About 200 jobs are to go in a Worcestershire town at the defence and security firm Qinetiq, a union claims.
The firm, which has a site off Poolbrook Road, Malvern, said 400 people were expected to be made redundant across the UK.
The Prospect union claimed about half would be going at Malvern and said it wanted to achieve cuts voluntarily.
But Qinetiq has disputed the claims saying "no particular site is earmarked" for the proposed job losses.
In a statement, it said: "Qinetiq is undergoing a restructuring of its UK business that involves redundancies of up to 400 people.
"Job roles are being looked at rather than particular sites."
National secretary of Prospect, David Luxton, added: "The steps that Prospect are taking we believe will help us minimise compulsory redundancies."