Quanterix Corp - Common Stock, par value $0.001 (QTRX)

Historical Holders from Q4 2017 to Q3 2025

Symbol: QTRX on Nasdaq
Type / Class: Equity / Common Stock, par value $0.001
Shares outstanding: 46,382,370
All holders as of 30 Sep 2025: Q3 2025
Total 13F shares, excl. options: 35,667,289
Holdings value: $193,650,860
% of all portfolios: 0.001%
Number of holders: 126
Number of buys: 64
Number of sells: -63
Average buys %: +0%
Average sells %: -0%

Reported Shares, Excluding Options vs Price

Reported Value, Excluding Options

Total Investors

Significant Owners of Quanterix Corp - Common Stock, par value $0.001 (QTRX)

Filer	Ownership	Change %	Holdings Value	Net Change	Nb Shares	Change %	Reporting Name	Report Period
AMERIPRISE FINANCIAL INC	9.1%	-14.5%	$23,042,270	+$453,611	4,243,512	+2%	Ameriprise Financial, Inc.	30 Sep 2025
Portolan Capital Management, LLC	9.36%	+21.5%	$21,402,034	+$3,947,625	3,633,622	+22.6%	Portolan Capital Management, LLC	30 Jun 2025
BlackRock, Inc.	7.3%		$18,911,004		2,843,760		BlackRock, Inc.	30 Jun 2025
VANGUARD GROUP INC	6.51%		$14,143,802		2,525,679		The Vanguard Group	31 Mar 2025
Telegraph Hill Partners III, L.P.	5.4%		$12,523,240		2,504,648		Telegraph Hill Partners III, L.P.	30 Sep 2025
Kent Lake PR LLC	4.5%	-34.3%	$13,894,548	-$3,694,480	2,089,500	-21%	Kent Lake PR LLC	11 Jul 2025
ALLIANCEBERNSTEIN L.P.	0.1%	-1%	$207,088	-$13,455,820	36,980	-98.5%	AllianceBernstein L.P.	31 Mar 2025

Institutional Holders of Quanterix Corp - Common Stock, par value $0.001 (QTRX)

Period	Reported Shares, Excl. Options	Value, Excl. Options	Change	Puts Notional Value	Calls Notional Value	Price	Investors
2025 Q3	35,667,289	$193,650,860	+$2,747,086	$74,934	$57,558	$5.43	126
2025 Q2	34,706,219	$230,800,985	-$1,229,254	$0	$0	$6.65	135
2025 Q1	35,052,627	$228,183,737	-$13,775,858	$114,576	$158,844	$6.51	147
2024 Q4	34,986,611	$371,914,799	+$16,121,868	$435,830	$1,280,915	$10.63	149
2024 Q3	33,241,563	$430,807,040	+$1,578,585	$325,296	$396,576	$12.96	148
2024 Q2	32,444,291	$428,581,553	-$24,339,668	$72,655	$515,190	$13.21	154
2024 Q1	32,304,424	$761,091,215	+$14,149,198	$1,562,028	$1,140,304	$23.56	162
2023 Q4	31,606,543	$864,126,575	-$24,356,227	$2,755,872	$2,922,646	$27.34	171
2023 Q3	32,368,786	$878,491,034	-$2,866,513	$3,099,388	$2,627,152	$27.14	157
2023 Q2	32,508,081	$733,059,314	+$7,550,645	$5,569,850	$2,825,515	$22.55	136
2023 Q1	32,857,738	$370,299,549	+$10,875,738	$142,002	$264,845	$11.27	134
2022 Q4	31,640,627	$438,223,400	+$20,742,320	$4,004,310	$1,040,135	$13.85	128
2022 Q3	29,860,035	$329,002,411	-$53,914,115	$240,000	$805,000	$11.02	137
2022 Q2	32,056,174	$519,013,659	-$13,420,976	$0	$164,000	$16.19	126
2022 Q1	32,058,199	$935,417,025	+$5,961,086	$9,726,000	$201,000	$29.19	137
2021 Q4	31,614,679	$1,339,716,574	+$25,726,485	$1,022,000	$1,161,000	$42.4	148
2021 Q3	30,798,959	$1,533,673,090	+$40,652,565	$2,395,000	$8,486,000	$49.79	148
2021 Q2	29,988,923	$1,759,555,578	+$118,333,332	$1,572,000	$2,593,000	$58.66	156
2021 Q1	28,296,161	$1,655,248,478	+$302,307,999	$1,631,000	$1,860,000	$58.47	158
2020 Q4	23,236,863	$1,081,130,529	+$57,531,970	$600,000		$46.5	139
2020 Q3	22,662,885	$764,777,296	+$79,015,895			$33.74	110
2020 Q2	20,335,622	$556,955,810	+$25,091,575			$27.39	88
2020 Q1	19,579,910	$359,723,891	-$8,112,263			$18.37	80
2019 Q4	19,760,825	$466,933,253	+$19,216,424			$23.63	82
2019 Q3	18,912,293	$415,310,210	+$116,253,289			$21.96	86
2019 Q2	13,456,355	$454,666,714	+$139,461,201			$33.79	86
2019 Q1	9,409,606	$243,046,269	+$4,038,727			$25.83	67
2018 Q4	11,619,932	$212,758,568	+$6,126,624			$18.31	59
2018 Q3	8,992,253	$192,610,384	+$4,336,602			$21.42	50
2018 Q2	8,830,428	$126,807,231	+$11,234,140			$14.36	45
2018 Q1	10,039,558	$170,571,569	+$6,281,533			$17.04	40
2017 Q4	9,515,854	$203,688,000	+$203,688,000			$21.47	31