I think it is retail, someone with $3.1 million to spend. Wish they'd done this when the stock was $3-$4 and established a ridiculously strong base, and I'll bet so do they. I base this on the fact that it's not subtle at all. Institutions and shorts don't telegraph their plays, and there's no reason for MM to spoof bids / asks in a non-eventful after hours. I watch L2 every day and have never seen anything like this during market hours, much less after the market is closed.