Firing a co-founder: the legal mechanics and the emotional playbook
The 7-step sequence, what happens to vested and unvested equity, and the 72-hour investor brief that stops a departure from spiraling into a cap-table crisis.
Firing a co-founder: the legal mechanics and the emotional playbook
Firing a co-founder is mostly a contract problem layered on a human one. If you set up reverse vesting at incorporation, unvested shares snap back to the company cheaply and vested shares stay with the departing founder unless you buy them back. The rest is sequencing: board conversation, termination, cap-table cleanup, investor brief, team announcement, in that order.
Most founders mishandle firing a co-founder in two predictable ways. They drag out the decision until it's an open secret with the team, and they hide the departure from investors instead of controlling the narrative with a short brief. Both cost more than the termination itself.
The mechanics are rarely the hard part. Reverse vesting, a clean leaver clause, and a one-page board resolution do most of the work. Use the following sequence.
How to fire a co-founder: a 7-step sequence
This is the clean path when one founder is terminating another who is also a director and a shareholder.
- Preview with individual board members privately before the full board call, per Fenwick guidance on constructive pre-meeting disclosure.
- Hold the board meeting, pass a resolution approving the termination and the share repurchase.
- Deliver the termination in person (or video if remote), same day as the board vote. No email-first terminations, ever.
- Execute the repurchase of unvested shares at the lower of cost or fair market value, per standard Cooley founder-stock terms.
- Negotiate the vested-share outcome: keep, buy back, or recapitalize. Document in a separation agreement with mutual releases.
- Brief investors within 72 hours via a one-page memo covering cause, cap-table effect, and operational coverage.
- Announce to the team after investors are notified, not before.
What happens to a fired co-founder's equity
Unvested shares snap back to the company at a nominal price. Standard founder stock is issued with reverse vesting and a repurchase right at the lower of cost or fair market value, so the moment a founder is terminated, everything that has not yet vested returns to the option pool or treasury at the price they originally paid, often a fraction of a cent per share (Cooley).
Vested shares stay with the departing founder by default. US practice is time-based vesting over four years with a one-year cliff (Wilson Sonsini), and anything earned through the cliff is theirs unless your docs contain a bad-leaver clause or a vested-share buyback right.
UK and European deals are different. Negotiated leaver provisions are common, and a bad-leaver classification can trigger 100% forfeiture of shares at a nominal repurchase price (Wilson Sonsini). Read your shareholders' agreement before you assume anything about the outcome.
Removing a co-founder with vested shares: buyback or recapitalization
You have three options for vested equity, and the right one depends on your cash position and cap-table headroom. Most founders default to a cash buyout because it feels clean; often recapitalization at the next round is the better tool.
| Option | When it fits | Tradeoff |
|---|---|---|
| Leave vested shares outstanding | Departing founder was in good standing, small stake, no operational friction | Dead equity on the cap table indefinitely |
| Cash buyback of vested shares | You have the cash, want a clean break, both sides agree on price | Depletes runway; price anchoring is hard |
| Recapitalization at the next round | Large vested stake, incoming investors willing to reprice | Needs lead-investor buy-in; signals instability if botched |
Price anchoring on a buyback is the negotiation. There is no market benchmark because each situation is private; common anchors are the last preferred-round price (too high, gives the leaver a windfall), the 409A common price (too low, usually rejected), or a midpoint. Get a fresh 409A before the conversation.
Recapitalization is underused. If the departing founder has a large vested stake and you are months from a priced round, the incoming lead can require a recap that cuts the leaver's stake as part of the term sheet. Seed-round median dilution already runs around 20.1% (Carta), so a modest additional top-up for the lead is often tolerable when framed correctly.
The investor comms brief for a co-founder breakup
Lead, don't hide. Investors find out within two weeks through back-channels, and finding out second is a trust event. Send a one-page brief within 72 hours of the termination.
The brief covers four things: what happened in one sentence, why in two sentences, what changes operationally in three bullets, and what you need from them (usually nothing). Do not apologize. Do not over-explain. Partners read dozens of these a year and they want the facts, not the arc.
✅ Good: "Co-founder X left the company on Tuesday. We were misaligned on pace and it was the right call for both sides. Y is taking over engineering; the two open roles are already backfilled. No ask, just keeping you informed." Why it works: factual, neutral, closes the loop. ❌ Bad: "I wanted to reach out and share some difficult news. After a lot of reflection and tough conversations..." followed by three paragraphs of context. Why it fails: reads as defensive, signals instability, invites follow-up questions you don't want.
The timing trap in every co-founder dispute
The number-one mistake in a co-founder dispute is waiting. By the time most founders move, the team already senses it, execution has been slowing for months, and the board is wondering what's wrong. A six-week delay turns a clean co-founder departure into a morale event.
The signal that it's time: you've had the same conversation three times with no change. If you are rehearsing the termination speech in your head, the team has already noticed.
Make the call, run the seven-step sequence, and move on. The company recovers faster than you expect if you do not drag it out.
FAQ
How do you fire a co-founder? Hold a board meeting to approve the termination and share repurchase, deliver the news in person the same day, execute the repurchase of unvested shares, negotiate the vested-share outcome, and brief investors within 72 hours before announcing to the team. The mechanics sit in your founder stock purchase agreement and bylaws.
What happens to a fired co-founder's equity? Unvested shares are repurchased by the company at the lower of cost or fair market value, typically a nominal amount. Vested shares remain with the departing founder by default unless a bad-leaver clause or vested-share buyback right applies. UK deals more often include negotiated leaver provisions that can forfeit vested shares.
Can you buy out a co-founder's vested equity? Yes, but only by negotiation. The company has no automatic right to vested shares under standard US founder stock terms. A buyout is typically priced between the 409A common price and the last preferred round price, paid in cash or structured as a recap at the next round.
How do you explain a co-founder departure to investors? Send a one-page brief within 72 hours covering what happened, why, what changes operationally, and what you need from them. Lead with the facts, do not apologize, and do not hide the event. Investors react to concealment, not to departures.
What is a 'bad leaver' and how does that affect share repurchase price? A bad leaver is a founder terminated for cause (fraud, gross misconduct, material breach) under a shareholders' agreement. Bad-leaver status typically triggers forfeiture of up to 100% of shares, including vested, at a nominal repurchase price. US deals rarely include bad-leaver clauses; UK and European deals usually do.
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