Manchester United shirts Aon was unveiled as the sponsor of Manchester United in July 2010
US insurance group Aon has said it plans to move its corporate headquarters from Chicago to London.
"The move provides greater access to emerging markets and takes better advantage of the strategic proximity to Lloyd's," the insurer said.
The move, subject to shareholder approval, is expected to happen in the second quarter. Chicago will remain the main office for the Americas.
Aon is the main shirt sponsor for Manchester United football club.
At the same time, Aon will change its legal jurisdiction of incorporation from Delaware - a state in the US where many companies are based for disclosure purposes - to England.
"The decisions we make today will help drive our global strategy and strengthen our growth opportunities in the years to come," said Aon chief executive Greg Case.
The move will not cause job losses in either Chicago or the US, the insurer said.
Aon plans to add more than 1,000 positions across its US operations in 2012, based on continued growth and investment opportunities.