Ecovyst Inc.

Our Board of Directors adopted a Code of Ethics that applies to all of certain senior executive and financial officers, including our Chief Executive Officer and Chief Financial Officer. The full text of our Code of Ethics is available by clicking on “Management & Governance” in the Investors section of our website, www.ecovyst.com.” We intend to post any amendment to, or a waiver from, a provision of our Code of Ethics that applies to our principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions and that relates to any element of the Code of Ethics definition enumerated in paragraph (b) of Item 406 of Regulation S-K by posting such on the same website.