I've been wrecking myself doing fund raisers and pitching in iXcoins myself and all along some rich a-hole (or a hedge fund or bank) with millions of iXcoins has been sitting around just laughing at us.
Those addresses look like an exchange or pools hot/cold wallet - with shuffling funds around to prevent fragmentation.
It's probably vircurex since it was the earliest exchange for iXcoin. Cryptsy didn't open until May 20th, 2013, and iXcoin would have been listed even later. But of course an exchange doesn't actually own all the coins. The coins likely belonged to dozens or hundreds of different customers.