Grab declined to comment on the SPAC deal.
There was no response from Silicon Valley-based Altimeter, Fidelity and Janus Henderson to emailed requests seeking comment.
The sources declined to be identified due to the sensitivity of the matter.
The deal for Grab, which was valued at just over $16 billion last year, will be a big win for its early backers such as SoftBank Group Corp and China's Didi Chuxing.
Last year, Mitsubishi UFJ Financial Group Inc and IT services firm TIS Inc invested $856 million in Grab as it expanded into financial services.
The bumper valuation validates Grab's co-founder Anthony Tan's strategy to aggressively tap growth in new sectors and ramp up market share by pumping billions of dollars to localise its services and invest in high-growth economies.
"Institutional investors looking for Asian consumer internet exposure are keen to diversify their allocation beyond a handful of companies," said Varun Mittal, head of emerging markets fintech business at consultancy EY.
Grab attracted global attention in 2018 when it acquired Uber's Southeast Asia business after a costly five-year battle and in return took a stake in the company.
Reuters reported in January that Grab, which has so far raised about $12 billion, was exploring a U.S. listing. [L1N2JT0HC]
Grab's agreed transaction will surpass electric vehicle maker Lucid Motors' $24 billion deal struck with a SPAC in February. [L4N2KS4YJ]
With operations in eight countries and 398 cities, Grab is already Southeast Asia's most valuable start-up.
Leveraging its ride-hailing business started in 2012, the firm has moved into food and grocery deliveries, courier services, digital payments, and is now making a push into insurance and lending in a region of 650 million people.
The listing will give Grab extra firepower in its main market, Indonesia, where local rival Gojek is close to sealing a merger with the country's leading e-commerce business Tokopedia.
Grab, whose net revenue surged 70% last year, is yet to turn profitable, but it expects its biggest segment - the food delivery business - to break even by end-2021, as more consumers shift to online food delivery after the COVID-19 pandemic.
Cash-rich, U.S.-listed Sea is also muscling into food delivery and financial services in Indonesia. Both Grab and Sea won digital bank licences in Singapore last year.
(Reporting by Anshuman Daga; Editing by Muralikumar Anantharaman and Mike Harrison)
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