A car components plant has told its 160 staff that a 90-day consultation period has begun over the future of the plant.
The Llanelli-based plant once employed more than 1,000 people
Krupp Camford Pressings in Llanelli said it would be looking into whether it would be more cost-effective to relocate elsewhere.
But the German-owned components plant, which once employed more than 1,000, said no changes would happen until well into next year.
In 1999, workers took a pay cut to save 900 jobs.
In September 2004, managers at the plant gave what was described as a final chance to the workforce, with a three-month deadline, to either make the plant profitable or face its closure.
In 2005, the firm let 60 temporary staff go in the wake of the crisis at MG Rover, one of the companies which it supplied.
Helen Mary Jones, Plaid Cymru AM for Mid and West Wales, said the latest announcement was "very bad news" for Krupp staff.
"People working at the plant have been concerned for a long time since it was bought out in 1999.
"It's so unfair because the workforce have done so much to increase their flexibility. It must be gutting for them."
She added that she thought it was easier to make people redundant in the UK than in the parent company's country.
Catherine Thomas, Labour AM for Llanelli, said she was "very concerned" at the announcement.
"I have spoken with senior shop stewards and I am meeting with them and management tomorrow to assess the situation and discuss how best we can proceed," she said.
"Whilst the announcement is indeed of great concern it's vital to stress that a final decision is yet to be taken.
"What we must do now is work together, along with the Welsh Assembly Government, to ensure everything is done to safe guard these jobs."