Grab Holdings Inc, the SoftBank Group Corp (OTC: SFTBF) backed Singapore-headquartered ride-hailing company serving eight nations across Southeast Asia, has announced plans to go public in a transaction that will become the largest SPAC merger on record. What Happened: Grab is merging with Altimeter Growth Corp. (NASDAQ: AGC) in a deal that puts Grab at an initial pro-forma equity value of approximately $39.6 billion at a PIPE size of more than.