Just realized you were asking what mnav is. Nav stands for net asset value. In this specific instance I believe this is the markup of stock value to bitcoin held, ie add up all shares x price per share (aka market cap) and divide by value of all their bitcoin. I thinks it's around 2.5 now
Discussion
I see why not giving a fuck about that made my life good
Just realized I mighta messed up def. But key thing is MSTR worth 2.5x their btc. Been a real topic of discussion if that's sustainable/rational. I won't rehash here
