What To Do When A Co-Founder Leaves The Startup

What do we do now that a co-founder is leaving the startup? First, take a breath. A founder exit can feel personal and urgent, but the legal clean-up is usually manageable if you deal with the right things in the right order.

The big areas are shares, vesting, IP, confidentiality, access, company records and investor communication. If you leave those loose, the business can end up with an unclear cap table, disputed ownership of code or branding, or an ex-founder still holding keys to critical systems.

If you're dealing with a co-founder leaving a startup in Australia, your goal is simple: protect the company so it can keep operating, raising capital and growing without the exit hanging over it.

Can A Co-Founder Just Resign And Walk Away?

Yes, a co-founder can usually resign from their role, but that doesn't automatically sort out their shares, duties, IP or access. A co-founder may wear several legal hats at once, so you need to separate each one.

Your co-founder might be:

• A director of the company, with duties under the Corporations Act 2001.
• A shareholder, with rights under the constitution, shareholders agreement and the Act.
• An employee, with final pay and leave issues under the Fair Work Act 2009, any award and their employment contract.
• A contractor or adviser, with obligations under a services agreement.
• A founder who created IP, such as code, designs, copy, pitch decks or product concepts.

If they resign as a director, the company should record that resignation and update ASIC, usually through Form 484. ASIC changes for company officeholders are generally due within 28 days. If a director resignation is reported late, the effective resignation date may be treated as the lodgement date rather than the earlier date, unless ASIC or a court approves a different date.

If your co-founder was also an employee, check their contract, award coverage and your payroll rules. You may need to pay out accrued but untaken annual leave, deal with notice, and issue final payslips and records.

Don't treat a resignation email as the end of the matter. Treat it as the trigger for your exit process.

Who Owns The Shares When A Co-Founder Leaves?

It depends on your shareholders agreement, constitution, vesting documents and any side agreements. If there's no agreement that allows the company or other founders to buy back or transfer the shares, your exiting co-founder may simply keep them.

That's often the part that surprises founders. Leaving the business doesn't automatically mean losing shares. Shares are property, and a company can't just cancel them because a founder has stopped working.

Start by checking these documents:

• Shareholders Agreement - look for leaver clauses, compulsory transfer rights, drag and tag provisions, dispute clauses and consent requirements.
• Company Constitution - check share transfer rules, director powers and pre-emptive rights.
• Vesting Deed Or Founder Vesting Schedule - confirm what has vested and what can be bought back or transferred.
• Subscription Or Share Issue Documents - check what the founder paid and any conditions attached to the issue.
• Investor Documents - check whether investor consent is needed before a transfer, buy-back or restructure.

If your documents do allow the company to recover unvested shares, the mechanism matters. Sometimes the founder transfers shares to the remaining founders under a share purchase agreement. Sometimes the company conducts a share buy-back. A buy-back has its own process under the Corporations Act 2001, including approvals and ASIC steps, so don't assume it's just a one-page form.

If there are no leaver or vesting terms, you may need to negotiate a co-founder separation agreement. That agreement can record how many shares are kept, sold or transferred, when completion happens, and what happens if payment or documents are delayed.

How Does Vesting Work When A Founder Leaves?

Vesting only helps if it's properly documented. If your share vesting arrangement is clear, it can tell you exactly how many shares the exiting founder keeps and what happens to the rest.

A common setup is four-year vesting with a one-year cliff, then monthly vesting after that. The details can vary, so always use the wording in your own documents.

Worked Example

Say Ava, Ben and Chloe start a Melbourne SaaS company. Each receives 1,200,000 shares, subject to four-year vesting with a one-year cliff and monthly vesting after the cliff.

Ben leaves after 18 months. If the vesting is calculated over 48 months, Ben has vested 18 out of 48 months, which is 37.5%.

That means:

• Ben keeps 450,000 vested shares.
• 750,000 unvested shares may be transferred or bought back, if the documents give the company that right.
• The company updates its cap table, share register and ASIC records if required.
• The remaining founders can show investors a cleaner ownership position.

The result could be different if Ben is a bad leaver, if there are acceleration rights, or if the agreement says vesting stops at the date of notice rather than the last working day.

If the vesting clause is vague, don't guess. A small drafting issue can become a large founder dispute, especially before a raise or sale.

What Should Go Into A Founder Exit Agreement?

A founder exit agreement should clearly record the commercial deal and the legal clean-up. It's usually the document that ties together shares, IP, confidentiality, access and future cooperation.

You might hear this called a founder exit deed, founder separation deed or co-founder departure agreement. The label matters less than the clauses inside it.

Founder Exit Agreement Outline

This is a practical outline, not a finished document. A lawyer should tailor it before you use it, because templates often miss the parts that matter for your cap table, IP and investor documents.

1. Parties - name the company, the exiting founder and any remaining founders who need to sign.
2. Background - explain the founder's roles, shareholding and reason for the exit in neutral terms.
3. Resignation - record resignations as director, employee, contractor or officer, with effective dates.
4. Shares And Vesting - state how many shares are vested, unvested, transferred, bought back or retained, including any share buy out terms.
5. Payment Terms - set out price, timing, completion steps and what happens if payment is late.
6. IP Assignment And Confirmation - confirm the company owns all business IP and require any missing assignments to be signed.
7. Confidentiality - keep business plans, code, customer data, pricing and investor information confidential.
8. Return Of Property And Access - list devices, documents, accounts, keys, passwords and admin rights to be returned or removed.
9. Non-Disparagement And Announcements - agree how the exit will be communicated to staff, customers and investors.
10. Release And Future Claims - deal with known claims carefully, especially if employment rights are involved.
11. Cooperation - require help with handover, ASIC updates, IP filings or investor due diligence.
12. Dispute Process - set out negotiation or mediation steps before things escalate.

If your co-founder was an employee, be careful with releases. Some employment entitlements can't simply be signed away, and final pay still needs to be handled properly.

How Do You Protect IP, Confidentiality And Systems Access?

You protect them by confirming ownership in writing, tightening confidentiality obligations and removing access immediately but carefully. This is often the most urgent part of the exit.

IP can be messy in early-stage startups because founders often build before the paperwork catches up. In Australia, copyright is generally owned by the person who creates the work, unless an exception applies or there's a written assignment. If your co-founder wrote code as an employee in the course of employment, the company may own it. If they built it before employment started, or as a contractor, you may need a written IP assignment.

Check IP for:

• software code, repositories and product documentation
• logos, brand names, designs and website content
• domain names, social media handles and app store accounts
• customer lists, sales scripts, pricing models and pitch decks
• patentable inventions, trade marks and designs filed with IP Australia

Then work through access. Remove or change access to:

• email, cloud storage and internal messaging tools
• source code repositories and deployment tools
• banking, payment platforms and accounting software
• CRM systems, analytics, ad accounts and customer databases
• ASIC, ABR and domain name accounts

Keep a record of what you changed and when. Don't delete accounts without checking whether you need business records, source history or audit trails.

If your startup handles personal information, keep your Privacy Act 1988 obligations in mind. An ex-founder shouldn't retain customer data on personal devices, personal email or private drives.

What Company Records And Investor Updates Need To Be Fixed?

You need to update your internal records first, then make any required external filings and investor notifications. Clean records make future due diligence much easier.

For an Australian company, check whether you need to update:

• ASIC Records - directors, secretaries, share issues, share cancellations or member changes are commonly updated through ASIC Form 484, generally within 28 days.
• Company Register - update the member register, option register and any director or officeholder registers.
• Cap Table - show the final share position after transfers, buy-backs or vesting outcomes.
• Board Minutes And Resolutions - record approvals for resignations, share transfers, buy-backs, access changes and execution of documents.
• Share Certificates - cancel and issue certificates if your company uses them.
• Employment And Payroll Records - final pay, leave balance, superannuation and termination records if the founder was employed.
• Investor Notices - check whether your shareholders agreement or SAFE, note or investment documents require notice or consent.

Investors usually care about two things: whether the departing founder still owns a large chunk of the business, and whether the company clearly owns the IP. If you can answer both with signed documents and clean records, the exit is less likely to derail a raise.

If your company has an ABN and ACN, remember they do different jobs. The ACN identifies the company under ASIC, while the ABN is used for business and tax system registrations. A founder exit usually affects ASIC records and company registers first, not the ABN itself.

What If The Exit Has Turned Into A Startup Founder Dispute?

If a dispute has started, focus on stabilising the business before arguing about who is right. Your first steps should protect evidence, systems, staff, customers and the cap table.

Start with this order:

1. Collect The Documents - shareholders agreement, constitution, vesting deed, employment contract, IP assignments, board minutes and emails about the exit.
2. Preserve Evidence - keep messages, code logs, access logs, meeting notes and version history. Don't delete records because they're uncomfortable.
3. Secure Systems - remove access that creates business risk, but keep audit trails and business records intact.
4. Keep Communications Calm - use neutral wording with staff, customers and investors. Avoid blame, especially in writing.
5. Check Decision-Making Power - confirm who can approve transactions, sign documents and speak for the company.
6. Get Tailored Advice Early - founder disputes can affect shares, director duties, employment issues and IP all at once.

Director duties under the Corporations Act 2001 still matter during a dispute. If your co-founder remains a director, they may still owe duties to act with care and diligence, in good faith and for a proper purpose. The remaining directors have duties too, so don't use company processes purely as leverage in a personal disagreement.

If your documents include a negotiation or mediation clause, follow it. A properly handled dispute process can preserve the business relationship enough to finalise the exit and keep the company moving.

Key Takeaways

• A co-founder resignation doesn't automatically deal with shares, vesting, IP, confidentiality or systems access.
• If vesting is documented, calculate what has vested and follow the agreed transfer or buy-back process.
• If there's no clear leaver clause, your exiting co-founder may keep their shares unless you negotiate a deal.
• IP ownership should be confirmed in writing, especially for code, branding, content, domains and product assets.
• ASIC updates, registers, board minutes, payroll records and investor notices should be fixed promptly.
• If the exit becomes a dispute, protect records and access first, then get tailored help before positions harden.

If you'd like help with your founder exit agreement, share transfers or vesting, IP confirmation and company records, you can reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.