Stellantis confirmed on Thursday 16 April 2026 the end of car assembly at its Poissy plant (Yvelines department, west of Paris) by the end of 2028. The announcement, made during the plant's works council meeting, closes a suspense of several months: the Paris region will soon lose its last remaining car-assembly plant. The site, opened in 1937 by Ford, later Simca's main factory before PSA took it over in the late 1970s (when it employed nearly 27,000 workers), today assembles the Opel Mokka and DS 3. Output — just under 90,000 vehicles in 2025 — is expected to drop to around 60,000 this year.

The plant will not close. Stellantis is committing around €100mn to convert it into a hub dedicated to "the different lives of vehicles": producing spare parts for its other French sites (notably Hordain in the North, where the group builds its light commercial vehicles) and for the aftermarket. The plan includes €20mn to modernise the stamping shop with a new-generation press, a new engine line transferred from Vesoul (Haute-Saône) starting this autumn, a new paint shop, a vehicle-deconstruction line (salvaging viable parts for the aftermarket), and a 3D-printing capability. The existing Green Campus (R&D, support functions, Stellantis France HQ) remains in place.

On employment, management is counting on natural attrition. The industrial headcount will fall from 1,800 workers today (1,500 of them genuinely operational) to 1,200 by 2030, without a social plan. Part of the €100mn budget will fund retraining. The majority union CFE-CGC welcomed "an important first step". The decision — echoing Renault's conversion of Flins — only partly addresses Stellantis's European overcapacity problem: most of its plants are running well below capacity, and Bloomberg has reported discussions with Chinese carmakers to use some lines. The May strategic plan will be closely watched. Source: Les Echos, 16 April 2026, Yann Duvert.