Blue J secures USD $122 million Series D to expand its generative AI tax research platform, accelerating growth across North America and beyond.
Toronto’s Blue J has raised USD $122 million in a Series D funding round, cementing its position as a market leader in generative AI–powered tax research. The round was led by Oak HC/FT and Sapphire Ventures, with participation from Intrepid Growth Partners, Ten Coves Capital, and CPA.com.
The investment comes just seven months after Blue J’s Series C, underscoring what investors see as clear momentum. “Their commitment is a powerful endorsement of our vision to transform tax research,” said Benjamin Alarie, CEO and co-founder of Blue J. “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.”
Founded in Toronto, Blue J’s platform applies generative AI to decades of tax rulings across U.S., Canadian, and UK tax law. Unlike legacy keyword-based systems, the platform allows practitioners to ask questions conversationally and receive instant, authoritative answers complete with source citations. More than 70% of users log in weekly, and the product maintains a Net Promoter Score in the mid-70s.
“Blue J has solved this challenge with an elegant AI solution that dramatically accelerates research while raising the bar for accuracy,” said Allen Miller, Partner at Oak HC/FT. “We believe Blue J will become the new standard for complex tax questions.”
Sapphire Ventures Partner Cathy Gao, who will join Blue J’s board, called the company a model for vertical AI. “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.”
Blue J’s growth has been rapid: the company more than doubled its revenue and customer base in the first half of 2025, now serving tens of thousands of tax professionals across thousands of organizations. Its user base continues to expand among enterprise clients, top firms, and practitioners navigating complex tax environments.
OpenAI’s Head of Startups, Marc Manara, praised Blue J as a leader in applied AI: “By leveraging OpenAI’s latest models, Blue J has elevated the standard for accuracy, trust, and insight in tax research.”
With its Series D funding, Blue J plans to expand its team, scale product development, and extend market reach. The company has grown to over 80 employees since January and is poised to set a new standard for AI-driven tax cognition as global tax complexity rises.