The 500k one is Bittrex cold storage, not sure about the rest though.

EDIT:  I just took a look at the balance history of the Bittrex accounts and it seems that ~1m CRW have been on exchange for over 6 months now.  Looks like one whale has about 400k on exchange and about 750 people have the remainder of the bittrex balance to varying degrees.

Its notable to see that as a percentage of available coins, Crown has fewer coins on exchange than Dash and a few other major projects.