Global risk management and brokerage Aon has reported a flat result for the six months to June 30, with total revenue up 2% to $US5.6 billion ($5.3 billion) and net income down 4% to $US484 million ($462 million).

Income from existing businesses fell 3% while investment income was hit by world economic uncertainty and fell 13% for the half and 33% in the June quarter.

Total operating expenses were up 3% to $US4.86 billion ($4.64 billion). A contributor to that was Aon’s April move of its headquarters from Chicago to London.

The risk solutions business grew revenue 1% to $US3.8 billion ($3.63 billion) and recorded operating income up 3% to $US750 million ($717.2 million).

The human resources solutions business saw revenues up 3% to $US1.87 billion, but operating income slide 26% to $US131 million ($125.2 million).

Restructuring savings at Aon Benfield contributed $US34 million ($32.5 million) during the first three months and while $US14 million ($13.3 million) in the second quarter.

The risk business expanded during the half-year, with the completion of the acquisition of ABN Amro’s commercial insurance unit.