Rillet Secures $70M Series B to Scale AI Accounting Platform

Rillet, a San Francisco-based AI-native ERP and accounting platform, has secured $70 million in Series B funding, co-led by Andreessen Horowitz (a16z) and ICONIQ Capital, with additional participation from Sequoia Capital and Oak HC/FT [1]. This brings the company’s total funding to over $100 million in under a year, following a $25 million Series A round in May 2025 [2]. The round marks a significant institutional vote of confidence in Rillet’s mission to modernize financial systems through AI-driven automation.

The funding will be used to scale Rillet’s AI-native ERP solution and expand its market reach [2]. The company has already demonstrated rapid growth, with over 200 enterprise clients since its launch in 2024 and a doubling of its annual recurring revenue in the past 12 weeks [3]. Strategic partnerships with major accounting firms, including Armanino and Wiss, further underline its expanding influence in the finance sector.

Rillet’s platform is designed to replace traditional 20th-century accounting software with AI-powered automation, enabling streamlined financial processes for SaaS and high-growth companies [2]. Notable clients, such as PostScript and Windsurf, have already leveraged Rillet’s system to significantly improve their financial operations. PostScript, a $100 million ARR company, closed its books in just three days using Rillet, while Windsurf operates its full finance function with a two-person team [4]. These early successes highlight the platform’s potential to redefine finance and accounting workflows in the digital era.

With the new funding, Rillet is also strengthening its leadership. Alex Rampell and Seth Pierrepont, both general partners from a16z and ICONIQ, are joining the company’s board [5]. Their involvement underscores the strategic importance of Rillet in the AI and SaaS ecosystem and aligns with broader industry trends toward AI-enhanced enterprise software [6].

The Series B round reflects a larger shift in financial infrastructure, where AI is increasingly viewed as a core component of modern business operations [6]. Rillet’s focus on automation and AI positions it as a key player in a rapidly evolving market. As enterprise finance systems continue to digitize, Rillet’s approach could signal a long-term transformation in how companies manage their financial data [6].

[1] Rillet raises $70M Series B from Andreessen Horowitz and ... https://www.rillet.com/blog/rillet-raises-70m-series-b-from-andreessen-horowitz-and-iconiq

[2] AI accounting startup Rillet raises $70 million in ... https://www.reuters.com/technology/ai-accounting-startup-rillet-raises-70-million-andreessen-horowitz-iconiq-led-2025-08-06/

[3] AI startup Rillet secures $70M Series B led by a16z ... https://cryptobriefing.com/ai-startup-rillet-70m-funding-a16z/

[4] Rillet secures $70M to expand AI accounting platform https://www.wfla.com/bloom-tampa-bay/bloom-financial-health/rillet-secures-70m-to-expand-ai-accounting-platform/

[5] AI Startup Rillet Raises $70M Series B, Valued at $500M https://www.webpronews.com/ai-startup-rillet-raises-70m-series-b-valued-at-500m/

[6] AI accounting startup Rillet raises $70M in funding led by ... https://techstartups.com/2025/08/06/ai-accounting-startup-rillet-raises-70m-to-take-on-oracle-and-microsoft/