TORONTO, September 16, 2025 – Thomson Reuters Corporation (“Thomson Reuters”) (TSX/Nasdaq: TRI), a global content and technology company, today announced it has acquired Additive. The San Francisco-based startup, founded in 2023, uses cutting-edge AI to automate tax document processing for tax and accounting professionals.
Additive’s GenAI-native platform streamlines the repetitive, time-consuming task of ingesting and parsing pass-through entity documents, including Schedule K-1 federal tax forms, during tax preparation workflows. This transaction complements Thomson Reuters existing tax workflow automation capabilities.
“In a profession under mounting pressure to do more with less—amid staffing constraints, rising client expectations, and compressed filing timelines—driving greater efficiency is imperative. Schedule K1s are among the most labor-intensive forms tax professionals handle. We’re delighted to bring our customers critical K1 ingestion capabilities with Additive to save time while maintaining high accuracy,” said Elizabeth Beastrom, President of Tax and Accounting Professionals at Thomson Reuters. “AI-powered solutions are the future of the profession, and Additive’s solution helps professionals focus their time where judgment matters most—reclaiming capacity, elevating advisory work, and delivering faster, with confidence.”
“From day one, our mission at Additive has been to remove the friction that keeps tax and accounting professionals from doing their best work,” said Dwight Crow, Chief Executive Officer and co-founder of Additive. “As part of Thomson Reuters, we can now put our AI-powered document processing capabilities in the hands of many more firms, faster. Together, we’ll accelerate our vision, and leverage Thomson Reuters scale.”
Thomson Reuters
Thomson Reuters (TSX/Nasdaq: TRI) informs the way forward by bringing together the trusted content and technology that people and organizations need to make the right decisions. The company serves professionals across legal, tax, accounting, compliance, government, and media. Its products combine highly specialized software and insights to empower professionals with the data, intelligence, and solutions needed to make informed decisions, and to help institutions in their pursuit of justice, truth, and transparency. Reuters, part of Thomson Reuters, is a world leading provider of trusted journalism and news. For more information, visit tr.com.
About Additive
Additive empowers accountants in the asset and wealth management industry with AI tools that transform tax return preparation. The company’s technology automates complex tasks such as extracting footnotes from K-1s, K-3s, and related forms, so every staff member can become a reviewer and complete work that used to take weeks in a matter of hours. For more information, visit additive.ai.
CONTACTS
MEDIA
Kirsty Bennett
Communications Director, Tax and Accounting Professionals
+44 7786 005 128
kirsty.bennett@thomsonreuters.com
INVESTORS
Gary E. Bisbee
Head of Investor Relations
+1 646 540 3249
gary.bisbee@thomsonreuters.com