Sierra
A conversational AI platform that businesses use to create and deploy their own branded AI agents, mainly for customer service over chat and voice. Sold to large enterprises, with offices in North America, Europe and Asia.
Artificial intelligenceConversational AI agents for customer serviceSan Francisco, United States
FoundersSince 2023
- Valuation
- $16B
- Total raised
- $1.5B
- Last round · May 2026
- Series E
- Founded
- 2023
- Quarters in VP50
- 4
Valuation
| Round | Date | Post-money valuation | Raised | Led by |
|---|---|---|---|---|
| Funding round | Oct 28, 2024 | $4.5B | $175M | Greenoaks Capital |
| Funding round | Sep 4, 2025 | $10B | $350M | Greenoaks |
| Series E | May 4, 2026 | $16B | $950M | GV and Tiger Global |
Post-money valuation at each priced round. Log scale.Hover a point for the round
Updated
In VP50
- Q4 2023: no place
- Q1 2024: no place
- Q2 2024: no place
- Q3 2024: no place
- Q4 2024: #43
- Q1 2025: #49
- Q2 2025: no place
- Q3 2025: #45
- Q4 2025: no place
- Q1 2026: no place
- Q2 2026: #43
- Q3 2026: no place
- Q4 2026: no place
Place by quarter since Q4 2023. Best place #43.
Funding rounds
DateRound · leadRaisedValuation
Signals
Team
- Bret TaylorCo-founder, CEO
Clay BavorCo-founder- Julia Brau DonnellyCFO
