Quanterix Corporation
US ˙ NasdaqGM ˙ US74766Q1013

SecurityQTRX / Quanterix Corporation
InstitutionMorgan Stanley
Latest Disclosed Ownership607,856 shares
Latest Disclosed Value $ 2,139,655
Morgan Stanley reports 26.14% decrease in ownership of QTRX / Quanterix Corporation

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 607,856 shares of Quanterix Corporation (US:QTRX) valued at $2,139,653 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 822,998 shares of Quanterix Corporation. This represents a change in shares of -26.14% during the quarter. The current value of the position is $2,005,925 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 607,856 -215,142 -26.14 2,140 -59.13 0.0001
2026-05-27 2025-12-31 13F/A-1 QUANTERIX COM 74766Q101 822,998 16,735 2.08 5,234 19.55 0.0003
2026-02-13 2025-12-31 13F QUANTERIX COM 74766Q101 822,998 16,735 5,234 0.0003
2026-05-27 2025-09-30 13F/A-1 QUANTERIX COM 74766Q101 806,263 34,823 4.51 4,378 -14.66 0.0003
2025-11-14 2025-09-30 13F QUANTERIX COM 74766Q101 806,263 34,823 4,378 0.0003
2025-08-15 2025-06-30 13F QUANTERIX COM 74766Q101 771,440 175,391 29.43 5,130 32.22 0.0003
2025-05-15 2025-03-31 13F QUANTERIX COM 74766Q101 596,049 345,229 137.64 3,880 45.54 0.0003
2025-05-15 2024-12-31 13F/A-1 QUANTERIX COM 74766Q101 250,820 -57,361 -18.61 2,666 -33.25 0.0002
2025-02-14 2024-12-31 13F QUANTERIX COM 74766Q101 250,820 -57,361 2,666 0.0002
2025-05-14 2024-09-30 13F/A-2 QUANTERIX COM 74766Q101 308,181 121,695 65.26 3,994 62.16 0.0003
2025-02-14 2024-09-30 13F/A-1 QUANTERIX COM 74766Q101 308,181 121,695 3,994 0.0003
2024-11-14 2024-09-30 13F QUANTERIX COM 74766Q101 308,181 121,695 3,994 0.0003
2025-05-14 2024-06-30 13F/A-2 QUANTERIX COM 74766Q101 186,486 -29,346 -13.60 2,463 -51.56 0.0002
2024-10-17 2024-06-30 13F/A-1 QUANTERIX COM 74766Q101 186,486 -29,346 2,463 0.0002
2024-08-14 2024-06-30 13F QUANTERIX COM 74766Q101 186,486 -29,346 2,463 0.0002
2024-10-17 2024-03-31 13F/A-2 QUANTERIX COM 74766Q101 215,832 -134,051 -38.31 5,085 -46.84 0.0004
2024-08-16 2024-03-31 13F/A-1 QUANTERIX COM 74766Q101 215,832 -134,051 5,085 0.0004
2024-05-15 2024-03-31 13F QUANTERIX COM 74766Q101 215,832 -134,051 5,085 0.0004
2024-08-16 2023-12-31 13F/A-1 QUANTERIX COM 74766Q101 349,883 46,774 15.43 9,566 16.28 0.0008
2024-02-13 2023-12-31 13F QUANTERIX COM 74766Q101 349,883 46,774 9,566 0.0008
2023-11-15 2023-09-30 13F QUANTERIX COM 74766Q101 303,109 3,880 1.30 8,226 21.92 0.0008
2023-08-14 2023-06-30 13F QUANTERIX COM 74766Q101 299,229 38,947 14.96 6,748 130.04 0.0007
2023-05-15 2023-03-31 13F QUANTERIX COM 74766Q101 260,282 17,009 6.99 2,933 -12.94 0.0003
2023-02-14 2022-12-31 13F QUANTERIX COM 74766Q101 243,273 -11,012 -4.33 3,369 20.24 0.0004
2022-11-14 2022-09-30 13F QUANTERIX COM 74766Q101 254,285 176,559 227.16 2,802 122.73 0.0004
2022-10-27 2022-06-30 13F/A-1 QUANTERIX COM 74766Q101 77,726 -42,182 -35.18 1,258 -64.06 0.0002
2022-08-15 2022-06-30 13F QUANTERIX COM 74766Q101 77,726 -42,182 1,258 0.0000
2022-10-27 2022-03-31 13F/A-1 QUANTERIX COM 74766Q101 119,908 86,843 262.64 3,500 149.64 0.0005
2022-05-13 2022-03-31 13F QUANTERIX COM 74766Q101 119,908 86,843 3,500 0.0005
2022-02-14 2021-12-31 13F QUANTERIX COM 74766Q101 33,065 5,479 19.86 1,402 2.19 0.0002
2021-11-15 2021-09-30 13F QUANTERIX COM 74766Q101 27,586 -13,873 -33.46 1,372 -43.61 0.0002
2021-08-23 2021-06-30 13F/A-1 QUANTERIX COM 74766Q101 41,459 -153,721 -78.76 2,433 -78.68 0.0003
2021-08-16 2021-06-30 13F QUANTERIX COM 74766Q101 41,459 -153,721 2,433 0.0001
2021-05-17 2021-03-31 13F QUANTERIX COM 74766Q101 195,180 122,975 170.31 11,413 239.87 0.0017
2021-02-16 2020-12-31 13F QUANTERIX COM 74766Q101 72,205 -132,938 -64.80 3,358 -51.48 0.0005
2020-11-13 2020-09-30 13F QUANTERIX COM 74766Q101 205,143 8,350 4.24 6,921 28.40 0.0013
2020-08-14 2020-06-30 13F QUANTERIX COM 74766Q101 196,793 180,066 1,076.50 5,390 1,655.70 0.0012
2020-05-26 2020-03-31 13F/A-1 QUANTERIX COM 74766Q101 16,727 -8,600 -33.96 307 -48.75 0.0001
2020-05-15 2020-03-31 13F QUANTERIX COM 74766Q101 16,727 -8,600 307 23.5840
2020-02-14 2019-12-31 13F QUANTERIX COM 74766Q101 25,327 -14,546 -36.48 599 -31.62 0.0001
2019-11-14 2019-09-30 13F QUANTERIX COM 74766Q101 39,873 1,629 4.26 876 -32.20 0.0002
2019-08-14 2019-06-30 13F QUANTERIX COM 74766Q101 38,244 -67,754 -63.92 1,292 -52.81 0.0003
2019-05-15 2019-03-31 13F QUANTERIX COM 74766Q101 105,998 89,056 525.65 2,738 780.39 0.0008
2019-02-14 2018-12-31 13F QUANTERIX COM 74766Q101 16,942 -94 -0.55 311 -15.03 0.0001
2019-04-23 2018-09-30 13F/A-2 QUANTERIX COM 74766Q101 17,036 3,989 30.57 366 95.72 0.0001
2018-11-20 2018-09-30 13F/A-1 QUANTERIX COM 74766Q101 17,036 0 366 0.0001
2018-11-14 2018-09-30 13F QUANTERIX COM 74766Q101 17,036 3,989 366
2019-04-23 2018-06-30 13F/A-1 QUANTERIX COM 74766Q101 13,047 -86 -0.65 187 -16.52 0.0001
2018-08-14 2018-06-30 13F QUANTERIX COM 74766Q101 13,047 -86 187
2019-04-23 2018-03-31 13F/A-1 QUANTERIX COM 74766Q101 13,133 -1,567 -10.66 224 -29.11 0.0001
2018-05-14 2018-03-31 13F QUANTERIX COM 74766Q101 13,133 -1,567 224
2019-04-23 2017-12-31 13F/A-1 QUANTERIX COM 74766Q101 14,700 14,700 316 0.0001
2018-02-14 2017-12-31 13F QUANTERIX COM 74766Q101 14,700 316 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.