SCHEDULE 13D/A

Quanterix Corp

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

Event date: 2025-07-11

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

• Kent Lake Partners LP

  Shares: 2,089,500.00 · Class: 4.5%

• Kent Lake PR LLCReported CIK 0002037231

  Shares: 2,089,500.00 · Class: 4.5%

• Benjamin Natter

  Shares: 2,089,500.00 · Class: 4.5%

• Alexander G. Dickinson

  Shares: 0.00 · Class: 0%

• Bruce Felt

  Shares: 0.00 · Class: 0%

• Hakan Sakul

  Shares: 0.00 · Class: 0%

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