Quanterix Ownership | Who Owns Quanterix?

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Quanterix Ownership Summary

Quanterix is owned by 2.32% institutional investors, 6.33% insiders, and 91.35% retail investors. Ameriprise financial is the largest institutional shareholder, holding 8.34% of QTRX shares. Strategic Advisers U.S. Total Stock is the top mutual fund, with 4.69% of its assets in Quanterix shares.

QTRX Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Quanterix	2.32%	6.33%	91.35%
Sector	Healthcare Stocks	279.42%	10.64%	-190.05%
Industry	Medical Device Stocks	32.07%	10.57%	57.35%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Ameriprise financial	3.21M	8.34%	$34.08M
Blackrock funding, inc. /de	3.16M	8.23%	$33.64M
Blackrock	3.14M	8.23%	$41.45M
Portolan capital management	2.59M	6.73%	$27.51M
Alliancebernstein	2.44M	6.35%	$25.94M
Vanguard group	2.22M	5.77%	$23.57M
William blair investment management	1.06M	2.76%	$11.29M
Easterly investment partners	955.00K	2.48%	$10.15M
Ubs group	934.55K	2.43%	$9.93M
Invenomic capital management lp	902.04K	2.33%	$5.87M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Blue water life science advisors, lp	372.18K	2.40%	$2.42M
Portolan capital management	2.59M	1.85%	$27.51M
Tikvah management	571.62K	1.66%	$6.08M
Ashford capital management	771.30K	1.38%	$10.19M
Easterly investment partners	955.00K	0.80%	$10.15M
Kent lake capital	75.00K	0.45%	$990.75K
Invenomic capital management lp	902.04K	0.30%	$5.87M
Empire financial management company	31.50K	0.10%	$334.85K
Williams jones wealth management, llc.	471.51K	0.06%	$5.01M
Clarivest asset management	43.03K	0.06%	$568.49K

Top Buyers

Holder	Shares	% Assets	Change
Ameriprise financial	3.21M	0.01%	1.69M
William blair investment management	1.06M	0.03%	1.06M
Ubs group	934.55K	0.00%	913.39K
Invenomic capital management lp	902.04K	0.30%	902.04K
Blue water life science advisors, lp	372.18K	2.40%	293.78K

Top Sellers

Holder	Shares	% Assets	Change
Millennium management	55.71K	0.00%	-2.13M
Lord, abbett	-	-	-1.76M
Pier capital	-	-	-848.35K
Alliancebernstein	2.44M	0.01%	-825.80K
Eventide asset management	-	-	-615.00K

New Positions

Holder	Shares	% Assets	Change	Value
William blair investment management	1.06M	0.03%	1.06M	$11.29M
Invenomic capital management lp	902.04K	0.30%	902.04K	$5.87M
Cubist systematic strategies	287.23K	0.01%	287.23K	$1.87M
Graypoint	65.00K	0.04%	65.00K	$690.95K
Two sigma investments, lp	56.96K	0.00%	56.96K	$605.51K

Sold Out

Holder	Change
Eversource wealth advisors	-7.00
True wealth design	-12.00
Manchester capital management	-23.00
Innealta capital	-26.00
Allworth financial lp	-27.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Jun 30, 2024	155	-6.63%	32,401,996	0.36%	84	1.17%	78	-1.27%	47	-16.07%
Mar 31, 2024	166	-6.21%	32,285,203	2.15%	85	1.21%	79	-8.14%	56	-3.45%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Strategic Advisers U.S. Total Stock	1.82M	4.69%	-
CT (Lux) American Smaller Com 9U USD	1.91M	4.09%	-
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%	-
CT American Smaller Coms(US) InstAccGBP	1.22M	2.62%	-2.59K
AB Small Cap Growth A	1.26M	2.53%	-30.56K
Vanguard Total Stock Mkt Idx Inv	1.15M	2.46%	-
iShares Russell 2000 ETF	989.35K	2.13%	-18.80K
Eventide Healthcare & Life Sciences I	615.00K	1.59%	615.00K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Jun 12, 2025	WALT DAVID R	-	Buy	$224.17K
Jun 13, 2025	WALT DAVID R	-	Buy	$760.80K
Jun 09, 2025	Toloue Masoud	President & CEO	Buy	$248.72K
Jun 06, 2025	WALT DAVID R	-	Buy	$716.58K
Jun 09, 2025	WALT DAVID R	-	Buy	$417.22K

Insider Transactions Trends

Date	Buy	Sell
2025 Q3	-	-
2025 Q2	6	-
2025 Q1	-	-
2024 Q4	-	-
2024 Q3	2	-

QTRX Ownership FAQ

Who Owns Quanterix?

Quanterix shareholders are primarily institutional investors at 2.32%, followed by 6.33% insiders and 91.35% retail investors. The average institutional ownership in Quanterix's industry, Medical Device Stocks, is 32.07%, which Quanterix falls below.

Who owns the most shares of Quanterix?

Quanterix’s largest shareholders are Ameriprise financial (3.21M shares, 8.34%), Blackrock funding, inc. /de (3.16M shares, 8.23%), and Blackrock (3.14M shares, 8.23%). Together, they hold 24.80% 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 2.40% of its assets in 372.18K Quanterix shares, valued at 2.42M$.

Who is the top mutual fund holder of Quanterix shares?

Strategic Advisers U.S. Total Stock is the top mutual fund holder of Quanterix shares, with 4.69% of its total shares outstanding invested in 1.82M Quanterix shares.

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