Blue J Secures $122M Series D for AI Tax Research

Blue J raised $122 million in Series D funding led by Oak HC/FT and Sapphire Ventures to expand its AI-powered tax research platform.

Funding Details and Growth Metrics

The Series D round was led by Oak HC/FT and Sapphire Ventures, with participation from Intrepid Growth Partners and existing investors Ten Coves Capital and CPA.com. This funding follows Blue J's Series C round completed just seven months earlier in December 2024.

Blue J more than doubled its revenue and customer base in the first half of 2025. The company now serves tens of thousands of tax professionals across thousands of organizations. Over 70% of users log in weekly, and the platform maintains a Net Promoter Score consistently in the mid-70s.

Since January 2025, Blue J has grown to over 80 employees and more than doubled its rate of new customer acquisition.

AI-Powered Tax Research Platform

Blue J's platform uses generative AI to answer complex tax questions across US federal, state, local, Canadian, and UK tax law. The system operates on a curated database of authoritative tax law and learns from millions of user queries annually.