Institutional HoldersBeta

Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.

Quanterix Corp

CIK 0001503274QTRX· quarter ending 2026-06-30

Shares outstanding

47,293,065

as of 2026-08-03 · 10-Q cover page, filed 2026-08-10

Held by 13F filers

32,175,711

68.0% of shares outstanding

Holders

132

+4 vs 2026-03-31 · 36 new, 32 exited

Value

$138.9M

shares -11.7% vs prior quarter

Share classes (cover page of the 10-Q filed 2026-08-10, as of 2026-08-03)

Class	Listed	Shares outstanding	Held by 13F filers	% of class	Holders	CUSIP
Common stock	—	47,293,065	32,175,711	68.0%	132	74766Q101

Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.

Securities (CUSIPs held in 13F this quarter)

tick to combine

Count	CUSIP	Class (as filers write it)	Holders	Shares held	Class shares	% of class	Value	Options	Mapped via
	74766Q101	COM	132	32,175,711	47,293,065	68.0%	$138.9M	3 call / 0 put	13DG	holders →

Totals combine the ticked CUSIPs and update as you tick: common-stock classes by default; preferreds, notes, warrants and depositary shares are listed but not counted. "holders →" shows a single CUSIP on its own. Bonds are held as a principal amount, not shares. Options positions are never counted as holdings.

Top holders (132 of 132 · 74766Q101)

change vs 2026-03-31

#	Filer	Shares	% of class	Value	Change
1	First Eagle Investment Management, LLC	5,506,330	11.64%	$23.8M	+4,206,243 (+323.5%)
2	BlackRock, Inc.	3,635,411	7.69%	$15.7M	+357,816 (+10.9%)
3	Blue Water Life Science Advisors, LP	3,474,202	7.35%	$15.0M	+1,332,055 (+62.2%)
4	Portolan Capital Management, LLC	1,899,308	4.02%	$8.2M	-1,046,515 (-35.5%)
5	VANGUARD CAPITAL MANAGEMENT LLC	1,800,644	3.81%	$7.8M	+16,031 (+0.9%)
6	Lionhunter Capital Management, LLC	1,500,427	3.17%	$6.5M	NEW
7	AQR CAPITAL MANAGEMENT LLC	1,343,005	2.84%	$5.8M	+1,258,873 (+1496.3%)
8	GEODE CAPITAL MANAGEMENT, LLC	1,131,377	2.39%	$4.9M	+136,613 (+13.7%)
9	AMERIPRISE FINANCIAL INC	987,424	2.09%	$4.3M	-2,554,950 (-72.1%)
10	MARSHALL WACE, LLP	973,872	2.06%	$4.2M	+351,492 (+56.5%)
11	STATE STREET CORP	932,307	1.97%	$4.0M	+34,030 (+3.8%)
12	Tikvah Management LLC	571,555	1.21%	$2.5M	-64 (-0.0%)
13	VANGUARD PORTFOLIO MANAGEMENT LLC	489,566	1.04%	$2.1M	-87,034 (-15.1%)
14	JACOBS LEVY EQUITY MANAGEMENT, INC	487,600	1.03%	$2.1M	NEW
15	MORGAN STANLEY	447,688	0.95%	$1.9M	-160,168 (-26.3%)
16	JANE STREET GROUP, LLC	419,050	0.89%	$1.8M	+263,395 (+169.2%)
17	GSA CAPITAL PARTNERS LLP	410,252	0.87%	$1.8M	+314,724 (+329.5%)
18	TUDOR INVESTMENT CORP ET AL	400,402	0.85%	$1.7M	+84,401 (+26.7%)
19	DIMENSIONAL FUND ADVISORS LP	397,833	0.84%	$1.7M	-45,285 (-10.2%)
20	NORTHERN TRUST CORP	337,227	0.71%	$1.5M	-12,431 (-3.6%)
21	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	310,701	0.66%	$1.3M	-35,212 (-10.2%)
22	VANGUARD FIDUCIARY TRUST CO	288,311	0.61%	$1.2M	+17,782 (+6.6%)
23	UBS Group AG	281,978	0.60%	$1.2M	-95,004 (-25.2%)
24	Nuveen, LLC	232,592	0.49%	$1.0M	+160,750 (+223.8%)
25	CITADEL ADVISORS LLC	229,736	0.49%	$992K	+168,735 (+276.6%)
26	XTX Topco Ltd	228,035	0.48%	$985K	+116,375 (+104.2%)
27	Point72 Asset Management, L.P.	225,653	0.48%	$975K	+132,400 (+142.0%)
28	GOLDMAN SACHS GROUP INC	212,056	0.45%	$916K	-58,131 (-21.5%)
29	FMR LLC	210,634	0.45%	$910K	+27,278 (+14.9%)
30	IRONWOOD INVESTMENT MANAGEMENT LLC	170,555	0.36%	$737K	+730 (+0.4%)
31	SUSQUEHANNA INTERNATIONAL GROUP, LLP	168,620	0.36%	$728K	+117,901 (+232.5%)
32	Invesco Ltd.	160,887	0.34%	$695K	+44,671 (+38.4%)
33	WELLS FARGO & COMPANY/MN	149,158	0.32%	$644K	+20,134 (+15.6%)
34	Susquehanna Portfolio Strategies, LLC	148,618	0.31%	$642K	NEW
35	BNP PARIBAS FINANCIAL MARKETS	136,876	0.29%	$591K	+2,473 (+1.8%)
36	Bank of New York Mellon Corp	131,900	0.28%	$570K	+5,537 (+4.4%)
37	SCS Capital Management LLC	120,035	0.25%	$519K	—
38	AMERICAN CENTURY COMPANIES INC	100,463	0.21%	$434K	-1,347 (-1.3%)
39	PRICE T ROWE ASSOCIATES INC /MD/	95,626	0.20%	$414K	+27,254 (+39.9%)
40	Quadrature Capital Ltd	80,200	0.17%	$346K	NEW
41	Cerity Partners LLC	78,083	0.17%	$337K	NEW
42	BRIDGEWAY CAPITAL MANAGEMENT, LLC	68,226	0.14%	$295K	—
43	Clearstead Advisors, LLC	62,261	0.13%	$269K	-61,859 (-49.8%)
44	Jain Global LLC	57,319	0.12%	$248K	NEW
45	ALLIANCEBERNSTEIN L.P.	56,780	0.12%	$200K	+12,300 (+27.7%)
46	ALGERT GLOBAL LLC	55,217	0.12%	$239K	NEW
47	RHUMBLINE ADVISERS	53,557	0.11%	$231K	+1,492 (+2.9%)
48	PEDDOCK CAPITAL ADVISORS, LLC	52,105	0.11%	$225K	—
49	MILLENNIUM MANAGEMENT LLC	40,662	0.09%	$176K	-648,505 (-94.1%)
50	SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC	38,961	0.08%	$168K	NEW
51	CANADA PENSION PLAN INVESTMENT BOARD	38,100	0.08%	$165K	NEW
52	Russell Investments Group, Ltd.	37,722	0.08%	$163K	-604,259 (-94.1%)
53	DEUTSCHE BANK AG\	36,678	0.08%	$158K	+1,218 (+3.4%)
54	IEQ CAPITAL, LLC	35,507	0.08%	$153K	NEW
55	BANK OF AMERICA CORP /DE/	29,286	0.06%	$127K	-20,266 (-40.9%)
56	WEALTH ENHANCEMENT ADVISORY SERVICES, LLC	26,914	0.06%	$104K	NEW
57	MERCER GLOBAL ADVISORS INC /ADV	25,731	0.05%	$111K	+14,856 (+136.6%)
58	AXQ CAPITAL, LP	25,599	0.05%	$111K	+1,245 (+5.1%)
59	MetLife Investment Management, LLC	24,801	0.05%	$107K	+2,225 (+9.9%)
60	Aigen Investment Management, LP	24,328	0.05%	$105K	NEW
61	OSAIC HOLDINGS, INC.	24,176	0.05%	$104K	+1,360 (+6.0%)
62	Dynamic Technology Lab Private Ltd	20,816	0.04%	$90K	-57,055 (-73.3%)
63	LPL Financial LLC	20,099	0.04%	$87K	-5,582 (-21.7%)
64	CITIGROUP INC	19,713	0.04%	$85K	+17,751 (+904.7%)
65	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	19,655	0.04%	$85K	+75 (+0.4%)
66	JPMORGAN CHASE & CO	19,049	0.04%	$86K	+1,638 (+9.4%)
67	Creative Planning	18,538	0.04%	$80K	NEW
68	Vanguard Global Advisers, LLC	18,525	0.04%	$80K	—
69	D. E. Shaw & Co., Inc.	17,672	0.04%	$76K	NEW
70	NISA INVESTMENT ADVISORS, LLC	17,356	0.04%	$75K	NEW
71	BARCLAYS PLC	15,805	0.03%	$68K	-941 (-5.6%)
72	HUB Investment Partners, LLC	15,734	0.03%	$68K	+2,073 (+15.2%)
73	Mariner, LLC	15,471	0.03%	$67K	NEW
74	Engineers Gate Manager LP	14,807	0.03%	$64K	-8,993 (-37.8%)
75	Jump Financial, LLC	14,700	0.03%	$64K	-13,730 (-48.3%)
76	CAPTRUST FINANCIAL ADVISORS	14,301	0.03%	$62K	NEW
77	MANUFACTURERS LIFE INSURANCE COMPANY, THE	13,788	0.03%	$60K	+2,376 (+20.8%)
78	HighTower Advisors, LLC	13,660	0.03%	$59K	NEW
79	Vanguard Personalized Indexing Management, LLC	13,239	0.03%	$57K	NEW
80	PharVision Advisers, LLC	13,039	0.03%	$56K	NEW
81	Schonfeld Strategic Advisors LLC	12,663	0.03%	$55K	-30,123 (-70.4%)
82	Post Resch Tallon Group Inc.	12,500	0.03%	$54K	—
83	Qube Research & Technologies Ltd	11,987	0.03%	$52K	NEW
84	KESTRA PRIVATE WEALTH SERVICES, LLC	11,294	0.02%	$49K	NEW
85	IMC-Chicago, LLC	10,214	0.02%	$44K	NEW
86	Police & Firemen's Retirement System of New Jersey	10,062	0.02%	$43K	—
87	Cresset Asset Management, LLC	10,000	0.02%	$43K	NEW
88	Arax Advisory Partners	7,558	0.02%	$33K	NEW
89	SIMPLEX TRADING, LLC	7,127	0.02%	$31K	NEW
90	PNC Financial Services Group, Inc.	7,123	0.02%	$31K	+5,550 (+352.8%)
91	NEW YORK STATE COMMON RETIREMENT FUND	6,501	0.01%	$28K	—
92	Legal & General Group Plc	3,993	0.01%	$17K	—
93	Ameritas Investment Partners, Inc.	3,475	0.01%	$15K	—
94	Tower Research Capital LLC (TRC)	3,108	0.01%	$13K	-879 (-22.0%)
95	Sachetta, LLC	3,000	0.01%	$13K	NEW
96	Allworth Financial LP	2,143	0.00%	$9K	+2,032 (+1830.6%)
97	GROUP ONE TRADING LLC	1,933	0.00%	$8K	+1,061 (+121.7%)
98	Pinnacle Wealth Planning Services, Inc.	1,799	0.00%	$8K	—
99	EverSource Wealth Advisors, LLC	1,503	0.00%	$6K	+1,448 (+2632.7%)
100	ROYAL BANK OF CANADA	1,475	0.00%	$7K	-230,626 (-99.4%)
101	True Wealth Design, LLC	1,068	0.00%	$5K	+917 (+607.3%)
102	NewEdge Advisors, LLC	1,000	0.00%	$4K	—
103	Sterling Capital Management LLC	860	0.00%	$4K	-415 (-32.5%)
104	Wilmington Savings Fund Society, FSB	800	0.00%	$3K	—
105	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	771	0.00%	$3K	—
106	Essential Partners LLC	640	0.00%	$3K	-1,077 (-62.7%)
107	MassMutual Private Wealth & Trust, FSB	600	0.00%	$3K	NEW
108	CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM	585	0.00%	$3K	-1,804 (-75.5%)
109	Pinnacle Bancorp, Inc.	520	0.00%	$2K	—
110	GAMMA Investing LLC	299	0.00%	$1K	-391 (-56.7%)
111	SIT INVESTMENT ASSOCIATES INC	272	0.00%	$1K	—
112	Farther Finance Advisors, LLC	249	0.00%	$1K	NEW
113	ROTHSCHILD INVESTMENT LLC	207	0.00%	$894	+186 (+885.7%)
114	US BANCORP \DE\	202	0.00%	$873	-324 (-61.6%)
115	Fortitude Family Office, LLC	201	0.00%	$868	+95 (+89.6%)
116	Physician Wealth Advisors, Inc.	198	0.00%	$856	NEW
117	Avion Wealth	198	0.00%	$0	NEW
118	Bare Financial Services, Inc	184	0.00%	$795	NEW
119	Rockefeller Capital Management L.P.	175	0.00%	$756	-73 (-29.4%)
120	Wealth Enhancement Trust Services, Inc.	161	0.00%	$696	NEW
121	Bogart Wealth, LLC	156	0.00%	$674	NEW
122	Ritter Daniher Financial Advisory LLC / DE	150	0.00%	$648	NEW
123	Optiver Holding B.V.	101	0.00%	$436	-344 (-77.3%)
124	Concord Wealth Partners	100	0.00%	$432	NEW
125	North Star Investment Management Corp.	100	0.00%	$432	—
126	JONES FINANCIAL COMPANIES LLLP	73	0.00%	$315	—
127	SBI Securities Co., Ltd.	62	0.00%	$268	—
128	SJS Investment Consulting Inc.	60	0.00%	$260	+53 (+757.1%)
129	Cypress Capital Management LLC (WY)	60	0.00%	$259	—
130	Transamerica Financial Advisors, LLC	39	0.00%	$168	—
131	HUNTINGTON NATIONAL BANK	39	0.00%	$168	—
132	STRS OHIO	29	0.00%	$125	—

Exited since 2026-03-31 (32 filers; largest 25 shown)

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC	−2,083,699
Invenomic Capital Management LP	−1,932,386
LEVIN CAPITAL STRATEGIES, L.P.	−1,464,052
Trium Capital LLP	−994,217
Empire Financial Management Company, LLC	−736,068
ENVESTNET ASSET MANAGEMENT INC	−682,711
Williams Jones Wealth Management, LLC.	−613,439
Topline Capital Management, LLC	−563,135
Pier Capital, LLC	−492,368
Parkman Healthcare Partners LLC	−341,453
RENAISSANCE TECHNOLOGIES LLC	−136,207
Brevan Howard Capital Management LP	−87,386
STATE OF WISCONSIN INVESTMENT BOARD	−84,124
HRT FINANCIAL LP	−71,686
PDT Partners, LLC	−47,668
Quantinno Capital Management LP	−47,594
FOX RUN MANAGEMENT, L.L.C.	−39,592
TWO SIGMA INVESTMENTS, LP	−35,185
Virtu Financial LLC	−18,988
Allspring Global Investments Holdings, LLC	−17,216
INTECH INVESTMENT MANAGEMENT LLC	−11,666
CWM, LLC	−7,626
Versant Capital Management, Inc	−1,832
NATIONAL BANK OF CANADA /FI/	−627
NBC SECURITIES, INC.	−414

Large holders from 13D/13G (latest per reporting person, last 2 years)

Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.

Reporting person	Form	Filed	Event	Shares	% of class
George McCabe	SCHEDULE 13G/A	2026-08-14	2026-06-30	1,899,308	4.02%
Portolan Capital Management, LLC	SCHEDULE 13G/A	2026-08-14	2026-06-30	1,899,308	4.02%
First Eagle Investment Management, LLC	SCHEDULE 13G	2026-08-06	2026-06-30	2,753,165	5.8%
FIRST EAGLE SMALL CAP OPPORTUNITY FUND	SCHEDULE 13G	2026-08-06	2026-06-30	2,421,533	5.1%
Ameriprise Financial, Inc.	SCHEDULE 13G/A	2026-05-15	2026-03-31	3,542,374	7.5%
The Vanguard Group	SCHEDULE 13G/A	2026-03-27	2026-03-13	0	0%
Threadneedle Asset Management Limited	SCHEDULE 13G/A	2026-02-17	2025-12-31	1,228,954	2.6%
Threadneedle Asset Management Holdings Limited	SCHEDULE 13G/A	2026-02-17	2025-12-31	1,228,954	2.6%
Threadneedle Holdings Limited	SCHEDULE 13G/A	2026-02-17	2025-12-31	1,228,954	2.6%
Threadneedle Investment Services Limited	SCHEDULE 13G/A	2026-02-17	2025-12-31	1,228,954	2.6%
Threadneedle Management Luxembourg S.A.	SCHEDULE 13G/A	2026-02-17	2025-12-31	1,894,013	4.1%
TC Financing Ltd	SCHEDULE 13G/A	2026-02-17	2025-12-31	1,228,954	2.6%
TAM UK International Holdings Limited	SCHEDULE 13G/A	2026-02-17	2025-12-31	3,122,967	6.7%
TAM UK Holdings Limited	SCHEDULE 13G/A	2026-02-17	2025-12-31	1,228,954	2.6%
Telegraph Hill Partners III Investment Management, LLC	SCHEDULE 13G	2025-11-19	2025-09-30	2,504,648	5.4%
Telegraph Hill Partners III, L.P.	SCHEDULE 13G	2025-11-19	2025-09-30	2,504,648	5.4%
THP III Affiliates Fund, LLC	SCHEDULE 13G	2025-11-19	2025-09-30	2,504,648	5.4%
Telegraph Hill Partners Management Company, LLC	SCHEDULE 13G	2025-11-19	2025-09-30	2,504,648	5.4%
BlackRock, Inc.	SCHEDULE 13G/A	2025-07-17	2025-06-30	2,843,760	7.3%
Kent Lake Partners LP	SCHEDULE 13D/A	2025-07-15	2025-07-11	2,089,500	4.5%
Kent Lake PR LLC	SCHEDULE 13D/A	2025-07-15	2025-07-11	2,089,500	4.5%
Hakan Sakul	SCHEDULE 13D/A	2025-07-15	2025-07-11	0	0%
Bruce Felt	SCHEDULE 13D/A	2025-07-15	2025-07-11	0	0%
Benjamin Natter	SCHEDULE 13D/A	2025-07-15	2025-07-11	2,089,500	4.5%
Alexander G. Dickinson	SCHEDULE 13D/A	2025-07-15	2025-07-11	0	0%
AllianceBernstein L.P.	SCHEDULE 13G/A	2025-05-14	2025-03-31	36,980	0.1%
Akoya Biosciences, Inc.	SCHEDULE 13D/A	2025-04-30	2025-01-09	0	0%
Israel A. Englander	SCHEDULE 13G/A	2025-04-23	2025-03-31	55,713	0.1%
Integrated Core Strategies (US) LLC	SCHEDULE 13G/A	2025-04-23	2025-03-31	0	0%
Millennium Management LLC	SCHEDULE 13G/A	2025-04-23	2025-03-31	55,713	0.1%
Millennium Group Management LLC	SCHEDULE 13G/A	2025-04-23	2025-03-31	55,713	0.1%

Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.