Bank of America Merrill Lynch, J.P. Morgan, Citi and Wells Fargo have the biggest shares of the corporate market for cash management services, according to the 2010 U.S. Large Corporate Treasury Management Study by Greenwich Associates, the financial services consulting company. The Greenwich survey shows that 73% of large U.S. companies use B of A as a cash management provider either in the U.S. or internationally, while 72% use J.P. Morgan, 58% use Citi and 57% use Wells Fargo.

The survey also shows that companies with annual revenue of less than $2.5 billion increased the number of their cash management banks between 2009 and 2010, while larger companies reduced the number. Greenwich says that reflects smaller companies' thirst for credit and the fact that larger companies, with comfortable cash positions, are focused more on increasing the efficiency of treasury and cash management.