In your example you stated that you only sold 250 shares for taxes. Yet your screenshot indicates that you sold 1,000 shares. Did you copy these figures from an actual 1099-B?
Also, your per-share cost basis is the compensation you received at vesting (which is reported on your W-2) divided by the gross number of shares you received, including those sold for taxes.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
