Riot Ventures is a venture capital firm founded in 2017 by Stephen Marcus and Will Coffield, with offices in Los Angeles, California, and Boston, Massachusetts. The firm specializes in investing in deep technology sectors, including artificial intelligence, machine learning, robotics, security, mobility, and communications. Riot Ventures focuses on modernizing critical industries by supporting a select group of innovative companies, often with investments up to $100 million.

Their portfolio includes companies such as Oxide Computer Company, Desktop Metal, and Shield AI. Riot Ventures typically invests between $0.5 million and $10 million in early-stage and growth-stage companies across the United States. The firm is recognized as a Registered Investment Adviser and manages multiple funds, including Riot Ventures Fund I and Fund II, which aim to support innovations in technology and related fields.