Exclusive: Accounting AI startup Rillet reaches unicorn status with $1 billion valuation. Its founder says he wants to give CFOs back their weekends

Rillet, a two-year-old startup building what it calls the first truly AI-native accounting platform, has raised a $100 million Series C at a $1 billion valuation, the company told Fortune exclusively—joining the ranks of AI-era unicorns racing to unseat decades-old enterprise software giants.

The round, led by ICONIQ with participation from returning backers Sequoia Capital, Andreessen Horowitz and Oak HC/FT, plus new investors including Bain Capital Ventures, Sequoia Global Equities, Battery Ventures, FirstMark, Scale Venture Partners and Creandum, marks Rillet’s third fundraise in the past year and pushes its total funding past $200 million.

ICONIQ general partner Seth Pierrepont is joining Rillet’s board as well.

For Rillet co-founder and CEO Nicolas Kopp, the milestone is as much personal as financial.

In an interview with Fortune , Kopp described the company’s mission as freeing CFOs from the drudgery that keeps them chained to spreadsheets long after everyone else has logged off.

“CFOs really struggle day to day.

They can’t see their families on weekends,” Kopp said, because they have to spend so much time reviewing data and creating slideshows.

Noting that he has a finance and accounting background himself and that his company is full of people with accounting backgrounds, he said he wants AI to change that—not by replacing finance professionals, but by acting as their tireless back office.

“Our message is not that we’re coming after jobs.

That’s just not correct,” he said, stressing that “domain expertise” is core the company’s mission: “We’re positioning AI as a helper to that individual and what they can achieve.” From launch to unicorn in two years Rillet’s rise has been fast even by startup standards.

Kopp said the company launched publicly roughly two years ago, raised a Series A led by Sequoia last summer, then closed a Series B just weeks later—a round that saw new annual recurring revenue double quarter over quarter.

The company says it doubled its new ARR again in the three months leading into this latest raise, and now serves more than 600 customers.

Those customers include some of the fastest-growing AI companies in the world—Neuralink, Skild AI and Mercor among them—alongside a growing share of decidedly non-tech businesses.

Roughly 40% of Rillet’s customer base now sits outside the tech and AI sectors, Kopp said, spanning industries as varied as waste recycling and movie studios, describing the shift as evidence that AI-native finance tools are crossing into the broader U.S. economy.