The move is explained by a major change in strategy to increase profitability and deal with subdued demand for electric cars.
The group's 14 car brands include Peugeot, Citroën, Fiat, Chrysler, Jeep and Opel.
The details of the new strategy, which comes after competitors such as Ford Motor and General Motors have done so, are to be presented in May.
Among other things, Stellantis will withdraw from a battery company co-owned with South Korea's LG as a partner. When the venture was launched, Stellantis said it would invest tens of billions in battery manufacturing in Windsor, Canada.
