Buying Shares In A Company In Australia: Step-By-Step

Buying shares in another company can be a smart growth move for startups and small businesses - whether you’re investing in a supplier, partnering with a complementary brand, or taking a strategic stake in a business you want to work with long-term.

But even when the commercial relationship feels straightforward, the legal steps behind buying shares in a company can get complicated quickly. Share transfers, shareholder approvals, valuation, warranties, and restrictions in the company’s documents can all affect what you’re actually buying (and what risks you’re taking on).

This guide breaks down the process in practical terms, from a small business perspective, so you can move forward with clarity and protect your business as you invest.

What Does It Mean To Buy Shares In A Company?

When your business buys shares in a company, you’re buying an ownership interest in that company (rather than buying its assets). Shares usually come with a bundle of rights, which can include:

• Economic rights (like dividends, if any are paid)
• Voting rights (a say in key company decisions)
• Information rights (access to certain financial or business information)
• Exit rights (how you can sell later, and when)

Exactly what you get depends on the type of shares and the company’s governing documents.

Buying Shares vs Buying Business Assets

It’s worth being clear on what you’re trying to achieve. In Australia, there are generally two ways to “buy into” a business:

• Share sale: you buy shares from existing shareholders (or subscribe for new shares), and you become an owner of the company.
• Asset sale: you buy specific assets (like equipment, IP, customer lists) without buying shares in the company.

A share purchase can be attractive because the business keeps running in the same legal entity - so many contracts, licences/approvals, and employment arrangements may continue without needing to be re-signed. However, this is not always the case: some contracts and licences include consent requirements or “change of control” clauses, and you may inherit risks that sit inside the company (like unpaid tax, disputes, or unknown liabilities) unless the deal is structured carefully.

Private Company vs Public Company: What Most Small Businesses Will See

Most startups and small businesses buying shares are dealing with a private company (often a Pty Ltd). Private companies usually have restrictions on who can own shares and how transfers happen, which makes the legal process more “hands-on”.

If you’re buying shares in a listed public company, the process is usually through a broker/exchange and is less about negotiating documents. This article focuses on the private-company scenario, where legal documents and approvals matter most.

Step-By-Step: How To Buy Shares In A Company (For Businesses)

Here’s a practical roadmap you can follow. The exact steps will depend on whether you’re buying from an existing shareholder (a transfer) or investing new money into the company (a new issue of shares).

1) Get Clear On The Commercial Deal

Before you get into paperwork, confirm the commercial basics:

• How many shares are you buying (and what % of the company is that)?
• Are you buying existing shares (from a shareholder) or new shares (issued by the company)?
• What price are you paying, and when is it payable?
• Are there conditions (e.g. finance approval, due diligence, shareholder approvals)?
• Will you get a board seat, voting rights, or veto rights over certain decisions?

It’s common to record these points in a short “heads of agreement” or term sheet. This helps everyone stay aligned while you work through due diligence and definitive documents.

2) Check The Company’s Rules On Share Transfers

In private companies, you can’t assume shares are freely transferable. The company’s constitution and/or any shareholders agreement may contain:

• pre-emptive rights (existing shareholders get first right to buy before an outsider)
• director approval requirements
• limits on who can become a shareholder
• drag-along and tag-along provisions (rights that affect exits)
• different share classes with different rights

This step is often where deals get delayed - not because anyone is acting in bad faith, but because the “rules of the company” weren’t checked early.

3) Work Out A Sensible Valuation (And What You’re Actually Buying)

Valuation isn’t just a finance question - it’s also a legal and risk question, because it shapes how hard you negotiate warranties, security, and exit protections.

When you’re thinking about price, try to look beyond “last year’s revenue” and consider:

• debts and liabilities sitting in the company
• customer concentration (does the company rely on one or two major customers?)
• ownership of key IP (is it actually owned by the company?)
• key person risk (does the business fall over if one founder leaves?)
• existing contracts that could be terminated or require consent on a change of control

If you’re negotiating value in a private company, it’s helpful to understand common valuation approaches and what may be appropriate for your situation. This is where a discussion about valuing shares can also sharpen what you ask for in the legal documents.

4) Do Due Diligence (Even If It’s A “Friendly” Deal)

Due diligence is your chance to verify what you’re being told, and uncover issues that should affect price, structure, or conditions.

For small business share purchases, due diligence is often targeted rather than massive. A sensible starting checklist includes:

• Company search: ASIC extracts, company details, current shareholders
• Financial: management accounts, tax position, liabilities, bank facilities
• Key contracts: customer and supplier contracts, leases, major subscriptions
• Employment/contractors: key staff agreements, any disputes, compliance issues
• IP ownership: trade marks, domain names, software/code ownership, assignments
• Litigation: current or threatened disputes

This step isn’t about mistrust - it’s about protecting your business and making sure the share purchase matches the commercial reality.

5) Choose The Right Deal Structure

There are a few common ways to structure a deal. The “right” one depends on your risk appetite, the other side’s expectations, and what you want to achieve.

• Share transfer: you buy shares from an existing shareholder. Money usually goes to the seller, not the company.
• Share issue/subscription: the company issues new shares to you, and your money goes into the company to fund growth.
• Tranche investment: you invest in stages (e.g. some shares now, more shares if milestones are met).
• Convertible arrangements: sometimes used where valuation is hard today (more common in startup funding).

From a small business perspective, a staged or conditional investment can be a practical way to manage risk - especially where performance depends on execution over the next 6–18 months.

6) Prepare And Sign The Key Documents

At a minimum, most private share deals require:

• a share sale agreement (or share subscription agreement)
• board/shareholder approvals and minutes/resolutions
• a share transfer form (if it’s a transfer)
• updates to the company’s registers (e.g. register of members)

In many cases, you’ll also need supporting documents around governance and investor rights, especially if you’re taking a meaningful stake.

Where the deal needs more detail and protection, it’s common to document it formally in a Share Sale Agreement that clearly sets out what is being bought, what is being promised, and what happens if something goes wrong.

7) Complete The “Post-Signing” Steps (So It’s Legally Effective)

Signing is only part of the process. Completion steps matter because they’re what make your shareholding enforceable in practice - and, for legal title, the company’s register of members is a key reference point under Australian company law (you may have an enforceable right to the shares before registration, but registration is what typically perfects legal title against the company and third parties).

Typical completion actions include:

• payment of the purchase price (often at completion, sometimes partly held back)
• delivery of original signed documents
• issuing and recording evidence of ownership (including share certificates, where applicable - noting that share certificates are not always issued or required)
• updating the company’s register of members
• any required ASIC notifications (depending on the circumstances - for example, many changes of shareholdings are reflected on the annual statement rather than via a separate “share transfer form” lodged with ASIC, while other company changes may trigger ASIC lodgements)

These details are easy to overlook when everyone is focused on the “big deal” points - but if the registers aren’t updated correctly, it can create major headaches later (especially during future fundraising or an exit).

Key Legal Documents To Get Right When Buying Shares

Share deals don’t just rely on one contract. A well-run purchase usually involves a set of documents that work together to protect you and reduce ambiguity.

Share Sale Agreement (Or Subscription Agreement)

This is the main deal document. It typically covers:

• the number and type of shares
• purchase price and payment mechanics
• conditions precedent (what must happen before completion)
• warranties (promises about the company and the shares)
• limitations on liability and claims process

Warranties matter because they give you contractual rights if important information turns out to be wrong or incomplete.

Shareholders Agreement

If you’re buying into a company with other founders or investors, a Shareholders Agreement is often where the real “operating rules” live - decision-making, reserved matters, funding, information rights, exit rights, and what happens if someone wants to leave.

Without one, you may be relying on default rules and a constitution that wasn’t drafted with your investment in mind.

Company Constitution

The constitution can control how shares are transferred, how meetings work, and what approvals are required for key actions.

Even if there’s a shareholders agreement, the constitution still matters - because third parties (and the company itself) may rely on it, and it can set baseline rights that impact your position.

Board And Shareholder Resolutions

Depending on the company and the transaction, you may need:

• director approval of a share transfer
• shareholder approval for issuing new shares
• approval to enter into the transaction documents

These approvals are part of good corporate governance, and they help reduce the risk of later disputes about whether the deal was properly authorised.

Common Traps Small Businesses Should Watch Out For

When your business is buying shares, your biggest risks are often not the obvious ones. Here are some of the most common pitfalls we see in share deals.

Ignoring Transfer Restrictions And Pre-Emptive Rights

A seller might be ready to sell - but if the constitution or shareholder arrangements require the shares to be offered to other shareholders first, your deal may not be allowed in its current form.

This is one reason it’s helpful to review the company’s key documents early, before you invest time and energy negotiating price.

Assuming “A Minority Stake” Means “Low Risk”

Buying 10% or 20% may feel like a “toe in the water”, but you still need to understand:

• what you can and can’t control
• how future funding rounds might dilute you
• how you can exit if things don’t work out

A minority position can be commercially valuable, but you want to negotiate the right protections so you’re not locked into an investment you can’t influence or sell.

Not Being Clear On Who Owns The IP

In startups especially, it’s common for early IP (like software code, branding, content, designs, or know-how) to be created by founders or contractors.

If that IP was never properly assigned to the company, then buying shares may not give you the practical business value you thought you were buying.

Overlooking “Change of Control” Terms In Key Contracts

Some contracts allow the other party to terminate (or require consent) if there’s a significant change in ownership, or if certain shareholders leave.

If the company’s biggest customer contract can be terminated upon a share sale, that’s not just a legal issue - it’s a valuation and risk issue for your business.

Forgetting Tax And Duty Issues

Share transactions can have tax and duty consequences in Australia. For example:

• Capital gains tax (CGT): the seller may have CGT implications when they sell shares (and buyers often factor this into negotiations).
• Stamp duty: while share transfers in many private companies are often not subject to stamp duty, some states and territories can impose duty in specific situations (for example, where the company is “land rich” or the transaction involves interests in land-holding entities). Rules vary by jurisdiction.

Sprintlaw can help with the legal documentation and process, but you should also speak with an accountant or tax adviser early so tax/duty outcomes are understood and built into the deal structure.

Special Situations: Buying Shares From Family, Founders, Or As Part Of A Broader Deal

Not all share purchases are purely commercial. Some happen inside family groups, between co-founders, or as part of a restructure. The process is similar, but the “risk points” can change.

Buying Shares From A Founder Or Early Investor

If you’re buying out a founder or early investor, it’s worth checking whether their departure triggers:

• vesting/unvesting arrangements (in early-stage startups)
• restrictions on transferring shares
• rights held by other investors (e.g. approval rights)

It’s also the moment to clarify what happens to confidential information, client relationships, and IP if that person is leaving the business.

Transferring Shares Within A Family Or Related Entities

Family transfers can still have real legal and tax consequences, especially if the business is successful and the shares have significant value.

Even when the parties are aligned, documenting it properly reduces the risk of disputes later (including in estate planning or business succession contexts). If this is your situation, the legal steps around transferring shares to family members are worth understanding upfront.

Important: transfers within families can also raise tax and duty issues (including CGT events and, in some cases, stamp duty depending on the state/territory and what the company owns). This article is general information only and isn’t tax or financial advice - it’s a good idea to speak with an accountant or tax adviser before you proceed.

When You Need To Actually “Transfer” Shares

Sometimes business owners agree commercially that shares are being sold, but they don’t complete the formalities correctly - which can create uncertainty over ownership.

In Australia, the mechanics of how to transfer shares matter because the company’s approvals and registers are what support your rights as a shareholder (and, in particular, registration in the company’s register of members is typically what determines legal title against the company).

If you’re buying shares as part of a broader arrangement (like a joint venture, a long-term supply partnership, or a staged acquisition), it’s especially important that each step is properly documented so there’s no confusion about what has happened and what is still conditional.

Key Takeaways

• For startups and small businesses, buying shares in a company is usually a private-company transaction that requires careful checking of transfer rules, approvals, and shareholder arrangements.
• Before you sign anything, clarify whether you’re buying existing shares or subscribing for new shares, and confirm what rights come with the shares you’re getting.
• Due diligence is critical - even in “friendly” deals - because buying shares can expose you to risks sitting inside the company.
• The right documents (including a share sale agreement and often a Shareholders Agreement) help manage risk, clarify control, and set up a clean exit path.
• Don’t forget the completion steps: updating registers, recording approvals properly, and issuing share certificates where applicable can be just as important as the contract itself.
• Consider tax and duty early (including CGT and any potential stamp duty), and speak to an accountant/tax adviser about your specific circumstances.

If you’d like help buying shares in a company or documenting a share transaction properly, you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.