Sierra
Sierra is an AI agents company based in San Francisco, United States, founded in 2023. AI customer-service agents for enterprises. It was valued at $15.8bn on 4 May 2026 (Series E funding round ($950m)), which makes it a decacorn in the 311 Unicorn Index.
Part of the 311 Unicorn Index (311institute.com). Last updated .
Source: TechCrunch; CNBC for the $15.8bn figure
About Sierra
AI customer-service agents for enterprises. Lead investors in its latest round: Tiger Global, GV. Website: sierra.ai.
How this figure is calculated
The valuation set by the latest priced funding round or company-run share sale, as announced by the company or its lead investor, or reported by a major news organisation. Figures in other currencies are converted at the rate on the day of the round. Talks that have been reported but not closed do not count.
Related
- Innovation profile of San Francisco
- United States: economy and key statistics
- The 311 Unicorn Index
- Global Startups Directory
- Global Investors Directory
- All 311 Indexes
Other unicorns in United States
- Anthropic ($965bn)
- OpenAI ($852bn)
- Databricks ($190bn)
- Stripe ($159bn)
- Anduril Industries ($61bn)
- Ramp ($60bn)
- Cognition ($48bn)
- Project Prometheus ($41bn)
- Ripple ($40bn)
- Figure AI ($39bn)
- Safe Superintelligence ($32bn)
- Crusoe Energy Systems ($30.9bn)
- VAST Data ($30bn)
- Scale AI ($29bn)
- The Boring Company ($23bn)
Questions and answers
How much is Sierra worth?
Sierra was valued at $15.8bn on 4 May 2026 (Series E funding round ($950m)), according to the 311 Unicorn Index.
Where is Sierra based?
Sierra is headquartered in San Francisco, United States.
When was Sierra founded?
Sierra was founded in 2023.
What does Sierra do?
AI customer-service agents for enterprises.
Is Sierra a unicorn?
Yes. Sierra is a privately held company valued at $1 billion or more, so it is a decacorn in the 311 Unicorn Index.
© 311 Institute 2026. Facts from the sources linked on this page. The selection, classification and links are the proprietary work of the 311 Institute, protected by copyright and database rights.