Well according to this report in First Post they do, which is pretty staggering if it’s true.
The report is actually about WPP’s decision to outsource up to 100 North America back office job to India as it tries to save staff costs (a process dressed up as ‘efficiencies’).
This line-up leaves out Havas, Dentsu, Aegis and smaller rivals like MDC Partners so it should maybe be taken with a pinch of salt. It may also be treating Indian firms in which the Western biggies own a stake as wholly-owned.
Anyway if it’s even close to the truth it’s a big share of the market and one the rather prickly Indian government might be alarmed at. A new form of colonisation in effect.