Renzo Rosso buys Marni stake to boost multi-band conglomerate plans Rosso, the millionaire founder of Diesel, dreams of creating a successful multibrand fashion empire under his holding company Only the Brave. So, the rumours were true: Renzo Rosso has acquired a majority stake in Milan Fashion Week label Marni. Promising to provide "new energies and resources to add brilliance to the label," Rosso will act as co-CEO of the label with founder Gianni Castiglioni while Consuelo Castiglioni (Gianni's wife) remains as creative director. READ: Diesel founder to buy Marni? But the 57-year-old entrepreneur's plans don't stop there. The Diesel founder has revealed his desire to create a multibrand conglomerate "with a fresh vision - farsighted, contemporary and recognisable," he told WWD . This dream is not far from being a reality; through his holding company Only the Brave Srl, Rosso already controls Paris Fashion Week labels Maison Martin Margiela and Viktor & Rolf and Italian-based Staff International, which manufacturers collections for Vivienne Westwood Red Label and Man, Marc Jacobs Men, Dsquared2 and Just Cavalli.