Hartmutson is an investment advisory firm located in Frankfurt am Main, Germany founded by Attila Gelfert and Madelaine von Sturm zu Vehlingen in 2016. It manages a single investment strategy (The Hartmutson Portfolio) for partners through a wikifolio index fund.

The Hartmutson Portfolio is a fundamental, long-only, public equity investment strategy. Its goal is to provide returns above the general market over the long-term by investing capital of investors who think like an owner in a concentrated number of great businesses run by great managers. Opportunities are difficult to find, so if a business meets our characteristics the Portfolio will take fairly concentrated positions in its highest conviction ideas, typically holding 10-15 companies.