Security Snapshot

Quanterix Corp - Common Stock (QTRX) Institutional Ownership

CUSIP: 74766Q101

13F Institutional Holders and Ownership History from Q4 2017 to Q1 2026

Latest Period

Q4 2025

Institutions Reporting

131

Shares (Excl. Options)

35,108,633

Price

$6.36

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Type / Class
Equity / Common Stock
Symbol
QTRX on Nasdaq
Shares outstanding
46,692,271
Price per share
$3.52
All holders as of 31 Dec 2025
Q4 2025
Total 13F shares
35,108,633
Total reported value
$223,245,338
% of total 13F portfolios
0%
Share change
+738,766
Value change
+$4,778,157
Number of holders
131
Price from insider filings
$3.52
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Quick Takeaways

  • QTRX - Quanterix Corp - Common Stock is tracked under CUSIP 74766Q101.
  • 131 institutions reported positions in Q4 2025.
  • 6 significant owners is listed from Schedule 13D/13G reporting.

What Changed

  • Holder count moved from 131 to 10 between Q4 2025 and Q1 2026.
  • Reported value moved from $223,245,338 to $3,740,634.

Why This Matters

  • You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
  • 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.

Source Evidence

Source: SEC Form 13F

Latest holder context comes from 131 institutions filings for Q4 2025.

Open SEC Evidence

Investment Quick Answers

What is CUSIP 74766Q101?
CUSIP 74766Q101 identifies QTRX - Quanterix Corp - Common Stock in SEC 13F datasets.

Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.

Significant Owners of Quanterix Corp - Common Stock (QTRX) based on Schedule 13D/G filings

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
AMERIPRISE FINANCIAL INC 11% +18% $33,123,964 +$4,989,479 4,996,073 +18% Ameriprise Financial, Inc. 31 Dec 2025
Portolan Capital Management, LLC 9.4% +22% $21,402,034 +$3,947,625 3,633,622 +23% Portolan Capital Management, LLC 30 Jun 2025
BlackRock, Inc. 7.3% $18,911,004 2,843,760 BlackRock, Inc. 30 Jun 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% $13,894,548 -$3,694,480 2,089,500 -21% Kent Lake PR LLC 11 Jul 2025
ALLIANCEBERNSTEIN L.P. 0.1% -103% $207,088 -$13,455,820 36,980 -98% AllianceBernstein L.P. 31 Mar 2025

As of 31 Dec 2025, 131 institutional investors reported holding 35,108,633 shares of Quanterix Corp - Common Stock (QTRX). This represents 75% of the company’s total 46,692,271 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of Quanterix Corp - Common Stock (QTRX) together control 66% 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
AMERIPRISE FINANCIAL INC 11% 4,996,073 +18% 0.01% $31,775,037
Portolan Capital Management, LLC 9.7% 4,525,553 +6.2% 1.5% $28,782,517
BlackRock, Inc. 7.2% 3,375,910 +8.4% 0% $21,470,788
VANGUARD GROUP INC 5.7% 2,677,833 +1.1% 0% $17,031,018
Blue Water Life Science Advisors, LP 4.5% 2,092,147 +118% 8.4% $13,306,055
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC 4.4% 2,046,449 +56% 0.04% $13,015,416
Invenomic Capital Management LP 3.2% 1,505,208 +8.1% 0.46% $9,573,123
GEODE CAPITAL MANAGEMENT, LLC 2.3% 1,073,967 +6.1% 0% $6,832,078
STATE STREET CORP 1.9% 893,401 +9% 0% $5,682,030
MORGAN STANLEY 1.8% 822,998 +2.1% 0% $5,234,270
Trium Capital LLP 1.8% 817,451 +19% 4% $5,198,988
Williams Jones Wealth Management, LLC. 1.4% 638,939 -6.9% 0.05% $4,063,652
Empire Financial Management Company, LLC 1.3% 617,830 +37% 0.85% $3,929,398
EASTERLY INVESTMENT PARTNERS LLC 1.3% 616,681 -51% 0.24% $3,922,091
Tikvah Management LLC 1.2% 571,619 0% 0.99% $3,635,497
First Eagle Investment Management, LLC 1.1% 531,427 0.01% $3,379,876
MILLENNIUM MANAGEMENT LLC 0.86% 402,631 -67% 0% $2,560,733
DIMENSIONAL FUND ADVISORS LP 0.83% 389,466 -45% 0% $2,476,911
CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.78% 362,740 +9.5% 0% $2,307,023
NORTHERN TRUST CORP 0.74% 345,564 -2.3% 0% $2,197,787
Parkman Healthcare Partners LLC 0.7% 328,956 +30% 0.2% $2,092,160
UBS Group AG 0.67% 311,499 -17% 0% $1,981,134
TWO SIGMA INVESTMENTS, LP 0.55% 258,858 +3.5% 0% $1,646,337
Russell Investments Group, Ltd. 0.55% 256,140 -41% 0% $1,629,050
ENVESTNET ASSET MANAGEMENT INC 0.54% 252,211 -51% 0% $1,604,062

Institutional Holders of Quanterix Corp - Common Stock (QTRX) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2026 Q1 1,062,410 $3,740,634 +$601,415 $3.52 10
2025 Q4 35,108,633 $223,245,338 +$4,778,157 $6.36 131
2025 Q3 35,667,301 $193,650,925 +$2,746,608 $5.43 127
2025 Q2 34,706,219 $230,800,985 -$1,229,254 $6.65 135
2025 Q1 35,052,627 $228,183,737 -$13,775,858 $6.51 147
2024 Q4 34,986,611 $371,914,799 +$16,121,868 $10.63 149
2024 Q3 33,241,563 $430,807,040 +$1,578,585 $12.96 148
2024 Q2 32,444,291 $428,581,553 -$24,339,668 $13.21 154
2024 Q1 32,304,424 $761,091,215 +$14,149,198 $23.56 162
2023 Q4 31,606,543 $864,126,575 -$24,356,227 $27.34 171
2023 Q3 32,368,786 $878,491,034 -$2,866,513 $27.14 157
2023 Q2 32,508,081 $733,059,314 +$7,550,645 $22.55 136
2023 Q1 32,857,738 $370,299,549 +$10,875,738 $11.27 134
2022 Q4 31,640,627 $438,223,400 +$20,742,320 $13.85 128
2022 Q3 29,860,035 $329,002,411 -$53,914,115 $11.02 137
2022 Q2 32,056,174 $519,013,659 -$13,420,976 $16.19 126
2022 Q1 32,058,199 $935,417,025 +$5,961,086 $29.19 137
2021 Q4 31,614,679 $1,339,716,574 +$25,726,485 $42.40 148
2021 Q3 30,798,959 $1,533,673,090 +$40,652,565 $49.79 148
2021 Q2 29,988,923 $1,759,555,578 +$118,333,332 $58.66 156
2021 Q1 28,296,161 $1,655,248,478 +$302,307,999 $58.47 158
2020 Q4 23,236,863 $1,081,130,529 +$57,531,970 $46.50 139
2020 Q3 22,662,885 $764,777,296 +$79,015,895 $33.74 110
2020 Q2 20,335,622 $556,955,810 +$25,091,575 $27.39 88
2020 Q1 19,579,910 $359,723,891 -$8,112,263 $18.37 80
2019 Q4 19,760,825 $466,933,253 +$19,216,424 $23.63 82
2019 Q3 18,912,293 $415,310,210 +$116,253,289 $21.96 86
2019 Q2 13,456,355 $454,666,714 +$139,461,201 $33.79 86
2019 Q1 9,409,606 $243,046,269 +$4,038,727 $25.83 67
2018 Q4 11,619,932 $212,758,568 +$6,126,624 $18.31 59
2018 Q3 8,992,253 $192,610,384 +$4,336,602 $21.42 50
2018 Q2 8,830,428 $126,807,231 +$11,234,140 $14.36 45
2018 Q1 10,039,558 $170,571,569 +$6,281,533 $17.04 40
2017 Q4 9,515,854 $203,688,000 +$203,688,000 $21.47 31