Sierra Says It Passed $400m ARR After Adding $150m in Q3

Sierra, the AI agent company co-founded by Bret Taylor and Clay Bavor, says its annual recurring revenue has passed $400m, after it added more than $150m in the third quarter alone. The Sierra ARR figures come from the company itself and have not been independently audited.

In a blog post published on 30 October, the two co-founders wrote: “This week, we hit $400M+ in ARR, adding over $150M+ in ARR in Q3 alone. That’s more ARR in one quarter than we generated all of last year.” Sierra sells AI agents that big companies use to deal with their customers, and it launched “just over two and a half years ago”, they wrote.

Sierra ARR growth, in the company’s words

The company says its growth is speeding up. “We took six months to double from $100M to $200M ARR, and only five months to double from $200M to $400M,” the post says. Taylor repeated the figures on X shortly afterwards, calling the period “the most remarkable quarter in Sierra’s 2.5 year history” and adding: “The most exciting thing to me is that our pace is accelerating.” Sierra’s own account posted the same numbers.

Sierra gives three reasons. It says its customers, “some of the largest and most heavily regulated businesses in the world”, want to do more with agents, faster. It says agents are moving “from one-and-done support conversations to interactions that last weeks or months and drive revenue.” And it credits its own tool for building and improving agents, saying a large US retailer with more than $40bn in revenue “went from first meeting to live agent in 27 days” this month. The retailer is not named.

The company says it now works with “almost 50% of the Fortune 50”. It also restated its pricing model: “You pay for outcomes, not tokens used — a loan refinanced, an insurance claim paid, a sale closed, a customer retained.”

Poppy, a standard still in development

The post also says Sierra is developing an open standard called Poppy, “with over 50 enterprises including Meta, Instinct, Rocket, Shopify, Stripe, and Walmart”, to give businesses “fine grained controls over how personal agents interact with your brand”. Sierra gave no specification, launch date or link for Poppy.

The idea is familiar. In early October, TSN reported CNBC’s account of a personal agent protocol published by Meta, Walmart, Stripe and Sierra, meant to let businesses recognise and check AI agents acting for people. Sierra’s post does not say whether Poppy is that protocol or a successor to it. The question of who answers for an agent’s actions is also now on regulators’ desks: four UK regulators said this week that existing law already applies to AI agents.

What the Sierra ARR figures show, and what they leave out

Annual recurring revenue is a company’s own measure of the yearly value of its ongoing contracts. It is not the same as revenue booked in accounts, and Sierra does not say how it calculates the figure, which contracts count towards it, or whether its third quarter is a calendar or financial one. None of the numbers has been checked by an outside party. What the post does give is a direction and a pace, stated publicly by both founders and repeated across the company’s own channels.

The growth claim is also notable for what is missing. There is no funding round and no valuation in the post, so it is a trading update rather than a fundraising story. That sets it apart from rivals such as Serval, which this week announced a $150m round at a $3bn valuation for its AI agents that handle internal IT requests.

The bigger picture is a crowded race to become the platform companies use for their agents. Large vendors are building their own control points, such as ServiceNow’s 11-member alliance with OpenAI and Anthropic. Sierra’s pitch of paying for outcomes rather than tokens is a bet that customers will reward results over usage, but the post offers no outcome data to test it. For now, the Sierra ARR figures show strong demand on the company’s own account. Independent evidence would come from customers, filings or audited results.

Sources

• Sierra blog: Our customers’ ambition is accelerating our growth (Bret Taylor and Clay Bavor, 30 Oct 2026)
• Bret Taylor on X, 30 Oct 2026
• Sierra on X, 30 Oct 2026

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