If your LTIP is similar to RSUs, then the remaining 300 shares should have already been included in the wage amount on your W-2 in an amount equal to their value on the day the shares vested. Given that your company sold 200 shares to cover their tax withholding obligations implies that the value of the remaining 300 shares has already been included on your W-2. If the value of the remaining 300 shares has not been included on your W-2, then yes, report that value on your tax return. But its worthwhile to confirm with your company before including the value of the 300 shares on your tax return because you don't want to pay tax twice on the same value.
Do you have an amount in Box 14 on your W-2? Companies will use Box 14 to include the value of, among other things, RSUs vested with employees. If there is an amount in Box 14, typically the amount in Box 14 has already been included in Box 1 Wages on the W-2.
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