How to add nominees to Demat A/c and MFs before SEBI deadlines end: If you invest in mutual funds or hold a Demat account, then this information is for you. The Securities and Exchange Board of India (SEBI) has made it mandatory for all Demat and Mutual Fund (MF) account holders to add a nominee or opt out. SEBI has also fixed the deadline of 31 December 2023 for this. Therefore you should complete this important work on time. If you want, you can complete this entire process online sitting at home.