The volume is the most significant attribute. From my perspective, it exceeds that which might be generated by swing trading retail types. I think there is a systemic increase in institutional interest. I think the long decline tracks the business prospect and the end of the hype cycle on this technology and the beginning of real market penetration. So the knee of the curve is being made as we slowly break into a new up trend. Volume being the most significant confirmation point. This is a long term BUY and HOLD at these levels.
I think there is huge naked exposure from folks who would like for you to sell them your shares, that will make its impact aggressively once we break the resistance in the low .70's.
I doubt that your so-called institutional investors are paying much attention to the garbage seeking alpha is printing. The volumes revolves around the pure speculation that the "social media" is spewing. It will not be long before there is a negative article on SA and drive the price down. Of course Mitch Vine who posting an article on SA years ago and was made to look the complete fool never rescinded. Sooner or later the pumpers will and writers of articles including Bigger will learn, nothing that PLUG management and IR says should be listened to. It is all pump and dump!
The chairman of the board purchased shares at a 25% discount to the open market price. He did NOT show much confidence and actually buy them on the open market. The rest of the shares you speak of were options granted to the management and BOD for being complete failures.