Reported relationships
Latest disclosed role at each company.
No relationships currently tracked through insider filings.
Disclosed balances
About these balances
Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.
No balances currently tracked through insider filings.
Past disclosures · reporting ended (1)
No longer tracked through insider filings. These historical balances do not imply present ownership or a zero position.
Quanterix Corp
Report date January 16, 2026 · Filed January 20, 2026
Section 16 reporting ended · disclosed 2026-01-20. Current position is not established by this disclosure.
| Security / award | Ownership account | Disclosed shares / units | Disclosure context |
|---|---|---|---|
| Common StockSEC Table I · non-derivative | Direct | 507,310 |
Reported balance
After 2026-01-15 transaction · row 1
Account or security details depend on footnotes; rows are not merged.
1 source rowRow 1 · 2026-01-15 · Tax withholding · Disposed 1,817 · Balance 507,310 F1: Shares withheld by Quanterix Corporation solely to cover tax obligations upon vesting of 3,722 restricted stock units (RSUs). F2: QTRX year-end reconciliation revealed a variance of 681 shares. Corrected balance as shown F3: Includes 206,398 RSUs. |
Filing footnotes · ownership attribution and instrument terms
F1: Shares withheld by Quanterix Corporation solely to cover tax obligations upon vesting of 3,722 restricted stock units (RSUs).
F2: QTRX year-end reconciliation revealed a variance of 681 shares. Corrected balance as shown
F3: Includes 206,398 RSUs.
Transaction history
JSON APIPurchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”
The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.
| Transaction date | Company | Activity / security | Shares / units | Reported price | Reported value | Details |
|---|---|---|---|---|---|---|
| February 29, 2024 Filed Mar 4, 2024 21:09 UTC | Quanterix Corp QTRX · Entity 6649 | Tax withholdingCommon Stock | 724 | $23.96 | $17,347.04 |
DisclosureSEC source: 0001562180-24-002070 · primarydocument.xml · nonDerivative · entry 1 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 344,678 F1 · shares: Shares withheld by Quanterix Corporation solely to cover tax obligations upon the vesting of 2,169 RSUs. F2 · balance_after: Includes 174,201 restricted stock units. Read SEC document |
| February 02, 2024 Filed Feb 6, 2024 21:07 UTC | Quanterix Corp QTRX · Entity 6649 | GrantStock Option (right to buy) · Derivative | 227,262 | $0.00 Strike: $23.10 | $0.00 |
DisclosureSEC source: 0001562180-24-001092 · primarydocument.xml · derivative · entry 3 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 227,262 Underlying: Common Stock · 227,262 shares Expires 2034-02-02 F4 · derivative.exercise_date: The option vests as to 25% of the shares on February 2, 2025, and the remaining 75% vests in 36 equal monthly installments on the 15th of each month beginning on March 15, 2025. Read SEC document |
| February 02, 2024 Filed Feb 6, 2024 21:07 UTC | Quanterix Corp QTRX · Entity 6649 | Tax withholdingCommon Stock | 8,397 | $23.10 | $193,970.70 |
DisclosureSEC source: 0001562180-24-001092 · primarydocument.xml · nonDerivative · entry 2 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 345,402 F2 · shares: Shares withheld by Quanterix Corporation solely to cover tax obligations upon the vesting of 27,794 RSUs. F3 · balance_after: Includes 176,370 restricted stock units. Read SEC document |
| February 02, 2024 Filed Feb 6, 2024 21:07 UTC | Quanterix Corp QTRX · Entity 6649 | GrantCommon Stock | 67,532 | $0.00 | $0.00 |
DisclosureSEC source: 0001562180-24-001092 · primarydocument.xml · nonDerivative · entry 1 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 353,799 F1 · shares: Represents shares of stock issuable on vesting of restricted stock units. The restricted stock units vest as to 25% of the shares on February 2, 2025, and the remaining 75% vest in 36 equal monthly installments on the 15th of each month beginning on March 15, 2025. Read SEC document |
| January 31, 2024 Filed Feb 1, 2024 21:52 UTC | Quanterix Corp QTRX · Entity 6649 | Tax withholdingCommon Stock | 763 | $22.09 | $16,854.67 |
DisclosureSEC source: 0001562180-24-000885 · primarydocument.xml · nonDerivative · entry 1 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 286,267 F1 · shares: Shares withheld by Quanterix Corporation solely to cover tax obligations upon the vesting of 2,169 RSUs. F2 · balance_after: Includes 136,632 restricted stock units. Read SEC document |
| December 31, 2023 Filed Jan 3, 2024 21:02 UTC | Quanterix Corp QTRX · Entity 6649 | Tax withholdingCommon Stock | 859 | $27.34 | $23,485.06 |
DisclosureSEC source: 0001562180-24-000088 · primarydocument.xml · nonDerivative · entry 1 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 287,030 F1 · shares: Shares withheld by Quanterix Corporation solely to cover tax obligations upon the vesting of 2,169 RSUs. F2 · balance_after: Includes 138,801 restricted stock units. Read SEC document |
| November 30, 2023 Filed Dec 1, 2023 21:05 UTC | Quanterix Corp QTRX · Entity 6649 | Tax withholdingCommon Stock | 638 | $23.97 | $15,292.86 |
DisclosureSEC source: 0001562180-23-008003 · primarydocument.xml · nonDerivative · entry 1 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 287,889 F1 · shares: Shares withheld by Quanterix Corporation solely to cover tax obligations upon the vesting of 2,169 RSUs. F2 · balance_after: Includes 140,970 restricted stock units. Read SEC document |
| October 31, 2023 Filed Nov 1, 2023 13:06 UTC | Quanterix Corp QTRX · Entity 6649 | Tax withholdingCommon Stock | 638 | $21.72 | $13,857.36 |
DisclosureSEC source: 0001562180-23-007468 · primarydocument.xml · nonDerivative · entry 1 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 288,527 F1 · shares: Shares withheld by Quanterix Corporation solely to cover tax obligations upon the vesting of 2,169 RSUs. F2 · balance_after: Includes 143,139 restricted stock units. Read SEC document |
| September 30, 2023 Filed Oct 2, 2023 21:42 UTC | Quanterix Corp QTRX · Entity 6649 | Tax withholdingCommon Stock | 638 | $27.14 | $17,315.32 |
DisclosureSEC source: 0001562180-23-007087 · primarydocument.xml · nonDerivative · entry 1 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 289,165 F1 · shares: Shares withheld by Quanterix Corporation solely to cover tax obligations upon the vesting of 2,169 RSUs. F2 · balance_after: Includes 145,308 restricted stock units. Read SEC document |
| August 31, 2023 Filed Sep 6, 2023 20:39 UTC | Quanterix Corp QTRX · Entity 6649 | Tax withholdingCommon Stock | 638 | $26.80 | $17,098.40 |
DisclosureSEC source: 0001562180-23-006739 · primarydocument.xml · nonDerivative · entry 1 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 289,803 F1 · shares: Shares withheld by Quanterix Corporation solely to cover tax obligations upon the vesting of 2,169 RSUs. F2 · balance_after: Includes 147,477 restricted stock units. Read SEC document |
| July 31, 2023 Filed Aug 2, 2023 20:21 UTC | Quanterix Corp QTRX · Entity 6649 | Tax withholdingCommon Stock | 638 | $24.84 | $15,847.92 |
DisclosureSEC source: 0001562180-23-006114 · primarydocument.xml · nonDerivative · entry 1 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 290,441 F1 · shares: Shares withheld by Quanterix Corporation solely to cover tax obligations upon the vesting of 2,169 RSUs. F2 · balance_after: Includes 149,646 restricted stock units. Read SEC document |
| June 30, 2023 Filed Jul 5, 2023 20:13 UTC | Quanterix Corp QTRX · Entity 6649 | Tax withholdingCommon Stock | 638 | $22.55 | $14,386.90 |
DisclosureSEC source: 0001562180-23-005689 · primarydocument.xml · nonDerivative · entry 1 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 291,079 F1 · shares: Shares withheld by Quanterix Corporation solely to cover tax obligations upon the vesting of 2,169 RSUs. F2 · balance_after: Includes 151,815 restricted stock units. Read SEC document |
| May 31, 2023 Filed Jun 2, 2023 20:02 UTC | Quanterix Corp QTRX · Entity 6649 | Tax withholdingCommon Stock | 638 | $19.61 | $12,511.18 |
DisclosureSEC source: 0001562180-23-004720 · primarydocument.xml · nonDerivative · entry 1 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 291,717 F1 · shares: Shares withheld by Quanterix Corporation solely to cover tax obligations upon the vesting of 2,169 RSUs. F2 · balance_after: Includes 153,984 restricted stock units. Read SEC document |
| April 30, 2023 Filed May 2, 2023 20:00 UTC | Quanterix Corp QTRX · Entity 6649 | Tax withholdingCommon Stock | 638 | $12.64 | $8,064.32 |
DisclosureSEC source: 0001562180-23-003804 · primarydocument.xml · nonDerivative · entry 2 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 292,355 F3 · shares: Shares withheld by Quanterix Corporation solely to cover tax obligations upon the vesting of 2,169 RSUs. F4 · balance_after: Includes 156,153 restricted stock units. Read SEC document |
| April 25, 2023 Filed May 2, 2023 20:00 UTC | Quanterix Corp QTRX · Entity 6649 | Tax withholdingCommon Stock | 2,683 | $11.67 | $31,310.61 |
DisclosureSEC source: 0001562180-23-003804 · primarydocument.xml · nonDerivative · entry 1 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 292,993 F1 · shares: Shares withheld by Quanterix Corporation solely to cover tax obligations upon the vesting of 9,140 RSUs. F2 · balance_after: Includes 158,322 restricted stock units. Read SEC document |
| March 31, 2023 Filed Apr 3, 2023 20:03 UTC | Quanterix Corp QTRX · Entity 6649 | Tax withholdingCommon Stock | 414 | $11.27 | $4,665.78 |
DisclosureSEC source: 0001562180-23-003220 · primarydocument.xml · nonDerivative · entry 1 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 295,676 F1 · shares: Shares withheld by Quanterix Corporation solely to cover tax obligations upon the vesting of 1,408 RSUs. F2 · balance_after: Includes 167,462 restricted stock units. Read SEC document |
| February 28, 2023 Filed Mar 1, 2023 22:29 UTC | Quanterix Corp QTRX · Entity 6649 | Tax withholdingCommon Stock | 418 | $11.00 | $4,598.00 |
DisclosureSEC source: 0001562180-23-002062 · primarydocument.xml · nonDerivative · entry 1 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 296,090 F1 · shares: Shares withheld by Quanterix Corporation solely to cover tax obligations upon the vesting of 1,408 RSUs. F2 · balance_after: Includes 168,870 restricted stock units. Read SEC document |
| February 02, 2023 Filed Feb 6, 2023 21:07 UTC | Quanterix Corp QTRX · Entity 6649 | GrantStock Option (right to buy) · Derivative | 259,416 | $0.00 Strike: $14.82 | $0.00 |
DisclosureSEC source: 0001562180-23-001028 · primarydocument.xml · derivative · entry 2 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 259,416 Underlying: Common Stock · 259,416 shares Expires 2033-02-02 F3 · derivative.exercise_date: The option vests as to 25% of the shares on February 2, 2024, and the remaining 75% vests in 36 equal monthly installments at the end of each month beginning on March 15, 2024. Read SEC document |
| February 02, 2023 Filed Feb 6, 2023 21:07 UTC | Quanterix Corp QTRX · Entity 6649 | GrantCommon Stock | 111,178 | $0.00 | $0.00 |
DisclosureSEC source: 0001562180-23-001028 · primarydocument.xml · nonDerivative · entry 1 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 296,508 F1 · shares: Represents shares of stock issuable on vesting of restricted stock units. The restricted stock units vest as to 25% of the shares on February 2, 2024, and the remaining 75% vest in 36 equal monthly installments at the end of each month beginning on March 15, 2024. F2 · balance_after: Includes 170,278 restricted stock units. Read SEC document |
| January 31, 2023 Filed Feb 2, 2023 21:05 UTC | Quanterix Corp QTRX · Entity 6649 | Tax withholdingCommon Stock | 493 | $14.13 | $6,966.09 |
DisclosureSEC source: 0001562180-23-000829 · primarydocument.xml · nonDerivative · entry 1 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 185,330 F1 · shares: Shares withheld by Quanterix Corporation solely to cover tax obligations upon the vesting of 1,408 RSUs. F2 · balance_after: Includes 59,100 restricted stock units. Read SEC document |
| August 12, 2022 Filed Aug 16, 2022 20:53 UTC | Quanterix Corp QTRX · Entity 6649 | PurchaseCommon Stock | 105,000 | $10.43 | $1,095,150.00 |
DisclosureSEC source: 0001562180-22-006118 · primarydocument.xml · nonDerivative · entry 1 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 185,823 F1 · kind: The purchase of shares reported herein was matchable under Section 16(b) of the Securities Exchange Act of 1934 with Dr. Toloue's sale of 5,564 shares on June 13, 2022, 432 shares on July 5, 2022 and 446 shares on August 1, 2022, each of which was made to cover taxes upon the vesting of RSUs. Dr. Toloue has agreed to pay Quanterix Corporation $33,350.20, representing the full amount of the profit realized in connection with the short-swing transaction. F2 · price: This transaction was executed in multiple trades at prices ranging from $10.1101 to $10.50. The price reported reflects the weighted average purchase price. The reporting person undertakes to provide upon request to the SEC staff, the issuer or any security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. F3 · balance_after: Includes 67,548 restricted stock units. Read SEC document |
| August 01, 2022 Filed Aug 3, 2022 20:02 UTC | Quanterix Corp QTRX · Entity 6649 | SaleCommon Stock | 446 | $15.61 | $6,964.16 |
DisclosureSEC source: 0001562180-22-005862 · primarydocument.xml · nonDerivative · entry 1 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 80,823 F1 · shares: The sales of shares reported on this Form 4 were made solely to cover tax obligations upon the vesting of 1,408 RSUs. F2 · price: This transaction was executed in multiple trades at prices ranging from $15.58 to $15.6412. The price reported reflects the weighted average sale price. The reporting person undertakes to provide upon request to the SEC staff, the issuer or any security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. F3 · balance_after: Includes 67,548 restricted stock units. Read SEC document |
| July 05, 2022 Filed Jul 6, 2022 20:07 UTC | Quanterix Corp QTRX · Entity 6649 | SaleCommon Stock | 432 | $16.57 | $7,157.76 |
DisclosureSEC source: 0001562180-22-005563 · primarydocument.xml · nonDerivative · entry 1 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 81,269 F1 · shares: The sales of shares reported on this Form 4 were made solely to cover tax obligations upon the vesting of 1,408 RSUs. F2 · price: This transaction was executed in multiple trades at prices ranging from $16.18 to $17.10. The price reported reflects the weighted average sale price. The reporting person undertakes to provide upon request to the SEC staff, the issuer or any security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. F3 · balance_after: Includes 68,956 restricted stock units. Read SEC document |
| June 13, 2022 Filed Jun 14, 2022 20:12 UTC | Quanterix Corp QTRX · Entity 6649 | SaleCommon Stock | 5,564 | $15.27 | $84,955.05 |
DisclosureSEC source: 0001562180-22-005099 · primarydocument.xml · nonDerivative · entry 1 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 81,701 F1 · shares: The sales of shares reported on this Form 4 were made solely to cover tax obligations upon the vesting of 16,901 RSUs. F2 · price: This transaction was executed in multiple trades at prices ranging from $14.86 to $15.84. The price reported reflects the weighted average sale price. The reporting person undertakes to provide upon request to the SEC staff, the issuer or any security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. F3 · balance_after: Includes 70,364 restricted stock units. Read SEC document |
| April 25, 2022 Filed Apr 27, 2022 20:02 UTC | Quanterix Corp QTRX · Entity 6649 | GrantStock Options (Right to buy) · Derivative | 85,312 | $0.00 Strike: $24.40 | $0.00 |
DisclosureSEC source: 0001562180-22-003551 · primarydocument.xml · derivative · entry 2 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 85,312 Underlying: Common Stock · 85,312 shares Expires 2032-04-25 F3 · derivative.exercise_date: The option vests as to 25% of the shares on April 25, 2023, and the remaining 75% vests in 36 equal monthly installments at the end of each month beginning on April 30, 2023. Read SEC document |
| April 25, 2022 Filed Apr 27, 2022 20:02 UTC | Quanterix Corp QTRX · Entity 6649 | GrantCommon Stock | 36,562 | $0.00 | $0.00 |
DisclosureSEC source: 0001562180-22-003551 · primarydocument.xml · nonDerivative · entry 1 Toloue Masoud · CIK 0001867276 · Director · President & CEO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 87,265 F1 · shares: Represents shares of stock issuable upon vesting of restricted stock units (RSUs). The RSUs vest as to 25% of the shares on April 25, 2023, with the remaining 75% vesting in 36 equal monthly installments at the end of each month thereafter beginning on April 30, 2023. F2 · balance_after: Includes 87,265 restricted stock units. Read SEC document |
| June 09, 2021 Filed Jun 14, 2021 17:48 UTC | Quanterix Corp QTRX · Entity 6649 | GrantCommon Stock | 50,703 | $0.00 | $0.00 |
DisclosureSEC source: 0001562180-21-004228 · primarydocument.xml · nonDerivative · entry 1 Toloue Masoud · CIK 0001867276 · President, Quanterix & Dx 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 50,703 F1 · shares: Represents shares of stock issuable upon vesting of restricted stock units (RSUs). The RSUs vest as to 1/3 of the shares on June 9, 2022, with the remaining 2/3 vesting in 24 equal monthly installments at the end of each month thereafter beginning on June 30, 2022. F2 · balance_after: Includes 50,703 restricted stock units. Read SEC document |
Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.