I can't say for sure,but Fuel cell stocks are on a tear,so maybe CPST gets caught up with them. Alternate power?
I even paid up in the pre market (not my usual style). Probably because I was aware of the fuel cell stampede earlier the last few days and I resisted getting on board. Like I posted in a earlier post just bite the bullet and if it bites back pull it out, if you do you survive for another day, but if you don't not so good. LOL