SoftBank to invest $250 million in SE Asian taxi app firm GrabTaxi

A man holding an umbrella walks past the logo of Softbank Corp at its branch in Tokyo April 22, 2014. REUTERS/Yuya Shino

TOKYO (Reuters) - Japanese mobile carrier SoftBank Corp said on Thursday it will invest $250 million in GrabTaxi, the largest mobile taxi booking app firm in Southeast Asia, to become its largest shareholder. (Reporting by Edwina Gibbs; Editing by Chris Gallagher)