Seven of the top-10 most valued companies in terms of market capitalisation saw their valuation erode by a whopping Rs 23,883 crore in October, with heavy weights like MMTC, Bharti Airtel and TCS witnessing significant decline.

However, country's largest private sector firm Reliance Industries and state run power utility NTPC and mining firm NMDC bucked the trend and saw their total market capitalisation (m-cap) increase by Rs 8,731.65 crore.