By Hamza Faisal

E2B, the startup that builds secure cloud computers for AI agents, said on Thursday it has passed $120 million in annualized run rate — up from just $8 million a year ago — in its first public revenue disclosure. The company said it expects to add more than $150 million in net new revenue this year, and that almost all of its growth has arrived inbound, with customers discovering it through open-source tools, word of mouth and recommendations from AI assistants rather than a sales team.

E2B gives every AI agent its own isolated computer in the cloud, a sealed-off machine where the agent can run code, open files, browse the web and use tools on a user's behalf, walled off from other tasks and from the customer's own systems. The idea is simple: an agent doing real work needs a computer of its own, just as a human employee does.

Two billion sandboxes and counting

Agents started 1 billion computers on E2B in June and passed 2 billion in October, and the company says it will hit 3 billion within the next 30 days. Close to 200,000 teams now use the platform, and 94 of the 100 largest companies in the United States have signed up. Customers include Meta, Hugging Face and Groq, and the agent startup Manus found E2B on its own and scaled up through its self-serve platform without a single sales call.

The sandboxes are built for scale and safety. Each agent gets its own networking setup, firewall and filtering, workspaces can be copied in milliseconds, and the platform is SOC 2 Type II compliant and ready for health data, so companies can plug it into their existing systems.

A market that is arriving fast

The timing is on E2B's side. Research firm Gartner predicts 40 percent of enterprise apps will include task-specific AI agents by the end of 2026, up from less than 5 percent in 2025, and every one of those agents needs a safe place to run. Agents have moved from answering questions to doing real work, and the infrastructure underneath them is becoming a business in its own right.

From a Prague apartment to Silicon Valley

E2B started in an apartment in Prague, where co-founders Vasek Mlejnsky and Tomas Valenta, friends since middle school, entered hackathons and used the prize money to pay rent. In 2023, OpenAI president Greg Brockman shared Mlejnsky's demo on X with no introduction, the post reached 524,000 people, and the founders moved to San Francisco soon after.

The company has raised $38 million to date, including a $21 million Series A led by Insight Partners in July 2025. "We see agents managing more complex systems that go beyond just running a single computer in a cloud," Mlejnsky said. "We're building a cloud of clouds — a future where each agent is managing and building its own private cloud that is able to adapt on the fly to the task the agent is working on at any given moment."