The National Stock Exchange (NSE) added Punjab National Bank (PNB) to its Futures and Options (F&O) ban list for Thursday after the scrips crossed 95% of the market-wide position limit. Thursday is the expiry day for monthly F&O contracts. Bharat Heavy Electricals Limited is already on the F&O ban list, surging more than 7% to ₹71.1 apiece on Tuesday.