How AI Accounting Startup Rillet Raised $100M and Became a Unicorn in 48 Hours

Rillet co-founder and CEO Nicholas Koop exudes a justified confidence during our Zoom conversation, just a day after his company announced a $100 million funding round at a $1 billion valuation. The United States is currently grappling with a significant accountant shortage, a crisis that is fueling the rapid growth of his AI-native accounting platform. In fact, demand has been so strong that the company secured this capital in just 48 hours—without even actively seeking it. Rillet emerged from stealth two years ago and has since raised $200 million from top-tier investors, including ICONIQ, Andreessen Horowitz, and Sequoia. The company has also amassed 600 customers, most of whom are transitioning away from legacy systems like Oracle and NetSuite, according to Koop. Just a few weeks ago, Rillet held a board meeting where it shared its growth metrics since its $70 million Series B last summer. Annualized revenue had doubled in the last quarter alone, and the startup added new clients, many of them public companies. Notably, Rillet also announced an alliance with EY to bring AI tools to the auditing giant, signaling a major endorsement of its technology. Koop emphasized that his customers aren’t merely piloting Rillet; they are actively replacing ERP and accounting software from competitors such as Intuit, NetSuite, and Oracle. Following that board meeting, the momentum was palpable: text messages were exchanged, calls were made, and within 48 hours, Rillet had achieved unicorn status—all without pursuing the round. Seth Pierrepont, the general partner at ICONIQ who led the round, noted that while the deal came together quickly, "it wasn't a cold start." He told TechCrunch, "Rillet had already proven it could win against the incumbents that have owned this category for decades." ICONIQ had backed Rillet’s Series B, and with this latest investment, Pierrepont joins the company’s board. "A year of watching the team deliver on that made doubling down and leading the Series C an easy call." Julien Bek, Sequoia’s lead investor on the deal, echoed that sentiment, explaining that although 48 hours may seem rushed from an outside perspective, re-investing in Rillet was a "very easy decision" given the company’s growth trajectory over the past year. "Rillet’s initial wedge is accounting, but ultimately they are reinventing the entire finance function," Bek told TechCrunch, adding that agentic finance could become "one of the largest application software opportunities of the AI era." Sequoia led Rillet’s Series A last summer. "When the opportunity came together," Bek continued, "we already had all the context we needed." Rillet is among a wave of AI-native startups challenging legacy players. Earlier this year, public software stocks dipped as investors worried about how emerging AI tools would disrupt the status quo. Koop believes there’s some truth to those concerns. "AI is going to come hard at these legacy players," he said, because it offers customers compelling alternatives. Rillet, for example, was built for AI agents rather than humans, allowing human employees to work alongside AI agents on corporate bookkeeping tasks. This approach not only addresses the accountant shortage but also promises greater efficiency and accuracy, positioning the company as a disruptive force in financial software.

via TechCrunch