Rillet raises $70M Series B co-led by a16z and Iconic to replace legacy ERP for SaaS companies
Aug 6, 2025 with Nicolas Kopp
Key Points
- Rillet closes $70M Series B co-led by Andreessen Horowitz and Iconic just 12 weeks after Series A, signaling investor conviction in its AI-native ERP displacement strategy.
- Seventy percent of Rillet's customer base migrates from QuickBooks and Xero, while 30% displace NetSuite and Sage Intacct, proving traction across both spreadsheet-to-ERP and mid-market replacement deals.
- Rillet deploys capital toward upmarket expansion and customer success scaling rather than downmarket or multi-product moves, prioritizing enterprise logos in accounting software.
Summary
Rillet closed a $70 million Series B co-led by Andreessen Horowitz and Iconic, announced August 6, 2025. The round follows a Series A completed just 12 weeks earlier, an unusually compressed fundraising cadence that signals aggressive investor conviction in the company's trajectory.
Founded roughly three and a half years ago by Nick (CEO, accounting and finance background), Rillet spent most of its early life in stealth building a full ERP system before emerging publicly approximately one year ago. The company positions itself as an AI-native replacement for legacy mid-market accounting infrastructure, targeting the segment dominated by NetSuite, Sage Intacct, QuickBooks, and Xero.
Customer acquisition splits roughly 70/30 by origin. Seventy percent of customers migrate from QuickBooks and Xero, while 30% are ripping out NetSuite and Sage Intacct. That mix confirms Rillet is winning both upgrade-from-spreadsheet deals and genuine displacement of established mid-market ERPs. Windsurf is cited as a marquee customer, described as one of the fastest-growing AI companies in recent history.
The product thesis centers on native integrations that pull upstream data into the platform, with AI automation layered on top to produce financial reporting. Rillet's approach to AI is deliberately dual-track. Background automation handles routine workflows, but human-in-the-loop review is retained for mission-critical processes, a deliberate concession to the risk tolerance of controllers, accountants, and CFOs. For executives and investors, a clean query interface surfaces answers without requiring manual interaction with underlying accounting logic.
On non-GAAP metrics, a meaningful differentiator for SaaS businesses, Rillet lets users define custom metrics like ARR through the UI in a repeatable, codified way. LLM-driven workflows can interpret chart-of-accounts structures and historical transactions to assist with classification, though the company acknowledges human oversight remains necessary for reliability at this stage.
Capital deployment will prioritize product expansion, moving upmarket to capture larger enterprise logos, and scaling customer success and onboarding teams to absorb existing demand. Rillet is not moving downmarket or pursuing multi-product expansion in the near term.