Quick Takeaways
- AMERIPRISE FINANCIAL INC filed SCHEDULE 13G/A for Quanterix Corp. Common Stock (QTRX).
- Disclosed ownership: 11%.
- Date of event: 31 Dec 2025.
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
Quoteable Key Fact
"AMERIPRISE FINANCIAL INC disclosed 11% ownership in Quanterix Corp. Common Stock (QTRX) on 31 Dec 2025."
What Changed
- Previous schedule filing date: 14 Nov 2025.
- Current filing was accepted on 17 Feb 2026, 09:53.
Why This Matters
- This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
- You can verify ownership claims directly against the original SEC filing.
Source Evidence
Backed by Schedule 13D/13G
See Original Filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
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 |