STANDARD BIOTOOLS INC. — Insider Transactions
Form 4 filings by directors, officers, and 10%+ shareholders
SEC rules require corporate insiders — including directors, executive officers, and any shareholder owning more than 10% of a company's shares — to report changes in their ownership within two business days of a transaction. These disclosures are filed as Form 4. Open-market purchases (code P) are generally considered the most meaningful signal, as insiders are spending their own money.
| Insider | Title | Type | Shares | Price | Value | Owns After | Date |
|---|---|---|---|---|---|---|---|
| CASDIN PRIVATE GROWTH EQUITY FUND GP, LLC | — | Purchase | 150,000 | $1.45 | $217,500 | 72,100,000 | Dec 3, 2025 |
| Casdin Partners GP, LLC | — | Purchase | 150,000 | $1.43 | $214,500 | 64,200,000 | Nov 25, 2025 |
| Egholm Michael | President & CEO | Tax Withholding | 63,529 | $1.28 | $81,317 | 5,617,837 | Nov 20, 2025 |
| Kim Hanjoon Alex | Chief Financial Officer | Tax Withholding | 12,739 | $1.28 | $16,306 | 2,415,086 | Nov 20, 2025 |
| Mackay Sean | SVP & Chief Business Officer | Tax Withholding | 19,661 | $1.28 | $25,166 | 779,835 | Nov 20, 2025 |
| Casdin Eli | — | Purchase | 350,000 | $1.28 | $448,000 | 63,600,000 | Nov 20, 2025 |
| Casdin Partners Master Fund, L.P. | — | Purchase | 250,000 | $1.24 | $310,000 | 62,750,000 | Nov 17, 2025 |
| Casdin Partners GP, LLC | — | Purchase | 275,000 | $1.17 | $321,750 | 61,375,000 | Nov 7, 2025 |
| Casdin Partners Master Fund, L.P. | — | Purchase | 100,000 | $1.29 | $129,000 | 60,875,000 | Sep 9, 2025 |
| Casdin Eli | — | Purchase | 250,000 | $1.27 | $317,500 | 60,525,000 | Sep 4, 2025 |
| Casdin Partners Master Fund, L.P. | — | Purchase | 125,000 | $1.26 | $157,500 | 60,275,000 | Aug 25, 2025 |
| Egholm Michael | President & CEO | Tax Withholding | 54,919 | $1.27 | $69,747 | 5,681,366 | Aug 20, 2025 |
| Mackay Sean | SVP & Chief Business Officer | Tax Withholding | 19,661 | $1.27 | $24,969 | 799,496 | Aug 20, 2025 |
| Kim Hanjoon Alex | Chief Financial Officer | Tax Withholding | 12,739 | $1.27 | $16,179 | 2,427,825 | Aug 20, 2025 |
| Casdin Eli | — | Purchase | 150,000 | $1.22 | $183,000 | 59,750,000 | Aug 13, 2025 |
| Kim Hanjoon Alex | Chief Financial Officer | Award / Grant | 1,500,000 | — | — | 2,440,564 | Aug 1, 2025 |
| Egholm Michael | President & CEO | Award / Grant | 3,000,000 | — | — | 5,736,285 | Aug 1, 2025 |
| Cox Troy | — | Award / Grant | 94,592 | — | — | 256,412 | Jun 20, 2025 |
| ELOI FENEL M | — | Award / Grant | 94,592 | — | — | 236,183 | Jun 20, 2025 |
| Carey Thomas D. | — | Award / Grant | 94,592 | — | — | 194,058 | Jun 20, 2025 |
| Casdin Eli | — | Award / Grant | 94,592 | — | — | 2,901,062 | Jun 20, 2025 |
| HIBBS KATHY L | — | Award / Grant | 94,592 | — | — | 137,720 | Jun 20, 2025 |
| Witney Frank | — | Award / Grant | 94,592 | — | — | 210,862 | Jun 20, 2025 |
| Mackay Sean | SVP & Chief Business Officer | Tax Withholding | 23,919 | $1.09 | $26,072 | 819,157 | May 28, 2025 |
| Egholm Michael | President & CEO | Tax Withholding | 9,906 | $1.09 | $10,798 | 2,731,285 | May 28, 2025 |
| Kim Hanjoon Alex | Chief Financial Officer | Tax Withholding | 2,583 | $1.09 | $2,815 | 927,703 | May 28, 2025 |
| Kim Hanjoon Alex | Chief Financial Officer | Sale | 1,428 | $0.94 | $1,342 | 930,286 | May 23, 2025 |
| Mackay Sean | SVP & Chief Business Officer | Sale | 13,217 | $0.94 | $12,424 | 843,076 | May 23, 2025 |
| Egholm Michael | President & CEO | Sale | 5,473 | $0.94 | $5,145 | 2,741,191 | May 23, 2025 |
| Kim Hanjoon Alex | Chief Financial Officer | Sale | 1,355 | $1.00 | $1,355 | 931,714 | May 22, 2025 |
| Egholm Michael | President & CEO | Sale | 5,116 | $1.00 | $5,116 | 2,746,664 | May 22, 2025 |
| Mackay Sean | SVP & Chief Business Officer | Sale | 12,838 | $1.03 | $13,223 | 868,829 | May 22, 2025 |
| Egholm Michael | President & CEO | Sale | 4,719 | $1.03 | $4,861 | 2,751,780 | May 20, 2025 |
| Kim Hanjoon Alex | Chief Financial Officer | Sale | 1,407 | $1.03 | $1,449 | 933,069 | May 20, 2025 |
| Egholm Michael | President & CEO | Tax Withholding | 57,676 | $1.07 | $61,713 | 2,774,842 | Apr 4, 2025 |
| Kim Hanjoon Alex | Chief Financial Officer | Option Exercise | 70,183 | — | — | 962,281 | Apr 4, 2025 |
| Kim Hanjoon Alex | Chief Financial Officer | Award / Grant | 338,333 | — | — | 892,098 | Mar 21, 2025 |
| Mackay Sean | SVP & Chief Business Officer | Award / Grant | 281,667 | — | — | 881,667 | Mar 21, 2025 |
| Egholm Michael | President & CEO | Award / Grant | 1,188,333 | — | — | 2,636,006 | Mar 21, 2025 |
| Casdin Capital, LLC | — | Award / Grant | 58,215 | $1.07 | $62,290 | 2,806,470 | Feb 28, 2025 |
| Carey Thomas D. | — | Award / Grant | 56,338 | $1.07 | $60,282 | 99,466 | Feb 28, 2025 |
| Cox Troy | — | Award / Grant | 62,910 | $1.07 | $67,314 | 224,730 | Feb 28, 2025 |
| Egholm Michael | President & CEO | Tax Withholding | 31,031 | $1.39 | $43,133 | 1,447,673 | Feb 20, 2025 |
| Egholm Michael | President & CEO | Tax Withholding | 28,795 | $1.51 | $43,480 | 1,473,704 | Nov 20, 2024 |
| Casdin Private Growth Equity Fund, L.P. | — | Purchase | 250,000 | $2.19 | $547,500 | 54,025,821 | Aug 27, 2024 |
| CASDIN PRIVATE GROWTH EQUITY FUND GP, LLC | — | Purchase | 307,900 | $1.96 | $603,484 | 53,333,721 | Aug 26, 2024 |
| Black Jeffrey G. | SVP & Chief Financial Officer | Tax Withholding | 6,690 | $1.91 | $12,778 | 421,608 | Aug 20, 2024 |
| Egholm Michael | President & CEO | Tax Withholding | 29,093 | $1.91 | $55,568 | 1,502,499 | Aug 20, 2024 |
| Casdin Amplify Fund, LP | — | Purchase | 500,000 | $1.90 | $950,000 | 53,025,821 | Aug 19, 2024 |
| Black Jeffrey G. | SVP & Chief Financial Officer | Option Exercise | 13,157 | — | — | 432,993 | Aug 15, 2024 |