SCHEDULE 13G

Quanterix Corp

Common Stock, par value $0.001 · CUSIP: 74766Q101

Event date: 2025-09-30

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• Telegraph Hill Partners III, L.P.

  Shares: 2,504,648.00 · Class: 5.4%

• THP III Affiliates Fund, LLC

  Shares: 2,504,648.00 · Class: 5.4%

• Telegraph Hill Partners III Investment Management, LLC

  Shares: 2,504,648.00 · Class: 5.4%

• Telegraph Hill Partners Management Company, LLC

  Shares: 2,504,648.00 · Class: 5.4%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.