How to renegotiate a cofounder equity split

To renegotiate a cofounder equity split, first check that the facts behind the original split have really changed, such as hours, role or risk. Then raise it early, bring numbers instead of a fairness argument, rebalance with new grants rather than clawing back vested shares, and write the new terms into your founder agreement.

When is renegotiating equity justified?

When the assumptions behind the split have changed. A bad week does not count. Collabs HQ lists significant shifts in responsibilities or the value of contributions, and founders joining or leaving, as reasons to restructure.

Real triggers look like this:

• A founder who joined part-time is now full-time and carries most of the load.
• A founder who owned a function has stopped doing that work, and someone else picked it up.
• A co-founder left, and the work they did was shared out without anyone's percentage changing.

Vague unhappiness is different. If one founder keeps asking for more without a specific change behind it, the split is probably not the real issue. Start with our piece on cofounder equity resentment before another round of bargaining.

When should you do it?

As early as you can. A change is cheapest while you are still inside the vesting cliff, before the company has much value and before investors hold a stake. After that, it stops being a talk between two people.

It is still possible later. One founder on Other Cofounder describes resplitting twice, the second time because the velocity of the business was different from what we both expected. Their conclusion: you can resplit, even relatively late. It just costs more the longer you wait.

How do you structure the conversation?

Bring facts you can both check. "I deserve more" is a feeling. "I went from twenty hours a week to sixty, and I now own both functions we used to split" is a fact.

1. Use the same inputs as last time. Hours, role, responsibilities and risk carried. If you used a weighted model, rerun it. Our guide to dynamic equity splits and Slicing Pie shows how to tie ownership to ongoing contribution.
2. Say plainly what changed. Keep it to the facts each of you would agree on.
3. Propose one specific fix. Name a number and a mechanism.
4. Give your co-founder time to respond. A done deal presented as a proposal starts a fight.

Expect it to be hard. Entrepreneur's piece on equity calls renegotiation painful because people assess the quality of past contributions, which rarely leads to consensus. That is why the inputs matter more than the history.

Watch for ultimatums. If your co-founder threatens to quit unless they get more, Entrepreneur warns that if you give into such threats, your co-founder may be able to extort more value out of the company. Negotiate in good faith on the merits. Do not reward the threat.

How do you change the split without a clawback?

Do not take back vested shares. Vested equity is earned, and reaching into it feels like a breach of trust even when the complaint behind it is fair.

Use the company's unallocated option pool instead. Issue new grants, tied to milestones, to the founder now carrying more, sized to the real gap between what they signed up for and what they do today. Existing stakes stay whole, and the fix stays tied to work you can measure. Then put the new terms in your cofounder agreement so they outlast the meeting where you shook hands.

When should you bring in a third party?

When the facts are on the table, the proposal is reasonable, and you still go in circles. That usually means the relationship has taken damage and the equity talk is carrying it.

A coach or mediator does not pick a number for you. They keep the conversation on roles and hours so it does not turn into a fight about worth. Find one through our vetted coaches, or read our cofounder conflict resolution guide. If the split has become one stuck disagreement, a Conflict Session has you each write your side alone, read one summary built from both, and agree what changes together.