A stock split or stock divide increases the number of shares in a public company. The price is adjusted such that the before and after market capitalization of the company remains the same and dilution does not occur. Options and warrants are included.
Read the SEC filing. PLUG wants to do a reverse split but keep the number of unauthorized shares the same. Reverse splits are never good for shareholders. Especially for a company that has never turned a profit. Loses money on every unit they sell. Has operating cash for only a few more months and has an incompetent management team.