Business caterer Eurest has struck a £30m deal with accounting and consultancy firm KPMG to cater at all its 34 offices in the UK for the next four years.
Eurest, part of the Compass Group, will manage staff restaurants, meeting rooms and hospitality.
The company already runs staff dining at more than half of KPMG's offices. It will now cater for more than 11,000 staff in locations ranging from Aberdeen to Plymouth, Manchester, Leeds and London.
Some sites have up to 1,600 staff, while others have as few as 50
The contract will turn over about £30m a year.
KPMG said it was looking for consistency in its staff catering.