U.S. polystyrene prices rose through mid-May 2026 as strong domestic production, rising feedstock costs, and global disruptions supported a continued uptrend. Domestic suppliers met of demand, keeping supply steady and exports to Latin America flowing despite global instability. High Gulf Coast operating rates kept polystyrene availability healthy, but volatile benzene and styrene costs—driven by crude disruptions from the Middle East conflict—pushed prices higher. Global petrochemical prices have surged nearly 50%, contributing to rising U.S. inflation. With crude flows restricted and freight and insurance costs elevated, polystyrene markets face ongoing volatility. Prices are expected to remain firm through late May, though short-term fluctuations are possible.
