X0508 4 2025-06-12 false 0001503274 Quanterix Corp QTRX 0001205236 WALT DAVID R C/O QUANTERIX CORPORATION, 900 MIDDLESEX TURNPIKE BILLERICA MA 01821 true false false false false Common Stock 2025-06-12 4 P false 36010.00 6.2251 A 1742943.00 D Common Stock 2025-06-13 4 P false 123990.00 6.136 A 1866933.00 D This transaction was executed in multiple trades at prices ranging from $6.17 to $6.31. The price reported reflects the weighted average purchase price. The reporting person undertakes to provide upon request to the SEC staff, the issuer or any security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. Includes 7,435 restricted stock units. This transaction was executed in multiple trades at prices ranging from $5.96 to $6.235 The price reported reflects the weighted average sale price. The reporting person undertakes to provide upon request to the SEC staff, the issuer or any security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. /s/ Brian Keane, as Attorney-in-Fact 2025-06-13