Quanterix Corporation
US ˙ NasdaqGM ˙ US74766Q1013

SecurityQTRX / Quanterix Corporation
InstitutionState Street Corp
Latest Disclosed Ownership898,277 shares
Latest Disclosed Value $ 3,161,935
State Street Corp reports 0.55% increase in ownership of QTRX / Quanterix Corporation

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 898,277 shares of Quanterix Corporation (US:QTRX) valued at $3,161,935 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 893,401 shares of Quanterix Corporation. This represents a change in shares of 0.55% during the quarter. The current value of the position is $3,413,453 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F QUANTERIX COM 74766Q101 898,277 4,876 0.55 3,162 -44.37 0.0001
2026-02-13 2025-12-31 13F QUANTERIX COM 74766Q101 893,401 73,867 9.01 5,682 27.69 0.0002
2025-11-14 2025-09-30 13F QUANTERIX COM 74766Q101 819,534 54,679 7.15 4,450 -12.50 0.0002
2025-08-14 2025-06-30 13F QUANTERIX COM 74766Q101 764,855 3,547 0.47 5,086 2.62 0.0002
2025-05-15 2025-03-31 13F QUANTERIX COM 74766Q101 761,308 -108,997 -12.52 4,956 -46.43 0.0002
2025-02-14 2024-12-31 13F QUANTERIX COM 74766Q101 870,305 33,862 4.05 9,251 -14.66 0.0004
2024-11-14 2024-09-30 13F QUANTERIX COM 74766Q101 836,443 18,050 2.21 10,840 0.28 0.0004
2024-08-14 2024-06-30 13F QUANTERIX COM 74766Q101 818,393 2,906 0.36 10,811 -43.73 0.0005
2024-05-15 2024-03-31 13F QUANTERIX COM 74766Q101 815,487 6,441 0.80 19,213 -13.14 0.0009
2024-02-14 2023-12-31 13F QUANTERIX COM 74766Q101 809,046 55,748 7.40 22,119 8.19 0.0011
2023-11-14 2023-09-30 13F QUANTERIX COM 74766Q101 753,298 21,830 2.98 20,445 23.95 0.0011
2023-08-14 2023-06-30 13F QUANTERIX COM 74766Q101 731,468 37,729 5.44 16,495 110.97 0.0009
2023-05-15 2023-03-31 13F QUANTERIX COM 74766Q101 693,739 15,791 2.33 7,818 -16.73 0.0004
2023-05-15 2022-12-31 13F/A-99 QUANTERIX COM 74766Q101 677,948 13,906 2.09 9,390 28.30 0.0006
2023-05-15 2022-12-31 13F QUANTERIX COM 74766Q101 677,948 13,906 9,390 0.0006
2022-11-15 2022-09-30 13F QUANTERIX COM 74766Q101 664,042 6,624 1.01 7,318 -31.25 0.0005
2022-08-15 2022-06-30 13F QUANTERIX COM 74766Q101 657,418 17,659 2.76 10,644 -43.00 0.0006
2022-05-16 2022-03-31 13F QUANTERIX COM 74766Q101 639,759 36,529 6.06 18,675 -26.99 0.0009
2022-02-14 2021-12-31 13F QUANTERIX COM 74766Q101 603,230 24,526 4.24 25,577 -11.23 0.0012
2021-11-15 2021-09-30 13F QUANTERIX COM 74766Q101 578,704 25,357 4.58 28,814 -11.23 0.0015
2021-08-16 2021-06-30 13F QUANTERIX COM 74766Q101 553,347 112,564 25.54 32,459 25.94 0.0017
2021-07-09 2021-03-31 13F/A-1 QUANTERIX COM 74766Q101 440,783 45,768 11.59 25,773 40.31 0.0015
2021-05-17 2021-03-31 13F QUANTERIX COM 74766Q101 440,783 45,768 25,773 0.0015
2021-02-16 2020-12-31 13F QUANTERIX COM 74766Q101 395,015 43,007 12.22 18,368 54.65 0.0011
2020-11-10 2020-09-30 13F QUANTERIX COM 74766Q101 352,008 19,719 5.93 11,877 30.50 0.0008
2020-08-14 2020-06-30 13F QUANTERIX COM 74766Q101 332,289 94,343 39.65 9,101 108.21 0.0007
2020-06-19 2020-03-31 13F/A-1 QUANTERIX COM 74766Q101 237,946 -2,386 -0.99 4,371 -23.03 0.0004
2020-05-11 2020-03-31 13F QUANTERIX COM 74766Q101 237,946 -2,386 4,371 383.8618
2020-02-06 2019-12-31 13F QUANTERIX COM 74766Q101 240,332 30,086 14.31 5,679 23.00 0.0004
2019-11-14 2019-09-30 13F QUANTERIX COM 74766Q101 210,246 28,235 15.51 4,617 -24.93 0.0003
2019-08-14 2019-06-30 13F QUANTERIX COM 74766Q101 182,011 68,512 60.36 6,150 109.75 0.0005
2019-05-15 2019-03-31 13F QUANTERIX COM 74766Q101 113,499 7,268 6.84 2,932 50.75 0.0002
2019-02-12 2018-12-31 13F QUANTERIX COM 74766Q101 106,231 23,084 27.76 1,945 9.15 0.0002
2018-11-09 2018-09-30 13F QUANTERIX Common Stock 74766Q101 83,147 17,350 26.37 1,782 88.57 0.0001
2018-08-14 2018-06-30 13F QUANTERIX Common Stock 74766Q101 65,797 10,769 19.57 945 0.96 0.0001
2018-05-15 2018-03-31 13F QUANTERIX Common Stock 74766Q101 55,028 55,028 936 0.0001
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.