RE:rules Even if it was Bitfury selling today. it was part of the 6 M they filed for in late Jan. Their latest SEDI filing showed they sold 3M in early Feb so they could sell another 3M to finish that sale.
What looks more likely to me is the market maker is setting HUT up for something huge. I wouldn't be surprised if HUT surged 50% sometime this week.
I'm biased but am trying not to. :)