Quanterix Ownership | Who Owns Quanterix?

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Quanterix Ownership Summary

Quanterix is owned by 91.72% institutional investors, 6.45% insiders, and 1.83% retail investors. Portolan capital management is the largest institutional shareholder, holding 10.95% of QTRX shares. CT (Lux) American Smaller Com 9U USD is the top mutual fund, with 4.08% of its assets in Quanterix shares.

QTRX Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Quanterix	91.72%	6.45%	1.83%
Sector	Healthcare Stocks	41.88%	10.83%	47.29%
Industry	Medical Device Stocks	37.80%	10.03%	52.17%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Portolan capital management	4.26M	10.95%	$23.13M
Ameriprise financial	4.24M	10.91%	$23.04B
Blackrock	3.14M	8.23%	$41.45M
Blackrock funding, inc. /de	3.11M	8.00%	$16.90M
Vanguard group	2.65M	6.81%	$14.38M
Invenomic capital management lp	1.39M	3.58%	$7.56M
William blair investment management	1.32M	3.38%	$7.14M
Easterly investment partners	1.25M	3.22%	$6.80M
Geode capital management	1.01M	2.60%	$5.50M
Kent lake pr	1.00M	2.57%	$5.44M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Blue water life science advisors, lp	957.75K	4.74%	$5.20M
Kent lake pr	1.00M	2.75%	$5.44M
Trium capital llp	688.60K	1.46%	$3.74M
Ashford capital management	771.30K	1.38%	$10.19M
Portolan capital management	4.26M	1.25%	$23.13M
Paragon associates & paragon associates ii joint venture	100.67K	0.97%	$546.64K
Tikvah management	571.62K	0.92%	$3.10M
Empire financial management company	452.43K	0.56%	$2.46M
Easterly investment partners	1.25M	0.46%	$6.80M
Ironwood investment management	194.07K	0.46%	$1.05M

Top Buyers

Holder	Shares	% Assets	Change
Balyasny asset management	767.80K	0.01%	723.29K
Portolan capital management	4.26M	1.25%	626.23K
Empire financial management company	452.43K	0.56%	328.45K
Envestnet asset management	515.86K	0.00%	284.26K
Invenomic capital management lp	1.39M	0.37%	248.10K

Top Sellers

Holder	Shares	% Assets	Change
Millennium management	55.71K	0.00%	-2.13M
Lord, abbett	-	-	-1.76M
Kent lake pr	1.00M	2.75%	-1.30M
Pier capital	-	-	-848.35K
Eventide asset management	-	-	-615.00K

New Positions

Holder	Shares	% Assets	Change	Value
Bridgeway capital management	43.00K	0.01%	43.00K	$233.49K
Pharvision advisers	36.14K	0.11%	36.14K	$196.26K
Atom investors lp	19.57K	0.01%	19.57K	$106.27K
R squared	11.77K	0.03%	11.77K	$63.92K
Rockefeller capital management	2.46K	-	2.46K	$13.37K

Sold Out

Holder	Change
Manchester capital management	-23.00
Innealta capital	-26.00
Allworth financial lp	-27.00
Ronald blue trust	-31.00
National bank of canada /fi/	-33.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Sep 30, 2025	128	-2.29%	35,671,807	6.32%	91	1.23%	65	-7.14%	36	-5.26%
Jun 30, 2025	135	-10.60%	34,762,673	-0.84%	89	1.09%	70	-23.91%	41	17.14%
Mar 31, 2025	5	-96.82%	897,525	-97.43%	2	0.03%	5	-93.98%	-	-100.00%
Dec 31, 2024	156	3.31%	34,445,404	3.64%	89	1.20%	83	20.29%	43	-17.31%
Sep 30, 2024	149	-4.49%	33,225,425	2.54%	86	1.20%	67	-14.10%	52	8.33%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
CT (Lux) American Smaller Com 9U USD	1.89M	4.08%	-11.46K
Strategic Advisers U.S. Total Stock	1.89M	4.07%	67.99K
Strategic Advisers U.S. Total Stock{mg}	1.45M	3.79%	91.44K
Strategic Advisers Small-Mid Cap	1.30M	3.39%	283.56K
Vanguard US Total Market Shares ETF	1.15M	2.96%	-
Vanguard Total Stock Mkt Idx Inv	1.25M	2.69%	102.12K
CT American Smaller Coms(US) InstAccGBP	1.23M	2.65%	8.22K
AB Small Cap Growth A	1.26M	2.53%	-30.56K
iShares Russell 2000 ETF	1.01M	2.18%	-
Eventide Healthcare & Life Sciences I	615.00K	1.59%	615.00K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Sep 12, 2025	Sriram Vandana	Chief Financial Officer	Buy	$19.88K
Jun 13, 2025	WALT DAVID R	-	Buy	$760.80K
Jun 12, 2025	WALT DAVID R	-	Buy	$224.17K
Jun 09, 2025	Toloue Masoud	President & CEO	Buy	$248.72K
Jun 06, 2025	WALT DAVID R	-	Buy	$716.58K

Insider Transactions Trends

Date	Buy	Sell
2025 Q4	-	-
2025 Q3	1	-
2025 Q2	6	-
2025 Q1	-	-
2024 Q4	-	-

QTRX Ownership FAQ

Who Owns Quanterix?

Quanterix shareholders are primarily institutional investors at 91.72%, followed by 6.45% insiders and 1.83% retail investors. The average institutional ownership in Quanterix's industry, Medical Device Stocks, is 37.80%, which Quanterix exceeds.

Who owns the most shares of Quanterix?

Quanterix’s largest shareholders are Portolan capital management (4.26M shares, 10.95%), Ameriprise financial (4.24M shares, 10.91%), and Blackrock (3.14M shares, 8.23%). Together, they hold 30.09% of Quanterix’s total shares outstanding.

Does Blackrock own Quanterix?

Yes, BlackRock owns 8.23% of Quanterix, totaling 3.14M shares as of Jun 2024. This represents 0.00% of BlackRock's total assets, with a market value of 41.45M$. In the last quarter, BlackRock increased its holdings by 14.95K shares, a 0.48% change.

Who is Quanterix’s biggest shareholder by percentage of total assets invested?

Blue water life science advisors, lp is Quanterix’s biggest shareholder by percentage of total assets invested, with 4.74% of its assets in 957.75K Quanterix shares, valued at 5.2M$.

Who is the top mutual fund holder of Quanterix shares?

CT (Lux) American Smaller Com 9U USD is the top mutual fund holder of Quanterix shares, with 4.08% of its total shares outstanding invested in 1.89M Quanterix shares.

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