** Shares of Ventia Services Group VNT.AX rise as much as 9.4% to A$6.06, their highest level since January 22

** Shares post their biggest intraday pct jump since December 13, 2024

** Co logs full-year profit after tax attributable of A$272.2 million ($191.85 million), a 23.6% jump y/y

** To spend additional A$100 million ($70.48 million) on share buybacks

** YTD, VNT shares down 1.8%

($1 = 1.4188 Australian dollars)

(Reporting by Nichiket Sunil in Bengaluru)

((Nichiket.Sunil@thomsonreuters.com))