First-quarter revenue at Marsh McLennan rose 9% to $US7.1 billion ($11.1 billion). 

Underlying revenue growth was 4% from a year earlier.  

Operating income was $US2 billion ($3.1 billion), and net income fell 1% to $US1.4 billion ($2.2 billion). 

"We had a solid start to the year,” president and CEO John Doyle said. "Marsh McLennan is a resilient business built to deliver across market cycles. Clients value our advice and solutions, particularly in uncertain times." 

Marsh's revenue rose 15% to $US3.5 billion ($5.5 billion), though Asia-Pacific revenue slipped slightly to $US335 million ($528 million AUD), from $US336 million a year earlier.  

Guy Carpenter's first-quarter revenue rose 5% to $US1.2 billion ($1.9 billion), while consulting revenue also rose 5%, to $US2.3 billion ($3.6 billion). 

Risk & Insurance Services revenue rose 11% to $US4.8 billion ($7.5 billion), while operating income was $US1.6 billion ($2.5 billion).  

Mercer's revenue was $US1.5 billion ($2.3 billion) and Oliver Wyman’s revenue was $US818 million ($1.3 billion).