RGESS eligibility rules define eligible securities and new retail investor conditions under the Scheme for tax-favoured investments. Specifies eligible securities for investment under the Rajiv Gandhi Equity Savings Scheme-BSE-100/CNX-100 equity shares on purchase day; designated public sector enterprise shares; ETFs or mutual fund units with those securities as underlying that are listed and settled through a depository; follow-on public offers and certain new fund offers; and IPOs of public sector undertakings meeting government-shareholding and turnover criteria. Defines new retail investor as a resident individual without prior demat or equity/derivative transactions (with non-first holders of joint accounts treated as not having opened a demat account).