This does apply to me, I have a 1099B but no form 3921. I went online to my brokerage and there is no form 3921 available. I received incentive stock over a 15 year period of employment. I am now retired and cashed in some of my stock in 2021. I'm not sure what the 3921 Information is. I'm not sure what my Cost basis is as it is showing as $0(e) on my 1099B. Thank you.
