• StatusActive
  • StrategyFlagship

SI Group


SI Group is a leading global developer and manufacturer of performance additives and intermediates, with strong market positions in the plastics, oilfield, rubber, fuels & lubricants, active pharmaceutical ingredients and industrial resins industries. Headquartered in the Woodlands, Texas, SI Group operates 30 manufacturing facilities on five continents with approximately $2 billion in annual sales, and over 2,700 employees worldwide.

SK Capital acquired SI Group in October 2018 and merged it with Addivant, a leading global producer of specialty additives and an SK Capital portfolio company since 2013. The combined Company is marketed under the SI Group brand.