Plug Power Inc. (NASDAQ:PLUG) is one of the best low cost stocks to buy under $5. On March 2, Plug Power announced the earnings report for 2025, where the company made $710 million in total revenue, marking a 12.9% year-over-year increase. Most notably, the company reached a positive gross margin in Q4 2025, which was a recovery from a 122.5% margin loss in the same period the previous year. This improvement was driven by ‘Project Quantum Leap,’ which is a strategic initiative focused on price increases, m ...