One Madison Group

One Madison Group is a New York-based investment firm that deploys long-duration flexible capital across public and private markets, investing as principals through fundamental research. It participates in controlling stakes, minority co-investments and third-party managed investments, and has acted as a co-lead investor in later-stage venture rounds. The firm is relevant for U.S. growth-stage technology and industrial companies, with portfolio exposure across AI, semiconductors, robotics, automation, logistics, agtech/foodtech and space, including OpenAI, SpaceX and Plenty.