New deals were reached on Wednesday for over 1,000 lay-offs at facilities in Italy, including Melfi, Pomigliano d'Arco and Termoli, both for line workers and other functions, the FIOM union said in a statement, although it has not itself signed the agreements.
The cuts are being driven in part by the transition to cleaner energy in the industry.
A deal has not yet been signed for the Cassino plant, another large Stellantis assembly facility in Italy.
The company has proposed 850 voluntary redundancies for that site, FIOM had said on Tuesday, but a final deal with unions is expected to settle on a lower figure. Another agreement is expected to cover the Atessa van making plant in central Italy.
A spokesman for Stellantis confirmed the new deals signed on Wednesday, under a framework agreed with unions last week.
"They are part of the initiatives implemented by Stellantis to address the effects of the ongoing energy and technology transition process ... including on employment," the spokesman said.
They are on a strictly voluntary basis and mostly aimed at employees close to retirement age or willing to take new professional opportunities, the spokesman reiterated.
Stellantis employs about 43,000 people in Italy, including about 15,000 in the area of Turin, in Italy's north-west, the historic home of Fiat, which merged with Peugeot-maker PSA to create Stellantis.
Voluntary redundancy packages have been the main tool used by Stellantis to cut its workforce in Italy, which amounted to around 55,000 people when the group was formed in early 2021.
The carmaker, which on Wednesday reiterated Italy had a central role to play in its global operations, is in talks with the Italian government on conditions allowing it to boost its annual output in the country to one million vehicles, from about 750,000 last year.
