Here's what well-known exchanges that will not support BCC in an event that their is a fork:
The first bitcoin trading platforms to announce they will not support the BCC hard fork were GDAX and Coinbase. The GDAX exchange is a subset of the Coinbase company, and the August 1 UAHF plans are the same.
Poloniex Leaves the Decision Up in the Air
“Even if two viable blockchains emerge, we may or may not support both and will make such a decision only after we are satisfied that we can safely support either blockchain in an enterprise environment,” explains the U.S. based exchange Poloniex.
Itbit Will Not Support the UAHF Outcome
“Itbit will not support the trading of Bitcoin Cash — If customers want to access Bitcoin Cash immediately following the fork, they should withdraw their Bitcoin to an external wallet address on or before July 31, according to standard cutoffs,” Itbit details.
Bitmex and Exodus Choose to Decline BCC Listing
“As such, Bitmex will not support the split or distribution of Bitcoin Cash, nor will Bitmex be liable for any Bitcoin Cash sent to Bitmex,” the company’s blog explains. “Therefore, it is up to our users to withdraw from Bitmex prior to August 1st if they wish to access Bitcoin Cash tokens or any other hardfork.”
Bitstamp Says BCC is an ‘Altcoin’ and Will Not Support the Protocol
“In the event of a User Activated Hard Fork (UAHF) on 1 August or thereafter, it is important to clarify that Bitstamp would not be in a position to support Bitcoin Cash (BCC), the coin associated with the Bitcoin Cash proposal,”
Source:
https://news.bitcoin.com/fork-watch-these-bitcoin-exchanges-will-not-support-bitcoin-cash/