Form
SCHEDULE 13G
Passive or exempt beneficial ownership filing.
Telegraph Hill Partners III, L.P. - 30 Sep 2025 SCHEDULE 13G Report for Quanterix Corp Common Stock, par value $0.001 (QTRX)
- Filing manager
- Telegraph Hill Partners III, L.P.
- Reporting owner
- Telegraph Hill Partners III, L.P.
- Beneficially owned shares
- 2,504,648 shares
- Large-stake signal
-
Ownership
5.4%Beneficial ownership of this reported class.
Shares
2,504,648 sharesShares beneficially owned as disclosed.
Event date
30 Sep 2025Date tied to the ownership event or amendment.
Accepted by SEC
19 Nov 2025EDGAR acceptance date.
How to read this large-stake filing
- Schedule 13D/G filings focus on beneficial ownership stakes, not a full portfolio.
- Compare this filing with the holder history and issuer page before treating the percentage as a current position.
- Use amendments to understand whether the disclosed stake increased, decreased, or changed reporting status.
- Class ownership
- 5.4%
- Symbol
- QTRX
- Shares outstanding
- 46,382,370 shares
- SEC form
- SCHEDULE 13G
- Accepted by SEC
- 19 Nov 2025, 16:00:08 UTC
- Event date
- 30 Sep 2025
- Source filing
- View source filing
Ownership signal
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Subject security
Names, identifiers, and filing context for this profile.
2 source fields
Source evidence
Original filing metadata and source links for verification.
4 source fields
Key filing fact
Telegraph Hill Partners III, L.P. disclosed 5.4% ownership in Quanterix Corp Common Stock, par value $0.001 (QTRX) on 30 Sep 2025.
Key facts
- Telegraph Hill Partners III, L.P. filed SCHEDULE 13G for Quanterix Corp Common Stock, par value $0.001 (QTRX).
- Disclosed ownership: 5.4%.
- Date of event: 30 Sep 2025.
Change
- No earlier schedule filing is available for direct comparison.
- Current filing was accepted on 19 Nov 2025, 16:00.
Research use
- This page turns one Schedule 13D/G filing into a quick large-stake read before the raw reporting-person rows.
- Use the linked SEC filing as the source of truth for ownership percentages, shares, and reporting-party details.
Evidence
Backed by Schedule 13D/13G
View source filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting persons
Disclosed reporting parties (4)
Names, ownership percentages, 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 |
|---|---|---|---|---|---|---|---|
| Telegraph Hill Partners III, L.P. | 5.4% | 2,504,648 | 0 | 2,504,648 | /s/ Rob Hart | Rob Hart/Partner, Telegraph Hill Partners III Investment Management, LLC, Its: General Partner, Telegraph Hill Partners Mgmt Company LLC, Its: Manager | |
| THP III Affiliates Fund, LLC | 5.4% | 2,504,648 | 0 | 2,504,648 | /s/ Rob Hart | Rob Hart/Partner, Telegraph Hill Partners III Investment Management, LLC, Its: Manager, Telegraph Hill Partners Management Company LLC, Its: Manager | |
| Telegraph Hill Partners III Investment Management, LLC | 5.4% | 2,504,648 | 0 | 2,504,648 | /s/ Rob Hart | Rob Hart/Partner, Telegraph Hill Partners Management Company LLC, Its: Manager | |
| Telegraph Hill Partners Management Company, LLC | 5.4% | 2,504,648 | 0 | 2,504,648 | /s/ Rob Hart | Rob Hart/Partner |
CIK / CUSIP context first