Sierra AI
About Sierra AI
Sierra is a conversational AI company founded by former Salesforce co-CEO Bret Taylor, building AI agents that handle customer service for brands, resolving inquiries naturally over chat and voice.
Funding Rounds
| Round | |||
|---|---|---|---|
| Jul 17, 2026 | Series E | $950M | $15.8B |
| May 4, 2026 | Series E | $950M | $15.8B |
| Jan 30, 2026 | Series D | $432.5M | $10B |
| Sep 15, 2025 | Series D | $350M | $10B |
| Oct 24, 2024 | Series C | $174.6M | $4.5B |
| Feb 1, 2024 | Series B | $85M | $1B |
| May 15, 2023 | Series A | $25M | - |
Perpetual Markets
No perpetual markets available.
Token Issuers
No token issuer markets available.
Valuation and funding data updated Aug 25, 2026, 9:24 AM UTC.
Market data updated Aug 25, 2026, 9:24 AM UTC.