The NSE has imposed a one-day ban on derivatives trading for nine major companies, including Punjab National Bank, Bandhan Bank, L&T Finance, and Aditya Birla Fashion. Can Fin Homes, Dixon Technologies, Indiamart Intermesh, Manappuram Finance, and Mahanagar Gas are the other affected companies. The ban will be effective from January 27, but trading in the cash market for these companies will remain unaffected during this period.