Why did you come to ? http://keandra.in.net/ keandra.com While hundreds of banks participate in the foreign exchange market, four players dominate, with a combined share of more than 50 percent, according to a May survey by Euromoney Institutional Investor. Germany's Deutsche Bank is No. 1, with a 15 percent share, followed by Citigroup with 14.9 percent, Britain's Barclays with 10 percent and UBS with 10 percent.