BBDO will handle Wrigley brands in Thailand, Malaysia, Indonesia and the Philippines. But, after a pitch with DDB, the agencies will share the account in Vietnam.
A pitch also saw the account split in mainland China, while DDB was also given a share of the business in Hong Kong and Taiwan, without a pitch.
DDB holds to the account in Australia and New Zealand.
Casualties from the review are former Asia incumbents Grey and Leo Burnett.
The account is dormant in Singapore, where chewing gum is banned.
A Wrigley spokesman confirmed the news.