Quanterix Corp

Securities Trading Plans of Directors and Executive Officers

On March 13, 2024, The Martin D. Madaus GST Exempt 2012 Irrevocable Trust, of which Martin Madaus, a member of our Board of Directors, isa trust advisor who shares voting and investment power over the shares held by the trust, adopted a trading plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Securities Exchange Act of 1934. The Rule 10b5-1 trading plan provides for the potential sale of up to 82,500 shares of our common stock beginning on June 17, 2024. The plan will terminate at the earlier of the execution of all trading orders under the plan or December 27, 2024.

During the three months ended March 31, 2024, none of our other directors or officers adopted or terminated any contract, instruction or written plan for the purchase or sale of our securities that was intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) or any “non-Rule 10b5-1 trading arrangement” (as defined in Item 408(c) of Regulation S-K).