Do I need to file Form 3921 even if I didn't sell?

Hi, I exercised stock options in 2021. I received form 3921, but I never actually sold any of the options. Do I need to add this information in when filing my taxes? If I add it in, I have an additional $2000 due, which seems like a lot. Not sure if I only need to add this info in if I end up selling a portion of my stocks.