Quanterix Corp (QTRX) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

46,060,000Shares Outstanding

32,901,951Shares held by institutions

$105,944,282Value of institutional holdings

71.43%Institutional ownership %

-1.70%Shares Changed QoQ

128No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Quanterix Corp (NASDAQ:QTRX) has 128 institutional investors with active 13F positions as of December 2025.

Collectively, these holders controlled 70.9% of Quanterix's outstanding shares in December 2025, down from 78.1% in September 2025.
Their total shares held in QTRX decreased -1.82% quarter over quarter, and separately, investors owning Quanterix decreased 16.34% from a year ago.
Among the 128 funds, 58 bought more Quanterix shares, 43 sold down, and 27 held their ground.
In total, institutional investors held 32.65Mn shares in Quanterix as of December 2025, down by 605.42K shares quarter on quarter, and down 2.86Mn shares year over year.
As of December 31, 2025, Ameriprise Financial Inc held the largest stake in Quanterix with 5.0Mn shares, accounting for 10.85% of total shares outstanding.
Top purchasers of QTRX stock for the quarter ending December 2025 included Ameriprise Financial Inc (752.56K), WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC (731.17K), First Eagle Investment Management, LLC (531.43K), Portolan Capital Management, LLC (265.7K), BlackRock, Inc. (262.93K).
Leading sellers of Quanterix shares for the quarter ending December 2025 were MILLENNIUM MANAGEMENT LLC (806.57K), EASTERLY INVESTMENT PARTNERS LLC (635.5K), Aberdeen Group plc (460.54K), MARSHALL WACE, LLP (453.54K), Jpmorgan Chase & Co (341.52K).
Per Business Quant, the top 10 investors in QTRX for the quarter ending December 2025 include Ameriprise Financial Inc (5.0Mn), Portolan Capital Management, LLC (4.53Mn), BlackRock, Inc. (3.38Mn), VANGUARD GROUP INC (2.68Mn), WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC (2.05Mn), Invenomic Capital Management LP (1.51Mn), GEODE CAPITAL MANAGEMENT, LLC (1.07Mn), State Street Corp (893.4K), Morgan Stanley (823.0K), Trium Capital LLP (817.45K).

128 Institutional Holders

32,901,951 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
Ameriprise Financial Inc	31 Dec, 2025	4,996,073	752,561	17.73%	$31,775,037.00
Portolan Capital Management, LLC	31 Dec, 2025	4,525,553	265,702	6.24%	$28,782,517.00
BlackRock, Inc.	31 Dec, 2025	3,375,910	262,930	8.45%	$21,470,788.00
VANGUARD GROUP INC	31 Dec, 2025	2,677,833	30,318	1.15%	$17,031,018.00
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC	31 Dec, 2025	2,046,449	731,169	55.59%	$13,015,416.00
Invenomic Capital Management LP	31 Dec, 2025	1,505,208	112,203	8.05%	$9,573,123.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	1,073,967	62,077	6.13%	$6,832,078.00
State Street Corp	31 Dec, 2025	893,401	73,867	9.01%	$5,682,030.00
Morgan Stanley	31 Dec, 2025	822,998	16,735	2.08%	$5,234,270.00
Trium Capital LLP	31 Dec, 2025	817,451	128,854	18.71%	$5,198,988.00
Williams Jones Wealth Management, LLC.	31 Dec, 2025	638,939	-47,525	-6.92%	$4,063,652.00
Empire Financial Management Company, LLC	31 Dec, 2025	617,830	165,400	36.56%	$3,929,398.00
EASTERLY INVESTMENT PARTNERS LLC	31 Dec, 2025	616,681	-635,503	-50.75%	$3,922,091.00
Tikvah Management LLC	31 Dec, 2025	571,619	0	0.00%	$3,635,497.00
First Eagle Investment Management, LLC	31 Dec, 2025	531,427	531,427	0.00%	$3,379,876.00
Goldman Sachs Group Inc	31 Dec, 2025	496,484	218,409	78.54%	$3,157,638.00
MILLENNIUM MANAGEMENT LLC	31 Dec, 2025	402,631	-806,568	-66.70%	$2,560,733.00
DIMENSIONAL FUND ADVISORS LP	31 Dec, 2025	389,466	-317,605	-44.92%	$2,476,911.00
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	31 Dec, 2025	362,740	31,494	9.51%	$2,307,023.00
Northern Trust Corp	31 Dec, 2025	345,564	-8,094	-2.29%	$2,197,787.00

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