Tenneco Clean Air: Stock Debuts With Over 27% Premium on Listing Day

Tenneco Clean Air made headlines on its listing day on 18 November 2025, when the stock jumped more than 27% above its issue price. This strong debut surprised many market watchers. It also showed how fast investors are shifting toward clean-mobility and emission-control companies. The demand for cleaner engines, lower emissions, and strict global rules has pushed this sector into the spotlight.