$QTRX

$3.12 +$0.23 (7.96%) Close

$QTRX Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 47.3M shares outstanding

Who owns QTRX?

By type of holder

Institutions 61.5% Insiders 9.2% Everyone else 29.3%

Concentration Top 10 holders own 45.2%

BlackRock, Inc. 7.7% · Ameriprise Financial Inc 2.1%

Institutional ownership

61.5%

-15.6 pts vs last qtr

Institutional holders

129

+1 vs last qtr

Net shares bought

−7.4M

by institutions in Q2 2026

New / sold out

34 / 33

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Lionhunter Capital Management, LLC NEW +1.5M
First Eagle Investment Management, LLC +1.5M

Biggest sellers in Q2 2026

Ameriprise Financial Inc −2.6M
William Blair Investment Management, LLC SOLD OUT −2.1M

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Quanterix Corporation in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2019–FY2025

+69.9%

+9.24% a year

Each share's claim on the business

−41.2%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $105M

over 7 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years43% 3–5 years8% 1–3 years23% Under 1 year25%

Quarterly turnover

34.7%

of institutional shares changed hands

Top 10 managers, median time held

4 years

Super Investors

Investment managers reporting QTRX on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	3.6M	7.69%	+357.8K (+10.9%)	≤2021	0.0%
Shares held by quarter Peak holding3.6M (Q2'26) Change over 8 quarters+424.5K Share of the company7.690% BlackRock, Inc.'s full portfolio →
AF Ameriprise Financial Inc	987.4K	2.09%	−2.6M (−72.1%)	≤2021	0.0%
Shares held by quarter Peak holding5.0M (Q4'25) Change over 8 quarters−529.8K Share of the company2.090% Ameriprise Financial Inc's full portfolio →

BlackRock, Inc.

3.6M

% of company

7.69%

Change vs last qtr

+357.8K (+10.9%)

Held since

≤2021

Ameriprise Financial Inc

987.4K

% of company

2.09%

Change vs last qtr

−2.6M (−72.1%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Quanterix Corporation, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting QTRX on Form N-PORT; together they hold 29.4% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
FE First Eagle Small Cap Opportunity Fund First Eagle Funds	$9.51M	2.7M	5.78%	0.33%	July 31, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$5.42M	1.3M	2.65%	0.00%	June 30, 2026

First Eagle Small Cap Opportunity Fund

First Eagle Funds

Position value

$9.51M

% of company

5.78%

% of the fund

0.33%

As of

July 31, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$5.42M

% of company

2.65%

% of the fund

0.00%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Quanterix Corporation and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
KL Kent Lake PR LLC 5%+ holder 13D · 4.5%	2.1M	4.42%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company4.420% Disclosed stake13D · 4.5% View the 13D/G filing →
WD Walt David R Insider	1.9M	3.96%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company3.960% Walt David R's insider activity →

Kent Lake PR LLC

5%+ holder13D · 4.5%

2.1M

% of company

4.42%

Change vs last qtr

—

Held since

—

Walt David R

Insider

1.9M

% of company

3.96%

Change vs last qtr

—

Held since

—

15 more holders behind a free account

See every insider and 5%+ holder of Quanterix Corporation.

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