Bitstamp, currently the fourth biggest bitcoin exchange with trading volumes of around $30 million, hast stated they will not support Bitcoin Cash.
If Bitstamp chooses to list BCC, we would decide at our own discretion on what course of action to take with balances deriving from the hard fork, they say, before adding that Bitstamp is not in a position to support BCC, nor will Bitstamp be liable for any BCC sent to Bitstamp.
http://www.trustnodes.com/2017/07/27/bitstamp-comes-bitcoin-cash