fastest growing startups based on data, not vibez

Happy Tuesday Brex Community,

We just launched our quarterly report on the fast growing startups, see image below and link to the report. Most lists like this are not based on data but on some anecdotes from a survey or some other opaque data set (or just vibez), not this one, this is based on where Brex customers (now ~40,000, which includes ~350 public companies) are spending real 💰

The previous report, see below, had OpenRouter in the #2 slot and they are now rumored to be acquired by Stripe for $7B+ for a mix of cash/stock. Most likely, one of the above companies will get acquired for a lot of money before the next report comes out, lets see how things play out.

Have a great week!

Shai Goldman

Fibr AI turns a brand's website into an adaptive experience platform. Every visitor, human or AI gets an experience tailored to their context and intent. Founders AJ Goyal (CEO) and Pritam Roy (CPO) recently raised a $5.7M seed from Accel, who also led the pre-seed. That brings total funding to $7.5M.

PROBLEM: Websites were built for a different internet. One page. One message. One audience. Today's marketers face a different reality. People arrive with different intent, from different channels, expecting experiences that are relevant to them. And for the first time, marketers have another audience to serve: AI, which increasingly reads, understands, and recommends brands before people even visit. Most websites were never built for this reality. They're still static, unable to adapt to different visitors, different contexts, or different audiences, let alone AI. The internet has evolved. Websites haven't.

SOLUTION: Fibr AI transforms static websites into adaptive experience platforms. Instead of serving one fixed experience, websites continuously adapt to who or what is interacting with them. Every interaction becomes context-aware, whether it's a customer arriving from an ad, an existing user returning to the site, or an AI agent retrieving information. The platform dynamically adapts experiences for people while making the website easier for AI to understand, enabling brands to serve both audiences from the same website. The result is one website capable of delivering millions of personalized experiences, powered by a compounding memory that continuously learns, evolves, and improves.

WHY NOW: Relevance has become the new competitive advantage. As AI makes content, design, and campaigns easier than ever to create, experiences are becoming the primary differentiator. The brands that win will be the ones that deliver the most relevant experience, for every visitor, whether it's a person or an AI. Companies are already making this shift. Fibr powers adaptive experiences for multiple Fortune 500 companies across banking, financial services, healthcare, and professional services, with customers including Noom, Cedars-Sinai, Tata Digital, NDR, A1 Garage, and Court Avenue.

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Brex is the intelligent finance platform built for speed and control. Combining corporate cards, banking, treasury, expense management, bill pay, travel, and accounting, Brex helps companies spend smarter and move faster in 120 countries. By integrating AI across every workflow, Brex enables founders and finance teams to eliminate manual work, do more with less, and accelerate impact. More than 35,000 companies from startups to enterprises run on Brex, including Anthropic, OpenAI, Cursor, Granola, ServiceTitan, Robinhood, DoorDash, etc.