** U.S.-listed shares of Singaporean technology company Grab Holdings' GRAB.O rise 6.7% to $5.93 premarket
** Co announces investment in Berlin-based Vay Technology, which develops remote driving tech and related mobility services
** GRAB to initially invest $60 mln, plus $350 mln if milestones met post-closing
** Up to last close, stock has risen 17.8% this year
(Reporting by Anhata Rooprai in Bengaluru)
((Anhata.Rooprai@thomsonreuters.com))