Plug Power (PLUG) reached its all-time intraday and closing stock price high during the height of the dot-com bubble on January 23, 2000, when its shares surged to an all-time peak of approximately $1,565.00 per share (unadjusted for subsequent stock splits). While the company experienced a massive speculative retail renaissance decades later in 2020 and 2021 driven by clean energy enthusiasm, its historical peak from the year 2000 remains its highest valuation milestone ever recorded.