$NLOK gained over 8% and is Friday's top performing $SPX #stock; $REGN $DPZ and $MKTX each gained over 5% while $CTXS $CSCO $ALXN $ANET $NVDA $DXCM $CARR $KEYS $ROL $PYPL and $DG all closed up over 4% on the day #trading