Thirteen stocks, including Balrampur Chini, Bandhan Bank, Chambal Fertilizers, Escorts Kubota, Hindustan Copper, Indian Energy Exchange (IEX), The India Cements, Indus Towers, National Aluminium Company, Piramal Enterprises, PVR Inox, and Steel Authority of India (SAIL), were under the F&O ban list. Zee Entertainment Enterprises (ZEEL) is back on the ban list, while Delta Corp and Gujarat Narmada Valley Fertilizers (GNFC) have moved out. The F&O contracts of any stock enter the ban period when the open interest (OI) on it crosses 95% of the market wide positions limits or MWPL. The ban on it is reversed only if the open interest falls below 80%. Traders who trade in indices do not encounter a situation of security ban.