QUANTERIX CORP (QTRX)
Institutional ownership reported to the SEC as of Q2 2026, across 31 quarters.
131
Reporting holders
$127.7M
Reported value
61.9%
Of shares outstanding
1.1%
Held as options
+9
Holder change
Institutions report 29,259,467 shares against 47,293,065 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end.
Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| BlackRock, Inc. | $15.7M | 3,635,411 | 0.00% | 8q | +10.9%+$1.5M |
| Blue Water Life Science Advisors, LP | $15.0M | 3,474,202 | 9.45% | 11q | +62.2%+$5.8M |
| First Eagle Investment Management, LLC | $11.9M | 2,753,165 | 0.02% | 3q | +111.8%+$6.3M |
| Portolan Capital Management, LLC | $8.2M | 1,899,308 | 0.31% | 17q | -35.5%-$4.5M |
| VANGUARD CAPITAL MANAGEMENT LLC | $7.8M | 1,800,644 | 0.00% | 2q | +0.9%+$69.3K |
| Lionhunter Capital Management, LLC | $6.5M | 1,500,427 | 2.92% | new | FIRST |
| AQR CAPITAL MANAGEMENT LLC | $5.8M | 1,343,005 | 0.00% | 12q | +1496.3%+$5.4M |
| GEODE CAPITAL MANAGEMENT, LLC | $4.9M | 1,131,377 | 0.00% | 31q | +13.7%+$590.3K |
| AMERIPRISE FINANCIAL INC | $4.3M | 987,424 | 0.00% | 31q | -86.1%-$26.3M |
| MARSHALL WACE, LLP | $4.2M | 973,872 | 0.00% | 5q | +56.5%+$1.5M |
| STATE STREET CORP | $4.0M | 932,307 | 0.00% | 31q | +3.8%+$147.0K |
| Tikvah Management LLC | $2.5M | 571,555 | 0.75% | 31q | HELD |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $2.1M | 489,566 | 0.00% | 2q | -15.1%-$376.0K |
| JACOBS LEVY EQUITY MANAGEMENT, INC | $2.1M | 487,600 | 0.01% | new | NEW |
| MORGAN STANLEY | $1.9M | 447,688 | 0.00% | 35q | -26.3%-$691.9K |
| JANE STREET GROUP, LLC | $1.9M | 419,050 | 0.00% | 14q | +169.2%+$1.2M |
| TUDOR INVESTMENT CORP ET AL | $1.7M | 400,402 | 0.00% | 3q | +26.7%+$364.6K |
| DIMENSIONAL FUND ADVISORS LP | $1.7M | 397,833 | 0.00% | 23q | -10.2%-$195.7K |
| NORTHERN TRUST CORP | $1.5M | 337,227 | 0.00% | 31q | -3.6%-$53.7K |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $1.3M | 310,701 | 0.00% | 31q | -10.2%-$152.1K |
| Sixth Street Partners Management Company, L.P. | $1.3M | 310,701 | 0.00% | new | NEW |
| VANGUARD FIDUCIARY TRUST CO | $1.2M | 288,311 | 0.00% | 2q | +6.6%+$76.8K |
| UBS Group AG | $1.2M | 281,978 | 0.00% | 30q | -25.2%-$410.4K |
| Balyasny Asset Management L.P. | $1.1M | options only | 0.00% | new | OPTIONS |
| Nuveen, LLC | $1.0M | 232,592 | 0.00% | 6q | +223.8%+$694.4K |
| CITADEL ADVISORS LLC | $992.5K | 229,736 | 0.00% | 4q | +276.6%+$728.9K |
| XTX Topco Ltd | $985.1K | 228,035 | 0.01% | 7q | +104.2%+$502.7K |
| Point72 Asset Management, L.P. | $974.8K | 225,653 | 0.00% | 2q | +142.0%+$572.0K |
| GOLDMAN SACHS GROUP INC | $916.1K | 212,056 | 0.00% | 31q | -21.5%-$251.1K |
| FMR LLC | $909.9K | 210,634 | 0.00% | 31q | +14.9%+$117.8K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $822.6K | 168,620 | 0.00% | 23q | +232.5%+$575.2K |
| IRONWOOD INVESTMENT MANAGEMENT LLC | $736.8K | 170,555 | 0.25% | 5q | HELD |
| Invesco Ltd. | $695.0K | 160,887 | 0.00% | 29q | +38.4%+$193.0K |
| WELLS FARGO & COMPANY/MN | $644.4K | 149,158 | 0.00% | 31q | -42.2%-$470.4K |
| Susquehanna Portfolio Strategies, LLC | $642.0K | 148,618 | 0.01% | new | NEW |
| BNP PARIBAS FINANCIAL MARKETS | $591.3K | 136,876 | 0.00% | 31q | +1.8%+$10.7K |
| Bank of New York Mellon Corp | $569.8K | 131,900 | 0.00% | 31q | +4.4%+$23.9K |
| SCS Capital Management LLC | $518.6K | 120,035 | 0.00% | 6q | HELD |
| AMERICAN CENTURY COMPANIES INC | $434.0K | 100,463 | 0.00% | 14q | -1.3%-$5.8K |
| Quadrature Capital Ltd | $346.5K | 80,200 | 0.00% | new | NEW |
| Cerity Partners LLC | $337.3K | 78,083 | 0.00% | new | NEW |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | $294.7K | 68,226 | 0.01% | 4q | HELD |
| Clearstead Advisors, LLC | $269.0K | 62,261 | 0.00% | 4q | -49.8%-$267.2K |
| Jain Global LLC | $247.6K | 57,319 | 0.00% | new | NEW |
| ALGERT GLOBAL LLC | $238.5K | 55,217 | 0.00% | new | NEW |
| RHUMBLINE ADVISERS | $231.4K | 53,557 | 0.00% | 31q | +2.9%+$6.4K |
| PEDDOCK CAPITAL ADVISORS, LLC | $225.1K | 52,105 | 0.04% | 5q | HELD |
| MERCER GLOBAL ADVISORS INC /ADV | $222.3K | 51,462 | 0.00% | 2q | +373.2%+$175.3K |
| ALLIANCEBERNSTEIN L.P. | $199.9K | 56,780 | 0.00% | 30q | +27.7%+$43.3K |
| MILLENNIUM MANAGEMENT LLC | $175.7K | 40,662 | 0.00% | 21q | -94.1%-$2.8M |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC | $168.3K | 38,961 | 0.00% | new | NEW |
| CANADA PENSION PLAN INVESTMENT BOARD | $164.6K | 38,100 | 0.00% | new | NEW |
| Russell Investments Group, Ltd. | $163.0K | 37,722 | 0.00% | 14q | -94.1%-$2.6M |
| DEUTSCHE BANK AG\ | $158.4K | 36,678 | 0.00% | 34q | +3.4%+$5.3K |
| IEQ CAPITAL, LLC | $153.4K | 35,507 | 0.00% | new | NEW |
| BANK OF AMERICA CORP /DE/ | $126.5K | 29,286 | 0.00% | 31q | -40.9%-$87.5K |
| AXQ CAPITAL, LP | $110.6K | 25,599 | 0.01% | 3q | +5.1%+$5.4K |
| MetLife Investment Management, LLC | $107.1K | 24,801 | 0.00% | 29q | +9.9%+$9.6K |
| Aigen Investment Management, LP | $105.1K | 24,328 | 0.03% | new | NEW |
| OSAIC HOLDINGS, INC. | $104.4K | 24,176 | 0.00% | 23q | +6.0%+$5.9K |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC | $104.4K | 26,914 | 0.00% | new | NEW |
| IMC-Chicago, LLC | $99.9K | 10,214 | 0.00% | new | NEW |
| Dynamic Technology Lab Private Ltd | $90.0K | 20,816 | 0.02% | 2q | -73.3%-$246.7K |
| LPL Financial LLC | $86.8K | 20,099 | 0.00% | 3q | -21.7%-$24.1K |
| JPMORGAN CHASE & CO | $86.5K | 19,049 | 0.00% | 31q | +9.4%+$7.4K |
| CITIGROUP INC | $85.2K | 19,713 | 0.00% | 31q | +904.7%+$76.7K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $84.9K | 19,655 | 0.00% | 9q | HELD |
| Creative Planning | $80.1K | 18,538 | 0.00% | new | NEW |
| Vanguard Global Advisers, LLC | $80.0K | 18,525 | 0.00% | 2q | HELD |
| D. E. Shaw & Co., Inc. | $76.3K | 17,672 | 0.00% | new | NEW |
| NISA INVESTMENT ADVISORS, LLC | $75.0K | 17,356 | 0.00% | new | NEW |
| BARCLAYS PLC | $68.3K | 15,805 | 0.00% | 31q | -5.6%-$4.1K |
| HUB Investment Partners, LLC | $68.0K | 15,734 | 0.00% | 5q | +15.2%+$9.0K |
| Mariner, LLC | $66.8K | 15,471 | 0.00% | new | NEW |
| Engineers Gate Manager LP | $64.0K | 14,807 | 0.00% | 2q | -37.8%-$38.8K |
| Jump Financial, LLC | $63.5K | 14,700 | 0.00% | 6q | -48.3%-$59.3K |
| CAPTRUST FINANCIAL ADVISORS | $61.8K | 14,301 | 0.00% | new | NEW |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | $59.6K | 13,788 | 0.00% | 25q | +20.8%+$10.3K |
| HighTower Advisors, LLC | $59.0K | 13,660 | 0.00% | new | NEW |
| Vanguard Personalized Indexing Management, LLC | $57.2K | 13,239 | 0.00% | new | NEW |
| SIMPLEX TRADING, LLC | $57.1K | 7,127 | 0.00% | new | NEW |
| PharVision Advisers, LLC | $56.3K | 13,039 | 1.06% | new | NEW |
| Schonfeld Strategic Advisors LLC | $54.7K | 12,663 | 0.00% | 5q | -70.4%-$130.1K |
| Post Resch Tallon Group Inc. | $54.0K | 12,500 | 0.04% | 7q | HELD |
| Qube Research & Technologies Ltd | $51.8K | 11,987 | 0.00% | new | NEW |
| KESTRA PRIVATE WEALTH SERVICES, LLC | $48.8K | 11,294 | 0.00% | new | NEW |
| Police & Firemen's Retirement System of New Jersey | $43.5K | 10,062 | 0.00% | 7q | HELD |
| Cresset Asset Management, LLC | $43.2K | 10,000 | 0.00% | new | NEW |
| Arax Advisory Partners | $32.7K | 7,558 | 0.00% | new | NEW |
| Integrated Wealth Concepts LLC | $31.2K | 7,224 | 0.00% | new | NEW |
| PNC Financial Services Group, Inc. | $30.8K | 7,123 | 0.00% | 7q | +352.8%+$24.0K |
| NEW YORK STATE COMMON RETIREMENT FUND | $28.1K | 6,501 | 0.00% | 31q | HELD |
| Legal & General Group Plc | $17.3K | 3,993 | 0.00% | 31q | HELD |
| Ameritas Investment Partners, Inc. | $15.0K | 3,475 | 0.00% | 31q | HELD |
| Tower Research Capital LLC (TRC) | $13.4K | 3,108 | 0.00% | 25q | -22.0%-$3.8K |
| Sachetta, LLC | $13.0K | 3,000 | 0.01% | new | NEW |
| Allworth Financial LP | $9.3K | 2,143 | 0.00% | 4q | +1830.6%+$8.8K |
| GROUP ONE TRADING LLC | $8.4K | 1,933 | 0.00% | 2q | +121.7%+$4.6K |
| Pinnacle Wealth Planning Services, Inc. | $7.8K | 1,799 | 0.00% | 2q | HELD |
| ROYAL BANK OF CANADA | $7.0K | 1,475 | 0.00% | 31q | -99.4%-$1.1M |
Five percent filings
Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →
| Filed | Form | Filer | % of class |
|---|---|---|---|
| 2026-08-14 | 13G/A | Portolan Capital Management, LLCwith 1 co-filers | 4.0% |
| 2026-08-06 | 13G | First Eagle Investment Management, LLCwith 1 co-filers | 5.8% |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 131 | $127.7M | 29,259,467 | 40 | 39 | 29 | 1.1% |
| Q1 2026 | 122 | $140.6M | 39,861,506 | 16 | 51 | 31 | 0.1% |
| Q4 2025 | 127 | $222.4M | 34,905,341 | 18 | 39 | 43 | 0.2% |
| Q3 2025 | 122 | $195.2M | 35,932,863 | 19 | 44 | 33 | 0.1% |
| Q2 2025 | 130 | $232.5M | 34,956,864 | 22 | 42 | 39 | 0.0% |
| Q1 2025 | 140 | $223.6M | 34,348,035 | 33 | 48 | 34 | 0.1% |
| Q4 2024 | 143 | $371.0M | 34,883,419 | 19 | 53 | 40 | 0.5% |
| Q3 2024 | 137 | $429.9M | 33,251,688 | 19 | 39 | 49 | 0.2% |
| Q2 2024 | 144 | $426.9M | 32,343,409 | 17 | 49 | 45 | 0.2% |
| Q1 2024 | 151 | $716.0M | 30,289,500 | 16 | 53 | 48 | 0.4% |
| Q4 2023 | 155 | $816.1M | 29,660,771 | 21 | 49 | 46 | 0.7% |
| Q3 2023 | 143 | $804.6M | 29,333,459 | 26 | 50 | 43 | 1.1% |
| Q2 2023 | 126 | $652.1M | 28,494,676 | 27 | 34 | 40 | 1.7% |
| Q1 2023 | 114 | $306.5M | 27,243,499 | 21 | 32 | 31 | 0.1% |
| Q4 2022 | 101 | $351.8M | 24,119,123 | 13 | 40 | 30 | 5.7% |
| Q3 2022 | 140 | $337.7M | 30,037,064 | 35 | 49 | 35 | 2.0% |
| Q2 2022 | 132 | $519.2M | 32,056,961 | 18 | 43 | 43 | 0.0% |
| Q1 2022 | 142 | $955.5M | 32,061,068 | 11 | 58 | 46 | 2.1% |
| Q4 2021 | 152 | $1.3B | 31,670,683 | 19 | 58 | 45 | 0.3% |
| Q3 2021 | 152 | $1.6B | 30,803,181 | 21 | 54 | 46 | 1.1% |
| Q2 2021 | 160 | $1.8B | 29,991,763 | 29 | 75 | 42 | 0.6% |
| Q1 2021 | 162 | $1.7B | 28,303,322 | 47 | 67 | 35 | 0.2% |
| Q4 2020 | 142 | $1.1B | 23,415,600 | 40 | 39 | 41 | 0.1% |
| Q3 2020 | 111 | $773.1M | 22,804,176 | 25 | 46 | 21 | 0.0% |
| Q2 2020 | 90 | $565.2M | 20,476,590 | 19 | 37 | 20 | 0.0% |
| Q1 2020 | 83 | $368.8M | 19,755,337 | 10 | 29 | 26 | 0.0% |
| Q4 2019 | 83 | $479.7M | 20,090,677 | 6 | 37 | 20 | 0.0% |
| Q3 2019 | 87 | $423.6M | 19,053,050 | 14 | 50 | 10 | 0.0% |
| Q2 2019 | 89 | $525.5M | 15,447,836 | 27 | 39 | 13 | 0.0% |
| Q1 2019 | 70 | $303.8M | 11,580,913 | 16 | 22 | 16 | 0.0% |
| Q4 2018 | 59 | $214.4M | 11,711,586 | 1 | 1 | 2 | 0.0% |