Grandfathering of unlisted NCDs preserved; mutual funds may transact subject to due diligence and extended compliance timeline. Grandfathering of existing unlisted non-convertible debentures (identified NCDs) is confirmed as an industry-wide concession allowing mutual funds to transact in and hold those instruments until maturity, subject to ongoing investment due diligence and applicable investment restrictions. The compliance timeline for maximum exposure limits to unlisted NCDs within a scheme's debt portfolio has been extended to later dates, while the regulatory power to protect investor interests and regulate the securities market is invoked to issue this clarification.