LUMU Invest Sàrl is a private investment company based in Luxembourg that focuses on investing in start-ups in the telecom sector. It typically invests between 50K€ to 200K€, taking an equity stake of 10-25% in companies. As an active investor, LUMU is involved in helping portfolio companies with marketing, selling, and accelerating business growth. It aims to exit investments within 2-3 years through company sales, share sales, or participating in later funding rounds. LUMU's current portfolio includes companies in mobile advertising, social music, and online TV widgets.