Stellantis, the carmaker which owns the Jeep, Peugeot and Fiat brands, said Thursday that its sales fell 27 percent in the third quarter because of market difficulties in North America. Stellantis -- which has a vast stable of 15 car brands -- has hit a rough patch after years of record profits after its foundation in 2021 with the merger of PSA (Peugeot-Citroen) and FCA (Fiat-Chrysler).