New Delhi, July 29 -- A major change to India's equity market structure is set to take effect from August 3, and Zerodha co-founder and CEO Nithin Kamath believes it will not only change how investors trade at the close of the market but could also dent the brokerage industry's revenues.

In a post on X, Kamath said the introduction of the Closing Auction Session (CAS) by the NSE and BSE for stocks with futures and options (F&O) contracts will make the trading day more complex for investors. He also acknowledged that the move could reduce Zerodha's brokerage income by 1% to 5%, while increasing the number of customer queries because different segments of the market will now close at different times.

"Now that broking is listed and people...