Sebastien de Halleux is the Founding General Partner at Graph Ventures. See portfolio, sector focus and contact routes.
Sebastien de Halleux is the Founding General Partner at Graph Ventures, a global early-stage fund with over 300 portfolio companies, and brings 25 years of experience as a technology entrepreneur who previously co-founded Playfish and worked at Nokia Ad Service. His investment thesis targets early-stage companies at the pre-seed and seed stages across sectors including Enterprise Applications, HealthTech, AI, climate tech, and gaming, with a geographic focus on the United States and global expansion opportunities. Typical check sizes for Graph Ventures range from $5K to $5M, with pre-seed investments of $5K–$500K and seed investments of $500K–$2M, though specific lead or follow behavior for de Halleux individually is not publicly detailed. Notable portfolio companies include Playfish (acquired by Facebook), Glu Mobile (formerly Macrospace, now part of larger entities), and companies acquired by Microsoft, reflecting his track record in social gaming and mobile technology. De Halleux distinguishes himself as a serial entrepreneur-operator who provides strategic guidance on product, growth, and fundraising, embodying Graph Ventures’ philosophy of being “an ear
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