Alteration of rights in specified securities requires supermajority consent or a special resolution; SME issuers face migration rules. Alteration of rights in specified securities is prohibited if it would adversely affect holders unless at least three-fourths in writing consent or a special resolution of that class is passed. Issuers on an SME exchange whose post-issue paid-up capital is likely to exceed a prescribed capital threshold by further issue must migrate to the Main Board and seek Main Board listing for proposed securities, and may only proceed after shareholders approve migration by a specified special-resolution postal ballot majority and after obtaining in-principle Main Board approval; an alternative permits further issuance on the SME exchange subject to compliance with Main Board listing obligations and disclosures.