The owner of creative agencies TBWA and DDB, and media networks OMD and PHD, posted second-quarter profits of $243.3m (£158.9m), up from $233.4m (£152.6m) the previous year.
Results were boosted by new business wins including General Motors (Chevrolet), Kraft and healthcare brand, Humana.
In a call with analysts, Wren said economic growth was "improving, although slowly". He said Omnicom was now beginning to see "increases in the scope of services [clients] require... Last year the focus was survival, this year it's growth".
Worldwide revenue at the group increased 5.9% to $3.04bn, up from $2.87bn in the second quarter of 2009.
Domestic revenue increased 7.4% to $1.63bn, and international revenue rose 4.3% to $1.4bn.
The results feed the mood of general optimism in the growth of the advertising market, compared to the downturn experienced last year.
Earlier this week, rival media network during 2010, and stated it was not expecting a "double-dip" recession, but was "still cautious" about the market.
Prior to that prediction, Sir Martin Sorrell's .
The only results to indicate a downturn over the coming months were released as part of the "industry barometer" during 2010.
Its findings suggested that in the UK during the second quarter of the year, total marketing spend fell by 4.6%, against a 4.5% rise in the first quarter.
Picture credit: Nigel Parry
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