For the purposes of rules 13.03 to 13.14 "shares" shall mean shares of all classes and securities which carry a right to subscribe or purchase shares, of the issuer provided that the Exchange may waive the requirements of those rules in respect of any fixed participation shares which are, in the opinion of the Exchange, more analogous to debt securities than equity securities. References to purchases of shares include purchases by agents or nominees on behalf of the issuer or subsidiary of the issuer, as the case may be.