SI Group

SI Group is a developer and manufacturer of performance additives, process solutions, active pharmaceutical ingredients, and chemical intermediates serving diverse industrial markets. Founded in 1906, the company operates 18 manufacturing sites and joint ventures globally, with approximately 1,500 employees and headquarters in The Woodlands, Texas.

The company's technical portfolio spans fuel and lubricant additives, oilfield chemicals, plastics stabilization solutions, rubber and adhesives products, and pharmaceutical ingredients. SI Group supplies customers across chemical manufacturing, pharmaceuticals, fuel and lubricants, oilfield, plastics, rubber, and adhesives sectors, with a stated focus on innovation, safety, chemistry, and sustainability.