The Tehran Stock Exchange has begun today offering derivatives based on Iranian banks to diversify its market and attract foreign investors. The exchange is introducing six futures contracts on two banks, Managing Director Hassan Ghalibaf-Asl told Bloomberg in an interview. The contracts, based on Parsian Bank and Karafarin Bank, will expire in two, four and six months. The exchange said it hopes to increase the number of companies covered by futures contracts to at least 10 by March.