Six stocks, including Delta Corp and L&T Finance, are under trading bans on May 22, owing to open interest levels crossing 95% of the market-wide limit. However, Future and Options contracts will still remain on the market. The ban will be reversed when open interest falls below 80%. Traders in indices won't face a security ban. Nifty50 closed higher and Sensex was up by almost 300 points, amidst which analysts predict the upcoming period to continue upward momentum.