Neither of these are still cars-to-trucks companies, they just share a brand.
Mercedes-Benz (cars and light commercial vehicles) spun out its heavy commercial vehicle business in 2021.
Volvo Group (heavy commercial vehicles, marine, industrial) sold its car operation to Ford in 1999, which then sold it to Geely in 2010.
Before them Rolls-Royce (aerospace, gas turbines, marine, nuclear) spun out its car business in 1973.