REUTERS - Mar 27 - Shares in ProSiebenSat.1 Media rallied by 9% on Friday after the departure of CEO Max Conze. ProSieben announced that Conze was leaving with immediate effect and CFO Rainer Beaujean would assume his responsibilities. Conze had sought to accelerate a pivot to digital commerce and advertising to offset a relentless decline in ProSieben's core commercial TV franchise, but while this preserved top-line growth it squeezed profitability and pushed up debt. The recent announcement of the $500M takeover of The Meet Group incurred the disapproval of Italian broadcaster Mediaset, which took advantage of a precipitous decline in ProSieben's share price to up its stake to 20%. Mediaset wanted ProSieben to change course and concentrate on its core media business. Analysts at Citi said it was possible that Mediaset could partner with Czech investor Daniel Kretinsky, who owns a 10% stake in ProSieben, to make a takeover bid.