German confectioner Storck is considering moving production of Bendicks mint chocolates out of the UK and into its domestic market.
Storck, which also owns brands including Werther’s Originals, said it had started to consult with workers “to determine the future” of its production facility in Winchester.
The company said the sales and marketing department at the site would not be affected.
“Until the consultation is completed, there will be no further announcements,” Storck said.
Union officials said the around 140 staff at the site “face an uncertain future.” Unite regional officer Ian Woodland said: “Yet again, weak labour laws are working against the interests of the UK. Unite will be doing everything possible to protect jobs in a community where unemployment is already too high.”