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).
– 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 TaylorCo-founder & 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
How much money does Sierra make?
Sierra brings in about $200M a year: its annual recurring revenue was $200M in May 2026, according to digg.com.
How much is Sierra worth?
Companies don't publish a net worth. The closest figure is Sierra's valuation: $15.8B, set in May 2026.
Who owns Sierra?
Sierra is privately held by its founders, employees and investors, including Tiger Global and Google's GV.
Is Sierra publicly traded?
No. Sierra is a private company, so its shares are not listed on a stock exchange.
How much funding has Sierra raised?
$1.6B across 4 rounds; the latest was a $950M Series E in May 2026.
Who is the CEO of Sierra?
Bret Taylor, a co-founder.
Who founded Sierra?
Bret Taylor, in 2023.
How many employees does Sierra have?
About 700 as of May 2026 (reveliolabs.com estimate).
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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