SEBI issued a circular mandating that companies must have 100% of promoter and promoter group shares in dematerialized form by the quarter ending September 2011. If companies do not meet this criteria, their shares will be traded in the trade for trade segment instead of the normal segment. Stock exchanges must update their systems and guidelines to implement this decision, and notify listed companies and members. This aims to further promote dematerialization and improve transparency in promoter share dealings.