Cofounder Left Early: What Happens to Their Equity?

A cofounder left the company eight months in. They still hold 35% of the stock, there is no vesting agreement anywhere in your files, and every conversation about it ends with somebody changing the subject.

Here is the part nobody wants to say out loud first: as a legal matter, those shares are theirs. When a cofounder left the company and there was no vesting agreement, nothing automatically happens to their equity. Vesting is the mechanism that takes stock back. Without it, there is no trigger, no forfeiture, no clawback. They walked out with a permanent claim on everything you build for the next decade.

But "legally theirs" and "unrecoverable" are different sentences. You have more leverage than you think, and there are exactly two strategies worth considering. Almost everything written about founder vesting tells you to set it up in advance. This is about the after.

What happens to a cofounder's equity when they leave and there's no vesting agreement?

They keep all of it. If the shares were properly issued and there is no vesting schedule, no repurchase right, and no shareholder agreement with a departure provision, the departing cofounder remains a full owner of that percentage forever, diluted only by future financings the same way you are.

That means they get paid at exit. They get their pro rata slice of an acquisition. Depending on your state and entity type, they may have inspection rights over your books. And if they hold enough, they can block a financing that requires a supermajority stockholder vote.

This is the situation Noam Wasserman was pointing at in The Founder's Dilemmas (2012), where he found that roughly 65% of high-potential startups fail because of conflict among the founding team. The equity is rarely the cause. It is usually the thing that makes the conflict permanent.

Before you negotiate anything, check whether they actually own the shares

A surprising number of early cap tables are aspirational. Founders agree on a split, write it in a deck, and never complete the paperwork that makes the stock real. If that is your situation, your negotiation changes completely.

Go find these five things:

• A signed stock purchase agreement or subscription agreement in their name, with a share count on it.
• A board consent or incorporator action authorizing that specific issuance.
• Evidence they paid. Common stock at incorporation is usually priced at $0.0001 per share. For 3.5 million shares that is $350. Did a check clear? Is there a wire?
• An entry in the stock ledger or your Carta/Pulley record showing the issuance date.
• Their 83(b) election, filed with the IRS within 30 days of purchase under Section 83(b) of the Internal Revenue Code, if the shares were restricted.

Say you find nothing but a Slack message that reads "cool, 65/35, let's go." Their 35% is not stock. It is an unperformed promise, and a promise is negotiable in a way that issued property is not. They still have an argument (promissory estoppel and breach of an oral agreement are real claims, and a judge may well find one), but you are no longer asking them to give something back. You are deciding together what to issue.

Do this before you make any offer. The check takes an afternoon and it determines which of the following two strategies you are even running.

The two real options: Buy Them Out or Dilute Them Down

There are only two ways to reduce a departed cofounder's ownership when the original paperwork is silent. You buy the shares back with their signature, or you issue new shares and shrink their percentage without it.

Everything else people suggest is a variation on one of these. "Convert them to an advisor" is Buy Them Out with a smaller check. "Recapitalize at the Series A" is Dilute Them Down with investor cover.

When does buying out a departed cofounder's equity actually work?

Buying out works when the departing cofounder wants closure more than they want the lottery ticket, and when you can put real money or a real note in front of them. It fails when they price their shares off an imagined exit instead of today's reality.

The price problem is where most of these die. Your 409A says common stock is worth $0.03 a share. Their 1.75 million shares are therefore "worth" $52,500 on paper, and worth $350 if you price at original cost. Offer them $350 and you will get a version of this back:

"You want me to hand over three years of upside for the price of a used laptop. No."

They are not wrong to react that way, and arguing about 409A methodology with someone who spent eight months building your product is a losing use of a Saturday. The real gap is not $350 versus $52,500. It is what the shares are worth to you to have back, which is meaningful money, against what they are worth to hold, which is an illiquid claim with no exit date and no information flow.

So structure around that asymmetry. Deals that close tend to combine:

• Cash now, sized to something they can feel. Even $10,000 to $40,000 at pre-seed reads as respect rather than an insult.
• A promissory note for the balance, payable over 12 to 24 months or on the next priced round, whichever comes first.
• A retained sliver. Letting them keep 2% or 3% outright often costs you less than fighting over 35%, and it gives them a reason to say yes today.
• A named tail. Either explicitly grant them a payment if the company is acquired within 12 months, or explicitly state there is none. Silence here is what produces the phone call two years later.

Where it breaks: they have retained a lawyer on contingency, they refuse to name a number, or their number is 5x what a standard four-year schedule would have given them. Also, if you have $9,000 in the bank and no near-term round, a cash buyout is a fantasy and you should stop pretending otherwise.

When does diluting a departed cofounder work, and when does it blow up?

Diluting works when you have legitimate business reasons to issue new equity anyway: hiring, an option pool expansion an investor is demanding, or refresh grants for the founders still doing the work. It blows up when the only purpose is to shrink one person, and a court can tell.

The clean version happens at a priced round. Your Series A investor looks at the cap table, sees 35% held by someone who left before the product shipped, and refuses to fund it. That investor then insists on a recapitalization or on large refresh grants to the active founders, subject to proper four-year vesting this time. Their insistence is your business purpose. It is documented in their term sheet. That is defensible.

The version that goes wrong: three remaining founders hold a board meeting, authorize 4 million new shares to themselves at $0.0001, and tell nobody. Under Delaware law, when a controlling group's transaction benefits itself at a minority holder's expense, courts apply the entire fairness standard (the framework Delaware has used since Weinberger v. UOP, 1983). That shifts the burden onto you to prove both fair dealing and fair price. Your Slack history becomes evidence. A single message reading "this washes him out to 4%" is worth more to their lawyer than anything else in the file.

Two more failure modes. If the departed cofounder sits on your board and you have not removed them, they see the resolution and vote against it. And if they hold 35% while your charter needs a majority of common to authorize new shares, they simply say no and you are back where you started.

Dilution also does not fully solve diligence. An acquirer's counsel will still ask why a founder with 12% has no vesting documentation, no IP assignment, and no release.

How do you document a negotiated clawback when there's no vesting agreement?

You write a stock repurchase and separation agreement, and you make it more thorough than feels necessary for the amount of money involved. The document is not really about the shares. It is about making sure this conversation never reopens.

Anchor the negotiation on time served rather than on grievance. If they were in for eight months and the market default is four years with a one-year cliff, they earned 8 of 48 months. That is 16.7% of their 35%, or roughly 5.8% of the company. Open there, then add something for goodwill and speed. Saying "here is what a normal vesting schedule would have given you, and we're offering more than that to close this week" is a defensible position that does not require either of you to relitigate who worked harder in March.

If you can still speak civilly, run the conversation as a structured negotiation with the terms written down as you go rather than as another eleven-message email thread. Tools like Servanda give cofounders a place to put terms in writing while they are still being negotiated, which matters because the version in your head and the version in theirs are not the same version.

The agreement itself needs, at minimum:

1. Exact share count and certificate or issuance reference. Not "all shares held by."
2. Price, payment schedule, and what happens on default if there's a note.
3. A mutual general release covering all claims through the signing date, both directions.
4. Confirmation of IP assignment, including a present assignment of anything they built that was never properly assigned. This is often the most valuable clause in the document.
5. Acknowledgment that they had the opportunity to consult counsel and that the company made no representation about the current or future value of the stock.
6. Resignation from all officer, director, and employee positions, dated.
7. Termination of information and inspection rights.
8. The tax handling. A repurchase above their basis is a taxable event to them. Say who issues what form.
9. Non-disparagement, mutual, and narrow enough that they'll actually sign it.

Have a lawyer draft or review this. A cofounder buyback is one of the few places where $2,500 of legal spend at pre-seed is obviously correct.

Which approach would we pick?

Buy Them Out. Nearly always, and pay more than feels fair.

The reason is not sentiment. A signed release with an IP assignment is an asset that survives diligence, survives an acquisition, and survives the moment three years from now when your former cofounder reads a funding announcement and starts doing math. Dilution buys you a cleaner percentage and leaves the underlying claim alive. You will meet it again at the worst possible moment, which is always during a term sheet.

Switch to Dilute Them Down under three conditions, and only with counsel drafting the resolutions. First, they have declined to engage with two written offers over 60 days, and you have the emails to show it. Second, their demand exceeds roughly 3x what a standard four-year schedule would have given them, which tells you they are negotiating against a fantasy and no amount of cash closes it. Third, you have a priced round inside six months where an investor is independently requiring a cap table cleanup, giving you a business purpose you did not manufacture.

And if you find during your document hunt that the shares were never properly issued, do not treat that as a weapon. Treat it as room. Offer them a real grant, properly papered, with vesting credit for the months they served, in exchange for a release. That is the outcome where nobody spends 2026 in a deposition.