On April 10, 2023, Quanterix Corporation received notice from Keith L. Crandell that he will not stand for re-election at the Company's 2023 Annual Meeting of Stockholders (the “Annual Meeting”), which is expected to be held on June 7, 2023. Mr. Crandell has served as a director of the Company since 2007, the year the Company was founded, and will retire from his directorship, effective as of the Annual Meeting, after 16 years of dedicated service. Mr. Crandell's decision not to stand for re-election was not because of any disagreement with the Company on any matter relating to its operations, policies or practices.