The merger of the two agencies into Berkshire-based Reaction aims to help manage costs, according to business development director Simon Payne.
"As budgets get tighter but client expectations continue to rise we must find new ways to reduce costs yet remain innovative and exciting," said Payne. "Reaction aims to achieve this using our combined 18 years’ experience, developing closer relationships with clients and suppliers, plus utilising new developments in technology."
The new business comprises five in-house staff, as well as freelance events employees as required.
Clients include EDF, Sky Broadband and Barclays, and the company is led by directors Payne, Ralph King and Paul Moynihan.
Reaction sales and marketing director Moynihan added: "The two companies - Mind Adrenaline and WS Teams - have been working successfully together since January 2012.
"We feel that now is the time to formally integrate our resources."