Grega has a strong and successful history with various start-ups in the manufacturing, food service, leisure, and fitness industry. In 2004 Grega opened his first company, specialized in the EU distribution and sales of sports nutrition, fitness and wellness products. After selling the company in 2010, Grega started a new company, Aioli Pharma Ltd, in 2011, which specialized in the production of its own brand functional chewing gums (chewing gum for energy, vitamin gum, anti-stress gum, etc.). Business model and products were successfully launched on the Slovenian, Croatian, and Austrian markets. The brand achieved great success – only a few months after penetrating the Slovenian market, the company covered more than 5% of the domestic gum market. Grega sold most of his share in the company to various investors in 2015.