QTRX Quanterix Corporation

NASDAQ
$2.50

Quanterix Corporation (QTRX) Institutional Ownership

What the institutions did with QTRX last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.

Managers compared
162
filed both this quarter and last
Managers holding
131
+4 on the quarter
Buyers
79
35 opened new
Sellers
61
31 sold out entirely
Buyer share
56.4%
of managers who traded it
Breadth
+12.9
net buyers, as a share of those trading

Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.

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Ownership map

Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.

Cut Unchanged Added Color saturates at ±50%.

Largest holders

Manager Shares % of reported
First Eagle Investment Management, LLC 5.5M 17.1%
BlackRock, Inc. 3.6M 11.3%
Blue Water Life Science Advisors, LP 3.5M 10.8%
Portolan Capital Management, LLC 1.9M 5.9%
VANGUARD CAPITAL MANAGEMENT LLC 1.8M 5.6%
Lionhunter Capital Management, LLC 1.5M 4.7%
AQR CAPITAL MANAGEMENT LLC 1.3M 4.2%
GEODE CAPITAL MANAGEMENT, LLC 1.1M 3.5%
AMERIPRISE FINANCIAL INC 987.4K 3.1%
MARSHALL WACE, LLP 973.9K 3.0%
STATE STREET CORP 932.3K 2.9%
Tikvah Management LLC 571.6K 1.8%
VANGUARD PORTFOLIO MANAGEMENT LLC 489.6K 1.5%
JACOBS LEVY EQUITY MANAGEMENT, INC 487.6K 1.5%
MORGAN STANLEY 447.7K 1.4%
JANE STREET GROUP, LLC 419.1K 1.3%
GSA CAPITAL PARTNERS LLP 410.3K 1.3%
TUDOR INVESTMENT CORP ET AL 400.4K 1.2%
DIMENSIONAL FUND ADVISORS LP 397.8K 1.2%
NORTHERN TRUST CORP 337.2K 1.0%
CHARLES SCHWAB INVESTMENT MANAGEMENT INC 310.7K 1.0%
VANGUARD FIDUCIARY TRUST CO 288.3K 0.9%
UBS Group AG 282.0K 0.9%
Nuveen, LLC 232.6K 0.7%
CITADEL ADVISORS LLC 229.7K 0.7%

Largest changes

Manager Action Previous Current Change
First Eagle Investment Management, LLC Increased 1.3M 5.5M +4.2M
AMERIPRISE FINANCIAL INC Reduced 3.5M 987.4K -2.6M
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC Sold Out 2.1M 0 -2.1M
Invenomic Capital Management LP Sold Out 1.9M 0 -1.9M
LEVIN CAPITAL STRATEGIES, L.P. Sold Out 1.5M 0 -1.5M
Blue Water Life Science Advisors, LP Increased 2.1M 3.5M +1.3M
AQR CAPITAL MANAGEMENT LLC Increased 84.1K 1.3M +1.3M
Portolan Capital Management, LLC Reduced 2.9M 1.9M -1.0M
Trium Capital LLP Sold Out 994.2K 0 -994.2K
Empire Financial Management Company, LLC Sold Out 736.1K 0 -736.1K
ENVESTNET ASSET MANAGEMENT INC Sold Out 682.7K 0 -682.7K
MILLENNIUM MANAGEMENT LLC Reduced 689.2K 40.7K -648.5K
Williams Jones Wealth Management, LLC. Sold Out 613.4K 0 -613.4K
Russell Investments Group, Ltd. Reduced 642.0K 37.7K -604.3K
Topline Capital Management, LLC Sold Out 563.1K 0 -563.1K
Pier Capital, LLC Sold Out 492.4K 0 -492.4K
JACOBS LEVY EQUITY MANAGEMENT, INC New 0 487.6K +487.6K
BlackRock, Inc. Increased 3.3M 3.6M +357.8K
MARSHALL WACE, LLP Increased 622.4K 973.9K +351.5K
Parkman Healthcare Partners LLC Sold Out 341.5K 0 -341.5K
GSA CAPITAL PARTNERS LLP Increased 95.5K 410.3K +314.7K
JANE STREET GROUP, LLC Increased 155.7K 419.1K +263.4K
ROYAL BANK OF CANADA Reduced 232.1K 1.5K -230.6K
CITADEL ADVISORS LLC Increased 61.0K 229.7K +168.7K
Nuveen, LLC Increased 71.8K 232.6K +160.8K
MORGAN STANLEY Reduced 607.9K 447.7K -160.2K
Susquehanna Portfolio Strategies, LLC New 0 148.6K +148.6K
GEODE CAPITAL MANAGEMENT, LLC Increased 994.8K 1.1M +136.6K
RENAISSANCE TECHNOLOGIES LLC Sold Out 136.2K 0 -136.2K
Point72 Asset Management, L.P. Increased 93.3K 225.7K +132.4K
SUSQUEHANNA INTERNATIONAL GROUP, LLP Increased 50.7K 168.6K +117.9K
XTX Topco Ltd Increased 111.7K 228.0K +116.4K
UBS Group AG Reduced 377.0K 282.0K -95.0K
Brevan Howard Capital Management LP Sold Out 87.4K 0 -87.4K
VANGUARD PORTFOLIO MANAGEMENT LLC Reduced 576.6K 489.6K -87.0K
TUDOR INVESTMENT CORP ET AL Increased 316.0K 400.4K +84.4K
STATE OF WISCONSIN INVESTMENT BOARD Sold Out 84.1K 0 -84.1K
Quadrature Capital Ltd New 0 80.2K +80.2K
Cerity Partners LLC New 0 78.1K +78.1K
HRT FINANCIAL LP Sold Out 71.7K 0 -71.7K
Clearstead Advisors, LLC Reduced 124.1K 62.3K -61.9K
GOLDMAN SACHS GROUP INC Reduced 270.2K 212.1K -58.1K
Jain Global LLC New 0 57.3K +57.3K
Dynamic Technology Lab Private Ltd Reduced 77.9K 20.8K -57.1K
ALGERT GLOBAL LLC New 0 55.2K +55.2K
PDT Partners, LLC Sold Out 47.7K 0 -47.7K
Quantinno Capital Management LP Sold Out 47.6K 0 -47.6K
DIMENSIONAL FUND ADVISORS LP Reduced 443.1K 397.8K -45.3K
Invesco Ltd. Increased 116.2K 160.9K +44.7K
FOX RUN MANAGEMENT, L.L.C. Sold Out 39.6K 0 -39.6K
SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC New 0 39.0K +39.0K
CANADA PENSION PLAN INVESTMENT BOARD New 0 38.1K +38.1K
IEQ CAPITAL, LLC New 0 35.5K +35.5K
CHARLES SCHWAB INVESTMENT MANAGEMENT INC Reduced 345.9K 310.7K -35.2K
TWO SIGMA INVESTMENTS, LP Sold Out 35.2K 0 -35.2K
STATE STREET CORP Increased 898.3K 932.3K +34.0K
Schonfeld Strategic Advisors LLC Reduced 42.8K 12.7K -30.1K
FMR LLC Increased 183.4K 210.6K +27.3K
PRICE T ROWE ASSOCIATES INC /MD/ Increased 68.4K 95.6K +27.3K
WEALTH ENHANCEMENT ADVISORY SERVICES, LLC New 0 26.9K +26.9K

13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.