Zcash is listed on more than a dozen exchanges, and every one supports deposits from Zcash shielded addresses. Some of these exchanges also give you the ability to withdraw (send) your Zcash to a shielded address where your balance and transaction history are private. This is an important capability, and we recomend using one of these exchanges that offer shielded-by-default capability. There are other factors that will impact your choice of exchange, like location. You can find a list of exhanges that support Zcash here.