| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| AMERIPRISE FINANCIAL INC | 11% | +18% | $33,123,964 | +$4,989,479 | 4,996,073 | +18% | Ameriprise Financial, Inc. | 31 Dec 2025 |
| Portolan Capital Management, LLC | 9.4% | +22% | $21,402,034 | +$3,947,625 | 3,633,622 | +23% | Portolan Capital Management, LLC | 30 Jun 2025 |
| BlackRock, Inc. | 7.3% | $18,911,004 | 2,843,760 | BlackRock, Inc. | 30 Jun 2025 | |||
| VANGUARD GROUP INC | 6.5% | $14,143,802 | 2,525,679 | The Vanguard Group | 31 Mar 2025 | |||
| Telegraph Hill Partners III, L.P. | 5.4% | $12,523,240 | 2,504,648 | Telegraph Hill Partners III, L.P. | 30 Sep 2025 | |||
| Kent Lake PR LLC | 4.5% | -34% | $13,894,548 | -$3,694,480 | 2,089,500 | -21% | Kent Lake PR LLC | 11 Jul 2025 |
| ALLIANCEBERNSTEIN L.P. | 0.1% | -103% | $207,088 | -$13,455,820 | 36,980 | -98% | AllianceBernstein L.P. | 31 Mar 2025 |
As of 31 Dec 2025, 130 institutional investors reported holding 35,111,331 shares of Quanterix Corp - Common Stock (QTRX). This represents 75% of the company’s total 46,692,271 outstanding shares.
The largest institutional shareholders of Quanterix Corp - Common Stock (QTRX) together control 66% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| AMERIPRISE FINANCIAL INC | 11% | 4,996,073 | +18% | 0.01% | $31,775,037 |
| Portolan Capital Management, LLC | 9.7% | 4,525,553 | +6.2% | 1.5% | $28,782,517 |
| BlackRock, Inc. | 7.2% | 3,375,910 | +8.4% | 0% | $21,470,788 |
| VANGUARD GROUP INC | 5.7% | 2,677,833 | +1.1% | 0% | $17,031,018 |
| Blue Water Life Science Advisors, LP | 4.5% | 2,092,147 | +118% | 8.4% | $13,306,055 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 4.4% | 2,046,449 | +56% | 0.04% | $13,015,416 |
| Invenomic Capital Management LP | 3.2% | 1,505,208 | +8.1% | 0.46% | $9,573,123 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.3% | 1,073,967 | +6.1% | 0% | $6,832,078 |
| STATE STREET CORP | 1.9% | 893,401 | +9% | 0% | $5,682,030 |
| MORGAN STANLEY | 1.8% | 822,998 | +2.1% | 0% | $5,234,270 |
| Trium Capital LLP | 1.8% | 817,451 | +19% | 4% | $5,198,988 |
| Williams Jones Wealth Management, LLC. | 1.4% | 638,939 | -6.9% | 0.05% | $4,063,652 |
| Empire Financial Management Company, LLC | 1.3% | 617,830 | +37% | 0.85% | $3,929,398 |
| EASTERLY INVESTMENT PARTNERS LLC | 1.3% | 616,681 | -51% | 0.24% | $3,922,091 |
| Tikvah Management LLC | 1.2% | 571,619 | 0% | 0.99% | $3,635,497 |
| First Eagle Investment Management, LLC | 1.1% | 531,427 | 0.01% | $3,379,876 | |
| MILLENNIUM MANAGEMENT LLC | 0.86% | 402,631 | -67% | 0% | $2,560,733 |
| DIMENSIONAL FUND ADVISORS LP | 0.83% | 389,466 | -45% | 0% | $2,476,911 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0.78% | 362,740 | +9.5% | 0% | $2,307,023 |
| NORTHERN TRUST CORP | 0.74% | 345,564 | -2.3% | 0% | $2,197,787 |
| Parkman Healthcare Partners LLC | 0.7% | 328,956 | +30% | 0.2% | $2,092,160 |
| UBS Group AG | 0.67% | 311,499 | -17% | 0% | $1,981,134 |
| TWO SIGMA INVESTMENTS, LP | 0.55% | 258,858 | +3.5% | 0% | $1,646,337 |
| Russell Investments Group, Ltd. | 0.55% | 256,140 | -41% | 0% | $1,629,050 |
| ENVESTNET ASSET MANAGEMENT INC | 0.54% | 252,211 | -51% | 0% | $1,604,062 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 35,111,331 | $223,262,497 | +$4,851,156 | $6.36 | 130 |
| 2025 Q3 | 35,667,301 | $193,650,925 | +$2,747,151 | $5.43 | 127 |
| 2025 Q2 | 34,706,219 | $230,800,985 | -$1,229,254 | $6.65 | 135 |
| 2025 Q1 | 35,052,627 | $228,183,737 | -$13,775,858 | $6.51 | 147 |
| 2024 Q4 | 34,986,611 | $371,914,799 | +$16,121,868 | $10.63 | 149 |
| 2024 Q3 | 33,241,563 | $430,807,040 | +$1,578,585 | $12.96 | 148 |
| 2024 Q2 | 32,444,291 | $428,581,553 | -$24,339,668 | $13.21 | 154 |
| 2024 Q1 | 32,304,424 | $761,091,215 | +$14,149,198 | $23.56 | 162 |
| 2023 Q4 | 31,606,543 | $864,126,575 | -$24,356,227 | $27.34 | 171 |
| 2023 Q3 | 32,368,786 | $878,491,034 | -$2,866,513 | $27.14 | 157 |
| 2023 Q2 | 32,508,081 | $733,059,314 | +$7,550,645 | $22.55 | 136 |
| 2023 Q1 | 32,857,738 | $370,299,549 | +$10,875,738 | $11.27 | 134 |
| 2022 Q4 | 31,640,627 | $438,223,400 | +$20,742,320 | $13.85 | 128 |
| 2022 Q3 | 29,860,035 | $329,002,411 | -$53,914,115 | $11.02 | 137 |
| 2022 Q2 | 32,056,174 | $519,013,659 | -$13,420,976 | $16.19 | 126 |
| 2022 Q1 | 32,058,199 | $935,417,025 | +$5,961,086 | $29.19 | 137 |
| 2021 Q4 | 31,614,679 | $1,339,716,574 | +$25,726,485 | $42.40 | 148 |
| 2021 Q3 | 30,798,959 | $1,533,673,090 | +$40,652,565 | $49.79 | 148 |
| 2021 Q2 | 29,988,923 | $1,759,555,578 | +$118,333,332 | $58.66 | 156 |
| 2021 Q1 | 28,296,161 | $1,655,248,478 | +$302,307,999 | $58.47 | 158 |
| 2020 Q4 | 23,236,863 | $1,081,130,529 | +$57,531,970 | $46.50 | 139 |
| 2020 Q3 | 22,662,885 | $764,777,296 | +$79,015,895 | $33.74 | 110 |
| 2020 Q2 | 20,335,622 | $556,955,810 | +$25,091,575 | $27.39 | 88 |
| 2020 Q1 | 19,579,910 | $359,723,891 | -$8,112,263 | $18.37 | 80 |
| 2019 Q4 | 19,760,825 | $466,933,253 | +$19,216,424 | $23.63 | 82 |
| 2019 Q3 | 18,912,293 | $415,310,210 | +$116,253,289 | $21.96 | 86 |
| 2019 Q2 | 13,456,355 | $454,666,714 | +$139,461,201 | $33.79 | 86 |
| 2019 Q1 | 9,409,606 | $243,046,269 | +$4,038,727 | $25.83 | 67 |
| 2018 Q4 | 11,619,932 | $212,758,568 | +$6,126,624 | $18.31 | 59 |
| 2018 Q3 | 8,992,253 | $192,610,384 | +$4,336,602 | $21.42 | 50 |
| 2018 Q2 | 8,830,428 | $126,807,231 | +$11,234,140 | $14.36 | 45 |
| 2018 Q1 | 10,039,558 | $170,571,569 | +$6,281,533 | $17.04 | 40 |
| 2017 Q4 | 9,515,854 | $203,688,000 | +$203,688,000 | $21.47 | 31 |