Company · Ownership research

Quanterix Corp QTRX

CIK 0001503274 · CUSIP 74766Q101

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 74766Q101 (QTRX), not CUSIP 74766Q951 (QTRX), CUSIP 74766Q901 (QTRX), and does not merge CUSIPs.

This page lists the top 20 of 128 rows by value; the complete set is available through the API.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	AMERIPRISE FINANCIAL INC CIK 820027 · Amended · View history	$12.47M 3,542,374 shares	0.00%	-1.45M(-29.10%)Reduced	SEC filing ↗ Jul 17, 2026	▾
02	BlackRock, Inc. CIK 2012383 · View history	$11.54M 3,277,595 shares	0.00%	-98.31K(-2.90%)Reduced	SEC filing ↗ May 13, 2026	▾
03	Portolan Capital Management, LLC CIK 1350290 · View history	$10.37M 2,945,823 shares	0.55%	-1.58M(-34.90%)Reduced	SEC filing ↗ May 15, 2026	▾
04	Blue Water Life Science Advisors, LP CIK 1789778 · View history	$7.54M 2,142,147 shares	6.05%	+50.00K(+2.40%)Added	SEC filing ↗ May 14, 2026	▾
05	WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC CIK 1644956 · View history	$7.33M 2,083,699 shares	0.02%	+37.25K(+1.80%)Added	SEC filing ↗ May 8, 2026	▾
06	Invenomic Capital Management LP CIK 1769456 · View history	$6.80M 1,932,386 shares	0.31%	+427.18K(+28.40%)Added	SEC filing ↗ May 15, 2026	▾
07	VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · Amended · View history	$6.28M 1,784,613 shares	0.00%	—	SEC filing ↗ May 15, 2026	▾
08	LEVIN CAPITAL STRATEGIES, L.P. CIK 1354821 · View history	$5.15M 1,464,052 shares	0.39%	+1.46MNew	SEC filing ↗ May 13, 2026	▾
09	First Eagle Investment Management, LLC CIK 1325447 · Amended · View history	$4.58M 1,300,087 shares	0.01%	+768.66K(+144.60%)Added	SEC filing ↗ May 14, 2026	▾
10	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$3.50M 994,764 shares	0.00%	-79.20K(-7.40%)Reduced	SEC filing ↗ May 15, 2026	▾
11	Trium Capital LLP CIK 1963860 · View history	$3.50M 994,217 shares	2.54%	+176.77K(+21.60%)Added	SEC filing ↗ Apr 16, 2026	▾
12	STATE STREET CORP CIK 93751 · View history	$3.16M 898,277 shares	0.00%	+4.88K(+0.50%)Added	SEC filing ↗ May 15, 2026	▾
13	Empire Financial Management Company, LLC CIK 1971875 · View history	$2.59M 736,068 shares	0.59%	+118.24K(+19.10%)Added	SEC filing ↗ May 18, 2026	▾
14	MILLENNIUM MANAGEMENT LLC CIK 1273087 · View history	$2.43M 689,167 shares	0.00%	+286.54K(+71.20%)Added	SEC filing ↗ May 15, 2026	▾
15	ENVESTNET ASSET MANAGEMENT INC CIK 1407543 · View history	$2.40M 682,711 shares	0.00%	+430.50K(+170.70%)Added	SEC filing ↗ May 4, 2026	▾
16	Russell Investments Group, Ltd. CIK 1692234 · View history	$2.26M 641,981 shares	0.00%	+385.84K(+150.60%)Added	SEC filing ↗ May 8, 2026	▾
17	MARSHALL WACE, LLP CIK 1318757 · View history	$2.19M 622,380 shares	0.00%	+467.21K(+301.10%)Added	SEC filing ↗ May 15, 2026	▾
18	Williams Jones Wealth Management, LLC. CIK 1788587 · View history	$2.16M 613,439 shares	0.03%	-25.50K(-4.00%)Reduced	SEC filing ↗ May 5, 2026	▾
19	MORGAN STANLEY CIK 895421 · View history	$2.14M 607,856 shares	0.00%	-215.14K(-26.10%)Reduced	SEC filing ↗ May 15, 2026	▾
20	VANGUARD PORTFOLIO MANAGEMENT LLC CIK 2100121 · Amended · View history	$2.03M 576,600 shares	0.00%	—	SEC filing ↗ May 8, 2026	▾

Showing 20 / 128 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

128

Cancelled or null records excluded

Disclosed shares

36,445,992

Not deduplicated across managers

Disclosed value

$128.41M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

Quanterix Corp · Q1 2026

Explore all 128 reporting institutions.

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.