FBR General Discussion, page-6156

Here's the ASX ruling:

Substantial holding notice:

A person who obtains voting power in 5% or more of an ASX-listed company is required to publicly disclose that fact within 2 business days via the filing of a substantial holding notice. A person’s voting power consists of their own ‘relevant interest’ in shares plus the relevant interests of their associates. A further notice needs to be filed within 2 business days after each subsequent voting power change of 1 percentage point or more, and after the person ceases to have voting power of 5% or more. The notice must attach all documents which contributed to the voting power the person obtained, or provide a written description of arrangements which are not in writing.