Stephen Mackintosh
Stephen Mackintosh is the Co-Founder and General Partner of Karatage, a London-based hedge fund specializing in digital assets, blockchain, and emerging technology investments. He focuses on identifying and supporting high-growth blockchain and digital asset projects with strong market potential. Mackintosh brings extensive experience in artificial intelligence and deep tech, having previously served as Chief Commercial Officer at Re:infer, a UCL AI research spinout recognized by Gartner as a "Cool Vendor" in natural language processing. His expertise combines deep technical knowledge with strategic investment insights, positioning him to guide innovative projects in the evolving digital economy.
Stephen Mackintosh Professional Experience / Academic History
Professional Experience
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Co-Founder and General Partner
Academic History
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B.S., Economics
At Karatage, Mackintosh focuses on identifying and supporting high-growth projects in blockchain and digital assets.
He played a pivotal role in the firm’s early investment in the Sui ecosystem and serves as Chief Investment Officer of Mill City Ventures, guiding its strategic shift toward a SUI treasury strategy and integration of blockchain and AI technologies.
He manages a diverse portfolio of private investments, including Mysten Labs, Animoca Brands, Plasma, Ton, and funds such as Robot Ventures, Bitkraft, Parafi, Kingsway, and Multicoin Capital.
EARLY CAREER
Mackintosh began his entrepreneurial journey at age 22, founding his first company while at University College London.
Before Karatage, he led the growth of Re:infer, an award-winning AI company recognized as a global leader in natural language processing.
He also served as a tech advisor at Trackmatic and RESOLVE, a specialist finance firm, and gained experience investing in public and private markets with a focus on SaaS and machine learning.
MEDIA & PUBLICATIONS
Mackintosh has been featured in leading outlets including BusinessWire, Yahoo! Finance, The Block, and Real Vision.