Blue J, a generative AI platform transforming tax research, has secured $122m in Series D financing to scale its growth and innovation.
The latest funding 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.
Founded to simplify the complexities of tax law, Blue J uses generative AI to provide fast, accurate answers to complex tax queries. Its platform supports U.S. federal, state, and local tax research, alongside Canadian and UK tax law, enabling professionals to navigate high-stakes regulatory challenges with confidence.
With the new capital, the company plans to expand its team, accelerate product development, and extend its market presence. The funding follows a period of rapid growth, during which Blue J more than doubled both its revenue and customer base in the first half of 2025. The company now serves tens of thousands of professionals across thousands of organisations.
Blue J’s platform differs from traditional tax research tools by allowing users to pose questions in natural language. Its interface responds within seconds and includes source citations, making the tool particularly popular for its speed, ease of use, and reliability. Over 70% of users engage with the platform weekly, and the company reports a consistently high Net Promoter Score in the mid-70s.
Marc Manara, head of startups at OpenAI, said, “Blue J is a leading example of effective AI deployment in one of the most complex information domains. By leveraging OpenAI’s latest models, Blue J has elevated the standard for accuracy, trust, and insight in tax research. We’re excited to continue working together at the forefront of innovation.”
Oak HC/FT partner Allen Miller said, “Tax research has long been a cumbersome, time-consuming task. Blue J has solved this challenge with an elegant AI solution that dramatically accelerates research while raising the bar for accuracy. We believe Blue J will become the new standard for complex tax questions — and we’re proud to support Ben and the team in their next stage of growth.”
Sapphire Ventures partner Cathy Gao, who has joined Blue J’s board, added, “Blue J is exactly what we look for in vertical AI: deep domain expertise, proprietary data and a product that drives meaningful business impact. By applying generative AI to decades of tax rulings, Blue J reduces research that once took hours to just minutes. It’s already trusted by enterprise clients, embraced by top firms, and loved by many practitioners. We believe their momentum shows the industry is ready, and we’re proud to back Blue J as they build the operating layer for global tax cognition.”
Blue J CEO and co-founder Benjamin Alarie said, “We’re thrilled to partner with Sapphire Ventures, Oak HC/FT, Ten Coves, CPA.com, and Intrepid Growth Partners — firms with exceptional track records of backing market-defining companies. Their commitment is a powerful endorsement of our vision to transform tax research. With this capital and industry support, we will accelerate innovation and deliver even greater value to tax professionals. We are building the future of tax. This is just the beginning.”
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