AI-native accounting startup Rillet has raised $100 million in an unplanned Series C funding round led by Iconiq, reaching a $1 billion valuation in just 48 hours. The two-year-old startup has doubled its annualized revenue run rate and now serves over 600 customers, including Neuralink and Mercor. Rillet's agent-first platform is actively displacing legacy ERP systems from giants like Oracle and NetSuite, helping businesses navigate a severe shortage of accounting talent by automating routine data entry.
Rillet Series C funding round
- ▪The AI-native accounting startup Rillet announced a $100 million Series C funding round at a $1 billion valuation.
- ▪Rillet's Series C funding round was led by Iconiq, with participation from Sequoia Capital, Andreessen Horowitz, Oak HC/FT, Bain Capital Ventures, Sequoia Global Equities, Battery Ventures, FirstMark, Scale Venture Partners, and Creandum.
- ▪The Series C funding round brings Rillet's total funding raised to over $200 million since emerging from stealth mode two years prior.
- ▪Seth Pierrepont, a general partner at Iconiq who led the Series C round, joined Rillet's board of directors.
AI-native accounting platform features
- ▪Rillet's platform allows customers to route requests to their choice of foundational AI models, such as OpenAI or Anthropic, while preventing those models from training on proprietary customer data.
- ▪Rillet features a governance and monitoring tool released around May 2026 that allows accountants to review and audit every decision, metric, and calculation made by the AI agents.
- ▪Rillet maintains deterministic accounting data alongside its AI systems and keeps detailed logs of agent steps to ensure auditability.
Legacy ERP system displacement
- ▪According to Rillet CEO Nicolas Kopp, approximately 50% of Rillet's customers migrated from Intuit, 30% from NetSuite and Sage Intacct, and 20% from Oracle, SAP, Workday, and Microsoft products.
- ▪Rillet is designed to replace legacy enterprise resource planning (ERP) and accounting systems from established providers such as Oracle, SAP, NetSuite, Intuit, Sage Intacct, Workday, and Microsoft.
- ▪Rillet has established an alliance with EY to provide AI-native finance transformation with built-in risk management and controls, and partners with more than half of the top 20 U.S. CPA firms.
Accounting workforce transformation
- ▪A study by Stanford and MIT found that accountants using generative AI supported 55% more clients per week, shifted 8.5% of their time away from routine data entry, and closed monthly books 7.5 days faster.
- ▪A Controllers Council Organization report found that 61% of finance leaders struggled to find finance, accounting, and CPA talent in the year leading up to August 2026.
- ▪The U.S. Bureau of Labor Statistics projects that employment of bookkeeping, accounting, and auditing clerks will decline 6% between 2024 and 2034 due to software automation.
- ▪The U.S. Bureau of Labor Statistics projects that demand for accountants and auditors will grow by at least 5% by 2034, adding 72,800 jobs, with AI shifting their focus toward advisory and analytical duties.
Customer growth metrics
- ▪The AI-hiring startup Mercor uses Rillet to manage its finance operations for a business scaling past $2 billion in annual recurring revenue with a finance team of only three people.
- ▪Rillet doubled its annualized revenue run rate in the quarter leading up to its August 2026 Series C funding round.
- ▪Rillet serves more than 600 customers, including high-profile AI companies such as Neuralink, Skild AI, and Mercor, alongside non-tech businesses which make up roughly 40% of its customer base.
Rapid unicorn valuation timeline
- ▪Rillet was not actively seeking to raise capital when the Series C round came together, but existing investors accelerated negotiations after reviewing the company's recent growth metrics.
- ▪Rillet secured its $100 million Series C funding round and reached a $1 billion valuation within a 48-hour window following a routine board meeting.
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