QTRX · Quanterix Corp · Shareholders & Ownership

$3.15 +0.03 (+0.80%) Q2 2026 earnings call transcript

Russell 2000 member Rebalance outlook locked

Market Cap

$147.55M

47.29M

Volume · Oct 29 334.18K Avg daily vol (3M) 745.9K

Every disclosed holder of QTRX in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

How the holder list picks a filing →

Who Owns QTRX

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

Holder group	Holders	Shares	% Out	Summed
Institutional (13F)	131	29,413,850	62.19%	Yes
Insiders (Forms 3, 4, 5)	16	3,560,888	7.53%	Yes
13D/G-only blocks	3	5,405,480	11.43%	Yes
Remaining	—	8,912,847	18.85%	Rest
Registered funds (N-PORT, not summed)	115	12,090,666	25.57%	No

Shares outstanding: 47,293,065, the issuer's latest cover-page count restated onto today's split basis.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of QTRX

One row per holder Every filing By ultimate parent

All 13F Funds Insiders 13D/G Non-US

#	Holder	Shares	% Out	Change	As of	Notes
1	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	3,635,411	7.69%	+357,816	Jun 30, 2026	carried, not yet filed for the newest quarter
1.1	iShares Russell 2000 ETF Fund S000004344 · Registered fund · Jun 30, 2026 iShares Trust, not summed	1,124,040	2.38%	+91,033	Jun 30, 2026	iShares Trust, not summed
1.2	iShares Russell 2000 Value ETF Fund S000004342 · Registered fund · Jun 30, 2026 iShares Trust, not summed	392,069	0.83%	+80,204	Jun 30, 2026	iShares Trust, not summed
1.3	iShares Biotechnology ETF Fund S000004350 · Registered fund · Jun 30, 2026 iShares Trust, not summed	280,438	0.59%	-4,389	Jun 30, 2026	iShares Trust, not summed
1.4	iShares Micro-Cap ETF Fund S000004439 · Registered fund · Jun 30, 2026 iShares Trust, not summed	143,399	0.30%	+38,328	Jun 30, 2026	iShares Trust, not summed
1.5	Master Small Cap Index Series Fund S000002716 · Registered fund · Jun 30, 2026 Quantitative Master Series LLC, not summed	75,825	0.16%	0	Jun 30, 2026	Quantitative Master Series LLC, not summed
2	Blue Water Life Science Advisors, LP 13F CIK 1789778 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,474,202	7.35%	+1,332,055	Jun 30, 2026	carried, not yet filed for the newest quarter
3	First Eagle Investment Management, LLC 13F CIK 1325447 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,753,165	5.82%	+1,453,078	Jun 30, 2026	carried, not yet filed for the newest quarter
3.1	First Eagle Investment Management, LLC 13G CIK 1325447 · Registered investment adviser · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	2,753,165	5.82%	—	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
3.2	First Eagle Small Cap Opportunity Fund Fund S000072438 · Registered fund · Jul 31, 2026 First Eagle Funds, not summed	2,733,357	5.78%	+1,344,860	Jul 31, 2026	First Eagle Funds, not summed
4	Telegraph Hill Partners III, L.P. 13G CIK 1555119 · Unknown · Sep 30, 2025 Rule 13d-1(c), passive investor	2,504,648	5.30%	—	Sep 30, 2025	Rule 13d-1(c), passive investor
5	Kent Lake PR LLC 13D CIK 2037231 · Investment adviser · Jul 11, 2025 Item 4 purpose: Control or board seats	2,089,500	4.42%	-555,586	Jul 11, 2025
6	Portolan Capital Management, LLC 13F CIK 1350290 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,899,308	4.02%	-1,046,515	Jun 30, 2026	carried, not yet filed for the newest quarter
6.1	Portolan Capital Management, LLC 13G CIK 1350290 · Unknown · Jun 30, 2026 Rule 13d-1(c), passive investor, not summed	1,899,308	4.02%	-1,046,515	Jun 30, 2026	Rule 13d-1(c), passive investor, not summed
7	WALT DAVID R Insider CIK 1205236 · Jan 2, 2026 Director, issuer-wide	1,872,890	3.96%	+1,215	Jan 2, 2026	Director, issuer-wide
8	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,800,644	3.81%	+16,031	Jun 30, 2026	carried, not yet filed for the newest quarter
9	Lionhunter Capital Management, LLC 13F CIK 2137268 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,500,427	3.17%	—	Jun 30, 2026	carried, not yet filed for the newest quarter
10	AQR CAPITAL MANAGEMENT LLC 13F CIK 1167557 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,343,005	2.84%	+1,258,873	Jun 30, 2026	carried, not yet filed for the newest quarter
10.1	AQR Small Cap Multi-Style Fund Fund S000040064 · Registered fund · Jun 30, 2026 AQR Funds, not summed	82,168	0.17%	—	Jun 30, 2026	AQR Funds, not summed
11	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	1,254,850	2.65%	0	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
12	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,131,377	2.39%	+136,613	Jun 30, 2026	carried, not yet filed for the newest quarter
13	AMERIPRISE FINANCIAL INC 13F CIK 820027 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	987,424	2.09%	-2,554,950	Jun 30, 2026	carried, not yet filed for the newest quarter
13.1	Columbia Small Cap Value Discovery Fund Fund S000012102 · Registered fund · Jul 31, 2026 COLUMBIA FUNDS SERIES TRUST I, not summed	689,236	1.46%	+24,400	Jul 31, 2026	COLUMBIA FUNDS SERIES TRUST I, not summed
13.2	Columbia Variable Portfolio - Small Cap Value Discovery Fund Fund S000012561 · Registered fund · Jun 30, 2026 COLUMBIA FUNDS VARIABLE INSURANCE TRUST, not summed	124,655	0.26%	-38,780	Jun 30, 2026	COLUMBIA FUNDS VARIABLE INSURANCE TRUST, not summed
14	MARSHALL WACE, LLP 13F CIK 1318757 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	973,872	2.06%	+351,492	Jun 30, 2026	carried, not yet filed for the newest quarter
15	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	932,307	1.97%	+34,030	Jun 30, 2026	carried, not yet filed for the newest quarter
15.1	STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO Fund S000050332 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	13,800	0.03%	0	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
15.2	State Street Total Return V.I.S. Fund Fund S000001637 · Registered fund · Jun 30, 2026 STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed	743	0.00%	-500	Jun 30, 2026	STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
15.3	State Street Balanced Index Fund Fund S000082802 · Registered fund · Jun 30, 2026 STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed	271	0.00%	0	Jun 30, 2026	STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
16	PURA VIDA INVESTMENTS, LLC 13G CIK 1590144 · Registered investment adviser · Dec 31, 2023 Rule 13d-1(b), qualified institution	811,332	1.72%	-1,124,109	Dec 31, 2023	Rule 13d-1(b), qualified institution
17	Tikvah Management LLC 13F CIK 1606477 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	571,555	1.21%	-64	Jun 30, 2026	carried, not yet filed for the newest quarter
18	Toloue Masoud Insider CIK 1867276 · Jan 15, 2026 Director, President & CEO, issuer-wide	507,310	1.07%	-1,136	Jan 15, 2026	Director, President & CEO, issuer-wide
19	VANGUARD PORTFOLIO MANAGEMENT LLC 13F CIK 2100121 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	489,566	1.04%	-87,034	Jun 30, 2026	carried, not yet filed for the newest quarter
20	JACOBS LEVY EQUITY MANAGEMENT, INC 13F CIK 884414 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	487,600	1.03%	+487,600	Jun 30, 2026	carried, not yet filed for the newest quarter
21	VANGUARD EXTENDED MARKET INDEX FUND Fund S000002841 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	482,359	1.02%	-1,756	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
22	MORGAN STANLEY 13F CIK 895421 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	447,688	0.95%	-160,168	Jun 30, 2026	carried, not yet filed for the newest quarter
23	JANE STREET GROUP, LLC 13F CIK 1595888 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	419,050	0.89%	+263,395	Jun 30, 2026	carried, not yet filed for the newest quarter
24	GSA CAPITAL PARTNERS LLP 13F CIK 1362033 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	410,252	0.87%	+314,724	Jun 30, 2026	carried, not yet filed for the newest quarter
25	TUDOR INVESTMENT CORP ET AL 13F CIK 923093 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	400,402	0.85%	+84,401	Jun 30, 2026	carried, not yet filed for the newest quarter
26	DIMENSIONAL FUND ADVISORS LP 13F CIK 354204 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	397,833	0.84%	-45,285	Jun 30, 2026	carried, not yet filed for the newest quarter
26.1	U.S. MICRO CAP PORTFOLIO Fund S000000948 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	159,063	0.34%	+84,757	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
26.2	U.S. VECTOR EQUITY PORTFOLIO Fund S000000982 · Registered fund · Jul 31, 2026 DFA INVESTMENT DIMENSIONS GROUP INC, not summed	358	0.00%	0	Jul 31, 2026	DFA INVESTMENT DIMENSIONS GROUP INC, not summed
27	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	337,227	0.71%	-12,431	Jun 30, 2026	carried, not yet filed for the newest quarter
27.1	Small Cap Index Fund Fund S000001245 · Registered fund · Jun 30, 2026 Northern Funds, not summed	18,085	0.04%	+1,429	Jun 30, 2026	Northern Funds, not summed
28	MEISTER PAUL M Insider CIK 1033876 · Jan 2, 2026 Director, issuer-wide	313,253	0.66%	+3,974	Jan 2, 2026	Director, issuer-wide
29	CHARLES SCHWAB INVESTMENT MANAGEMENT INC 13F CIK 884546 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	310,701	0.66%	-35,212	Jun 30, 2026	carried, not yet filed for the newest quarter
29.1	Schwab U.S. Small-Cap ETF Fund S000026636 · Registered fund · Aug 31, 2026 SCHWAB STRATEGIC TRUST, not summed	204,667	0.43%	-1,845	Aug 31, 2026	SCHWAB STRATEGIC TRUST, not summed
29.2	Schwab Small-Cap Index Fund Fund S000005912 · Registered fund · Jul 31, 2026 SCHWAB CAPITAL TRUST, not summed	104,414	0.22%	+14,013	Jul 31, 2026	SCHWAB CAPITAL TRUST, not summed
30	Madaus Martin D Insider CIK 1310268 · Jan 2, 2025 Director, issuer-wide	291,541	0.62%	+7,435	Jan 2, 2025	Director, issuer-wide
31	VANGUARD FIDUCIARY TRUST CO 13F CIK 933478 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	288,311	0.61%	+17,782	Jun 30, 2026	carried, not yet filed for the newest quarter
32	UBS Group AG 13F CIK 1610520 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	281,978	0.60%	-95,004	Jun 30, 2026	carried, not yet filed for the newest quarter
33	VANGUARD RUSSELL 2000 INDEX FUND Fund S000030003 · Registered fund · Aug 31, 2026 VANGUARD SCOTTSDALE FUNDS, not summed	244,440	0.52%	+31,494	Aug 31, 2026	VANGUARD SCOTTSDALE FUNDS, not summed
34	Nuveen, LLC 13F CIK 1871926 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	232,592	0.49%	+160,750	Jun 30, 2026	carried, not yet filed for the newest quarter
34.1	College Retirement Equities Fund - Total Global Stock Account Fund S000005080 · Registered fund · Jun 30, 2026 College Retirement Equities Fund, not summed	149,880	0.32%	—	Jun 30, 2026	College Retirement Equities Fund, not summed
34.2	Nuveen Small Cap Blend Index Fund Fund S000005367 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	57,995	0.12%	+10,870	Jul 31, 2026	TIAA-CREF Funds, not summed
34.3	Nuveen Equity Index Fund Fund S000005360 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	22,869	0.05%	0	Jul 31, 2026	TIAA-CREF Funds, not summed
34.4	TIAA Separate Account VA-1 - Stock Index Account Fund S000005098 · Registered fund · Jun 30, 2026 TIAA Separate Account VA-1, not summed	914	0.00%	0	Jun 30, 2026	TIAA Separate Account VA-1, not summed
34.5	Nuveen Life Stock Index Fund Fund S000005094 · Registered fund · Jun 30, 2026 TIAA-CREF Life Funds, not summed	537	0.00%	0	Jun 30, 2026	TIAA-CREF Life Funds, not summed
35	CITADEL ADVISORS LLC 13F CIK 1423053 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	229,736	0.49%	+168,735	Jun 30, 2026	carried, not yet filed for the newest quarter
36	XTX Topco Ltd 13F CIK 1828301 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	228,035	0.48%	+116,375	Jun 30, 2026	carried, not yet filed for the newest quarter
37	Point72 Asset Management, L.P. 13F CIK 1603466 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	225,653	0.48%	+132,400	Jun 30, 2026	carried, not yet filed for the newest quarter
38	GOLDMAN SACHS GROUP INC 13F CIK 886982 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	212,056	0.45%	-58,131	Jun 30, 2026	carried, not yet filed for the newest quarter
38.1	Goldman Sachs ActiveBeta(R) U.S. Small Cap Equity ETF Fund S000048296 · Registered fund · Aug 31, 2026 Goldman Sachs ETF Trust, not summed	81,838	0.17%	—	Aug 31, 2026	Goldman Sachs ETF Trust, not summed
38.2	Goldman Sachs Absolute Return Tracker Fund Fund S000020314 · Registered fund · Aug 31, 2026 GOLDMAN SACHS TRUST, not summed	25,647	0.05%	+13,453	Aug 31, 2026	GOLDMAN SACHS TRUST, not summed
39	FMR LLC 13F CIK 315066 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	210,634	0.45%	+27,278	Jun 30, 2026	carried, not yet filed for the newest quarter
39.1	Strategic Advisers U.S. Total Stock Fund Fund S000084926 · Registered fund · Aug 31, 2026 Fidelity Rutland Square Trust II, not summed	1,441,800	3.05%	-258,970	Aug 31, 2026	Fidelity Rutland Square Trust II, not summed
39.2	Fidelity Small Cap Index Fund Fund S000033638 · Registered fund · Jul 31, 2026 Fidelity Salem Street Trust, not summed	464,940	0.98%	+51,798	Jul 31, 2026	Fidelity Salem Street Trust, not summed
39.3	Fidelity Extended Market Index Fund Fund S000006021 · Registered fund · Aug 31, 2026 Fidelity Concord Street Trust, not summed	210,422	0.44%	-20,803	Aug 31, 2026	Fidelity Concord Street Trust, not summed
39.4	Fidelity Enhanced Small Cap Core ETF Fund S000081807 · Registered fund · Jun 30, 2026 Fidelity Covington Trust, not summed	200,221	0.42%	+20,125	Jun 30, 2026	Fidelity Covington Trust, not summed
39.5	Fidelity Total Market Index Fund Fund S000006026 · Registered fund · Aug 31, 2026 Fidelity Concord Street Trust, not summed	78,482	0.17%	-62	Aug 31, 2026	Fidelity Concord Street Trust, not summed
40	IRONWOOD INVESTMENT MANAGEMENT LLC 13F CIK 1127761 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	170,555	0.36%	+730	Jun 30, 2026	carried, not yet filed for the newest quarter
41	DONNELLY WILLIAM P Insider CIK 1207928 · Oct 1, 2026 Director, issuer-wide	169,365	0.36%	+6,964	Oct 1, 2026	Director, issuer-wide
42	SUSQUEHANNA INTERNATIONAL GROUP, LLP 13F CIK 1446194 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	168,620	0.36%	+117,901	Jun 30, 2026	carried, not yet filed for the newest quarter
43	Invesco Ltd. 13F CIK 914208 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	160,887	0.34%	+44,671	Jun 30, 2026	carried, not yet filed for the newest quarter
43.1	Invesco RAFI US 1500 Small-Mid ETF Fund S000013120 · Registered fund · Jul 31, 2026 Invesco Exchange-Traded Fund Trust, not summed	95,537	0.20%	+1,615	Jul 31, 2026	Invesco Exchange-Traded Fund Trust, not summed
43.2	Invesco NASDAQ Future Gen 200 ETF Fund S000077288 · Registered fund · May 31, 2026 Invesco Exchange-Traded Fund Trust II, not summed	11,731	0.02%	+2,631	May 31, 2026	Invesco Exchange-Traded Fund Trust II, not summed
44	WELLS FARGO & COMPANY/MN 13F CIK 72971 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	149,158	0.32%	+20,134	Jun 30, 2026	carried, not yet filed for the newest quarter
45	Susquehanna Portfolio Strategies, LLC 13F CIK 1996449 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	148,618	0.31%	+148,618	Jun 30, 2026	carried, not yet filed for the newest quarter
46	BNP PARIBAS ARBITRAGE, SA 13F CIK 1166588 · Non-US institution · Jun 30, 2026 carried, not yet filed for the newest quarter	136,876	0.29%	+2,473	Jun 30, 2026	carried, not yet filed for the newest quarter
47	Bank of New York Mellon Corp 13F CIK 1390777 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	131,900	0.28%	+5,537	Jun 30, 2026	carried, not yet filed for the newest quarter
48	SCS Capital Management LLC 13F CIK 1303159 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	120,035	0.25%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
49	VANGUARD HEALTH CARE INDEX FUND Fund S000004450 · Registered fund · Aug 31, 2026 VANGUARD WORLD FUND, not summed	118,880	0.25%	-5,780	Aug 31, 2026	VANGUARD WORLD FUND, not summed
50	AMERICAN CENTURY COMPANIES INC 13F CIK 748054 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	100,463	0.21%	-1,347	Jun 30, 2026	carried, not yet filed for the newest quarter

16 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 212 holders

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Key facts CIK 1503274 CUSIP 74766Q101 13F (30d) 18 filings 18 filers Visit website Investor relations