Asia's oldest exchange, BSE, traded far fewer derivatives contracts in the first week following the implementation of the Closing Auction Session (CAS). However, the contracts generated significantly higher premiums, helping the exchange sharply improve its premium turnover and gain market share, according to Nuvama Institutional Equities.Nuvama said the first week of CAS implementation appears to have curbed last-minute swings, fuelling flows into deep out-of-the-money options. This resulted...