The round was co-led by Andreessen Horowitz and ICONIQ with participation from Sequoia, Oak HC/FT and earlier investors. In conjunction with the new funding, Andreessen Horowitz General Partner Alex Rampell and ICONIQ General Partner Seth Pierrepont are joining the board.

This round comes just 10 weeks after Rillet announced a $25m Series A round from Sequoia, the company has now raised over $100 million in under a year. Since launch, Rillet has signed over 200 customers and doubled its ARR over the past 12 weeks. The rapid growth has also resulted in strategic partnerships with many of the nation's top accounting firms like Armanino (top 20) and Wiss (top 50).

Rillet is the AI-native accounting platform made to tailor fit the workflows of accountants and a full replacement for legacy ERPs. Scaling and hyper-growth companies like Windsurf, Bitwarden and Decagon use Rillet to enable a smarter close with native integrations, automated journal entries and AI embedded workflows.