I exercised my nonqualified stock options when I left my previous employer in 2015. The company later sold and I received a distribution in 2018. I was able to calculate my cost basis to determine the capital gains taxes owed for 2018.
In 2019 I received a much smaller supplementary distribution as there were a few post-closing tax benefit payments owed to the stockholders. I have a 1099-B for this, but am unsure as to how to enter it in.
I know the proceeds, but what do I enter for the date acquired, cost basis, etc?