Sept. 9 (Bloomberg) -- Deutsche Bank AG has approached investment banks to assess their interest in managing a stock sale to raise as much as 9 billion euros ($11.4 billion), said three people with knowledge of the discussions. Germanyâs biggest bank has yet to decide on the sale, said the people, who declined to be identified because the plans are confidential. The proceeds may be used to increase the bankâs stake in Deutsche Postbank AG and to meet rising regulatory capital requirements, the people said. Deutsche Bank has the option to increase its almost 30 percent stake in Bonn-based Postbank, which currently has a market value of 5.6 billion euros. Deutsche Bank Chief Risk Officer Hugo Banziger said in an investor presentation in June that the Frankfurt-based bank would only raise capital for acquisitions. http://noir.bloomberg.com/apps/news?pid=20601087&sid=aUIxOxM14LQ8&pos=1 Peanuts.