Ford Bridgend job fears: Corbyn calls for assurances
Ford is projecting a reduction of 1,160 workers by 2021, according to a leaked document from the company seen by BBC Wales.
Mass meetings are being held at the company's Bridgend engine plant on Wednesday.
The projection, which would leave 600 workers at the site, is based on the assumption that it is unable to bring any new work in to replace current projects.
Ford would not comment on the document but said it could "fully understand" concern for the longer term.
Labour leader Jeremy Corbyn raised the issue at Prime Minister's Questions, saying the workers needed reassurance about their future.