Key facts
- AMERIPRISE FINANCIAL INC filed SCHEDULE 13G/A for Quanterix Corp Common Stock (QTRX).
- Disclosed ownership: 7.5%.
- Date of event: 31 Mar 2026.
AMERIPRISE FINANCIAL INC - 31 Mar 2026 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
- 47,231,653 shares
- Disclosed Ownership
- 3,542,374 shares
- Ownership
- 7.5%
- Form type
- SCHEDULE 13G/A
- Filing time
- 15 May 2026, 10:36:24 UTC
- Date of event
- 31 Mar 2026
- Previous filing
- 17 Feb 2026
- Next filing
- 07 May 2026
- SEC
- View on sec.gov
Key filing fact
AMERIPRISE FINANCIAL INC disclosed 7.5% ownership in Quanterix Corp Common Stock (QTRX) on 31 Mar 2026.
Change
- Previous schedule filing date: 17 Feb 2026.
- Current filing was accepted on 15 May 2026, 10:36.
Research use
- 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.
Evidence
Backed by Schedule 13D/13G
See Original Filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting persons
Reporting managers (1)
Names, ownership, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Ameriprise Financial, Inc. | 7.5% | 3,542,374 | 0 | 3,542,374 | /s/ Michael G. Clarke | Michael G. Clarke, Senior Vice President, North America Head of Operations & Investor Services |
CIK / CUSIP context first