BC −1.4%. Cummins +22.1%, Westport Fuel Systems −19.3%, BWX Technologies −27.7%, Power Solutions International −51.4%. Weekly closes, Oct 3, 2025 = 100, log scale.

End-of-day closes (Databento EOD), the last close of each week. The four peers are the largest US-listed companies by market value in BC’s SEC industry (Engines & Turbines) with a year of closes. It shows what the closes did; a move here is not a cause, a forecast or a call.