I bought Plug at $8, Bloom at $12 and Ballard at $20 - I'm more than happy so far, even when last Friday was a slight setback. But understandable that after last week some people take out their gains.
Look across American borders - like
https://www.marketscreener.com/quote...L-ASA-1413121/
They are still cheap but there is a good chance that one day they take off like Plug - last 12 months was already +213% and +800% for the last 3 years.