Interpublic reported second-quarter revenue of $1.65bn, compared with $1.53bn for the same period a year ago, with first-half 2007 revenue of $3.01bn compared with $2.86bn last time.
Second-quarter net income was $137m, up from $65.7m in 2006.
The results are an improvement on the last quarter, in which the company posted a loss of $132.8m on revenues of $1.36bn, and organic growth of 1.6%
The company, which was boosted by the Martin Agency winning the $570m Wal-Mart creative account and DraftFCB winning the $280m Kmart creative account, beat analysts' expectations.
Its share price jumped 9.8% on the New York Stock Exchange to $10.71.
The good news was reinforced by a quarterly organic growth rate of a respectable 6.6%.
Michael Roth, chairman and CEO and of Interpublic, said: "The second quarter saw Interpublic perform at the highest level in many years. These results are encouraging and should serve to validate our belief that we have the company on the right track.
"Improved organic growth demonstrates that our focus on attracting and developing talent, as well as strategically realigning our capabilities, is paying dividends in the marketplace. We have also shown progress in improving profitability.
"The quarter is a testament to the real potential of our company. We continue to drive the organisation toward achieving our 2008 goals, although recent client reversals and the accelerating pace of change in our industry represent additional challenges that we must overcome in order to achieve those targets."
However, Roth cautioned investors about "using the second quarter's very strong results to extrapolate results for the rest of the year".
Interpublic has recently lost the creative duties for Buick and Pontiac in the US and the European media account for Johnson & Johnson, as well as creative on some J&J brands in the US.