All the major exchanges.
More importantly, fiat exchanges close the doors on new investors.
bitstamp,bitfinex(10000usd input to have an active account),bittrex,cex etc almost everyone is down/closed for new people.
And you expect the price to be high?
No new money in the market all the exchanges basically manipulating everything.

My advise donot sell your bits they want you to loose.Buy if you can