** Shares of Plenti Group PLT.AX rise as much as 14.7% to A$1.44, their highest level since October 31
** Fintech lender and investment co heading for best day since late January 2025, if current gains hold
** Co's HY cash NPAT more than doubles to A$12.8 million ($8.31 million); revenue rises 20%
** Says on track to achieve its objective of A$3 billion loan portfolio by March 2026
** Stock has more than doubled in value so far this year
($1 = 1.5401 Australian dollars)
(Reporting by John Biju in Bengaluru)
((John.Biju@thomsonreuters.com;))