Bret Taylor’s AI Agent Startup Nears Deal That Could Value It at Over $4 Billion

Sierra, an artificial intelligence startup co-founded by former Salesforce co-CEO Bret Taylor, is raising hundreds of millions of dollars in new funding led by growth-stage investor Greenoaks Capital, according to two people who have knowledge of the deal.

The new financing will at least triple the company’s valuation, which was $1 billion in a funding round in January, one of the people said, adding they expected the valuation to surpass $4 billion. It’s the latest sign of the high prices investment firms have been willing to pay for shares in young AI firms with little revenue, particularly those led by Silicon Valley veterans.