AMERIPRISE FINANCIAL INC - 31 Dec 2025 SCHEDULE 13G/A Report for Quanterix Corp. Common Stock (QTRX)

Filing Manager
AMERIPRISE FINANCIAL INC
Reporting Manager
Ameriprise Financial, Inc.
Security
Quanterix Corp. Common Stock
Symbol
QTRX
Shares outstanding
46,692,271 shares
Disclosed Ownership
4,996,073 shares
Ownership
11%
Form type
SCHEDULE 13G/A
Filing time
17 Feb 2026, 09:53:39 UTC
Date of event
31 Dec 2025
Previous filing
14 Nov 2025
SEC
View on sec.gov

Reporting Managers (9)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Ameriprise Financial, Inc. 11% 4,996,073 0 4,986,032 /s/ Michael G. Clarke Michael G. Clarke, Senior Vice President, North America Head of Operations & Investor Services
TAM UK International Holdings Limited 6.7% 3,122,967 0 3,122,967 /s/ Michael G. Clarke By: Columbia Mgmt. Investment Advisers, LLC, as Attorney in Fact, By: Michael G. Clarke, SVP, North America Head of Operations & Investor Services
Threadneedle Holdings Limited 2.6% 1,228,954 0 1,228,954 /s/ Michael G. Clarke By: Columbia Mgmt. Investment Advisers, LLC, as Attorney in Fact, By: Michael G. Clarke, SVP, North America Head of Operations & Investor Services
TAM UK Holdings Limited 2.6% 1,228,954 0 1,228,954 /s/ Michael G. Clarke By: Columbia Mgmt. Investment Advisers, LLC, as Attorney in Fact, By: Michael G. Clarke, SVP, North America Head of Operations & Investor Services
Threadneedle Asset Management Holdings Limited 2.6% 1,228,954 0 1,228,954 /s/ Michael G. Clarke By: Columbia Mgmt. Investment Advisers, LLC, as Attorney in Fact, By: Michael G. Clarke, SVP, North America Head of Operations & Investor Services
TC Financing Ltd 2.6% 1,228,954 0 1,228,954 /s/ Michael G. Clarke By: Columbia Mgmt. Investment Advisers, LLC, as Attorney in Fact, By: Michael G. Clarke, SVP, North America Head of Operations & Investor Services
Threadneedle Asset Management Limited 2.6% 1,228,954 0 1,228,954 /s/ Michael G. Clarke By: Columbia Mgmt. Investment Advisers, LLC, as Attorney in Fact, By: Michael G. Clarke, SVP, North America Head of Operations & Investor Services
Threadneedle Investment Services Limited 2.6% 1,228,954 0 1,228,954 /s/ Michael G. Clarke By: Columbia Mgmt. Investment Advisers, LLC, as Attorney in Fact, By: Michael G. Clarke, SVP, North America Head of Operations & Investor Services
Threadneedle Management Luxembourg S.A. 4.1% 1,894,013 0 1,894,013 /s/ Michael G. Clarke By: Columbia Mgmt. Investment Advisers, LLC, as Attorney in Fact, By: Michael G. Clarke, SVP, North America Head of Operations & Investor Services