Bharat Heavy Electricals (BHEL), Gujarat Narmada Valley Fertilizers and Chemicals (GNFC), Manappuram Finance and Canara Bank are the four stocks being placed under F&O ban on Thursday, with contracts banned when open interest exceeds 95% of market-wide positions limits. The ban is only lifted when open interest falls below 80%. Although under F&O ban, the stocks will remain available for trading in the cash market and are said to be experiencing volatile trading within normal ranges.