Sierra
Customer service AI agents for large brands, founded by Bret Taylor.
- Revenue
- About $200M annualised (May 2026, company reported)
- Value
- $15.8B post-money ($950M Series E, May 2026, led by Tiger Global and GV)
- Growth
- Annualised revenue doubled in two quarters, from $100M in Nov 2025
- Based in
- San Francisco, US
- Listed
- Private
Large brands buy support agents that are paid for by outcome, and revenue has doubled quickly.
At about 79 times revenue, growth has to stay very high for the valuation to hold.
Money coming in
Who pays Sierra, and for what.
No customers of Sierra mapped yet.
Money going out
Who Sierra pays to do what it does.
No suppliers of Sierra mapped yet.
Where it sits on the map
Competitors and neighbours
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Agentforce ARR about $800M in the quarter to Jan 2026, up 169% year on year (company, Q4 FY26)
Open profileVoice AI for dubbing, narration and voice agents, with an API that other builders use to add speech.
About $500M ARR (Apr 2026, Sacra estimate)
Open profileTurns doctor and patient conversations into clinical notes and billing codes for health systems.
Contracted ARR of $117M was reported for early 2025, the last figure found
Open profileCustomer support agents for consumer brands, priced per resolved conversation.
Passed $100M annualised (reported Aug 2026, citing Newcomer)
Open profileAI for lawyers that drafts, researches and reviews contracts, sold to large law firms.
About $300M ARR (Sacra estimate, May 2026). One blog reports $400M, not confirmed
Open profileAI platform for law firms that drafts, reviews and researches contracts, with more than 1,000 customers in 50 markets.
Passed $100M ARR (Apr 2026, company reported)
Open profileFree clinical search tool for doctors that answers medical questions with cited sources.
About $300M annualised by mid-2026 (reported). Sacra estimated $150M for 2025
Open profileAI for investment bankers and private equity analysts, built for research and deal work.
Over $50M annual recurring revenue (reported)
Open profileAmbient AI that writes clinical notes and coding for doctor groups and health systems.
Open profileSources: cryptobriefing.com, idlen.io
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