The content originally appeared on: CNN The Singaporean startup closed down nearly 21% Thursday as it began trading on New York's Nasdaq. Grab went public by merging with a special-purpose acquisition company, or SPAC. The deal - in which Grab raised $4.5 billion, and was valued at nearly $40 billion - was the biggest of its kind on record, according to data provider Dealogic. It's also the largest US market debut by a Southeast Asian company. The previous record was […]