(1) SGX-ST shall, from time to time, open for trading Series of Options in respect of underlying securities approved for Options trading.

(2) Only Options of a Series currently open for trading may be purchased or written on SGX-ST.

(3) The opening of a new Series of Options shall not affect other Series of Options previously opened.

(4) No transaction in Options of a particular Series shall be made after the close of the Equity Market of the underlying security on the Market Day preceding the Expiration Date of that Series of Options.