Oct 7, 2026 Sierra open roles snapshot
A third-party company tracker listed 53 open roles at Sierra.
Sierra Open roles53 open roles† The Consensus Oct 6, 2026 Sierra and Meta introduce the Personal Agent Protocol Announced
Sierra and Meta, with partners including Shopify, Stripe, Walmart, Genesys, Instinct and Rocket, announced the Personal Agent Protocol, an open standard for how personal AI agents authenticate and act with businesses (read/write permissions, visibility into agent actions). A v0.1 spec is planned for later in October 2026.
Sierra Partnership— Sierra Sep 28, 2026 Ghostwriter expands to Slack and Teams
Ghostwriter
Sierra Feature update— Sierra Aug 7, 2026 Sierra launches Voice Personas
Sierra Voice Personas · Voice Personas
Sierra Product launch— Sierra Jul 16, 2026 Sierra launches Horizon Agents
Horizon Agents · Horizon
Sierra Product launch— Sierra May 4, 2026 Sierra serves over 40% of the Fortune 50
Sierra reported serving more than 40% of the Fortune 50, with agents on its platform powering billions of customer interactions.
Sierra News40 % of Fortune 50 Sierra May 4, 2026 Sierra raises $950M
Sierra raised $950 million from new and existing investors led by Tiger Global and GV.
Sierra Funding round$950M Sierra Mar 31, 2026 Sierra headcount estimate
Revelio Labs estimated Sierra's workforce at approximately 756 employees in the first quarter of 2026.
Sierra Employee count756 employees† Revelio Labs Mar 25, 2026 Sierra introduces Ghostwriter
Ghostwriter · Ghostwriter
Sierra Product launch— Sierra Feb 6, 2026 Sierra exceeds $150M ARR
Sierra reported more than $150 million in annual recurring revenue as it entered its third year.
Sierra Revenue disclosure$150M Sierra Nov 21, 2025 Sierra reaches $100M ARR
Sierra announced that it reached $100 million in annual recurring revenue seven quarters after its public launch.
Sierra Revenue disclosure$100M Sierra Nov 5, 2025 Sierra launches Agent Data Platform
Sierra Agent Data Platform · Agent Data Platform
Sierra Product launch— Sierra Nov 5, 2025 Sierra launches Agent OS 2.0
Sierra Agent OS · Agent OS 2.0
Sierra Feature update— Sierra Nov 5, 2025 Sierra launches Agent Studio 2.0
Sierra Agent Studio · Agent Studio 2.0
Sierra Feature update— Sierra Sep 18, 2025 Sierra launches Agent Studio
Sierra Agent Studio · Agent Studio
Sierra Product launch— Sierra Sep 4, 2025 Sierra reports hundreds of enterprise customers
Sierra reported hundreds of customers across financial services, healthcare, telecommunications, retail and consumer services.
Sierra User count100 enterprise customers Sierra Sep 4, 2025 Sierra raises $350M
Sierra raised $350 million in additional capital led by Greenoaks to expand Agent OS and its international business.
Sierra Funding round$350M Sierra Oct 6, 2024 Sierra launches Voice
Sierra Voice · Sierra Voice
Sierra Product launch— Sierra Feb 13, 2024 Sierra launches Agent OS
Sierra Agent OS · Agent OS
Sierra Product launch— Sierra