BUZZ-Sophos: best day ever after positive trading update
** Cloud services and network security provider Sophos shares up 18.5 pct; top of FTSE Mid Cap Index
** Anticipates FY reported billings growth towards top end of previously guided range of 20-22 pct growth
** Q4 reported billings growth of about 23 pct
** Says year to end March saw strong growth, putting it on course to deliver its goal of annual billings of $1 bln for FY 2020
** Shares (Berlin: DI6.BE - news) records biggest ever single day percentage gain