Doubtful it is exchanges all wallets are known and listed as owned after transfers if not before could be institutional but doubht

To compare other major transactions this year in around February/March 3 wallets with $150 million each who never withdrew from 2015 came active and emptyd to exchanges could only be early miners and was the beginning of the major movement this year which leads me to belive the majority of large crypto movements to single wallets are from old mining groups to pump and dump to invest in mining gear for the next few years.

I belive will be heavy retrace possibly $2k drop in day and 40% - 60% drop if not more