Cypher had quite broad support, looking at Block Explorer.

Wallet (most likely an Exchange)
FMHo9uxygS3GvrrXqdDRBRMrdAduR48NEW
14 Deposit addresses.

Wallet (most likely an Exchange)
FLjsq2PkJ8o89aBxRhHjG1cnwoR4HJTJoi
85 Deposit addresses.

Wallet (most likely an Exchange)
FMsSncGoRGyYNCxtzoShUwG4npKSjeizsJ
17 Deposit addresses.

Wallet (most likely an Exchange)
FNuZvJ7eQCCtVgLnCncm3LZMib7v2QnFME
30 Deposit addresses.

Wallet (most likely an Exchange)
FPZNv2MLSyGhT3k5nF2GTQ2xT4UWzmvbyX
57 Deposit addresses.

Though, the information is 3 weeks old, it appears you have Bittrex, CEX, Yobit, Cryptsy and AlcurEX all covered.

When BlockExpert, finally finishes their migration, investors will be able to see in real time how much Cypher is on the exchanges.

Incidentally, if anyone has the technical expertise to set up temporary Block Explorer, it would be very much appreciated.