QUANTERIX CORP

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QTRX·74766Q101·US·Common Stock·Healthcare - Medical Devices-Activist

QTRX (QUANTERIX CORP) is held by 80 institutional investors as of Q1 2026. Largest holders: AMERIPRISE FINANCIAL INC ($12.5M), BlackRock, Inc. ($11.5M), WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC ($7.3M). Net institutional sentiment: Mixed.

80

Holders

(6 Elite)

$82.5M

Total Value

54% (81)

Consensus

44 buying - 37 selling

13F: Mar 31, 2026Insider & Congress: Updated regularly

Smart Money Verdict

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Institutional (13F)30

Insider (Form 4)52

Activist (13D/13G)74

Congressional (STOCK Act)74

Holder Quality

32

★★★★★

Elite

78

★★★★

Strong

40

★★★

Solid

78

★★

Below

47

★

Weak

Held by 80 funds

6 elite

Who's Trading

Source dates: Price Aug 13, 2026 · Insiders Jun 12, 2026 · Activists Aug 6, 2026 · Congress none

ActivistFirst Eagle Investment Management, LLC5.8%Aug 6, 2026

ActivistPOPortolan Capital Management, LLC6.3%May 15, 2026

ActivistAmeriprise Financial, Inc.7.5%May 15, 2026

InsiderMBMeadows BenjaminBuy $10KMay 12, 2026

InsiderMFMiller Michael FrancisTax 39 shApr 30, 2026

InsiderMFMiller Michael FrancisExercise 130 shApr 30, 2026

ActivistThe Vanguard Group0.0%Mar 27, 2026

ActivistTHTelegraph Hill Partners III, L.P.5.4%Nov 19, 2025

InsiderSVSriram VandanaBuy $20KSep 12, 2025

ActivistBlackRock, Inc.7.3%Jul 17, 2025

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Top Holders

Top Holders (80)History

AllNewIncreasedHeldDecreasedExited

Fund	Action	Shares	Value	Weight	Est. P&L	Conviction
AMERIPRISE FINANCIAL INC	Decreased	3.5M(-29.1%)	$12.5M	0.0%	-72.77%	0
BlackRock, Inc.	Decreased	3.3M(-2.9%)	$11.5M	0.0%	-72.04%	0
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC	Increased	2.1M(+1.8%)	$7.3M	0.0%	-66.60%	28
VAVANGUARD CAPITAL MANAGEMENT LLC	New	1.8M	$6.3M	0.0%	-51.28%	38
First Eagle Investment Management, LLC	Increased	1.3M(+144.6%)	$4.6M	0.0%	-52.79%	43
GEODE CAPITAL MANAGEMENT, LLC	Decreased	994,764(-7.4%)	$3.5M	0.0%	-89.25%	0
STATE STREET CORP	Increased	898,277(+0.6%)	$3.2M	0.0%	-87.68%	26
MILLENNIUM MANAGEMENT LLC	Increased	689,167(+71.2%)	$2.4M	0.0%	-48.87%	39
ENVESTNET ASSET MANAGEMENT INC	Increased	682,711(+170.7%)	$2.4M	0.0%	-56.56%	42
Russell Investments Group, Ltd.	Increased	641,981(+150.6%)	$2.3M	0.0%	-63.04%	42
MWMARSHALL WACE, LLP	Increased	622,380(+301.1%)	$2.2M	0.0%	-52.09%	42
Williams Jones Wealth Management, LLC.	Decreased	613,439(-4.0%)	$2.2M	0.0%	-75.01%	0
MORGAN STANLEY	Decreased	607,856(-26.1%)	$2.1M	0.0%	-66.31%	0
VPVANGUARD PORTFOLIO MANAGEMENT LLC	New	576,600	$2M	0.0%	-51.28%	36
DIMENSIONAL FUND ADVISORS LP	Increased	443,118(+13.8%)	$1.6M	0.0%	-82.69%	29
UBS Group AG	Increased	376,982(+21.0%)	$1.3M	0.0%	-70.37%	30
NORTHERN TRUST CORP	Increased	349,658(+1.2%)	$1.2M	0.0%	-89.28%	26
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	Decreased	345,913(-4.6%)	$1.2M	0.0%	-88.99%	0
TUDOR INVESTMENT CORP ET AL	Increased	316,001(+86.2%)	$1.1M	0.0%	-53.25%	39
VFVANGUARD FIDUCIARY TRUST CO	New	270,529	$952,262	0.0%	-51.28%	35

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High Conviction Moves-Smart Money Convergence-Fund Consensus-Double-Down Detection

Data sourced from four public-disclosure sources: SEC 13F, Form 4, 13D/13G, and House/Senate STOCK Act disclosures. Not financial advice. Full disclaimer