Currently, if participating in Fidelity’s Dividend Reinvestment Program, when you place a sell order for a security in your account that has fractional shares, you enter the whole share quantity only, and your fractional shares are automatically liquidated on settlement date. Your fractional shares receive the same execution price as your whole shares.
After you place your first order in fractions or dollars, any sell order will need to include the whole and fractional share amounts that you want to trade, as fractional shares will no longer automatically liquidate. You will continue to have your dividends reinvested.