Sean O'Sullivan

Sean O'Sullivan is the founder and Managing Partner at SOSV, a global venture capital firm based in New York, United States. As a veteran serial entrepreneur and institutional investor, he oversees a multi-stage investment platform that currently manages more than $1 billion in total assets under management. Under his direct leadership, SOSV operates several prominent startup accelerator programs worldwide, including the hardware-focused HAX Accelerator and the software-driven Chinaccelerator. These specialized initiatives target pre-seed and seed-stage investments, allowing the venture firm to successfully back hundreds of early-stage companies across multiple continents. His investment strategy targets diverse emerging technology sectors, consistently allocating early capital toward artificial intelligence, robotics, biotechnology, and climate tech startups. O'Sullivan maintains a primary focus on identifying deep tech opportunities and providing hands-on company-building support to founders navigating complex global hardware and software markets.