https://www.cryptoninjas.net/2017/11/13/bitstamp-decides-list-bitcoin-cash-bch/
In May, Bitstamp did a rebranding of the company image and shortly after added Litecoin (LTC) along with adding Ether (ETH) in August as the latest supported crypto-assets. The company will now have support for Bitcoin, Bitcoin Cash, Ripple, Ether, and Litecoin.
In September, Bitstamp distributed corresponding Bitcoin Cash (BCH) balances to their customers who chose to leave their BTC on its platform at the time of the Bitcoin Cash fork event. Users were able to withdraw their BCH funds in a timely fashion. At that time, Bitstamp announced they would be postponing the launch of BCH trading until further notice.