Rex
AI Operations Partner for Enterprise Order to Cash
Rex is active in the b2b space based in London, England, United Kingdom.
Profile
Rex is an AI-native service for order to cash. We replace people-heavy operations with AI agents that continuously manage invoices, customers and exceptions.
Order to cash is a $60B outsourced function because the work is too messy for traditional automation. Every customer has different context, exceptions do not follow clean rules, and the next step is often buried in emails, portals, handoffs, or someone’s memory. Rex agents run continuously in the background and resolve work to SLA standards so cash keeps moving. We're live with pre-IPO tech companies, managing >$500m in receivables from F100 companies, cutting manual follow-up cycles from weeks to hours.
We founded Rex after spending four years building Sequence, an a16z-backed finance ops platform, from zero to Series A — where we saw firsthand that at-scale, O2C still runs on manual labour.
Rex is the #1 winner of the Vercel AI Accelerator out of 2,500 teams, selected by Guillermo Rauch and leaders from OpenAI, Anthropic, Browserbase and more.
As a business in b2b, Rex is listed here with the public details available about it.
London, England, United Kingdom is where the company is located.
Its current recorded stage is Summer 2026.
The company reports a headcount in the 2 range.
Directory analysis
Rex is an AI-native service that automates the order‑to‑cash process for enterprises, replacing manual operations with AI agents that manage invoices, customer interactions, and exceptions. It targets the $60 B outsourced order‑to‑cash market, delivering continuous background processing to meet SLA standards and reduce manual follow‑up cycles from weeks to hours. The company currently serves pre‑IPO tech firms and manages over $500 million in receivables from Fortune 100 customers.
Positioning: Rex positions itself as a specialized AI operations partner focused on the complex, exception‑heavy order‑to‑cash workflow. Its early traction with high‑value clients indicates a potential to capture a niche segment of the broader finance‑automation market, though competition from larger enterprise automation vendors remains.
Note: Rex is a UK‑based startup with only two employees, operating in a highly specialized AI‑driven finance ops niche.
Auto-generated directory analysis from public data · updated 6 Oct 2026. Informational only, not investment advice.
| Sector | B2B |
|---|---|
| Headquarters | London, England, United Kingdom |
| Country | United Kingdom |
| Employees | 2 |
| Stage | Summer 2026 |
Website: www.rex.inc
Browse related
Create a free account