Blue J doubles revenue and customer base in first half of 2025, delivering comprehensive tax research to tens of thousands of tax professionals

Blue J, a leading GenAI tax research platform, today announced it has raised $122 million in U.S. dollars in a Series D funding round led by Oak HC/FT and Sapphire Ventures, with participation from Intrepid Growth Partners, and previous investors Ten Coves Capital and CPA.com. Coming seven months after Blue J’s Series C round, this investment signals a clear market consensus that Blue J is the breakout winner in its category.

“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,” said Benjamin Alarie, CEO and co-founder of Blue J. “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.”

“Tax research has long been a cumbersome, time-consuming task,” said Allen Miller, Partner at Oak HC/FT. “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.”

“Blue J is exactly what we look for in vertical AI: deep domain expertise, proprietary data and a product that drives meaningful business impact,” said Cathy Gao, Partner at Sapphire Ventures and Blue J’s newest board member. “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’s platform leverages advanced generative AI to deliver instant, reliable answers to complex tax questions spanning U.S. federal, state, and local tax (SALT), as well as Canadian and UK tax law. Built on a rigorously curated database of authoritative tax law, Blue J’s system continuously improves by learning from millions of user queries each year. The result: practitioners can navigate even the most challenging tax issues with unmatched confidence and speed.

Unlike legacy keyword-based research tools, Blue J lets users ask tax questions conversationally, with no arcane syntax required. The intuitive interface delivers answers in seconds, complete with relevant source citations, making Blue J the industry’s most user-friendly tax research platform. More than 70% of users log in weekly, and Blue J’s Net Promoter Score (NPS) is consistently in the mid-70s.

In the first half of 2025, the company more than doubled its revenue and customer base, now serving tens of thousands of tax professionals across thousands of organizations that rely on Blue J for authoritative tax research, analysis, and answers. With the Series D funding, Blue J will further accelerate team expansion, product development, and market reach.

The company has proudly earned recognition from other generative AI leaders. “Blue J is a leading example of effective AI deployment in one of the most complex information domains,” said Marc Manara, Head of Startups at OpenAI. “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.”

This Series D follows Blue J’s December 2024 Series C and comes during a period of rapid acceleration for the company. Since January 2025, Blue J has grown to over 80 employees and more than doubled its rate of new customer acquisition. With this new investment and market momentum, Blue J is poised to set the new standard for AI-driven tax research as global tax complexity continues to rise.

About Blue J

Founded in 2015, Blue J is redefining tax research with generative AI. Trusted by tax professionals across accounting firms, law firms, corporations, and government, Blue J delivers fast, verifiable analysis and answers to even the most complex tax questions — empowering experts to serve with clarity and confidence. With an intuitive conversational interface and a rigorously curated library of authoritative sources, Blue J is transforming how tax professionals work and make decisions. Leading organizations trust Blue J to streamline their research workflow and enhance decision-making accuracy. For more information, visit www.bluej.com.

About Oak HC/FT

Oak HC/FT is a venture and growth equity firm specializing in investments in fintech and healthcare. Using partnership as a foundation, Oak HC/FT guides companies and founders at every stage, from seed to growth, to create businesses that make a measurable and lasting impact. Founded in 2014, Oak HC/FT has invested in over 105 portfolio companies and has over $5.3 billion in assets under management. Oak HC/FT is headquartered in Stamford, CT, with an office in San Francisco, CA. Follow Oak HC/FT on LinkedIn and X and learn more at https://www.oakhcft.com/.

About Sapphire

Sapphire is a global software venture capital firm with over $11 billion in AUM and team members across Austin, London, Menlo Park and San Francisco. For more than two decades, Sapphire has partnered with visionary management teams and venture funds to back companies of consequence. Since its founding, Sapphire has invested in more than 170 companies globally resulting in more than 30 Public Listings and 45 acquisitions. The firm’s investment strategies — Sapphire Ventures, Sapphire Partners and Sapphire Sport — are focused on scaling companies and venture funds, elevating them to become category leaders. Sapphire’s Portfolio Growth team of experienced operators delivers a strategic blend of value-add services, tools and resources designed to support portfolio company leaders as they scale.

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"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." Benjamin Alarie, CEO and co-founder of Blue J