SoftBank, which invested $250m in the ride sharing service in December, is reportedly among the investors in a series E round being raised at a $1.5bn valuation.

Singapore-based taxi hailing app operator GrabTaxi is set to raise $200m in a series E round featuring internet and telecommunications firm SoftBank, the Wall Street Journal reported on Wednesday.

The round, which will also include investment firms Tiger Global Management and Coatue Management, will value GrabTaxi at $1.5bn, according to undisclosed sources. Coatue is set to lead the round, which could potentially be expanded by additional investment in the coming weeks.

GrabTaxi’s ride sharing service operates in 22 cities across…