When starting a business, a common structure to run your business through is a private company limited by shares. Many opt for this structure because of the limited liability protection and the ease of bringing on investors. However, during the course of running your business, your circumstances might change to the point where a private company is no longer appropriate. This article will explain why a business may change from a private to a public company structure and the process for doing so.
What is a Public Company Structure?
A public company is an entity which can trade its shares on a public exchange market, such as the Australian Securities Exchange (ASX). A public company can be listed or unlisted. The former can offer their shares to the public on the ASX. The latter cannot but can still raise capital through private investment.
The four different types of public companies are:
- public companies limited by shares;
- public companies limited by guarantee;
- unlimited public companies with a share capital; and
- no liability companies.
Key Reasons to Change to a Public Company Structure
50 Shareholder Limit
The Corporations Act 2001 (Cth) (Corporations Act) limits the number of shareholders a private company can have, the maximum being 50 non-employee shareholders. This does not include any crowd-sourced funding shareholders permitted under the Corporations Act. As such, a private company which has reached this limit may decide to convert to a public company if it wishes to take on further investors.
Suppose a private company exceeds this limit. In that case, the Australian Securities and Investments Commission (ASIC) may order that the company converts to a public company under section 165 of the Corporations Act. If the company fails to comply within two months, ASIC will change the company into a public company.
Capital Raising Ability
A public company has no limit on the number of shareholders it can take on and can list its shares for sale to the public on a public stock exchange. Accordingly, its capital-raising abilities are virtually endless. Even if a company chooses to convert to a public unlisted company, the lack of a 50-shareholder limit allows the company to take on further private investment than it would have been able to if it had remained private. This additional capital will allow the company to take on additional business expansion opportunities and continue developing its products.
Continue reading this article below the formAdditional Obligations for Public Companies
Additional Regulation
Given that often a public company’s shares are available to purchase by the public, ASIC has recognised the need to protect these potential investors. As such, a public company has additional mandatory disclosure requirements for those considering becoming company shareholders. These requirements usually relate to a disclosure document setting out the company’s:
- financial position;
- liabilities;
- business model; and
- other key information.
Additional Reporting Requirements
ASIC requires a public company to prepare directors and financial reports per the Corporations Act’s rules. A company must also audit these reports. Notably, failure to prepare these reports in this manner can result in penalties for the company.
In addition to preparing the reports, a public company must also:
- lodge them with ASIC within 4 months of the end of the financial year; and
- send them to the company’s members by the earlier of 4 months after year-end or 21 days before the next annual general meeting.

If you are a company director, complying with directors’ duties are core to adhering to corporate governance laws.
This guide will help you understand the directors’ duties that apply to you within the Australian corporate law framework.
Other Requirements
Requirement | Description |
Minimum number of directors | Section 201A(2) of the Corporations Act requires a public company to have a minimum of three directors (and one company secretary), as opposed to a private company only needing one director and not needing a secretary. |
Lodgment of the company constitution | Section 136(5) of the Corporations Act requires a public company to lodge its company constitution with ASIC whenever adopted or modified, whereas a private company usually does not have to do so. |
Annual general meeting | Section 250N of the Corporations Act requires a public company to have an annual general meeting each calendar year, which must be within 5 months of the end of the company’s financial year, whereas a private company has no minimum meeting requirements. |
Changing From a Private Company to a Public Company
If you decide changing to a public company is appropriate for your business, the process is relatively straightforward:
- pass a special resolution approving the conversion. This means at least 75% of the company’s shareholders must approve the change;
- lodge the necessary documents with ASIC:
- ASIC Form 205 – notification of resolution;
- ASIC Form 206 – application for change of company type (which at the time of writing has an application fee of $87); and
- a copy of the company’s new constitution;
- wait for ASIC to approve the application – ASIC must publish a notice in the Commonwealth Gazette regarding the conversion. One month after the notice is published, the change occurs.
Key Takeaways
In certain circumstances, you may need to consider converting your business structure from a private to a public company. This allows your company to take on additional investors (due to the lack of a 50-shareholder limit), which can include those who have purchased shares from the ASX. In addition, this can allow the company to raise capital for its business expansion much easier. However, it is important to remember that running a public company comes with many additional requirements and regulations which can be onerous, so consider it carefully before making the switch.
For more information on how to structure your business, our experienced business lawyers can assist as part of our LegalVision membership. For a low monthly fee, you will have unlimited access to lawyers to answer your questions and draft and review your documents. Call us today on 1300 544 755 or visit our membership page.
Frequently Asked Questions
A public company is an entity which can trade its shares on a public exchange market, such as the Australian Securities Exchange (ASX). A public company can be listed or unlisted.
It depends. If you want to take on more than 50 shareholders, converting to a public company may be necessary. Doing so can also increase your opportunities to raise capital. However, there are several additional requirements when running a public company, so it is not the best structure for every business.
To switch to a public company structure, you must pass a special resolution approving the conversion, lodge the necessary documents with ASIC, and wait the required notice period.
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