Ecovyst Inc. provides specialty catalysts and services in the United States, the Netherlands, the United Kingdom, and internationally. The company operates through two segments, Ecoservices and Catalyst Technologies.

Alto Ingredients, Inc. produces and markets specialty alcohols and essential ingredients in the United States. The company operates in three segments: Marketing and Distribution, Pekin Production, and Other Production.

Lightwave Logic, Inc., a development stage company, focuses on the development of photonic devices and non-linear optical polymer materials systems for fiber-optic data communications and optical computing markets in the United States.

Gevo, Inc. operates as a renewable fuels company. It operates through four segments: Gevo, Agri-Energy, Renewable Natural Gas, and Net-Zero. The company commercializes gasoline, jet fuel, and diesel fuel to achieve zero carbon emissions, and reduce greenhouse gas emissions with sustainable alternatives.

Oil-Dri Corporation of America, together with its subsidiaries, develops, manufactures, and markets sorbent products in the United States and internationally. It operates in two segments, Retail and Wholesale Products Group; and Business to Business Products Group.

Northern Technologies International Corporation develops and markets rust and corrosion inhibiting products and services in North America, South America, Europe, Asia, the Middle East and internationally.

Innospec Inc. develops, manufactures, blends, markets, and supplies specialty chemicals in the United States, rest of North America, the United Kingdom, rest of Europe, and internationally.

NewMarket Corporation, through its subsidiaries, engages in the petroleum additives business. The company offers lubricant additives for use in various vehicle and industrial applications, including engine oils, transmission fluids, off-road powertrain and hydraulic systems, gear oils, hydraulic oils, turbine oils, and other applications where metal-to-metal moving parts are utilized; engine oil additives designed for passenger cars, motorcycles, on and off-road heavy duty commercial equipment, locomotives, and engines in ocean-going vessels; driveline additives designed for products, such as transmission fluids, axle fluids, and off-road powertrain fluids; and industrial additives designed for products for industrial applications consisting of hydraulic fluids, grease, industrial gear fluids, and industrial specialty applications, such as turbine oils.

Quaker Chemical Corporation develops, produces, and markets various formulated chemical specialty products for a range of heavy industrial and manufacturing applications.

Sensient Technologies Corporation, together with its subsidiaries, develops, manufactures, and markets colors, flavors, and other specialty ingredients in North America, Europe, the Asia Pacific, and internationally.

Avient Corporation provides specialized formulator, services, and sustainable material solutions in the United States, Canada, Mexico, Europe, South America, and Asia.

Stepan Company, together with its subsidiaries, produces and sells specialty and intermediate chemicals to other manufacturers for use in various end products.

Minerals Technologies Inc. develops, produces, and markets various specialty mineral, mineral-based, and synthetic mineral products, and supporting systems and services. The company operates through three segments: Performance Materials, Specialty Minerals and Refractories.

Hawkins, Inc. blends, manufactures, and distributes chemicals and other specialty ingredients in the United States and internationally. It operates through three segments: Industrial, Water Treatment, and Health and Nutrition.