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
2023
Founded by Bret Taylor and Clay Bavor
Feb 2024
Emerged from stealth with enterprise AI agent platform
2024
$175M Series B at $4.5B valuation; customers include ADT, SiriusXM, Sonos
2025
Reaches $10B valuation — among the most valuable AI agent startups
Products & Services
Company Details
Focus Area
Enterprise AI Agents
Stage
Founded
2023
Headquarters
San Francisco, CA
Employees
~400
Financial Overview
Total Funding
$285M+
Valuation
$10B (2025)
Profit Status
Pre-profit, rapid growth
Funding Rounds
- Series B$175M2024Sequoia, Benchmark
- Series C$110M+2025Greenoaks, $10B valuation
Key Investors
Key People
- Bret Taylor (Co-founder & CEO)
- Clay Bavor (Co-founder)