Investors are clearly bullish about former Salesforce co-CEO Bret Taylor’s AI agent startup Sierra.

Sierra, which helps enterprises build customer service AI agents, announced it raised a $350 million funding round on Thursday. The round, led by earlier investor Greenoaks Capital, values the startup at $10 billion, according to a company blog post that confirmed an earlier report from Axios on Wednesday.

Sierra was founded in early 2024 by Taylor and longtime Google alum Clay Bavor. The company claims to have landed hundreds of customers, including SoFi, Ramp, and Brex, among others, in its 18 months of operation.

Sierra has now raised $635 million altogether, including a $110 million that closed in February of last year led by Sequoia and Benchmark, and a $175 million round tha

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