ECOVYST INC.

Ecovyst Inc. is a provider of sulfuric acid regeneration, virgin sulfuric acid and sulfur dioxide and related derivatives essential to its customers' operations and processes. The Company's family of virgin sulfuric acid products, sulfuric acid regeneration services and related derivatives serve a range of industrial applications. The Company is a provider of sulfuric acid recycling to the North American refining industry for the production of alkylate, an essential gasoline component. The Company is a North American producer of high quality and high strength virgin sulfuric acid for industrial and mining applications. Through its Calabrian business, it is also a producer of sulfur dioxide and related derivatives in North America, serving key end uses including mining, water treatment and specialty chemical production. The Company also provides chemical waste handling and treatment services, as well as ex-situ catalyst activation services for the refining and petrochemical industry. Number of employees: 617