Burbach | 96,827 | 17 Jun, 2022 | |
| Colin Mccracken | Chief Commercial Officer | 65,103 | 24 Feb, 2022 |
| Bill Colston | 59,288 | 17 Jun, 2022 | |
| Ana K. Stankovic | 18,563 | 27 May, 2021 | |
| Jeremy Steven Davis | Svp Chief Commercial Officer | 14,657 | 23 Feb, 2023 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 04 Dec, 2025 | Partners Master Fund, L.P. Casdin | Common Stock, $0.001 par value per share | A | 150,000 | $1.45 | 72,100,000 | I | P |
| 03 Dec, 2025 | Partners Master Fund, L.P. Casdin | Common Stock, $0.001 par value per share | A | 75,000 | $1.44 | 71,950,000 | I | P |
| 02 Dec, 2025 | Partners Master Fund, L.P. Casdin | Common Stock, $0.001 par value per share | A | 125,000 | $1.42 | 71,875,000 | I | P |
| 25 Nov, 2025 | Partners Master Fund, L.P. Casdin | Common Stock, $0.001 par value per share | A | 7,550,000 | $1.30 | 71,750,000 | I | P |
| 24 Nov, 2025 | Partners Master Fund, L.P. Casdin | Common Stock, $0.001 par value per share | A | 150,000 | $1.43 | 64,200,000 | I | P |
| 20 Nov, 2025 | Partners Master Fund, L.P. Casdin | Common Stock, $0.001 par value per share | A | 450,000 | $1.30 | 64,050,000 | I | P |
| 20 Nov, 2025 | Michael Egholm | Common Stock | D | 63,529 | $1.28 | 5,617,837 | D | F |
| 20 Nov, 2025 | Sean Mackay | Common Stock | D | 19,661 | $1.28 | 779,835 | D | F |
| 20 Nov, 2025 | Hanjoon Alex Kim | Common Stock | D | 12,739 | $1.28 | 2,415,086 | D | F |
| 19 Nov, 2025 | Partners Master Fund, L.P. Casdin | Common Stock, $0.001 par value per share | A | 350,000 | $1.28 | 63,600,000 | I | P |
| 18 Nov, 2025 | Partners Master Fund, L.P. Casdin | Common Stock, $0.001 par value per share | A | 275,000 | $1.23 | 63,250,000 | I | P |
| 17 Nov, 2025 | Partners Master Fund, L.P. Casdin | Common Stock, $0.001 par value per share | A | 225,000 | $1.22 | 62,975,000 | I | P |
| 14 Nov, 2025 | Partners Master Fund, L.P. Casdin | Common Stock, $0.001 par value per share | A | 250,000 | $1.24 | 62,750,000 | I | P |
| 13 Nov, 2025 | Partners Master Fund, L.P. Casdin | Common Stock, $0.001 par value per share | A | 450,000 | $1.20 | 62,500,000 | I | P |
| 12 Nov, 2025 | Partners Master Fund, L.P. Casdin | Common Stock, $0.001 par value per share | A | 375,000 | $1.19 | 62,050,000 | I | P |
| 11 Nov, 2025 | Partners Master Fund, L.P. Casdin | Common Stock, $0.001 par value per share | A | 300,000 | $1.20 | 61,675,000 | I | P |
| 10 Nov, 2025 | Partners Master Fund, L.P. Casdin | Common Stock, $0.001 par value per share | A | 275,000 | $1.17 | 61,375,000 | I | P |
| 07 Nov, 2025 | Partners Master Fund, L.P. Casdin | Common Stock, $0.001 par value per share | A | 225,000 | $1.12 | 61,100,000 | I | P |
| 09 Sep, 2025 | Partners Master Fund, L.P. Casdin | Common Stock, $0.001 par value per share | A | 100,000 | $1.29 | 60,875,000 | I | P |
| 04 Sep, 2025 | Partners Master Fund, L.P. Casdin | Common Stock, $0.001 par value per share | A | 250,000 | $1.28 | 60,775,000 | I | P |