In Australia, the number of directors and shareholders you can have in your company varies depending on the type of company you are registering.
For a proprietary company, which is the most common type for small to medium-sized businesses, there must be a minimum of one shareholder and a maximum of 50 shareholders, not including employee shareholders.
As for directors, there must be at least one director who must ordinarily reside in Australia. If you are establishing a public company, the requirements change slightly; there must be a minimum of one shareholder, with no maximum limit, and at least three directors, two of whom must ordinarily reside in Australia.
It's important to note that these numbers can influence various aspects of your company, from governance to fundraising capabilities, and should be considered carefully in the context of your business objectives and growth strategies. Always ensure to stay updated with the latest regulations as they can evolve, and consider consulting with a legal expert to understand the implications fully.