The impact would be highest on high-volatility F&O stocks. Quite a few may go into the ban period since the MWPL will exceed 50 per cent in several instances. Counters such as NCC, Indiabulls Housing Finance, Jindal Steel & Power, Just Dial, Adani Enterprises, Canara Bank, etc. would likely be immediately placed in the ban period for derivatives trading. Some more stocks could also be impacted, depending on the trading pattern. This may affect roughly 10 per cent of the F&O stocks, according to estimates of market operators. Higher margins would also very likely lead to a reduction in non-delivery volumes in both F&O and cash segment.