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?