I am a US citizen who has never lived inside the US. I was born in Belgium and lived there all my life.
This year I became aware of my obligations to declare taxes in the US. Because of this, I went through the IRS Streamlined Filing Compliance Procedure. I filed the last 3 years of 1040s and 6 years of FBARS. It seems like everything went through correctly and was accepted.
However, at the very end of 2018 I converted part of the stock options from the company I work for into actual stocks. A small part I cashed out. For this I had to fill in the W9 IRS form for my employer. I did not mention any of this (existence of the stocks, nor the W9 form) when filing my taxes.
Now I'm not sure if this was correct. Should I have mentioned that I own stock in the company I work for? Should I have mentioned the small amount of money I made off the stock options? If so, is there anything I can do now to resolve this?