The Seattle catering company DSquared Hospitality laid off 83 employees, more than a quarter of its workforce, after losing key contracts to global service providers.

Just days before Christmas, 62 full-time and 21 part-time employees will lose their jobs. The cuts come after T-Mobile and Benaroya Hall, the downtown Seattle home of the Seattle Symphony, said they wouldn’t renew their contracts with DSquared.

It’s been a challenging period for the three siblings who run the catering company their parents started in 1986.

“To lose your job on Dec. 20? That’s the worst thing in the world,” said Reed Haggerty, DSquared Hospitality chief operations officer and co-owner. “There are so many incredible people that work over at T-Mobile.”

For years, DSquared Hospitality had fixed presences in Bellevue-based T-Mobile’s corporate office and Benaroya Hall, working from kitchens to serve daily meals to T-Mobile employees and offer food for purchase to guests attending performances at Benaroya Hall.…