** Shares of advertising and marketing conglomerate Omnicom Group OMC.N fall 3.64% to $74.03 after the bell

** OMC reports Q1 revenue of $3.69 billion, missing analysts' estimates of $3.72 billion, according to data compiled by LSEG

** Omnicom reports adj. EPS of $1.70 in Q1, vs estimates of $1.62 per share

** "We are assessing the implications of economic and market events to determine how they will affect our clients and business for the remainder of 2025" - CEO John Wren

** Up to Tuesday's close, stock down 10.7% YTD

(Reporting by Juby Babu in Mexico City)

((Juby.Babu@thomsonreuters.com;))