Rox, a startup that builds AI agents for customer research and sales outreach, has raised $100 million in Series B funding at a $1.3 billion valuation, the company told Fortune in an exclusive published Wednesday¹.

Fortune said General Catalyst and March Capital co-led the round, with Sequoia and GV returning and Prosperity7 joining as a new investor¹. Techmeme carried the Fortune account the same morning.

The company, cofounded by Ishan Mukherjee, says its software uses AI agents to research customer accounts, suggest which to prioritize and prepare outreach so sales teams spend less time on administrative work¹. Fortune reported that early customers named by Rox include Ramp, New Relic, Trafigura, MongoDB, Groq and America's Auto Auction, and that Rox said annual recurring revenue grew more than tenfold since its first year after launch¹.

Mukherjee previously founded Pixie Labs, which Fortune said New Relic acquired for about $150 million in 2020¹. Fortune said other cofounders include Shriram Sridharan, a founding member of Amazon's Aurora database service; Diogo Ribeiro, a former Google employee; and Stanford AI Lab professor Christopher Ré, and that Mukherjee was a product lead for Apple's Siri Knowledge Graph¹.

General Catalyst partner Marc Bhargava told Fortune the firm invested in 2024 before Rox had a product or revenue¹. Fortune said Rox plans to use the capital for more AI research and product development and to expand its U.S. sales, marketing and commercial team fivefold next year¹. How the company will compete with large CRM vendors, and whether the growth figures can be independently verified, were not established beyond the company's statements to Fortune¹.