Alex is Sprintlaw’s co-founder and principal lawyer. Alex previously worked at a top-tier firm as a lawyer specialising in technology and media contracts, and founded a digital agency which he sold in 2015.
Does a share certificate prove you own shares, or do you need a shareholders agreement too? The reassuring answer is that these documents do different jobs, and once you know which job each one does, the paperwork becomes much easier to manage.
In a share certificate vs shareholders agreement comparison, the share certificate is evidence of a shareholding. The shareholders agreement is the rulebook for how shareholders deal with each other and the company.
There's one more document you should keep in mind: the company share register. For an Australian company, especially a Pty Ltd company, the share register is often the key ownership record under the Corporations Act 2001.
What Is The Difference Between A Share Certificate And A Shareholders Agreement?
A share certificate records that a person or entity holds particular shares, while a shareholders agreement sets out the rights, obligations and decision-making rules between the shareholders.
Think of it this way:
- Share certificate: evidence that you hold a certain number and class of shares.
- Share register: the company's official record of who its shareholders are.
- Shareholders agreement: a private contract that explains how the shareholders will work together.
In Australia, a share certificate will usually include details such as:
- the company name and ACN
- the shareholder's name
- the number and class of shares
- whether the shares are fully paid or partly paid
- the date of issue or transfer
- signature details required by the company
A shareholders agreement goes further. It might cover who can appoint directors, what happens if someone wants to sell, how new shares can be issued, what approvals are needed for major decisions, and how disputes are handled.
So, if you're asking which document proves ownership and which document governs rights, the answer is: the share certificate helps evidence ownership, the share register is the company's ownership record, and the shareholders agreement governs the relationship.
Does A Share Certificate Prove Share Ownership In Australia?
Yes, a share certificate is strong evidence of share ownership, but it should line up with the company's share register.
For Australian companies, the Corporations Act 2001 requires a company to keep a register of members. This is commonly called the share register. It should record details such as the shareholder's name and address, the date they became a shareholder, the shares they hold, the share class, and amounts paid or unpaid on those shares.
A share certificate is important because it gives the shareholder a clear document showing their holding. For most proprietary companies, the company must issue share certificates or other appropriate title documents after shares are issued or transferred. Under the Corporations Act, these generally need to be completed and delivered within 2 months after an issue and within 1 month after a transfer is lodged, subject to limited exceptions. The exact process should be checked against the Corporations Act, the company's constitution and any existing agreements, because signing requirements and any special rules can vary depending on the company and share type.
If the certificate says you own 100 ordinary shares, but the register hasn't been updated, you can end up with confusion later. This can become a real problem when you try to:
- bring in an investor
- sell your shares
- declare dividends
- resolve a dispute about voting rights
- prepare for due diligence in a business sale
ASIC records are also relevant, but they aren't a substitute for maintaining your own company records properly. ASIC keeps company information and receives certain lodgements, but your internal share register and supporting documents are what investors and buyers will usually want to inspect closely.
What Is The Difference Between A Shareholders Agreement And A Share Register?
A share register records who owns the shares, while a shareholders agreement explains what shareholders can and can't do with those shares.
The share register isn't usually where you put commercial rules. It shouldn't be cluttered with side deals, founder promises or investor protections. Its job is to be accurate and current.
A shareholders agreement can deal with the commercial rules that matter day to day, such as:
- Decision-making: which decisions directors can make and which ones need shareholder approval.
- Reserved matters: big decisions that need a special percentage approval, such as issuing new shares, taking on debt or changing the business model.
- Share transfers: whether shareholders must offer shares to existing shareholders before selling to someone else.
- Founder departures: what happens if a founder leaves, stops working in the business or breaches the agreement.
- Dividends: whether profits are reinvested or paid out, and who decides.
- Deadlocks: what happens if shareholders can't agree on a major decision.
- Confidentiality and IP: how sensitive business information and intellectual property are protected.
The shareholders agreement should work alongside the company's constitution. If the documents conflict, it can create uncertainty about which rule applies. This is one reason templates can be risky. A template may look fine on its own, but still fail to match your cap table, voting structure or constitution.
If your company has more than one shareholder, the share register and shareholders agreement should be treated as a matched set, not separate paperwork sitting in different folders.
When Do You Need Share Certificates, A Share Register And A Shareholders Agreement Together?
You usually need all three when your company has more than one shareholder or when you're issuing shares to an investor, co-founder or employee share participant.
Each document answers a different practical question:
- Who owns what? Check the share register and share certificates.
- What rights attach to the shares? Check the constitution, share terms and shareholders agreement.
- How can shares be transferred or issued? Check the shareholders agreement, constitution, board approvals and share register.
Example: Bringing In A New Investor
Say Mia and Josh run a software company in Melbourne. Their company has 100 ordinary shares on issue. Mia owns 60 and Josh owns 40.
An investor agrees to put in funds in exchange for 25 new ordinary shares. After the issue, there are 125 shares in total. Mia now holds 60 out of 125 shares, which is 48%. Josh holds 40 out of 125 shares, which is 32%. The investor holds 25 out of 125 shares, which is 20%.
To document that properly, the company should usually:
- approve the share issue through the correct company process
- update the share register to record the investor as a shareholder
- issue the required share certificate or other compliant title document for the holding
- update ASIC records if a lodgement is required
- make sure the shareholders agreement covers the new ownership structure
If the company only issues a certificate but forgets to update the shareholders agreement, the investor may not have the voting protections or transfer rights they expected. If the company signs a shareholders agreement but forgets to update the register, the ownership records may be messy when the next investment round comes along.
What Company Share Documents Should You Keep Together?
You should keep every document that shows how shares were created, issued, transferred and governed, because investors and buyers will often review the full paper trail.
A good company share file will usually include:
- the company constitution, if the company has one
- the share register
- share certificates
- share application forms or share subscription agreements
- share transfer forms
- board minutes or circulating resolutions approving share issues or transfers
- member resolutions, where shareholder approval was needed
- the shareholders agreement and any deeds of accession
- ASIC lodgement confirmations
- any option plan or employee share scheme documents
If you're preparing a shareholders agreement, a tailored document will usually cover the sections below. This is an outline only, not a finished agreement. A lawyer should tailor it before you use it, especially if you have investors, different share classes or share vesting arrangements.
Shareholders Agreement Outline
- Parties: list the company and each shareholder who will be bound.
- Shareholdings: set out the current shares, percentages and share classes.
- Company Management: explain director appointment rights and board processes.
- Reserved Matters: list major decisions that need special approval.
- Funding: explain whether shareholders must contribute more money and what happens if they don't.
- Share Transfers: set the rules for selling, gifting or transferring shares.
- New Share Issues: explain pre-emptive rights and dilution rules.
- Founder Leaver Rules: set out what happens if a founder leaves the business.
- Confidentiality And IP: protect business information, trade secrets and intellectual property.
- Deadlocks And Disputes: set a process if shareholders can't agree.
- Exit Events: cover sale rights, buyback rights, drag along rights and tag along rights.
- Signing And Accession: explain how new shareholders become bound by the agreement.
How Do You Fix It If The Documents Do Not Match?
You should first pause any further share issue, transfer or investor process, then work out which document is wrong and what approvals are needed to correct it.
Mismatched documents are common. Maybe your share certificate says 1,000 shares, the register says 100 shares, and an old pitch deck says 10%. Or perhaps a founder transferred shares by email, but no share transfer form, board approval or register update was completed.
Start with the paper trail in date order:
- Collect the constitution, shareholders agreement and any earlier versions.
- Collect share certificates, share transfer forms, share sale agreements and subscription agreements.
- Collect board and shareholder resolutions approving each issue or transfer.
- Check the share register against those approvals.
- Check ASIC records and note any filings that may need correction.
- Get the directors and affected shareholders to agree on the correct position in writing.
- Prepare rectification documents, replacement certificates or updated registers if needed.
Don't simply edit the register and move on. If someone loses voting rights, dividend rights or percentage ownership because of the correction, you may need proper approvals and signed acknowledgements.
You should also be careful with backdating. It can create bigger issues than the one you're trying to fix. The cleaner approach is usually to record what actually happened, identify the error, and then approve a correction from the right date using proper company documents.
If the mismatch affects an investor, sale process or founder exit, get help early. A tidy correction now can save a lot of difficult questions in due diligence later.
Key Takeaways
- A share certificate is evidence of a shareholding, but it should match the company's share register.
- The share register is the company's ownership record and should be kept accurate under the Corporations Act 2001.
- For most proprietary companies, share certificates or other compliant title documents must be issued after shares are issued or transferred within the usual Corporations Act timeframes.
- A shareholders agreement isn't mainly proof of ownership. It governs decision-making, transfers, exits, funding and shareholder rights.
- Most companies with more than one shareholder should keep all three: share certificates, a current share register and a tailored shareholders agreement.
- If your documents don't match, pause new share activity, review the paper trail and correct the records properly.
If you'd like help with your share certificates, share register, shareholders agreement or company share documents, you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.
Drafted by Taylor, Sprintlaw's AI, and overseen by Alex Solo. How we write
Turn ownership into workable control rules
Which shareholder events should you document?
Percentages alone do not settle board control, reserved matters, transfers, leavers, deadlocks or exits. Those rules should be agreed before pressure arrives.







