Atlas / Agent platforms and enterprise agents / Sierra
Sierra
AI Market Atlas · by Pro Pluribus
Sierra
Customer-experience agents; passed $400M ARR (30 Oct); valued at $15.8B.
What it offers
Main offerings
- Sierra
- Branded customer-service agents.
- Personal Agent Protocol
- Open protocol with Meta (6 Oct) for how consumers' personal agents deal with businesses.
- Anon (acquired Nov)
- Browser and login infrastructure so agents can use websites without APIs.
Recent news
- Sierra acquires Anon to let its agents work on websites without APIsBrowser and login infrastructure for finishing tasks in portals with no API.Sierra ↗
- Sierra passes $400M ARR after adding $150M+ in Q3 aloneFrom $200M to $400M in about five months, one of the fastest climbs in enterprise AI.Sierra ↗
- Sierra and Meta announce the open Personal Agent ProtocolAn attempt to set the standard for how consumer agents deal with businesses; 35 more design partners joined Oct 9.Unite.AI ↗
- Sierra raises $950M at about $15.8B valuationTiger Global and GV lead as customer-service agents become the most funded agent categoryTechCrunch ↗
- Bret Taylor's Sierra raises nearly $1BValuation up from $10B in fall 2025, with ARR about $150MCNBC ↗
This map is a by-product of the work. Keeping track of what each of these actually does, and which ones are worth your time, is part of how I advise founder-led companies on AI. If you want that applied to your business, the first conversation is free.
Book a 30-minute conversation →Compiled from public sources by Pro Pluribus; updated 10 Nov 2026. General information, not advice. Company names and logos belong to their owners and are used to identify them, without affiliation or endorsement. Terms