Quanterix Corporation (QTRX)
Nasdaq: QTRX · Laboratory Analytical Instruments · Billerica, MA · filing with the SEC since 2010
Who owns Quanterix Corporation
As filed with the SECHolders of 5% or more
4
Ameriprise Financial, Inc. holds 7.5% of Common Stock, as its SCHEDULE 13G/A filed May 15, 2026 says.
Directors and officers
18
report now, of 40 people on the record since 2017. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 4 named at left.
Holders of 5% or moreshare of the class, as filed
Ameriprise Financial, Inc.
SCHEDULE 13G/A · filed May 15, 2026 · Common Stock · 2.1% in May 7, 2026
Blackrock, Inc.
SCHEDULE 13G/A · filed Jul 17, 2025 · Common Stock
First Eagle Investment Management, LLC
SCHEDULE 13G · filed Aug 6, 2026 · Common
Telegraph Hill Partners III, L.P.
SCHEDULE 13G · filed Nov 19, 2025 · Common Stock, par value $0.001
Kent Lake Partners LP
SCHEDULE 13D/A · filed Jul 15, 2025 · Common Stock, $0.001 par value per share · reported falling below 5%, from 6.9% in Mar 3, 2025
Portolan Capital Management, LLC
SCHEDULE 13G/A · filed Aug 14, 2026 · Common Stock, $0.001 par value per share · reported falling below 5%, from 6.25% in May 15, 2026
AllianceBernstein L.P.
SCHEDULE 13G/A · filed May 14, 2025 · Common Stock · reported falling below 5%, from 6.3% in Feb 5, 2025
Millennium Management LLC
SCHEDULE 13G/A · filed Apr 23, 2025 · Common Stock, par value $0.001 per share · reported falling below 5%
The Vanguard Group
SCHEDULE 13G/A · filed Mar 27, 2026 · Common Stock · reported falling below 5%, from 6.51% in Apr 30, 2025
Akoya Biosciences, Inc.
SCHEDULE 13D/A · filed Apr 30, 2025 · Common Stock, par value $0.001 per share · reported falling below 5%, from 6.2% in Jan 16, 2025
What QTRX reports owning in othersstakes of 5% or more, and other ties
Akoya Biosciences, Inc.
SCHEDULE 13D/A · filed Apr 30, 2025 · Common Stock, $0.00001 par value per share
Other ties the annual report names
Akoya Biosciences, Inc.
An entity · co registrant · owns, named in the 10-K filed Mar 2, 2026
Akoya Biosciences, Inc.
A company bought · acquisition, legal entity · Sep 2025 · owns, named in the 10-K filed Mar 2, 2026
Emission Inc.
A company bought · acquisition, related party · owns, named in the 10-K filed Mar 2, 2026
9 subsidiaries in 6 countries, from the list filed with the 10-K filed Mar 2, 2026.
Insider tradesForm 4
0sales
3purchases
0sales on a scheduled plan
0people selling
$0sold, in dollars
$300,000bought, in dollars
Open-market trades on Form 4 from Oct 16, 2025 to Oct 16, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2026 runs to Oct 16, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window2 of 60 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Donnelly William P | Executive Chair | 0 | $0 | 0 | 2 | $300,000 |
| Meadows Benjamin | Chief Commercial Officer | 0 | $0 | 0 | 1 | $0 |