Sierra
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Investors
Founders
About
Sierra is a conversational AI platform for enterprises, founded in 2023 by Bret Taylor and Clay Bavor 1. Taylor previously served as Co-CEO of Salesforce, co-created Google Maps, was CTO of Facebook, and founded Quip (acquired by Salesforce for $750M) 16. Bavor spent 18 years at Google, most recently leading Google Labs, and previously led Google’s AR/VR efforts and Google Lens 6. The two met while working together at Google in 2005 1.
Sierra builds AI agents that handle customer service interactions for enterprises, using a “constellation” of large language models from OpenAI, Anthropic, and Meta 3. The company launched in February 2024 and reached $100M ARR within seven quarters 5. Enterprise customers include WeightWatchers, SiriusXM, Sonos, ADT, Ramp, SoFi, Rivian, Deliveroo, Discord, and Wayfair 35. Over 50% of Sierra’s customers have revenue exceeding $1B, and 20% exceed $10B 5. The company has offices in San Francisco, New York, London, Atlanta, Singapore, Tokyo, Paris, Madrid, and Toronto 6.
Funding History
| Date | Round | Amount | Lead | Co-investors |
|---|---|---|---|---|
| Feb 2024 | Seed | $110M | Sequoia Capital, Benchmark | — |
| Oct 2024 | Series B | $175M | Greenoaks Capital | Thrive Capital, ICONIQ |
| Sep 2025 | Series C | $350M | Greenoaks Capital | — |
Total raised: $635M 4. Valuations: ~$1B (Seed), $4.5B (Series B), $10B (Series C) 124.
What Investors Say
Sequoia’s Ravi Gupta, a Sierra board member, said the $110M seed round gives the startup the chance “to always be on offense” 1.
What Founders Say
Bret Taylor on Sierra’s mission: “The greatest opportunity we have is to enable every company, no matter how sophisticated or technical, to deploy [AI] successfully” 1.
Clay Bavor on the market opportunity: “In 1995, if you wanted to exist digitally, you needed a website. Ten years ago, you needed a mobile app. Now, you need an AI agent” 7.
Taylor and Bavor on founding Sierra: “Starting Sierra was an early bet that AI agents would transform the enterprise software industry” 8.
On reaching $100M ARR: “Credit goes to our amazing team, who’ve worked their tails off to build the business, and to our growing band of customers — the real pioneers of applied AI” 5.
Sources
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Fortune, “Exclusive: Ex-Salesforce Co-CEO Bret Taylor launches AI startup Sierra,” February 13, 2024. https://fortune.com/2024/02/13/bret-taylor-clay-bavor-ai-startup-sierra-110-million-funding-sequoia-benchmark/↩↩↩↩↩↩
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CNBC, “Bret Taylor’s AI startup Sierra raises funding at $4.5 billion valuation,” October 28, 2024. https://www.cnbc.com/2024/10/28/bret-taylors-ai-startup-sierra-valued-at-4point5-billion-in-funding.html↩
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SiliconANGLE, “Sierra AI raises $175M at $4.5B valuation,” October 28, 2024. https://siliconangle.com/2024/10/28/generative-ai-agent-startup-sierra-technologies-raises-175m-4-5b-valuation/↩↩
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TechCrunch, “Bret Taylor’s Sierra raises $350M at a $10B valuation,” September 4, 2025. https://techcrunch.com/2025/09/04/bret-taylors-sierra-raises-350m-at-a-10b-valuation/↩↩
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Sierra blog, “Sierra hits $100M ARR milestone in 7 quarters,” November 2025. https://sierra.ai/blog/100m-arr↩↩↩↩
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Sierra, “About Sierra,” accessed March 2026. https://sierra.ai/about↩↩↩
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Salesforce Ben, “Bret Taylor’s AI Company Sierra Raises $350M Capital at $10B Valuation,” September 2025. https://www.salesforceben.com/bret-taylors-ai-company-sierra-raises-350m-capital-at-10b-valuation/↩
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Sierra blog, “There’s an agent for that, and it runs on Sierra,” September 2025. https://sierra.ai/blog/theres-an-agent-for-that-and-it-runs-on-sierra↩