May 4, 2026
Sierra
Sierra helps businesses to build and deploy AI agents that communicate with users across channels such as chat, voice, email, and messaging.
- Round
- Series E
- Amount raised
- $950M
- Lead investor
- Benchmark
- Industry
- Artificial Intelligence (AI)
- Headquarters
- San Francisco, United States
- Employees
- 501-1000
- Website
- sierra.ai
- View profile →
Other investors
- Google Ventures
- Greenoaks
- Sequoia Capital
- SoftBank Vision Fund
- Tiger Global Management
Source: Crunchbase snapshot 2026-05-15