CHICAGO & LONDON--(BUSINESS WIRE)--Northern Trust announced today the successful closing of its acquisition of Aviate Global LLP, an institutional equity brokerage firm offering market research and execution services with offices in London, New York, Hong Kong and Sydney. Northern Trust announced its intention to acquire Aviate on December 2, 2015, subject to applicable regulatory approvals and other customary closing conditions. The new business will be integrated into Northern Trust's existin