Carlson Marketing Group will work primarily on the £1m Stella Artois business, which was previously handled by Boy Meets Girl S&J.
The Marketing Store will oversee the Castlemaine XXXX business; Vitamin V will handle speciality beers ales and stouts; and Stand will work on Tennent's.
The roster will handle all the brewer's below-the-line activity except point-of-sale, manufacturing, PR and sponsorship.
Interbrew previously used 10 agencies across its beer business. Creative agencies Bartle Bogle Hegarty and Lowe are unaffected.
If you have an opinion on this or any other issue raised on Brand Republic, join the debate in the Forum here.