Scale AI Backer Accel Set for $2.5 Billion Windfall on Meta Deal

A handful of venture capital firms are set to see huge returns from their early bets on Scale AI, following Meta Platforms Inc.’s $14.3 billion mega investment in the artificial intelligence startup.

The biggest winner is Accel, one of Silicon Valley’s oldest venture firms, which first backed Scale almost a decade ago, when the startup’s chief executive officer was still a teenager. Accel expects a windfall of more than $2.5 billion, according to a person familiar with the matter who asked not to be identified discussing private information. Accel declined to comment on the investment.

With the financing, Meta is set to take a stake of ...