Sebastien de Halleux

Investment Stage

Focus Areas

About Investor

Sebastien de Halleux is a Founding General Partner at Graph Ventures, based in San Francisco, California, United States, with extensive experience as an entrepreneur, angel investor, and venture capital professional. His investment focus spans AI, SaaS, Enterprise Software, FinTech, E-commerce, Marketplaces, DeepTech, Robotics, ClimateTech/CleanTech, TransportationTech, Education, and Consumer Internet. His investment activity primarily covers the Pre-seed and Seed stages, with selected investments extending into Series A, positioning him to support technology startups during their earliest phases of development and commercialization. According to his Signal investor profile, Sebastien typically invests between $100,000 and $250,000, with a preferred ticket of approximately $150,000. His investment history includes companies such as Kosmik, ClearSpace, MightyFly, SailPlan, neuroClues, and Formally, reflecting experience across software, aerospace, robotics, healthcare technology, and emerging industries. Available investor records do not establish that he consistently acts as a lead investor, although Graph Ventures has participated as a lead investor in selected transactions. Before his venture capital career, Sebastien co-founded Playfish, acquired by Electronic Arts, and held leadership roles at Saildrone, giving him substantial experience in building and scaling technology companies. Through Graph Ventures, he is positioned to support founders with fundraising, product development, business strategy, strategic partnerships, international expansion, and scaling early-stage technology businesses.