Companies based in Dortmund

German music label specialised in progressive rock

German multinational variety store chain

thumb|A 9ff GT9-CS in 2012 9ff is a German car tuning company based in Dortmund. It was founded by Jan Fatthauer in 2001. It specializes in converting stock Porsches into street legal racing vehicles, either as fully tuned cars, or by selling individual parts or kits. The company is best known for building one of the first cars to exceed , the GT9, capable of . The former company, 9ff Fahrzeugtechnik GmbH, filed for bankruptcy in September 2013. A new company, 9ff Engineering GmbH was founded in October 2013.

German insurance company