Maybe Plug is saving up good news and big deals for after the positive Q1 results. By doing this they can spread it over weeks to keep the stock price at a higher level for 30 consecutive trading days.
performance-based stock options up to one-third (1/3) of the shares underlying the performance-based stock option vest and become exercisable on each of the first three anniversaries of the grant date*, provided that the daily volume weighted average price of the Company’s Common Stock during any 30 consecutive trading day period in the three year performance period following the grant date of the stock options (“VWAP”) equals or exceeds certain levels https://d18rn0p25nwr6d.cloudfront.net/CIK-0001093691/99dcad47-039f-44d2-9358-ad64cea0ef54.pdf * grant date 22-9-2021
94 trading days left till 22-09-2023: - September 14 days (15-1 day, Labor Day: Monday, September 4) - August 23 days - July 20 days (21-1 day, Independence Day: Tuesday, July 4) - June 21 days (22-1 day, Juneteenth National Independence Day: Monday, June 19) - May 16 days (17-1 day, Memorial Day: Monday, May 29)