0001137091 2026-09-25 2026-09-25 false 0001137091 8-K 2026-09-25 Power Solutions International, Inc. DE 001-35944 33-0963637 201 Mittel Drive Wood Dale IL 60191 (630) 350-9400 false false false false Common Stock, par value $0.001 per share PSIX NASDAQ false