Differences Between Public And Private Companies In Australia

Choosing the right company structure is one of the most important decisions you’ll make when starting or restructuring a business in Australia. A common question we hear is simple but critical: what’s the actual difference between a public and a private company - and which suits your goals?

Understanding the distinction isn’t just a technical exercise. It affects how you protect your personal assets, raise capital, run your board, report to regulators and the market, and even how easily your shareholders can sell their shares.

In this guide, we’ll unpack how public and private companies work in Australia, where they differ, and how to decide what’s right for you. We’ll also outline the core legal requirements and documents you’ll need so you can move forward with confidence.

What Is A Company And Why Does Structure Matter?

In Australia, a company is a separate legal entity registered with the Australian Securities and Investments Commission (ASIC). Once registered, the company can own property, enter contracts and take on debt in its own name - separate from its owners (shareholders). ASIC issues an Australian Company Number (ACN) as proof of registration, and you’ll usually receive an ASIC Certificate of Registration as part of the process.

Why does structure matter? In short, it shapes risk and growth. A company offers limited liability (your personal assets are generally protected if things go wrong) and credibility with customers and investors. But different company types carry different obligations and fundraising pathways.

In Australia, most companies fall into two broad categories:

• Private companies (proprietary limited or “Pty Ltd”)
• Public companies (which can be listed or unlisted)

Both let you operate with limited liability, but they differ significantly in ownership rules, capital raising, reporting, governance and cost.

Private Companies (Pty Ltd): How They Work

For startups, family businesses and many growing SMEs, a proprietary limited (Pty Ltd) company is often the go-to structure. It’s built for closely held ownership and operational flexibility.

Key Features Of Private Companies

• Ownership and shareholders: Up to 50 non-employee shareholders. Founders, family and private investors commonly hold the shares.
• Raising capital: Cannot invite the general public to buy shares. Funding typically comes from founders, friends and family, private placements or venture investors.
• Share transfers: Usually restricted by the company’s constitution or a Shareholders Agreement (e.g. board approval or pre‑emption rights).
• Directors: At least one director who ordinarily resides in Australia. See the Australian resident director requirements.
• Reporting: Small proprietary companies have lighter reporting (no routine audit requirement). “Large” proprietary companies must prepare audited financial statements and lodge with ASIC.
• Privacy: Lower disclosure to the public compared with public companies.

Private companies balance liability protection with simpler compliance. If you want control to remain with a small group and you’re not seeking public investors, a Pty Ltd can be an efficient and scalable choice.

Governance Basics For Private Companies

Your governance settings will live primarily in your Company Constitution and, if you have more than one owner, a Shareholders Agreement. These documents set the rules on decision‑making, issuing and transferring shares, dividends, board processes, dispute resolution and more.

Public Companies: Listed Vs Unlisted

Public companies are designed for broader ownership and larger capital raises. Some are listed on the ASX, while others remain unlisted but still operate as public companies (for example, where they have a large or diverse shareholder base or specific strategic reasons).

Key Features Of Public Companies

• Ownership and shareholders: No cap on shareholder numbers. Shares can be widely held (including by members of the public).
• Raising capital: May offer shares to the public (subject to disclosure rules) and, if listed, can access public markets.
• Share trading: If listed, shares are traded on the ASX, improving liquidity for investors.
• Directors and secretary: At least three directors (two ordinarily resident in Australia) and at least one company secretary.
• AGMs and governance: Must hold an annual general meeting (AGM) and meet heightened governance standards.
• Reporting: All public companies prepare and lodge annual financial reports. Disclosing entities (which includes most listed companies) also lodge half‑yearly reports and comply with continuous disclosure.

With public investment opportunities come stricter oversight and higher costs. For ambitious, capital‑intensive growth, a public structure (particularly a listed one) can be powerful - provided you’re ready for the governance and reporting workload.

Public Vs Private: The Key Differences

Here’s where the two structures diverge in practice.

1) Ownership And Capital Raising

• Private (Pty Ltd): Can’t advertise or sell shares to the public. Capital typically comes from private placements to sophisticated investors, founders or employees. Formal documents like a Share Subscription Agreement are often used when issuing new shares.
• Public: Can raise money from a wide investor base, and a listed public company can tap public markets through placements, rights issues and other offers. This access can significantly expand your funding options.

2) Reporting And Disclosure

• Private (Pty Ltd): “Small” proprietary companies generally have lighter reporting (e.g. no routine audit). “Large” proprietary companies must prepare audited financials and lodge them with ASIC.
• Public: Must prepare and lodge annual financial reports. If the company is a disclosing entity (including most listed entities), it also lodges half‑yearly financial reports and complies with continuous disclosure to the market.

3) Board, Management And Governance

• Private (Pty Ltd): Minimum one Australian‑resident director. Governance is typically less formal, guided by your constitution and Shareholders Agreement.
• Public: Minimum three directors (two resident in Australia) and a company secretary. Annual general meetings, board committees and detailed governance policies are standard.

4) Share Transfers And Control

• Private (Pty Ltd): Transfers are usually restricted to keep the ownership base stable (e.g. pre‑emption rights). This helps founders maintain control but reduces liquidity for shareholders.
• Public: If listed, shares can be traded freely on the ASX, improving liquidity but reducing the founders’ ability to control who holds the shares.

5) Cost, Complexity And Public Scrutiny

• Private (Pty Ltd): Lower compliance costs and less public reporting. Suited to owners who want to grow without the obligations of public markets.
• Public: Higher ongoing costs (audits, governance, market announcements) and more public scrutiny. That visibility can be a strategic advantage - but it’s a commitment.

For a deeper comparison of the trade‑offs, you may find it helpful to review practical pros and cons across both structures.

Which Structure Is Right For You?

There’s no one‑size‑fits‑all answer. The best structure depends on where you are now - and where you want to be in the next few years.

Choose A Private Company If You:

• Want a simple, scalable structure with limited liability and tighter control over ownership
• Plan to raise capital privately (e.g. friends, family, angels or venture capital)
• Prefer lighter compliance and lower costs while you validate and grow

Consider A Public Company If You:

• Intend to raise substantial funds from a broader investor base or operate with widely held ownership
• Are preparing for an ASX listing or you want the flexibility to list in future
• Are comfortable investing in governance, financial reporting and market disclosure from day one

If you’re leaning public purely for profile, sense‑check whether the extra cost and complexity will truly accelerate your strategy. Many businesses stay private for a long time and still achieve significant scale.

Can You Convert Between Structures?

Yes. Many companies start private and convert to public when raising at scale or preparing for listing. Conversion typically involves amending your constitution, expanding your board and secretary appointments, meeting disclosure and governance standards, and notifying ASIC of changes to company details (often by lodging the relevant forms).

Going the other way (public to private) is less common but sometimes done as part of a restructure. Either way, the process is technical - getting tailored advice early will keep the transition smooth and compliant.

Legal Obligations And Documents In Australia

Whichever structure you choose, there are core legal areas and documents to get right. Here’s a practical checklist.

1) Registration And Core Company Governance

• ASIC registration and ACN: Register your company with ASIC and keep your details up to date. ASIC issues your ACN as proof of registration.
• Company Constitution: Your internal rulebook for decision‑making, meetings, share issues and more. A tailored Company Constitution helps avoid gaps and disputes as you grow.
• Directors and secretary: Ensure you meet minimum numbers and Australian residency rules for directors. Here’s a refresher on resident director requirements.

2) Ownership Arrangements And Capital Raises

• Shareholders Agreement (private companies): A Shareholders Agreement sets out founder roles, decision‑making, exits, valuation mechanics, pre‑emption rights and dispute processes.
• Share issues and investment documents: When bringing in investors, use a Share Subscription Agreement and any related term sheets or investor rights documents. Public capital raising requires compliance with the Corporations Act disclosure regime.

3) Consumer Law And Customer Contracts

• Australian Consumer Law (ACL): If you sell goods or services, ensure your marketing, refunds, warranties and standard form contracts comply with the ACL and unfair contract terms regime.
• Customer terms: Have clear customer contracts or online terms (scope of services, pricing, payment terms, IP, liability and termination). These are essential for day‑to‑day risk management.

4) Employment And Contractors

• Fair Work compliance: If you hire staff, ensure lawful pay, hours, leave and entitlements and the correct award coverage.
• Employment contracts and policies: Put in place role descriptions, confidentiality and IP clauses, and policies on conduct, leave and performance. An Employment Contract is the baseline protection for both sides.

5) Privacy And Data

• Privacy Act: The Act applies to “APP entities” (generally businesses with $3m+ annual turnover, and some smaller businesses in specific categories - e.g. health service providers or those trading in personal information). APP entities must have a compliant Privacy Policy and follow the Australian Privacy Principles.
• Best practice for others: Even if you’re not an APP entity, a clear Privacy Policy and good data practices build trust and reduce risk.

6) Branding And IP

• Trade marks: Protect your name, logo or key product brands to stop others using confusingly similar branding. Consider applying to register your trade marks.
• Copyright: Copyright arises automatically in original content (e.g. code, designs, marketing copy) - there’s no general “copyright registration” system in Australia. For product look and feel, consider design registration where appropriate.

7) Tax And Finance

• ABN, TFN and GST: Apply for an ABN and TFN, and register for GST when required. Consider payroll tax and superannuation obligations if you have staff.
• Speak with your accountant: A good accountant will help you set up reporting, manage cashflow and meet ATO deadlines from day one.

Public companies - particularly listed entities - will also need a stronger governance framework (board charters, codes of conduct, continuous disclosure policies) and external audits as part of their annual cycle. For private companies, robust internal processes and the right contracts go a long way to keeping you compliant and investor‑ready.

Key Takeaways

• Private companies (Pty Ltd) are designed for closely held ownership, simpler reporting and lower cost - great for early‑stage and growth businesses that don’t need public fundraising.
• Public companies can raise capital from a wider investor base and (if listed) access public markets, but must meet higher governance, disclosure and audit standards.
• The biggest differences sit in ownership and capital raising, reporting and disclosure, board composition and governance, share transfer rules and ongoing costs.
• Your constitution and a strong Shareholders Agreement (for private companies) set the foundation for decision‑making, ownership changes and dispute resolution.
• Core compliance spans consumer law, employment, privacy and IP. APP entities must have a compliant Privacy Policy; all businesses should protect brand assets and use clear customer and staff contracts.
• If you plan to raise investment, use proper share issue documents such as a Share Subscription Agreement and lay out investor rights clearly.
• You can convert between private and public structures, but the process is technical and comes with additional governance and reporting obligations - get advice early to avoid delays.

If you’d like a consultation on whether a private or public company is right for your business - or help setting up your documents and structure - reach out to us at 1800 730 617 or team@sprintlaw.com.au for a free, no‑obligations chat.