Sierra at a glance
Question | Answer | As of |
|---|---|---|
Who owns Sierra? | Its founders, staff and investors led by Sequoia, Benchmark, Greenoaks, Tiger Global and GV; it is private | Nov 2026 |
ARR | More than $400 million | Oct 30, 2026 |
Valuation | Over $15 billion | May 4, 2026 |
Funding | About $1.6 billion disclosed, plus an undisclosed SoftBank investment | May 2026 |
Customers | Almost half of the Fortune 50; hundreds of large companies | Oct 2026 |
Employees | More than 600, by Sierra’s own count of staff using its internal tools | Jul 2026 |
CEO | Bret Taylor, co-founder | Nov 2026 |
Founded | 2023, by Bret Taylor and Clay Bavor; launched February 13, 2024 | 2023 |
Headquarters | 150 Sutter Street, San Francisco, with offices in 11 more cities | Nov 2026 |
Sierra sells AI agents that handle customer service for big brands: answering questions, changing orders, processing returns and, increasingly, taking calls. Companies such as ADT, Cigna, SiriusXM, Rocket Mortgage, Nordstrom, SoFi and Wayfair use it. Instead of charging per seat or per message, Sierra charges by outcome: “Sierra gets paid only when we complete a task for you” (Sierra).
Sierra in 2026: $400 million ARR
Sierra grew faster in 2026 than at any point before. It reached $100 million in ARR in November 2025, took six months to double to $200 million and five more to double again: “This week, we hit $400M+ in ARR, adding over $150M+ in ARR in Q3 alone,” Taylor and Bavor wrote on October 30, 2026 (Sierra). It now works with almost half of the Fortune 50.
The year brought a $950 million raise, four acquisitions, offices in Madrid, Sydney, Toronto, Munich and Seoul, and new products: Ghostwriter, an agent that builds other agents, in March; Horizon, for long tasks such as originating a loan, in July; and, at its October summit, its own models and Poppy, a protocol for personal shopping agents built with Meta (Sierra). Poppy 1.0 went live on November 13 for every merchant on Shopify.
Who owns Sierra?
Sierra is private. Its founders, staff and investors own it: Sequoia and Benchmark backed it first, Greenoaks led two rounds, and Tiger Global and GV led the latest, with SoftBank’s Vision Fund 2 also invested. Forbes estimated in 2025 that Taylor owned about a quarter of the company.
What is Sierra’s revenue?
Sierra publishes its ARR as it passes milestones. It said it hit $100 million “seven quarters after we launched in February 2024” (Sierra), started 2026 with more than $150 million (Sierra), and passed $400 million in late October 2026, adding more in the third quarter than in all of 2025. It hasn’t disclosed profits.
Sierra ARR (annual recurring revenue)
Date | ARR | Said by |
|---|---|---|
Oct 30, 2026 | $400M+ | Bret Taylor and Clay Bavor |
May 2026 | $200M, “in nine quarters” (Sierra) | Sierra |
Feb 6, 2026 | Over $150M | Sierra |
Nov 21, 2025 | $100M | Sierra |
Oct 2024 | Over $20M | Reuters |
Sierra MRR (monthly recurring revenue)
Sierra doesn’t publish MRR. $400 million ARR works out to about $33 million a month (our calculation).
How much has Sierra raised? Funding and valuation
About $1.6 billion in disclosed rounds, plus an undisclosed investment from SoftBank. The latest came in May 2026: “We’re raising $950 million from new and existing investors, led by Tiger Global and GV, at a valuation of over $15 billion” (Sierra); TechCrunch put the post-money valuation above $15 billion (TechCrunch).
Date | Amount | Lead | Valuation |
|---|---|---|---|
May 4, 2026 | $950M | Tiger Global and GV | Over $15B |
Dec 4, 2025 | Not disclosed | SoftBank Vision Fund 2 | Not disclosed |
Sep 4, 2025 | $350M (Sierra) | Greenoaks | $10B |
Oct 28, 2024 | $175M (SiliconANGLE) | Greenoaks, with Thrive and ICONIQ | $4.5B |
Feb 13, 2024 | $110M (Fortune) | Sequoia and Benchmark | Nearly $1B |
The company is Sierra Technologies, Inc., a Delaware corporation headquartered in San Francisco, with a UK subsidiary (Sierra).
What does Sierra do? Products
Taylor and Bavor started Sierra in early 2023 and launched it on February 13, 2024 as “the conversational AI platform for businesses” (Sierra). Voice became its biggest channel in 2025. Its products now include Agent OS, a no-code Agent Studio, Ghostwriter, Horizon, voice agents with their own personas, and its own models.
Date | Launch |
|---|---|
Nov 13, 2026 | Poppy 1.0 with Meta and Shopify |
Nov 5, 2026 | Acquires Anon, a browser-agent startup |
Oct 6, 2026 | Sierra Summit: Curie and Fleming models, Tandem Voice, Poppy |
Jul 23, 2026 | Acquires Takeoff |
Jul 16, 2026 | Horizon, for long-running tasks |
Jun 10, 2026 | FedRAMP High certification |
Apr 23, 2026 | Acquires Fragment (Paris) |
Mar 27, 2026 | Acquires Opera Tech (Tokyo) |
Mar 25, 2026 | Ghostwriter, an agent that builds agents |
Nov 5, 2025 | Agent OS 2.0 and Agent Studio 2.0 |
Mar 26, 2025 | Acquires Receptive AI |
Oct 9, 2024 | Voice agents |
Feb 13, 2024 | Public launch |
Sierra pricing
Sierra doesn’t publish prices. It charges by outcome, such as a resolved conversation, so customers pay for results rather than seats or AI usage.
Questions about Sierra
Sierra’s valuation drew scrutiny: at $10 billion and $100 million ARR, TechCrunch noted it was “valued at a 100x revenue multiple” (TechCrunch). Taylor’s role as chair of OpenAI’s board has also raised conflict-of-interest questions since Sierra launched; he has said he recuses himself “whenever there is a potential for overlap” (Fortune).
Sierra vs Decagon, Salesforce and Fin
Decagon, its closest startup rival, was valued at $4.5 billion in January 2026 (Decagon). Salesforce’s Agentforce passed $1.5 billion in ARR in August 2026 (Salesforce), and Salesforce agreed the same summer to buy Fin, formerly Intercom. Sierra competes with all three for the customer-service budgets of large companies.
Who is the CEO of Sierra?
Bret Taylor, who co-founded Sierra with Clay Bavor; the two met at Google in 2005. Taylor co-created Google Maps, was Facebook’s CTO and co-CEO of Salesforce, and chairs OpenAI’s board; Bavor spent 18 years at Google, where he ran Google Labs. Sierra hired its first CFO, Pinterest’s Julia Brau Donnelly, in August 2026.
Person | Role |
|---|---|
Bret Taylor | Co-founder and CEO; chair of OpenAI’s board |
Clay Bavor | Co-founder and director; formerly ran Google Labs |
Eric Eyken-Sluyters | President of field operations |
Julia Brau Donnelly | Chief financial officer since August 2026, formerly Pinterest’s CFO |
Kyle Randolph | Chief information security officer since November 2026 |
Bret Taylor’s bio and contact routes: Sierra CEO Bret Taylor: email, LinkedIn and bio.
Where is Sierra based?
San Francisco, at 150 Sutter Street (Sierra), with offices in Atlanta, London, Madrid, Munich, New York, Paris, Seoul, Singapore, Sydney, Tokyo and Toronto (Sierra). Sierra publishes no headcount; in July 2026 it said 600 people were using its internal agent and that most of the company worked in it daily (Sierra), so it has more than 600.
Key events
Date | Event |
|---|---|
Nov 13, 2026 | Poppy 1.0 goes live |
Oct 30, 2026 | Passes $400M ARR |
Aug 31, 2026 | Julia Brau Donnelly joins as CFO |
May 2026 | $200M ARR |
May 4, 2026 | $950M at a valuation over $15B |
Feb 6, 2026 | Over $150M ARR |
Dec 4, 2025 | SoftBank invests; Tokyo office |
Nov 21, 2025 | $100M ARR |
Sep 4, 2025 | $350M at $10B |
Oct 28, 2024 | $175M at $4.5B |
Feb 13, 2024 | Launch and $110M raised |
Early 2023 | Founded by Bret Taylor and Clay Bavor |
More on Sierra and similar companies
Sierra CEO Bret Taylor: from Google Maps and Facebook to OpenAI’s board and Sierra
AI customer service companies: Sierra’s category
AI agent companies: startups building agents for business
Fastest-growing SaaS companies: Sierra and others by ARR growth
SaaS unicorns: every SaaS company worth $1B or more
WorkOS dossier: the login infrastructure behind Sierra and other AI companies
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