Quanterix Corp — 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 |
|---|---|---|---|---|---|---|---|
| Sriram Vandana | Chief Financial Officer | Tax Withholding | 229 | $7.41 | $1,697 | 85,977 | Dec 15, 2025 |
| Toloue Masoud | President & CEO | Tax Withholding | 1,242 | $7.41 | $9,203 | 508,704 | Dec 15, 2025 |
| Toloue Masoud | President & CEO | Tax Withholding | 254 | $7.26 | $1,844 | 509,946 | Nov 30, 2025 |
| Sachs Alan Bruce | — | Award / Grant | 46,727 | — | — | 46,727 | Nov 20, 2025 |
| Hampton Malcolm Garret | — | Award / Grant | 46,727 | — | — | 46,727 | Nov 20, 2025 |
| Sriram Vandana | Chief Financial Officer | Tax Withholding | 229 | $5.78 | $1,324 | 86,206 | Nov 15, 2025 |
| Toloue Masoud | President & CEO | Tax Withholding | 1,242 | $5.74 | $7,129 | 510,200 | Nov 15, 2025 |
| Toloue Masoud | President & CEO | Tax Withholding | 254 | $5.34 | $1,356 | 511,442 | Oct 31, 2025 |
| Sriram Vandana | Chief Financial Officer | Tax Withholding | 229 | $5.78 | $1,324 | 86,742 | Oct 15, 2025 |
| Toloue Masoud | President & CEO | Tax Withholding | 1,242 | $5.78 | $7,179 | 511,696 | Oct 15, 2025 |
| LAI GOLDMAN MYLA | — | Award / Grant | 2,084 | $5.54 | $11,545 | 29,488 | Oct 1, 2025 |
| DONNELLY WILLIAM P | — | Award / Grant | 5,076 | $5.54 | $28,121 | 148,374 | Oct 1, 2025 |
| Mendel Scott | — | Award / Grant | 2,084 | $5.54 | $11,545 | 30,737 | Oct 1, 2025 |
| WALT DAVID R | — | Award / Grant | 2,594 | $5.54 | $14,371 | 1,871,675 | Oct 1, 2025 |
| Toloue Masoud | President & CEO | Tax Withholding | 254 | $5.43 | $1,379 | 512,938 | Sep 30, 2025 |
| Sriram Vandana | Chief Financial Officer | Tax Withholding | 229 | $4.97 | $1,138 | 86,971 | Sep 15, 2025 |
| Toloue Masoud | President & CEO | Tax Withholding | 1,242 | $4.97 | $6,173 | 513,192 | Sep 15, 2025 |
| Sriram Vandana | Chief Financial Officer | Purchase | 4,150 | $4.79 | $19,879 | 87,200 | Sep 12, 2025 |
| Toloue Masoud | President & CEO | Tax Withholding | 254 | $4.55 | $1,156 | 514,434 | Aug 31, 2025 |
| Sriram Vandana | Chief Financial Officer | Tax Withholding | 229 | $4.57 | $1,047 | 83,050 | Aug 15, 2025 |
| Toloue Masoud | President & CEO | Tax Withholding | 1,242 | $4.57 | $5,676 | 514,688 | Aug 15, 2025 |
| Toloue Masoud | President & CEO | Tax Withholding | 254 | $5.94 | $1,509 | 515,930 | Jul 31, 2025 |
| Sriram Vandana | Chief Financial Officer | Tax Withholding | 229 | $5.49 | $1,257 | 83,279 | Jul 15, 2025 |
| Toloue Masoud | President & CEO | Tax Withholding | 1,242 | $5.49 | $6,819 | 516,184 | Jul 15, 2025 |
| LAI GOLDMAN MYLA | — | Award / Grant | 2,940 | — | — | 2,940 | Jul 8, 2025 |
| Mendel Scott | — | Award / Grant | 4,189 | — | — | 4,189 | Jul 8, 2025 |
| Hlavinka Sarah E. | — | Award / Grant | 2,615 | $6.69 | $17,494 | 60,070 | Jul 1, 2025 |
| MEISTER PAUL M | — | Award / Grant | 2,242 | $6.69 | $14,999 | 309,279 | Jul 1, 2025 |
| DONNELLY WILLIAM P | — | Award / Grant | 4,204 | $6.69 | $28,125 | 143,298 | Jul 1, 2025 |
| WALT DAVID R | — | Award / Grant | 2,148 | $6.69 | $14,370 | 1,869,081 | Jul 1, 2025 |
| Toloue Masoud | President & CEO | Tax Withholding | 254 | $6.65 | $1,689 | 517,426 | Jun 30, 2025 |
| Toloue Masoud | President & CEO | Tax Withholding | 1,242 | $6.06 | $7,527 | 517,680 | Jun 15, 2025 |
| Sriram Vandana | Chief Financial Officer | Tax Withholding | 229 | $6.06 | $1,388 | 83,508 | Jun 15, 2025 |
| WALT DAVID R | — | Purchase | 123,990 | $6.14 | $761,299 | 1,866,933 | Jun 12, 2025 |
| Toloue Masoud | President & CEO | Purchase | 45,900 | $5.42 | $248,778 | 518,922 | Jun 9, 2025 |
| WALT DAVID R | — | Purchase | 78,131 | $5.34 | $417,220 | 1,706,933 | Jun 6, 2025 |
| DONNELLY WILLIAM P | — | Purchase | 93,113 | $5.44 | $506,535 | 139,094 | Jun 6, 2025 |
| Toloue Masoud | President & CEO | Tax Withholding | 254 | $5.20 | $1,321 | 473,022 | May 31, 2025 |
| Sriram Vandana | Chief Financial Officer | Tax Withholding | 229 | $4.50 | $1,031 | 83,737 | May 15, 2025 |
| Toloue Masoud | President & CEO | Tax Withholding | 1,242 | $4.50 | $5,589 | 473,276 | May 15, 2025 |
| Toloue Masoud | President & CEO | Tax Withholding | 254 | $5.76 | $1,463 | 474,518 | Apr 30, 2025 |
| Sriram Vandana | Chief Financial Officer | Tax Withholding | 229 | $5.36 | $1,227 | 83,966 | Apr 15, 2025 |
| Toloue Masoud | President & CEO | Tax Withholding | 1,242 | $5.16 | $6,409 | 474,772 | Apr 15, 2025 |
| WALT DAVID R | — | Award / Grant | 2,156 | $6.67 | $14,381 | 1,496,933 | Apr 1, 2025 |
| MEISTER PAUL M | — | Award / Grant | 2,479 | $6.67 | $16,535 | 307,037 | Apr 1, 2025 |
| Hlavinka Sarah E. | — | Award / Grant | 2,625 | $6.67 | $17,509 | 57,455 | Apr 1, 2025 |
| DONNELLY WILLIAM P | — | Award / Grant | 2,681 | $6.67 | $17,882 | 45,981 | Apr 1, 2025 |
| Toloue Masoud | President & CEO | Tax Withholding | 254 | $6.51 | $1,654 | 476,014 | Mar 31, 2025 |
| Toloue Masoud | President & CEO | Tax Withholding | 1,242 | $7.06 | $8,769 | 476,268 | Mar 15, 2025 |
| Sriram Vandana | Chief Financial Officer | Tax Withholding | 229 | $7.06 | $1,617 | 84,195 | Mar 15, 2025 |