Rillet secures $100M Series C at a $1 billion valuation

AI accounting startup Rillet has raised a $100 million Series C at a $1 billion valuation, just two years after emerging from stealth in 2024. Iconiq led the financing, while Andreessen Horowitz and Sequoia returned as investors. Rillet says it has now raised more than $200 million in total.

The company builds software that uses AI to help finance professionals manage corporate books. Its product can automatically and continuously bring in data from systems including Salesforce and Brex, positioning the general ledger as a more active part of finance operations.

Rapid growth behind an unplanned round

Co-founder and CEO Nicolas Kopp said on X that Rillet had not intended to raise capital, but the latest round came together in less than 48 hours. He pointed to developments since the previous financing, including an alliance with EY as well as growth in annual recurring revenue and customer numbers.

Rillet reports more than 600 customer companies and says it doubled ARR during the past three months. The company did not disclose an ARR figure, so the reported increase cannot be independently translated into a revenue total.

Its previous round was a $70 million Series B last year, led by Iconiq and Andreessen Horowitz. Before that financing, Rillet announced a $25 million Series A led by Sequoia.

AI pressure on finance software

Iconiq general partner Seth Pierpont said the firm had backed Rillet’s view that the general ledger could develop from a system of record into an operating system for finance. The new valuation and funding follow growing investor attention to AI companies targeting established enterprise software categories.

That pattern is also visible in infrastructure markets, where accelerating neocloud market for AI reflects the accelerating neocloud market for AI and the large financing rounds surrounding AI platforms. In Rillet’s case, the focus is enterprise resource planning and the finance workflows traditionally served by legacy SaaS products such as NetSuite.

What finance teams should assess

For businesses, the funding does not by itself establish that AI accounting tools are ready to replace existing financial systems. It does show that investors are placing substantial bets on products that connect operational data sources with bookkeeping processes and automate work for finance teams.

Finance leaders evaluating these tools can focus on the quality of integrations with their existing systems, the continuity of data flows, and how automation fits established controls. Rillet’s raise is a practical reminder that AI-led finance platforms are attracting capital while competing to become part of the core accounting stack.