San Francisco startup Rox has raised a $100 million Series B co-led by General Catalyst and March Capital, lifting the two-year-old company to a $1.3 billion valuation, according to Ventureburn.

Sequoia Capital and Factory raised their stakes, GV returned, and Databricks Ventures and Prosperity7 Ventures joined as new backers. The company plans to spend the new capital on AI research, custom models and assessment tools, and to expand its US commercial teams.

Customers named by the company include GitLab, Puma Energy, Ramp, MongoDB, Groq and Trafigura.

The surprise is the target. Salesforce has dominated the sales stack for two decades and generated $41.5 billion in revenue for fiscal 2026, yet investors are backing a startup that argues AI agents can outdo it.

Rox hosts a revenue AI agent on top of a customer's own data that filters leads, schedules meetings, handles deals and expands accounts inside the tools sales teams already use.

The numbers behind the unicorn valuation are unusual even by AI-startup standards, per Ventureburn.

Rox says its annual recurring revenue grew more than 10x in its first year on the market, and its net revenue retention among enterprise customers exceeds 700%, meaning existing customers now spend several multiples of their original contracts.

Cited results include a global IT services company building $330 million of qualified pipeline in eight weeks, a medical technology firm generating five months of $24 million revenue, and a payroll provider cutting outreach costs in half across 4 million prospects.

One caveat: Rox has not disclosed its actual revenue figure.

The broader agent stack keeps drawing money — TokenPost reports YC graduate Inkbox raised a $5.3 million seed led by Peak XV for persistent AI agents that hold context across email, iMessage, WhatsApp and Slack — so the question is whether software-selling agents become a new category or a feature incumbents absorb.