Sierra
Enterprise AI Agents
- Valuation
- $10B(2025)
- Total Funding
- $285M+
- Profit Status
- Pre-profit,rapid growth
- Employees
- ~400
About Sierra
Sierra is an enterprise conversational AI company co-founded by Bret Taylor (former Salesforce co-CEO and OpenAI board chair) and Clay Bavor (former Google VP). It builds branded AI agents that handle customer service and support for large companies, resolving issues end-to-end across chat and voice. Sierra reached a $10B valuation in 2025, making it one of the most valuable AI agent startups.
Company History
Founded 2023 by Bret Taylor (ex co-CEO of Salesforce, chairman of OpenAI's board, co-creator of Google Maps) and Clay Bavor (former Google VP of AR/VR). Sierra builds customer-facing AI agents for enterprises, orchestrating multiple LLMs with guardrails to resolve support issues autonomously. Raised $175M at a $4.5B valuation in 2024, then reached a $10B valuation in 2025. Customers include ADT, SiriusXM, Sonos, and WeightWatchers.
Company Timeline
4 milestones- 2023Founded by Bret Taylor and Clay Bavor
- Feb 2024Emerged from stealth with enterprise AI agent platform
- 2024$175M Series B at $4.5B valuation; customers include ADT, SiriusXM, Sonos
- 2025Reaches $10B valuation — among the most valuable AI agent startups
Funding Rounds
2 rounds| Date | Round | Amount | Investors |
|---|---|---|---|
| 2024 | Series B | $175M | Sequoia, Benchmark, $4.5B valuation |
| 2025 | Series C | $110M+ | Greenoaks, $10B valuation |
Products & Services
3- Sierra AI Agent Platform
- Agent SDK
- Voice agents
People & ecosystem
Key People
- Bret Taylor (Co-founder & CEO)
- Clay Bavor (Co-founder)
Key Investors
- Greenoaks
- Sequoia Capital
- Benchmark
- ICONIQ Growth
- Thrive Capital