Quick Takeaways
- Portolan Capital Management, LLC filed SCHEDULE 13G/A for Quanterix Corp Common Stock, $0.001 par value per share (QTRX).
- Disclosed ownership: 9.4%.
- Date of event: 30 Jun 2025.
Portolan Capital Management, LLC - 30 Jun 2025 SCHEDULE 13G/A Report for Quanterix Corp Common Stock, $0.001 par value per share (QTRX)
- Filing Manager
- Portolan Capital Management, LLC
- Reporting Manager
- Portolan Capital Management, LLC
- Symbol
- QTRX
- Shares outstanding
- 38,820,748 shares
- Disclosed Ownership
- 3,633,622 shares
- Ownership
- 9.4%
- Form type
- SCHEDULE 13G/A
- Filing time
- 13 Aug 2025, 16:10:08 UTC
- Date of event
- 30 Jun 2025
- Previous filing
- 15 May 2025
- SEC
- View on sec.gov
Quoteable Key Fact
"Portolan Capital Management, LLC disclosed 9.4% ownership in Quanterix Corp Common Stock, $0.001 par value per share (QTRX) on 30 Jun 2025."
What Changed
- Previous schedule filing date: 15 May 2025.
- Current filing was accepted on 13 Aug 2025, 16:10.
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 (2)
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Portolan Capital Management, LLC | 9.4% | 3,633,622 | 3,633,622 | 0 | George McCabe | George McCabe/Manager | |
| George McCabe | 9.4% | 3,633,622 | 3,633,622 | 0 | George McCabe | George McCabe |