BlackRock, Inc. ownership in QTRX / Quanterix Corporation

Quanterix公司

US ˙ NasdaqGM ˙ US74766Q1013

Security	QTRX / Quanterix Corporation
Institution	BlackRock, Inc.
Latest Disclosed Ownership	2,843,760 shares
Ownership	7.30%

2025-07-17 - BlackRock, Inc. has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 2,843,760 shares of Quanterix Corporation (US:QTRX). This represents 7.3 percent ownership of the company. In their previous filing dated 2024-01-25 , BlackRock, Inc. had reported owning 3,190,625 shares, indicating a decrease of -10.87 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File Date	Effective Date	Form	Prev Shares	Latest Shares	ΔShares (Percent)	Ownership (Percent)	ΔOwnership (Percent)
2025-07-17	2025-07-17	13G/A	3,190,625	2,843,760	-10.87	7.30	-13.10
2024-01-25	2024-01-25	13G/A	2,757,350	3,190,625	15.71	8.40	13.51
2023-01-31	2023-01-31	13G/A	2,456,075	2,757,350	12.27	7.40	10.45
2022-02-04	2022-02-04	13G	1,743,268	2,456,075	40.89	6.70	36.73
2021-03-10	2021-03-10	13G/A	1,743,268	1,743,268	0.00	4.90	0.00
2021-03-10	2021-03-10	13G/A	1,743,043	1,743,268	0.01	4.90	-10.91
2021-02-02	2021-02-02	13G		1,743,043		5.50

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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	Reported Shares	ΔShares	ΔShares (%)	Reported Value (x1000)	ΔValue (%)	Alloc (%)
2026-05-13	2026-03-31	13F	QUANTERIX	COM	74766Q101	3,277,595	-98,315	-2.91	11,537	-46.26	0.0000
2026-02-12	2025-12-31	13F	QUANTERIX	COM	74766Q101	3,375,910	262,930	8.45	21,471	27.02	0.0004
2025-11-12	2025-09-30	13F	QUANTERIX	COM	74766Q101	3,112,980	188,281	6.44	16,903	-13.09	0.0003
2025-08-12	2025-06-30	13F	QUANTERIX	COM	74766Q101	2,924,699	-145,416	-4.74	19,449	-2.69	0.0004
2025-05-02	2025-03-31	13F	QUANTERIX	COM	74766Q101	3,070,115	-94,106	-2.97	19,986	-40.58	0.0004
2025-02-07	2024-12-31	13F	QUANTERIX	COM	74766Q101	3,164,221	-46,695	-1.45	33,636	-19.17	0.0007
2024-11-13	2024-09-30	13F	QUANTERIX	COM	74766Q101	3,210,916	73,484	2.34	41,613	0.41	0.0009
2024-08-13	2024-06-30	13F	QUANTERIX	COM	74766Q101	3,137,432	14,954	0.48	41,445	-43.66	0.0009
2024-05-10	2024-03-31	13F	QUANTERIX	COM	74766Q101	3,122,478	-68,147	-2.14	73,566	-15.67	0.0017
2024-02-13	2023-12-31	13F	QUANTERIX	COM	74766Q101	3,190,625	268,471	9.19	87,232	9.99	0.0022
2023-11-13	2023-09-30	13F	QUANTERIX	COM	74766Q101	2,922,154	62,976	2.20	79,307	23.01	0.0023
2023-08-11	2023-06-30	13F	QUANTERIX	COM	74766Q101	2,859,178	152,442	5.63	64,474	111.36	0.0018
2023-05-12	2023-03-31	13F	QUANTERIX	COM	74766Q101	2,706,736	-50,614	-1.84	30,505	-20.12	0.0009
2023-02-13	2022-12-31	13F	QUANTERIX	COM	74766Q101	2,757,350	79,181	2.96	38,189	29.40	0.0012
2022-11-14	2022-09-30	13F	QUANTERIX	COM	74766Q101	2,678,169	33,594	1.27	29,513	-31.07	0.0010
2022-08-12	2022-06-30	13F	QUANTERIX	COM	74766Q101	2,644,575	204,590	8.38	42,816	-39.88	0.0014
2022-05-12	2022-03-31	13F	QUANTERIX	COM	74766Q101	2,439,985	-16,090	-0.66	71,223	-31.61	0.0019
2022-02-10	2021-12-31	13F	QUANTERIX	COM	74766Q101	2,456,075	42,854	1.78	104,139	-13.33	0.0027
2021-11-09	2021-09-30	13F	QUANTERIX	COM	74766Q101	2,413,221	22,583	0.94	120,155	-14.32	0.0034
2021-08-11	2021-06-30	13F	QUANTERIX	COM	74766Q101	2,390,638	476,336	24.88	140,237	25.29	0.0039
2021-05-07	2021-03-31	13F	QUANTERIX	COM	74766Q101	1,914,302	171,259	9.83	111,928	38.10	0.0033
2021-02-05	2020-12-31	13F	QUANTERIX	COM	74766Q101	1,743,043	-213,915	-10.93	81,050	22.75	0.0026
2020-11-06	2020-09-30	13F	QUANTERIX	COM	74766Q101	1,956,958	371,269	23.41	66,028	52.03	0.0024
2020-08-14	2020-06-30	13F	QUANTERIX	COM	74766Q101	1,585,689	352,287	28.56	43,432	91.68	0.0017
2020-05-01	2020-03-31	13F	QUANTERIX	COM	74766Q101	1,233,402	29,680	2.47	22,659	-20.34	0.0011
2020-02-13	2019-12-31	13F	QUANTERIX	COM	74766Q101	1,203,722	-3,340	-0.28	28,443	7.31	0.0011
2019-11-08	2019-09-30	13F	QUANTERIX	COM	74766Q101	1,207,062	330,003	37.63	26,506	-10.56	0.0011
2019-08-22	2019-06-30	13F/A-1	QUANTERIX	COM	74766Q101	877,059	200,999	29.73	29,636	69.72	0.0013
2019-08-13	2019-06-30	13F	QUANTERIX	COM	74766Q101	877,059	200,999		29,636
2019-05-09	2019-03-31	13F	QUANTERIX	COM	74766Q101	676,060	15,768	2.39	17,462	44.45	0.0008
2019-02-08	2018-12-31	13F	QUANTERIX	COM	74766Q101	660,292	250,571	61.16	12,089	37.77	0.0006
2018-11-09	2018-09-30	13F	QUANTERIX	COM	74766Q101	409,721	163,255	66.24	8,775	147.95	0.0004
2018-08-09	2018-06-30	13F	QUANTERIX	COM	74766Q101	246,466	44,662	22.13	3,539	2.91	0.0002
2018-05-09	2018-03-31	13F	QUANTERIX	COM	74766Q101	201,804	201,804		3,439		0.0002

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.