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Equity Disputes Between Founders: Who Owns What When the Startup Grows?

Equity Disputes Between Founders: Who Owns What When the Startup Grows?

Launching a startup with co-founders is exhilarating as you share a vision, energy, and purpose. But as the business evolves, so do individual contributions, roles, and expectations. When those shifts aren’t reflected in your ownership structure, tension builds. Before long, what started as a small disagreement can spiral into a founder equity dispute that threatens both the business and relationships.

This guide walks you through how equity disputes arise, what they look like in practice, and how to prevent or resolve them. Think of it as a short consultation in blog form, the same principles we teach founders at Allied Legal every week.


Understanding Founder Equity Disputes

A founder equity dispute occurs when co-founders disagree about ownership percentages, contributions, or control. It’s not always about greed, as it’s often about misalignment between expectations and documentation.

Common triggers based on our experience

  • Unequal contribution recognition: One founder feels they’ve done more than their shareholding reflects.
  • Dilution after investment: Raising capital can change ownership percentages, leading to resentment.
  • Changing roles or founder exits: A founder may reduce their involvement or leave entirely, raising questions about what happens to their shares.
  • Decision-making deadlocks: Differing visions or control over key decisions can escalate into equity-related disputes.

Let’s unpack what this looks like in practice.


Scenario: Jane and Mark’s Health Tech Startup

Jane and Mark co-founded a Sydney-based health tech startup, agreeing on a 50/50 equity split at launch. Over time, Jane brought in clients and capital, while Mark focused on operations. When they began fundraising, Jane argued her contribution justified a larger share. Mark disagreed.

Without a shareholders agreement or vesting schedule, the dispute stalled investment and strained their relationship.

This is a classic founder equity dispute. Two founders with evolving contributions but a static ownership structure. It’s rarely about the money alone; it’s about fairness and recognition.

Ask yourself, if your startup doubled in size tomorrow, would your current equity split still feel fair? If the answer is no, now is the time to review your structure.


The Legal Framework in Australia

In Australia, equity ownership and disputes are governed primarily by the Corporations Act 2001 (Cth), along with your company’s constitution and shareholders agreement.

Shareholders Agreement

This document is the foundation of any startup’s structure. It sets out:

  • Ownership percentages and how shares are issued
  • Voting rights and decision-making rules
  • What happens if a founder leaves
  • Vesting schedules and buy-back rights
  • Dispute resolution mechanisms

At Allied Legal, we often see startups operating without a shareholders agreement or using a generic template that doesn’t reflect their real-world dynamics. This is risky and often the source of later disputes.

Company Constitution

The constitution governs internal operations such as share transfers, director powers, and voting rights. It complements your shareholders agreement and provides additional legal structure.

Employment and IP Assignment Agreements

Every founder should sign an IP assignment agreement ensuring the company owns the intellectual property they create. Disputes often arise when this isn’t clearly documented.

Vesting and Milestone Clauses

Vesting schedules are a smart way to align equity with contribution. Shares are earned gradually over time or upon hitting milestones, protecting the startup if someone leaves early.

Example: A 4-year vesting schedule with a 12-month cliff means a founder earns 25% of their shares each year. If they leave before 12 months, they get nothing.


Common Types of Founder Equity Disputes

  1. Disputes Over Initial Equity Split

Many founders split equity based on enthusiasm rather than contribution. Over time, as roles evolve, one founder feels shortchanged.

Try this: Create a contribution matrix listing what each founder brought to the table: time, capital, skills, IP, and opportunity cost. You’ll quickly see if your equity split matches reality.

  1. Dilution Conflicts

New funding rounds often dilute existing shares. If founders haven’t planned for this, disagreements can arise over who loses more control.

Before your next round, ask:

  • How will this dilution affect each founder’s voting power?
  • Are there anti-dilution clauses or pre-emptive rights in place?
  1. Exit or Departure Disagreements

When a founder leaves, tension arises over whether they should keep their shares or sell them back. Without a buy-back mechanism or vesting clause, the situation can become messy fast.

  1. Intellectual Property Ownership

Founders sometimes claim ownership of key IP after leaving, especially if they developed it before incorporation. A clear IP assignment agreement can prevent costly disputes later.

 

How to Prevent Founder Equity Disputes

Let’s get practical. Here’s how to build a structure that prevents equity issues before they happen.

  1. Put Everything in Writing

Avoid handshake agreements. Every discussion about ownership, roles, or contributions should be documented in a shareholders agreement.

  1. Use Vesting to Align Incentives

Vesting ensures founders earn their equity over time, keeping everyone motivated and reducing tension if someone leaves early.

  1. Define Roles and Responsibilities Early

Misunderstandings about effort or expectations often lead to resentment. Clearly outline each founder’s scope, KPIs, and decision-making authority.

  1. Plan for Dilution and Funding

Discuss how future investment rounds will impact ownership. Include these terms in your shareholders agreement to avoid surprises.

  1. Build in Dispute Resolution Mechanisms

Include mediation and arbitration clauses. They give founders a path to resolve disputes without going to court.

 

Founder Checklist: Avoiding Equity Disputes

☑ Draft a shareholders agreement early
☑ Include vesting schedules and exit terms
☑ Document roles and contributions
☑ Assign IP rights to the company
☑ Review equity before fundraising
☑ Revisit agreements every 12–18 months

We always tell our clients: your shareholders’ agreement is a living document, it should evolve as your startup grows.

 

How to Resolve an Existing Founder Equity Dispute

If you’re already facing conflict, here’s the approach we typically recommend to clients.

Step 1: Talk First

Have an honest discussion about contributions, expectations, and goals. A well-facilitated conversation can often prevent escalation.

Step 2: Bring in a Mediator

A neutral third party can guide the discussion and help you find a fair middle ground.

Step 3: Seek Legal Advice

A startup lawyer can review your documents, explain your rights, and help negotiate a solution that protects your company’s value.

Step 4: Litigation as a Last Resort

Court action under the Corporations Act should be a final step. It’s costly, public, and can damage your brand and investor confidence.

 

Before You Grow Further…

Before your next funding round, product launch, or new hire, take a moment to assess your equity arrangements.

Ask yourself:

  • Does my shareholders agreement reflect today’s reality?
  • Would I feel confident explaining our equity split to an investor?
  • Are our roles, vesting, and exit terms clearly documented?

If not, now is the time to fix it, not after conflict arises.

 

How Allied Legal Can Help

At Allied Legal, we work closely with Australian startups to structure and protect founder relationships. Our lawyers specialise in:

  • Drafting and reviewing shareholders agreements and vesting arrangements
  • Advising on equity structuring, dilution, and exit terms
  • Mediating and resolving founder equity disputes
  • Ensuring your IP and contribution agreements are watertight

We understand the unique dynamics of startups and approach every situation with commercial empathy and legal precision. Whether you’re forming your founding team or resolving an existing dispute, our goal is to protect your business and preserve your relationships.

If you’re facing a founder equity dispute or simply want to future-proof your startup’s structure, reach out to Allied Legal today.

Rahul Kumar

Rahul Kumar

Rahul Kumar is the founder of Allied Legal and a seasoned corporate lawyer with over 19 years of experience advising on complex corporate law matters. A recognised specialist in the startup and scaleup space, Rahul has a deep understanding of the legal and commercial challenges faced by high-growth businesses.

Having worked at both national and international firms, his expertise spans corporate structuring, capital raising, shareholder arrangements, mergers and acquisitions, and strategic governance.