Ballard has far and away the most robust FC stacks for sale today, with lab and real-world testing beyond millions of operational hours.
They also have first class partners and clients, and have reached the inflection point of cashflow positive. IMO we may well see institutions move back into Ballard in the coming months/years.
Back in 2000 it was a $100+ stock, admittedly based on the hype of FC cars being an imminent success. Nevertheless, there is plenty of room for the share price to run now that the company has turned a corner.
I don't own shares anymore right now, but if you're a buy & hold investor, BLDP seems like a very promising long-term investment today.
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