Cécile Wickmann, chief customer officer, had the idea for Rebelle, a European online marketplace for luxury second-hand fashion items, while trying to solve a problem. She wanted to sell clothes and accessories she had accumulated from former jobs and while studying for an MBA. She and co-founder Max Schönemann launched Rebelle in Hamburg in 2013. In February this year, the firm made history as Nasdaq’s first green initial public offering.