Insurance broker Aon Corp. has reported a net income of $277m, or $0.82 diluted earnings per share, for the fourth quarter of 2011, compared to $231m, or $0.67 diluted earnings per share, for the same period in 2010.

The total revenue for the fourth quarter of 2011 rose 3% to $2.99bn, compared to $2.90bn for the same period a year ago, driven primarily by a 3% increase in organic revenue.

Operating income was $435m, up 3%, compared to $422m for the same period in the previous year.

Aon president and CEO Greg Case said that the company’s fourth quarter results reflect 15 percent growth in earnings as highlighted by organic growth across all major businesses and the continued delivery of synergy savings related to Aon Hewitt.

In January 2012, Aon revealed plans to relocate its corporate headquarters from Chicago to London, as part of its global growth strategy as well as to gain greater access to emerging markets.