SEBI has, vide its circular no. SEBI/HO/IMD/DF3/CIR/P/2017/114 dated 6th October 2017, defined large cap, mid cap and small cap companies in order to ensure uniformity in respect of the investment universe for equity mutual fund schemes. Further, SEBI has also stipulated that AMFI shall prepare the list of stocks in this regard, in accordance with the points specified under para 8 of the circular.
Accordingly, AMFI, in consultation with SEBI and Stock Exchanges, prepares the list of stocks, based on the data provided by Bombay Stock Exchange (BSE), National Stock Exchange (NSE) and Metropolitan Stock Exchange of India (MSEI) and displays on its website https://www.amfiindia.com/research-information/other-data/categorization-of-stocks