As of Oct 26, 2026, Sierra AI's estimated valuation is $18.5B; its last round was a Series E on May 4, 2026, raising $950M at a $15.8B valuation.
Estimated Valuation$18.5B
Valuation As OfOct 26, 2026
Latest Raise$950M
Latest RoundSeries E
Latest Funding Valuation$15.8B
Latest Funding DateMay 4, 2026
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 | |||
|---|---|---|---|
| May 4, 2026 | Series E | $950M | $15.8B |
| Sep 15, 2025 | Series D | $391.25M | $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.
Frequently asked questions
What is Sierra AI's estimated valuation?
As of Oct 26, 2026, Sierra AI's latest tracked valuation estimate is $18.5B.
When was Sierra AI's last funding round?
Sierra AI's latest tracked funding round was a Series E on May 4, 2026, raising $950M at a $15.8B valuation.
Valuation and funding data updated Oct 27, 2026, 7:56 AM UTC.
Market data updated Oct 27, 2026, 7:56 AM UTC.