Investors & landlords

Hi Tom, thanks for your response. I am still little confuse. Let me give you exact scenario to explain my question please . I had 7 stocks vested last year (at zero cost to me) on 5th march at a market value of $201 (total of $1407). After two days, my employer sold 4 stocks at a rate of $197.60 to cover taxes. Now I have 3 stocks left which I have not sold yet. what would be my cost basis in that case? Also what will be my date of acquired and date of sell? I am sorry I am new to RSUs and very thankful to your help.