Quanterix Corp (QTRX) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

41,056,652Shares Outstanding

1,039,399Shares held by institutions

$5,986,938Value of institutional holdings

79.20%Institutional ownership %

-0.99%Shares Changed QoQ

125No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

A total of 125 institutions have reported a stake in Quanterix Corp (NASDAQ:QTRX) as of December 2025, according to recent 13F filings with the SEC.

The collective stake of institutional investors in Quanterix moved to 79.2% in December 2025, a shift down from the 86.9% reported for September 2025.
On a quarter-over-quarter basis, institutional holdings shifted by -0.99%, with a year-over-year a decrease of 18.30% in the count of filers.
During the quarter, 56 institutions bought more Quanterix shares, 43 sold shares, and 26 of the 125 total investors held their position steady.
This class of investors decreased its holdings in Quanterix to 32.52Mn shares for the 13F-cycle ending December 2025, down by 325.94K shares quarter on quarter, and down 2.57Mn shares year over year.
As of December 31, 2025, AMERIPRISE FINANCIAL INC held Quanterix's largest shareholding position with over 5.00Mn shares, representing 12.17% of total outstanding shares.
Among the most significant buyers of Quanterix during December 2025 were AMERIPRISE FINANCIAL INC (752.56K), WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC (731.17K), First Eagle Investment Management, LLC (531.43K), Portolan Capital Management, LLC (265.70K), BlackRock, Inc. (262.93K).
Leading sellers of Quanterix stock in December 2025 included MILLENNIUM MANAGEMENT LLC (806.57K), EASTERLY INVESTMENT PARTNERS LLC (635.50K), Aberdeen Group plc (460.54K), MARSHALL WACE, LLP (453.54K), DIMENSIONAL FUND ADVISORS LP (317.61K).
The top 10 institutional holders of Quanterix for the quarter ending December 2025 included AMERIPRISE FINANCIAL INC (5.00Mn), 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 (893.40K), MORGAN STANLEY (823.00K), Trium Capital LLP (817.45K).

125 Institutional Holders

1,039,399 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
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
UBS Group AG	31 Dec, 2025	311,499	-62,101	-16.62%	$1,981,134.00

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