organisation Borussia Dortmund GmbH & Co. KGaA. This corporation model has two types of participators: at least one partner with unlimited liability and at least one partner with limited liability. The investment of the latter is divided into stocks. The organisation Borussia Dortmund GmbH is the partner with unlimited liability and is responsible for the management and representation of Borussia Dortmund GmbH & Co. KGaA. Borussia Dortmund GmbH is fully owned by the sports club, Borussia Dortmund e.V. This organizational structure was designed to ensure that the sports club has full control over the professional squad. The stock of Borussia Dortmund GmbH & Co. KGaA was floated on the stock market in October 2000 and is listed in the General Standard of Deutsche Börse AG. Borussia Dortmund GmbH & Co. KGaA became the first and so far the only publicly traded sports club on the German stock market. 5.53% of Borussia Dortmund GmbH & Co. KGaA is owned by the sports club, Borussia Dortmund e.V.; 9.33% by Bernd Geske; and 59.93% widely spread shareholdings. Hans-Joachim Watzke is the CEO and Thomas Treß is the CFO of the GmbH & Co. KGaA. Michael Zorc as sporting director is responsible for the first team, the coaching staff, the youth and junior section, and scouting. The supervisory board consists, among others, of politicians Werner Müller and Peer Steinbrück. Borussia Dortmund e.V. and Borussia Dortmund GmbH & Co. KGaA's economic indicators reveal that BVB will be generating revenue of €305 million (US$408 million) from September 2012 to August 2013. According to the 2015 Deloitte's annual Football Money League, BVB generated revenues of €262 million during the 2013–14 season. This figure excludes player transfer fees, VAT and other sales-related taxes. Current management and board Kits and sponsorship Dortmund's main advertising partner and current shirt sponsor is Evonik. The insurance company Signal Iduna purchased the rights to name the Westfalenstadion Signal Iduna Park until 2021. The main equipment supplier is Puma since the 2012–13 season. The contract is currently valid. The club announced a deal with Opel to be the first-ever sleeve sponsor from the 2017–18 season. In addition, there are three different levels of partners: BVBChampionPartner includes among others Opel, bwin, Brinkhoff's, Wilo, Hankook and EA Sports; BVBPartner includes among others MAN, Eurowings, Coca-Cola, Ruhr Nachrichten, REWE and Aral; and BVBProduktPartner includes among others ofo, Westfalenhallen and TEDi. Since 2012, Brixental in the Kitzbühel Alps