** SG Fleet SGF.AX rises as much as 24.3% to A$3.320, highest since Oct. 28, 2018
** Mobility solutions provider says it is in talks with Pacific Equity Partners about A$1.19 bln ($777 mln) buyout offer
** Private equity firm to pay A$3.50 per share, a 31.1% premium to SGF's last close
** Stock top gainer on ASX All Ordinaries index .AORD; set for best day since November 2015
** SGF up 19.8% so far this year, as of last close
($1 = A$1.5321)
(Reporting by Himanshi Akhand in Bengaluru)
((Himanshi.Akhand@thomsonreuters.com;))