On March 12, 2024, William J. Slocum informed the Nominating & Governance Committee of the Board of Directors (the ?Board?) of Ingevity Corporation (the ?Company?) of his resignation from the Board effective as of March 13, 2024 at 5:00 p.m. Mr. Slocum?s resignation from the Board did not result from any disagreement with the Company on any matter relating to its operations, policies or practices. As disclosed in the Company?s definitive proxy statement on Schedule 14A for its 2024 Annual Meeting of Stockholders (the ?Annual Meeting?), which was filed with the SEC on March 11, 2024, the size of the Board will decrease to 9 effective as of the date of the Annual Meeting.