Comment on the following statements: Delisting is not permissible under certain circumstances.

According to Regulation 4 of SEBI (Delisting of Equity Shares) Regulations, 2009, delisting is not permissible under following circumstances: Buy back of equity shares by the company; or Preferential allotment made by the company; or Unless a period of three years has elapsed since the listing of that class of equity shares; or Instruments which are convertible into the same class of equity shares that are sought to be delisted are outstanding; Delisting of convertible securities.