Sierrarevenue, valuation & funding
Customer Service Automation SoftwareSan Francisco, CaliforniaFounded 2023CEO Bret Taylor
Sierra is the conversational AI platform for businesses.
Sierra revenue & ARR
Sierra's annual recurring revenue passed $200M in May 2026 (digg.com).
All 4 revenue readings, with sources
– source not recorded
Sierra valuation
Sierra is privately held, so there is no Sierra stock to buy. Investors valued it at $15.8B in its May 2026 Series E, led by Tiger Global and Google's GV.
Valuation history$15.8B Series E 2026$10B Series C 2025$4.5B Series B 2024$1B Seed 2024
Sierra funding rounds & investors
Sierra has raised $1.6B across four rounds since 2024. The latest was a $950M Series E in May 2026, led by Tiger Global and Google's GV.
| Date | Round | Raised | Valuation | Led by | Source |
|---|---|---|---|---|---|
| May 2026 | Series E | $950M | $15.8B | Tiger Global and Google's GV | TechCrunch |
| Sep 2025 | Series C | $350M | $10B | Axios | |
| Oct 2024 | Series B | $175M | $4.5B | scmp.com | |
| Feb 2024 | Seed | $110M | $1B | scmp.com | |
| Total raised | $1.6B |
Sierra competitors
Sierra competes most directly with Intercom, Yellow.ai, Ada, Cognigy and 5 others.
Intercom
Yellow.ai
Ada
Cognigy
PolyAI
Replicant
Quiq
Forethought
DecagonSierra CEO, founders & employees
Bret Taylor founded Sierra in 2023 and runs it as CEO. Sierra has 700 employees (May 2026, reveliolabs.com estimate), up from 165 a year earlier.
- Bret TaylorFounder & CEO
All 3 headcount readings, with sources
| As of | Employees | Source |
|---|---|---|
| May 2026 | 700EST | reveliolabs.com estimate |
| Jan 2025 | 165 | |
| Sep 2024 | 123 | Forbes |
Sierra FAQ
What is Sierra's revenue?
Sierra's annual recurring revenue passed $200M in May 2026, according to digg.com.
What is Sierra's valuation?
Investors valued Sierra at $15.8B in its May 2026 Series E, led by Tiger Global and Google's GV, according to TechCrunch.
How much funding has Sierra raised?
Sierra has raised $1.6B across four funding rounds. The latest was a $950M Series E in May 2026, led by Tiger Global and Google's GV.
Who owns Sierra?
Sierra is privately held. Its lead investors include Tiger Global and Google's GV.
How many employees does Sierra have?
Reveliolabs.com estimates Sierra's headcount at about 700 (May 2026).
Who is the CEO of Sierra?
Bret Taylor is the CEO of Sierra and founded the company in 2023.
Who founded Sierra?
Bret Taylor founded Sierra in 2023.
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How this page is sourced
8 from public sources · 2 estimates. Founder figures link to the second they were said; public figures name their source; estimates are marked EST and say whose they are. Not financial advice.
Updated Oct 7, 2026Data disclaimerReport a correctionClaim this profileRun Sierra? Join the podcast