Quanterix公司
US ˙ NasdaqGM ˙ US74766Q1013

SecurityQTRX / Quanterix Corporation
InstitutionBarclays Plc
Latest Disclosed Ownership120,203 shares
Latest Disclosed Value $ 764,491
Barclays Plc reports 78.69% increase in ownership of QTRX / Quanterix Corporation

On February 13, 2026 - Barclays Plc filed a 13F-HR form disclosing ownership of 120,203 shares of Quanterix Corporation (US:QTRX) valued at $764,491 USD as of December 31, 2025. The entity filed a previous 13F-HR/A on March 31, 2026 disclosing 67,269 shares of Quanterix Corporation. This represents a change in shares of 78.69% during the quarter. The current value of the position is $456,771 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)
2026-02-13 2025-12-31 13F QUANTERIX COM 74766Q101 120,203 52,934 78.69 764 109.32 0.0002
2026-03-31 2025-09-30 13F/A-3 QUANTERIX COM 74766Q101 67,269 -11,711 -14.83 365 -30.48 0.0001
2026-03-19 2025-09-30 13F/A-2 QUANTERIX COM 74766Q101 146,248 67,268 1,895 0.0005
2025-11-12 2025-09-30 13F QUANTERIX COM 74766Q101 67,269 -11,711 365 0.0001
2026-02-27 2025-06-30 13F/A-2 QUANTERIX COM 74766Q101 78,980 24,119 43.96 525 47.06 0.0001
2025-08-14 2025-06-30 13F/A-1 QUANTERIX COM 74766Q101 78,980 24,119 1 0.0001
2025-08-13 2025-06-30 13F QUANTERIX COM 74766Q101 78,980 24,119 1 0.0000
2026-03-17 2025-03-31 13F/A-1 QUANTERIX COM 74766Q101 54,861 -74,783 -57.68 357 -74.09 0.0001
2025-05-15 2025-03-31 13F QUANTERIX COM 74766Q101 54,861 -74,783 0 0.0001
2026-03-19 2024-12-31 13F/A-1 QUANTERIX COM 74766Q101 129,644 -16,604 -11.35 1,378 -27.28 0.0004
2025-02-13 2024-12-31 13F QUANTERIX COM 74766Q101 129,644 -16,604 1 0.0004
2026-03-31 2024-09-30 13F/A-2 QUANTERIX COM 74766Q101 146,248 43,447 42.26 1,895 39.54 0.0005
2024-11-19 2024-09-30 13F/A-1 QUANTERIX COM 74766Q101 146,248 43,447 2 0.0005
2024-11-15 2024-09-30 13F QUANTERIX COM 74766Q101 146,248 43,447 2 0.0002
2026-03-23 2024-06-30 13F/A-1 QUANTERIX COM 74766Q101 102,801 54,260 111.78 1,358 18.81 0.0004
2024-08-14 2024-06-30 13F QUANTERIX COM 74766Q101 102,801 54,260 1 0.0004
2026-03-24 2024-03-31 13F/A-1 QUANTERIX COM 74766Q101 48,541 -12,643 -20.66 1,144 -31.64 0.0004
2024-05-15 2024-03-31 13F QUANTERIX COM 74766Q101 48,541 -12,643 1 0.0004
2026-03-25 2023-12-31 13F/A-1 QUANTERIX COM 74766Q101 61,184 45,273 284.54 1,673 287.94 0.0006
2024-02-15 2023-12-31 13F QUANTERIX COM 74766Q101 61,184 45,273 2 0.0006
2026-03-26 2023-09-30 13F/A-1 QUANTERIX COM 74766Q101 15,911 2,342 17.26 432 41.31 0.0003
2023-11-07 2023-09-30 13F QUANTERIX COM 74766Q101 15,911 2,342 0 0.0003
2026-03-30 2023-06-30 13F/A-2 QUANTERIX COM 74766Q101 13,569 -3,772 -21.75 306 56.41 0.0002
2023-09-20 2023-06-30 13F/A-1 QUANTERIX COM 74766Q101 13,569 -3,772 0 0.0002
2023-08-03 2023-06-30 13F QUANTERIX COM 74766Q101 13,569 -3,772 0 0.0002
2026-03-30 2023-03-31 13F/A-1 QUANTERIX COM 74766Q101 17,341 8,068 87.01 195 52.34 0.0001
2023-05-04 2023-03-31 13F QUANTERIX COM 74766Q101 17,341 8,068 0 0.0001
2026-03-30 2022-12-31 13F/A-1 QUANTERIX COM 74766Q101 9,273 7,676 480.65 128 611.11 0.0001
2023-02-13 2022-12-31 13F QUANTERIX COM 74766Q101 9,273 7,676 0 0.0001
2022-11-03 2022-09-30 13F QUANTERIX COM 74766Q101 1,597 -265 -14.23 18 -41.94 0.0000
2022-08-12 2022-06-30 13F QUANTERIX COM 74766Q101 1,862 -3,385 -64.51 31 -79.74 0.0000
2022-05-16 2022-03-31 13F QUANTERIX COM 74766Q101 5,247 -32,310 -86.03 153 -90.40 0.0001
2022-02-23 2021-12-31 13F/A-1 QUANTERIX COM 74766Q101 37,557 21,913 140.07 1,593 104.49 0.0006
2022-02-14 2021-12-31 13F QUANTERIX COM 74766Q101 37,557 21,913 1,593 0.0002
2021-11-09 2021-09-30 13F QUANTERIX COM 74766Q101 15,644 2,543 19.41 779 1.43 0.0004
2021-08-13 2021-06-30 13F QUANTERIX COM 74766Q101 13,101 -18,327 -58.31 768 -58.22 0.0004
2021-05-13 2021-03-31 13F QUANTERIX COM 74766Q101 31,428 22,028 234.34 1,838 319.63 0.0010
2021-02-11 2020-12-31 13F QUANTERIX COM 74766Q101 9,400 -286 -2.95 438 33.94 0.0002
2020-11-12 2020-09-30 13F QUANTERIX COM 74766Q101 9,686 -4,431 -31.39 327 -15.28 0.0002
2020-08-12 2020-06-30 13F QUANTERIX COM 74766Q101 14,117 7,106 101.36 386 196.92 0.0003
2020-05-13 2020-03-31 13F QUANTERIX COM 74766Q101 7,011 -6,422 -47.81 130 -58.99 0.0001
2020-02-10 2019-12-31 13F QUANTERIX COM 74766Q101 13,433 -21,881 -61.96 317 -59.15 0.0002
2019-11-15 2019-09-30 13F/A-1 QUANTERIX COM 74766Q101 35,314 29,114 469.58 776 271.29 0.0005
2019-11-14 2019-09-30 13F QUANTERIX COM 74766Q101 35,314 29,114 776 179.4121
2019-08-14 2019-06-30 13F QUANTERIX COM 74766Q101 6,200 2,862 85.74 209 143.02 0.0001
2019-05-15 2019-03-31 13F QUANTERIX COM 74766Q101 3,338 1,983 146.35 86 244.00 0.0001
2019-02-14 2018-12-31 13F QUANTERIX COM 74766Q101 1,355 -3,367 -71.30 25 -75.25 0.0000
2018-11-14 2018-09-30 13F QUANTERIX COM 74766Q101 4,722 4,357 1,193.70 101 1,583.33 0.0001
2018-08-14 2018-06-30 13F QUANTERIX COM 74766Q101 365 -663 -64.49 6 -66.67 0.0000
2018-05-15 2018-03-31 13F QUANTERIX COM 74766Q101 1,028 1,028 18 0.0000
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.