Ann: Results of Share Purchase Plan, page-3

Or does it mean pro rata on your existing share holding?

Megaport received applications in excess of $47.6 million. The Board of Megaport has determined, based on an assessment of its capital requirements, to cap shares issued under the SPP to $10 million (2,500,000 fully paid ordinary shares), with applicants to be scaled back on a pro-rata basis. Shares will be issued at $4.00 each.

This would mean with 2,500,000 new shares available, and about 125,000,000 shares on issue, you might expect a minimum of 2% of your shareholding, but somewhat more, depending on the number that did not participate, and the percentage of who are classified as "retail shareholders"