Blue J, a leading generative AI tax research platform, announced on August 4, 2025, a $122 million Series D funding round led by Oak HC/FT and Sapphire Ventures, with participation from Intrepid Growth Partners, Ten Coves Capital, and CPA.com. This investment, following a Series C round just seven months prior, underscores Blue J’s position as a market leader in transforming tax research for professionals worldwide.
Funding: $122M Series D led by Oak HC/FT and Sapphire Ventures.
Growth: Doubled revenue and customer base in H1 2025, serving tens of thousands of tax professionals.
Technology: Conversational AI platform for U.S., Canadian, and UK tax law research.
User Engagement: Over 70% weekly logins, mid-70s Net Promoter Score (NPS).
Plans: Expand team, enhance product development, and grow global market reach.
Recognition: Praised by OpenAI for effective AI deployment in tax research.
Blue J’s platform uses advanced generative AI to provide instant, accurate answers to complex tax questions across U.S. federal, state, local, Canadian, and UK tax law. “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.” Unlike legacy keyword-based tools, Blue J’s conversational interface delivers answers in seconds with source citations, simplifying complex tax navigation.
In H1 2025, Blue J doubled its revenue and customer base, now supporting tens of thousands of tax professionals across thousands of organizations. With over 70% of users logging in weekly and a consistent NPS in the mid-70s, the platform is highly valued for its user-friendly design. “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.
The $122M will accelerate Blue J’s team expansion, product development, and global market reach. “With this capital and industry support, we will accelerate innovation and deliver even greater value to tax professionals,” said Benjamin Alarie, CEO and co-founder of Blue J. The company’s curated database of tax rulings, enhanced by millions of user queries, ensures continuous improvement in accuracy and speed.
Blue J’s integration with OpenAI’s latest models has earned accolades from industry 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. With partnerships like CPA.com and adoption by top firms, Blue J is setting a new standard for AI-driven tax research amidst rising global tax complexity.
Blue J’s Series D funding solidifies its leadership in AI-driven tax research, empowering tax professionals with faster, more accurate solutions. With strong investor backing and market momentum, Blue J is poised to redefine the future of tax research globally.
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.
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.
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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