How many days will it take for the cheque to clear? http://ampland.fun/ amp land Other major providers of private exchanges include Mercer, adivision of Marsh & McLennan Companies Inc, and TowersWatson & Co. Mercer said this summer that it had fivemajor employers enrolled but did not name them. Towers Watson isin the process of launching an exchange. Smaller companies, likeBuck Consultants, Willis North America Inc andregional players, are also starting exchanges.