Supreme Petrochem Ltd. was established in 1995 as a joint venture between Supreme Industries Ltd., India's largest plastics processor, and R. Raheja Investments Pvt. Ltd. Supreme Industries Ltd., founded in 1942, has maintained its reputation over the years due to its strong core values. Despite starting with a small polystyrene plant, Supreme Petrochem Ltd. quickly rose to become the top polystyrene producer in India within a short period, capturing over 50% of the market share.