Security Snapshot

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

CUSIP: 74766Q101

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

Latest Period

Q1 2026

Institutions Reporting

120

Shares (Excl. Options)

35,610,693

Price

$3.52

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Type / Class
Equity / Common Stock, $0.001 par value per share
Symbol
QTRX on Nasdaq
Shares outstanding
47,133,168
Price per share
$3.28
All holders as of 31 Mar 2026
Q1 2026
Total 13F shares
35,610,693
Total reported value
$125,346,171
% of total 13F portfolios
0%
Share change
+1,335,374
Value change
+$1,551,812
Number of holders
120
Price from insider filings
$3.28
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Quick Takeaways

  • QTRX - Quanterix Corp - Common Stock, $0.001 par value per share is tracked under CUSIP 74766Q101.
  • 120 institutions reported positions in Q1 2026.
  • 6 significant owners is listed from Schedule 13D/13G reporting.

What Changed

  • Holder count moved from 131 to 120 between Q4 2025 and Q1 2026.
  • Reported value moved from $223,245,338 to $125,346,171.

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 120 institutions filings for Q1 2026.

Open SEC Evidence

Investment Quick Answers

What is CUSIP 74766Q101?
CUSIP 74766Q101 identifies QTRX - Quanterix Corp - Common Stock, $0.001 par value per share in SEC 13F datasets.

Where can I see the latest institutional holders?
Review the Q1 2026 holders report and the ownership history table below.

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

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
Portolan Capital Management, LLC 6.2% -35% $9,897,965 -$2,311,005 2,945,823 -19% Portolan Capital Management, LLC 31 Mar 2026
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
AMERIPRISE FINANCIAL INC 2.1% -78% $3,327,153 -$13,459,653 990,224 -80% Ameriprise Financial, Inc. 30 Apr 2026
ALLIANCEBERNSTEIN L.P. 0.1% -103% $207,088 -$13,455,820 36,980 -98% AllianceBernstein L.P. 31 Mar 2025

As of 31 Mar 2026, 120 institutional investors reported holding 35,610,693 shares of Quanterix Corp - Common Stock, $0.001 par value per share (QTRX). This represents 76% of the company’s total 47,133,168 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of Quanterix Corp - Common Stock, $0.001 par value per share (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
AMERIPRISE FINANCIAL INC 7.5% 3,542,374 -29% 0% $12,469,155
BlackRock, Inc. 7% 3,277,595 -2.9% 0% $11,537,134
Portolan Capital Management, LLC 6.2% 2,945,823 -35% 0.55% $10,369,297
Blue Water Life Science Advisors, LP 4.5% 2,142,147 +2.4% 6% $7,540,357
WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC 4.4% 2,083,699 +1.8% 0.02% $7,334,620
Invenomic Capital Management LP 4.1% 1,932,386 +28% 0.31% $6,801,999
VANGUARD CAPITAL MANAGEMENT LLC 3.8% 1,784,613 0% 0% $6,281,838
LEVIN CAPITAL STRATEGIES, L.P. 3.1% 1,464,052 0.39% $5,153,463
First Eagle Investment Management, LLC 2.8% 1,300,087 +145% 0.01% $4,576,306
GEODE CAPITAL MANAGEMENT, LLC 2.1% 994,764 -7.4% 0% $3,502,527
Trium Capital LLP 2.1% 994,217 +22% 2.5% $3,499,644
STATE STREET CORP 1.9% 898,277 +0.55% 0% $3,161,935
MILLENNIUM MANAGEMENT LLC 1.5% 689,167 +71% 0% $2,425,868
ENVESTNET ASSET MANAGEMENT INC 1.4% 682,711 +171% 0% $2,403,143
Russell Investments Group, Ltd. 1.4% 641,981 +151% 0% $2,259,773
MARSHALL WACE, LLP 1.3% 622,380 +301% 0% $2,190,778
Williams Jones Wealth Management, LLC. 1.3% 613,439 -4% 0.03% $2,159,305
MORGAN STANLEY 1.3% 607,856 -26% 0% $2,139,655
VANGUARD PORTFOLIO MANAGEMENT LLC 1.2% 576,600 0% 0% $2,029,632
Tikvah Management LLC 1.2% 571,619 0% 0.62% $2,012,099
Topline Capital Management, LLC 1.2% 563,135 0.33% $1,982,235
Pier Capital, LLC 1% 492,368 0.29% $1,733,135
DIMENSIONAL FUND ADVISORS LP 0.94% 443,118 +14% 0% $1,559,499
UBS Group AG 0.8% 376,982 +21% 0% $1,326,977
NORTHERN TRUST CORP 0.74% 349,658 +1.2% 0% $1,230,797

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

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2026 Q1 35,610,693 $125,346,171 +$1,551,812 $3.52 120
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
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