Definitely looks planned to me, no way people are dropping 200K at a time while there is a buyer there in place. Much more likely that its some preplanned loading IMO and generally speaking the more the merrier.
Lets see a 750K+ vol day. Hopefully means we see some actual serious upside volume when this starts moving. no more of the 100K max buy side days, we need, 200,300,400,500K+ buyside days