** Shares of Navigator Global Investments NGI.AX rise 5.7% to A$1.86

** Stock eyes best trading session since Feb 19, if gains hold

** The investment manager to acquire minority stake in U.S.-based private firm 1315 Capital LLC

** Acquisition for 23.5% equity stake for consideration $70.5 mln

** Says acquisition broadens co's exposure in private equity markets

** Stock up 8.1% YTD, including current session's moves

(Reporting by Nikita Maria Jino in Bengaluru)

((Nikita.Jino@thomsonreuters.com;))