Quanterix Corp - Common Stock, par value $0.001 (QTRX) Institutional Ownership

13F Institutional Holders and Ownership History from Q4 2017 to Q4 2025

Type / Class
Equity / Common Stock, par value $0.001
Symbol
QTRX on Nasdaq
Shares outstanding
46,382,370
Price per share
$6.36
All holders as of 30 Sep 2025
Q3 2025
Total 13F shares
35,667,289
Total reported value
$193,650,860
% of total 13F portfolios
0%
Share change
+910,153
Value change
+$2,747,084
Number of holders
126
Price from insider filings
$6.36
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Significant Owners of Quanterix Corp - Common Stock, par value $0.001 (QTRX) based on Schedule 13D/G filings

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
AMERIPRISE FINANCIAL INC 9.1% -15% $23,042,270 +$453,611 4,243,512 +2% Ameriprise Financial, Inc. 30 Sep 2025
Portolan Capital Management, LLC 9.4% +22% $16,496,644 +$3,042,822 3,633,622 +23% Portolan Capital Management, LLC 30 Jun 2025
BlackRock, Inc. 7.3% $13,195,046 2,843,760 BlackRock, Inc. 30 Jun 2025
VANGUARD GROUP INC 6.5% $12,274,800 2,525,679 The Vanguard Group 31 Mar 2025
Telegraph Hill Partners III, L.P. 5.4% $12,523,240 2,504,648 Telegraph Hill Partners III, L.P. 30 Sep 2025
Kent Lake PR LLC 4.5% -34% $9,695,280 -$2,577,919 2,089,500 -21% Kent Lake PR LLC 11 Jul 2025
ALLIANCEBERNSTEIN L.P. 0.1% -103% $179,723 -$11,677,730 36,980 -98% AllianceBernstein L.P. 31 Mar 2025

As of 30 Sep 2025, 126 institutional investors reported holding 35,667,289 shares of Quanterix Corp - Common Stock, par value $0.001 (QTRX). This represents 77% of the company’s total 46,382,370 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of Quanterix Corp - Common Stock, par value $0.001 (QTRX) together control 65% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.

Institution Ownership % Shares Held Share Change % Portfolio % Holdings Value
Portolan Capital Management, LLC 9.2% 4,259,851 +17% 1.3% $23,130,991
AMERIPRISE FINANCIAL INC 9.1% 4,243,512 +0.16% 0.01% $23,042,271
BlackRock, Inc. 6.7% 3,112,980 +6.4% 0% $16,903,481
VANGUARD GROUP INC 5.7% 2,647,515 +4.7% 0% $14,376,007
Invenomic Capital Management LP 3% 1,393,005 +22% 0.4% $7,564,017
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC 2.8% 1,315,280 +17% 0.02% $7,141,970
EASTERLY INVESTMENT PARTNERS LLC 2.7% 1,252,184 +16% 0.46% $6,799,359
MILLENNIUM MANAGEMENT LLC 2.6% 1,209,199 +9880% 0.01% $6,565,951
GEODE CAPITAL MANAGEMENT, LLC 2.2% 1,011,890 +14% 0% $5,495,644
Kent Lake PR LLC 2.2% 1,001,000 -56% 2.8% $5,435,430
Blue Water Life Science Advisors, LP 2.1% 957,747 0% 4.7% $5,200,566
STATE STREET CORP 1.8% 819,534 +7.1% 0% $4,450,070
MORGAN STANLEY 1.7% 806,263 +4.5% 0% $4,378,008
DIMENSIONAL FUND ADVISORS LP 1.5% 707,071 -12% 0% $3,838,842
Trium Capital LLP 1.5% 688,597 +17% 1.5% $3,739,082
Williams Jones Wealth Management, LLC. 1.5% 686,464 +1.5% 0.04% $3,727,500
MARSHALL WACE, LLP 1.3% 608,708 +37% 0% $3,305,284
Tikvah Management LLC 1.2% 571,619 0% 0.94% $3,103,891
Aberdeen Group plc 1.2% 564,581 +34% 0% $3,065,675
ENVESTNET ASSET MANAGEMENT INC 1.1% 515,861 +123% 0% $2,801,125
Empire Financial Management Company, LLC 0.98% 452,430 +265% 0.56% $2,456,694
Russell Investments Group, Ltd. 0.94% 434,060 +2.2% 0% $2,356,945
UBS Group AG 0.81% 373,600 -2.9% 0% $2,028,648
NORTHERN TRUST CORP 0.76% 353,658 +10% 0% $1,920,363
CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.71% 331,246 +11% 0% $1,798,666

Institutional Holders of Quanterix Corp - Common Stock, par value $0.001 (QTRX) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2025 Q4 1,066,293 $6,782,714 -$2,100,999 $6.36 12
2025 Q3 35,667,289 $193,650,860 +$2,747,084 $5.43 126
2025 Q2 34,710,785 $230,879,985 -$1,229,261 $6.65 136
2025 Q1 35,052,627 $228,183,415 -$13,775,822 $6.51 147
2024 Q4 34,969,625 $371,734,916 +$15,935,711 $10.63 149
2024 Q3 33,241,563 $430,806,787 +$1,541,490 $12.96 149
2024 Q2 32,401,995 $428,026,571 -$24,314,088 $13.21 153
2024 Q1 32,302,624 $761,048,535 +$17,265,020 $23.56 162
2023 Q4 14,301 $390,989 -$515,784 $27.34 1
2023 Q3 32,352,991 $878,061,654 -$2,928,542 $27.14 156
2023 Q2 32,494,570 $732,754,934 +$8,549,962 $22.55 135
2023 Q1 32,832,218 $370,011,648 +$10,834,772 $11.27 132
2022 Q4 30,744,630 $425,814,056 +$20,510,502 $13.85 123
2022 Q3 29,835,291 $328,729,692 -$16,657,316 $11.02 135
2022 Q2 31,973,150 $517,668,659 -$12,655,759 $16.19 122
2022 Q1 31,819,739 $928,465,025 +$30,895,130 $29.19 133
2021 Q4 31,614,381 $1,339,703,574 +$25,728,156 $42.40 147
2021 Q3 30,797,466 $1,533,599,090 +$41,669,450 $49.79 145
2021 Q2 29,945,972 $1,757,035,578 +$126,930,050 $58.66 155
2021 Q1 28,100,900 $1,643,830,478 +$286,701,296 $58.47 156
2020 Q4 22,878,664 $1,064,474,529 +$55,753,287 $46.50 136
2020 Q3 22,662,779 $764,773,296 +$79,014,089 $33.74 109
2020 Q2 20,321,558 $556,570,810 +$24,693,477 $27.39 87
2020 Q1 19,574,993 $359,631,891 -$8,124,808 $18.37 78
2019 Q4 19,756,472 $466,830,253 +$19,240,650 $23.63 81
2019 Q3 18,912,293 $415,310,210 +$116,284,822 $21.96 86
2019 Q2 15,280,994 $516,321,595 +$132,505,372 $33.79 86
2019 Q1 11,440,101 $295,494,269 +$3,218,082 $25.83 68
2018 Q4 11,614,179 $212,653,568 +$6,041,690 $18.31 58
2018 Q3 11,005,737 $235,738,384 +$4,250,116 $21.42 50
2018 Q2 10,860,088 $155,953,231 +$11,233,150 $14.36 44
2018 Q1 10,039,558 $170,571,569 +$10,141,758 $17.04 40
2017 Q4 9,515,854 $199,880,811 +$156,285,781 $21.47 31