Lean Fund is a Belgian seed and early-stage investment fund managed by experienced entrepreneurs, based in Mont-Saint-Guibert, Walloon Brabant, Belgium (approximately 25 km south of Brussels, near the Louvain-la-Neuve university-and-research hub area). The firm was founded in 2013 and invests across Belgian / Walloon region technology and innovation-focused start-ups. The firm's name ''Lean Fund'' references the ''Lean Startup'' methodology popularised by Eric Ries, a thematic branding choice for an entrepreneur-led early-stage fund. Detailed public information including precise aggregate AUM in EUR denominations, named principals, Belgian Financial Services and Markets Authority (FSMA) regulatory-registration status, fund vintages, and comprehensive portfolio-company disclosures is partially documented in mainstream Belgian / Walloon regional-economy databases for this specific URL. The row should be noted as Active with limited comprehensive public disclosure.