Omnicom Group up after beating quarterly revenue estimates

** Shares of advertising and marketing firm Omnicom Group OMC.N rise 2% to $72.02 after the bell

** OMC reports Q2 revenue of $4.02 billion vs estimates of $3.96 billion, according to data compiled by LSEG

** Reports Q2 adj. EPS of $2.05 vs estimates of $2

** OMC down 17.7% YTD