The known EMS leader, Foxconn (after iSuppli) is going to control over 50% of the market already in 2011. With revenues (Q1 2010) of $17,1b is almost 3 times bigger than the next EMS Flextronics, which in turn is twice as big as its 3rd place holder Jabil Cirquit.
With Apple iPad contracting is Foxconn not sole leader in the market.