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 rel=”nofollow” href=”https://sierra.ai/blog/theres-an-agent-for-that-and-it-runs-on-sierra”>$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 rel=”nofollow” href=”https://www.axios.com/2025/09/03/sierra-ai-agents-funding-350-million”>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,…

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