AI accounting startup Rillet becomes a unicorn in 48 hours

Rillet, an AI-native accounting startup that emerged from stealth two years ago, raised $100 million at a $1 billion valuation — and closed the round in 48 hours without even trying to raise, co-founder and CEO Nicolas Kopp told TechCrunch. The company has now raised $200 million total from investors including Iconiq, Andreessen Horowitz, and Sequoia, and counts 600 customers, most of whom are ripping out legacy accounting systems like Oracle and NetSuite rather than merely piloting Rillet alongside them.

The round came together fast: a few weeks ago, Rillet held a board meeting and shared that its annualized revenue rate had doubled in the previous quarter alone, that it had added new clients — many of them public companies — and that it had struck an alliance with EY to bring AI tools to the auditing giant. After that meeting, Iconiq general partner Seth Pierrepont, who co-led Rillet’s $70 million Series B last summer and is now joining its board, and Sequoia’s Julien Bek moved quickly to lead the new round; both investors described the decision as an easy one given a year of watching Rillet win customers from incumbents that have owned the category for decades.

Rillet is built for AI agents to handle bookkeeping alongside human accountants, with security features like model routing — letting customers pick which foundation model handles their data — and no cross-training between customers’ data. About three months ago, the company added a governance feature that lets accountants audit every decision an AI agent makes, including which numbers it pulled and how it calculated them. Kopp said that feature only became possible recently because agents got powerful enough to handle multi-step workflows over longer stretches, making auditability more important. Public companies are currently required to have a human approve every transaction an AI agent makes.

Kopp doesn’t expect the technology to cause mass accounting job losses anytime soon, arguing Rillet automates grunt work rather than replacing accountants, even junior ones. “AI is going to come hard at these legacy players,” he said, because it gives customers compelling alternatives. That’s landing against a real shortage: the number of students graduating with accounting degrees has declined since 2010, and a recent survey by the Controllers Council Organization found 61% of finance leaders struggled to find finance, accounting, or CPA talent in the past year. The U.S. Bureau of Labor Statistics projects accounting-related roles to grow at least 5%, adding 72,800 jobs by 2034, and doesn’t expect AI to reduce demand for accountants overall.

Why it matters

Rillet’s 48-hour raise is as much a signal about investor appetite for AI-native challengers to Oracle and NetSuite as it is about the company itself — and its bet that human accountants become auditors of AI agents, rather than being replaced by them, is the model other vertical-AI startups will be judged against.