Uber's chief executive, Dara Khosrowshahi pledged
Mumtalakat could join other Gulf state funds such as the Public Investment Fund
The move into Japan underscores a recent push by Didi to beef up its presence in markets outside China
His sale is part of a deal struck by a consortium led by SoftBank which is taking a 17.5 per cent stake in Uber
The company is also planning an initial public offering in 2019
WeWork offers warehouse-style shared workspace to smaller companies, primarily tech start-ups
Financial terms of the deal were not disclosed
The fund will help Riyadh obtain access to foreign technology
Improbable raised $502 million from Japan's SoftBank
The tech conglomerate seeks to secure a piece of India's payment systems and online shopping