Rillet

A routine board meeting triggered an extraordinary rush, sending investors into negotiations that moved faster than anyone expected. As stated by Techcrunch American startup Rillet, which develops an AI-powered accounting platform, has raised $100 million in a Series C round. Following the investment, the company’s valuation reached $1 billion, while the entire negotiation and deal-closing process took just 48 hours. The new round was not planned in advance. Rillet co-founder and CEO Nicholas Koop explained that investors accelerated talks after a board meeting where the team presented its business growth results.

In a single quarter, Rillet doubled its annualized revenue run rate. The company also began working with public companies and formed an alliance with EY to implement artificial intelligence tools. Since emerging from stealth mode two years ago, Rillet has raised a total of $200 million. The startup’s investors include ICONIQ, Andreessen Horowitz, and Sequoia. The platform is used by around 600 companies migrating from legacy accounting systems, including Oracle and NetSuite products. The Series C round was led by ICONIQ. Its general partner, Seth Pierrepont, joined Rillet’s board of directors.

The fund had already invested in the previous Series B round, giving it an opportunity to assess the startup’s growth rate and demand for its product. Rillet has already proven that it can outperform incumbent players that have dominated this category for decades. – Seth Pierrepont, ICONIQ Sequoia, which had previously led the Series A round, also continued to support the company. The fund’s lead investor, Julien Bek, believes that accounting is only the first stage of Rillet’s development and that the platform could eventually cover a broader range of business financial processes.

Rillet’s initial entry point is accounting, but ultimately, they are reimagining the entire finance function. – Julien Bek, Sequoia Rillet was designed from the outset to use AI agents in corporate accounting. Automated tools handle parts of workflows, while accountants can monitor the results and supplement them with their own expertise. According to Nicholas Koop, Rillet customers most often switch to the platform from other solutions: Rillet customers can independently choose the underlying artificial intelligence model for processing requests, including solutions from OpenAI or Anthropic.

The company emphasizes that the models are not trained on customer data and that one customer’s information is not used to process another customer’s data. To oversee automation, Rillet added a dedicated monitoring tool. It allows accountants to review every AI agent decision, see the metrics used, and understand exactly how the system performed its calculations. This level of oversight is especially important for multistep tasks that agents may carry out over extended periods.