MUMBAI, Oct 22: The National Stock Exchange today approved the requests from five trading members who desired to surrender their trading membership. The five trading members, Videocon Industrial Finance, Mardia Securities, Nath Securities, Palkhi Investments & Trading Company and Sea Horse Securities surrendered their membership to the NSE and it decided to accept their request with effect from October 23, 1997. These trading members would not be eligible to reapply for membership after five years.