The transactions seem to originate from address 173ujrhEVGqaZvPHXLqwXiSmPVMo225cqT which had a Total received amount of 56,457.80848111 BTC and a Final Balance of 312.04932734 BTC
Definitely a very big player of some kind.
Well spotted.
Also it looks active, there are daily transactions there.
Probably some exchange?
Well, now it's have total received 64,770.80848111 BTC
And Final Balance 4.72027689 BTC
Since, we mentioned so much about it. The owner move and divide his funds around, not interested to check all of them.
May not look like as exchange, probably just a trader. How lucky they are who had such big amount of bitcoin.