René Benko, the Austrian investor, is raising his indirect stake in Signa Holding to 92.5 percent by financing the bulk of a €485 million equity increase through the holding companies that he controls, according to Bloomberg and various Austrian media. Another shareholder, the Swiss-based investor Ernst Tanner, will see his minority share further diluted as he is only contributing €15 million to the capital increase. Signa Holding is the parent company of Signa Retail, which owns 100 percent of Galeria Karstadt Kaufhof, including Karstadt Sports, and Sport Scheck. It is also the major shareholder in Signa Sports United, which owns Tennis Point and other sports e-tailers. The equity increase was decided at the group’s annual meeting at the end of August. It should be completed by the end of September.