Thanks for your responses and being patient with me. I appreciate it.

Perhaps this is an NSO. The documentation online had info about both ISO and NSO. Maybe because some other employees had ISOs? This is probably just my inexperience with the topic. Thank you for the help.

Because the cost basis I paid for the shares was significantly below the FMV at the time, the difference in cost was considered as additional income from my employer. Thus, I paid 22% in supplemental income tax at the time of purchase.