Supio Raises $60M Series B With Backing From Thomson Reuters Ventures, Sapphire Ventures, And Mayfield To Accelerate AI Adoption In Legal Industry

Seattle-based legal tech startup Supio raised $60 million in a Series B funding round, aiming to enhance its AI-powered platform tailored for personal injury and mass tort law firms.

The startup recently announced that the round was led by Sapphire Ventures, with participation from Mayfield and Thomson Reuters Ventures, bringing Supio’s total funding to $91 million. The company previously raised $25 million in a Series A round in 2023, GeekWire reports.  According to Supio, the funds will be used to scale engineering and product teams, expand marketing efforts, and further refine their platform's AI capabilities.

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An AI That Understands the Complexity of Legal Documents

Supio's software is designed to help plaintiff-side law firms organize, filter, and analyze large volumes of unstructured data such as medical records, legal filings, and client communication, TechCrunch reports. The system applies specialized AI models to extract key information, flag inconsistencies, and structure timelines, processes that traditionally require hours of manual paralegal work.

“Our growth since Series A confirms what we've believed all along — that specialized AI built for personal injury and mass tort law can transform how these practices operate,” CEO Jerry Zhou said in the company’s statement.

Supio said its AI has been adopted by several large firms including Hughes & Coleman, Daniel Stark, Whitley Law, and Thomas Law Offices. While exact usage metrics weren’t shared, the company reported a four-times increase in annual recurring revenue since August.

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Strategic Growth and Legal Industry Validation

Thomson Reuters Ventures' participation in Supio's Series B reflects a targeted approach to investing in companies that align with its core markets and long-term strategy. "In the legal industry, personal injury and mass tort litigation demand specialized AI solutions designed specifically for these complex practice areas, and Supio addresses these unique challenges with both accuracy and depth," Tamara Steffens, managing director at Thomson Reuters Ventures, said in Supio's funding announcement. She added that the firm sees Supio's purpose-built platform as a critical tool for law practices aiming to improve case efficiency and outcomes at scale.

According to TechCrunch, Supio plans to double its 100-person team. Key executive hires include former Avalara executive Jay Deubler to lead sales, former Highspot VP Gwen Sheridan to oversee customer success, and former Vanilla marketing chief Jim Sinai as Supio's new chief marketing officer, GeekWire writes.

Rajeev Dham, partner at Sapphire Ventures and a Supio board member, said in a statement, “We believe their exponential growth demonstrates that law firms are embracing AI tools that deliver measurable advantages in case preparation and outcomes.”

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A Legal Tech Ecosystem on the Rise

Supio joins a growing ecosystem of AI-driven legal startups across the Pacific Northwest, including Clearbrief, Predict.law, SingleFile, Theo AI, and Paxton. But while many of these players are building tools for general litigation or e-discovery, Supio is focusing exclusively on the plaintiff bar, particularly firms managing thousands of clients in high-stakes tort cases, as reported by GeekWire.

The company was co-founded in 2021 by Zhou and Kyle Lam, childhood friends who previously launched a mobile gaming app and later worked together at Microsoft MSFT and Avalara, according to GeekWire. 

Supio's trajectory is set to serve as a case study for how AI can reshape legal workflows by automating routine tasks, and by redefining how plaintiff-side law firms handle complex litigation.

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