Analysts like JPMorgan break down the risks of the coronavirus to the holding company giants like WPP and Publicis

· Stocks of the five biggest ad holding companies have dropped 20% to 35% as the coronavirus rattles markets around the world.
· Analysts said the largest and most heavily leveraged companies, like WPP and Publicis, and those most exposed in Asia, like Dentsu, are most at risk if advertisers cut spending.
· JPMorgan Chase...