Ranked by reported Q2 2026 13F market value
Share of total reported institutional value in QTRX held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 3.6M | $15.7M | +10.9% | 7.717% | 0.00% |
| 2 | Blue Water Life Science Advisors, LP | 3.5M | $15.0M | +62.2% | 7.375% | 9.45% |
| 3 | First Eagle Investment Management, LLC | 2.8M | $11.9M | +111.8% | 5.845% | 0.01% |
| 4 | Portolan Capital Management, LLC | 1.9M | $8.2M | -35.5% | 4.032% | 0.31% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 1.8M | $7.8M | +0.9% | 3.823% | 0.00% |
| 6 | Lionhunter Capital Management, LLC | 1.5M | $6.5M | — | 3.185% | 2.92% |
| 7 | AQR CAPITAL MANAGEMENT LLC | 1.3M | $5.8M | +1496.3% | 2.851% | 0.00% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 1.1M | $4.9M | +13.7% | 2.402% | 0.00% |
| 9 | AMERIPRISE FINANCIAL INC | 987K | $4.3M | -72.1% | 2.096% | 0.00% |
| 10 | MARSHALL WACE, LLP | 974K | $4.2M | +56.5% | 2.067% | 0.00% |
| 11 | STATE STREET CORP | 932K | $4.0M | +3.8% | 1.979% | 0.00% |
| 12 | Tikvah Management LLC | 572K | $2.5M | -0.0% | 1.213% | 0.75% |
| 13 | VANGUARD PORTFOLIO MANAGEMENT LLC | 490K | $2.1M | -15.1% | 1.039% | 0.00% |
| 14 | JACOBS LEVY EQUITY MANAGEMENT, INC | 488K | $2.1M | — | 1.035% | 0.01% |
| 15 | MORGAN STANLEY | 448K | $1.9M | -26.4% | 0.950% | 0.00% |
| 16 | JANE STREET GROUP, LLC | 433K | $1.9M | +178.4% | 0.920% | 0.00% |
| 17 | TUDOR INVESTMENT CORP ET AL | 400K | $1.7M | +26.7% | 0.850% | 0.00% |
| 18 | DIMENSIONAL FUND ADVISORS LP | 398K | $1.7M | -10.2% | 0.844% | 0.00% |
| 19 | NORTHERN TRUST CORP | 337K | $1.5M | -3.6% | 0.716% | 0.00% |
| 20 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 311K | $1.3M | -10.2% | 0.660% | 0.00% |
| 21 | VANGUARD FIDUCIARY TRUST CO | 288K | $1.2M | +6.6% | 0.612% | 0.00% |
| 22 | UBS Group AG | 282K | $1.2M | -25.2% | 0.599% | 0.00% |
| 23 | BALYASNY ASSET MANAGEMENT L.P. | 260K | $1.1M | — | 0.552% | 0.00% |
| 24 | Nuveen, LLC | 233K | $1.0M | +223.7% | 0.494% | 0.00% |
| 25 | CITADEL ADVISORS LLC | 230K | $992K | +162.3% | 0.488% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in QTRX — a direct measure of their conviction.
Filings activity in QTRX during Q2 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 133 | +3.9% | 63.09% | 14.49 pp | $126M | 1.2% |
| Q1 2026 | 128 | 3.8% | 77.58% | +2.35 pp | $128M | 43% |
| Q4 2025 | 133 | +4.7% | 75.23% | 1.28 pp | $222M | +15% |
| Q3 2025 | 127 | 8.6% | 76.51% | 11.54 pp | $193M | 15% |
| Q2 2025 | 139 | 7.9% | 88.05% | 1.90 pp | $226M | +2.6% |
| Q1 2025 | 151 | 1.3% | 89.95% | +0.04 pp | $221M | 39% |
| Q4 2024 | 153 | +3.4% | 89.91% | +3.78 pp | $362M | 14% |
| Q3 2024 | 148 | — | 86.13% | — | $419M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying QTRX stock.
Based on Q2 2026 13F filings, institutional ownership of Quanterix Corporation stands at 63.1%, held across 133 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of QTRX, with approximately 3,635,411 shares worth $0.02B as of Q2 2026.
Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of QTRX, including JANE STREET GROUP, LLC, CITADEL ADVISORS LLC.
Our composite Smart Money Score for QTRX is 46 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
36 institutions opened new positions in QTRX during Q2 2026, while 30 fully exited. 71 added to existing positions and 24 trimmed.
QTRX institutional ownership fell by 14.49 percentage points quarter-over-quarter, with a net change of +5 holders.
The top 10 institutions account for 66.8% of all reported 13F value in QTRX, and the top 25 account for 87.7%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Quanterix Corporation (QTRX) Institutional Ownership