News: API Australian Pharmaceutical Industries Posts FY NPAT Of $56.6 Mln, page-13

671B, any shareholder who acquires (alone or with associates) a relevant interest in 5% or more of a company's shares must disclose that fact by lodging an ASIC Form 603 “Notice of Initial Substantial Shareholder” with the Company and disallowed.

after a little further reading they need to lodge any change greater than 1% within 2 business days.

Some guidance will hopefully come through at some stage... last to know is the way for retail investors unfortunately.