When a Co-Founder Quits Early: What Happens to Their Shares and Code

First, establish what was actually signed

The same departure can be a routine paperwork exercise or a dispute that blocks the next financing. The difference is almost entirely in documents signed months earlier. Before talking terms with the departing founder, gather:

• Formation documents. Was a corporation or LLC actually formed, and when?
• Stock issuance. Board consent issuing founder shares, the number, and the price paid.
• Restricted stock purchase agreement. Whether it includes vesting, a cliff, and a company repurchase right, and the deadline for exercising it.
• IP assignment. A technology assignment covering work done before incorporation, and a confidential information and invention assignment agreement, often called a CIIAA, covering work after.
• Board and officer roles. Whether the departing founder is a director, an officer, or both.
• 83(b) election. Whether one was filed, which matters for the founder's tax position.

This page describes common US arrangements in general terms. It is informational, not legal advice; state law and the specific documents control, so take counsel before acting.

If founder vesting is in place

Founder shares under a standard schedule vest over four years with a one year cliff. At eight months, nothing has vested. The departing founder holds the shares, but the company has a right to buy back all of the unvested ones, usually at the price originally paid, which at formation is often a few hundred dollars in total.

That right is not automatic in every agreement. Many require the company to give written notice and pay within a fixed period after the departure, and if that window passes, the right can lapse and the founder keeps the shares. Some agreements make repurchase automatic. Read the clause before the clock runs.

The usual sequence:

1. Confirm the termination date and the number of unvested shares.
2. The board approves exercising the repurchase right.
3. The company sends written notice and pays the repurchase price.
4. The shares are cancelled or returned to treasury, and the stock ledger and cap table are updated.

A director seat does not end with employment. The founder can resign, and otherwise directors can generally be removed by stockholder vote under the company's charter and state corporate law. Officer titles are removed by the board.

Who owns the code

This is the question investors and acquirers check in diligence, and the one most often overlooked.

Under US copyright law, code written by an employee within the scope of employment belongs to the employer. An unpaid co-founder is often not an employee in that sense, and code written before the company existed belongs to its author. A transfer of copyright must be in writing and signed. So without a signed assignment, the departing founder may own some or all of the codebase, even if it runs the product.

With a technology assignment and a CIIAA in place, the company owns the work product, and the departure does not change that.

Without them, a confirmatory IP assignment from the departing founder is the single most important thing to obtain. It should cover all work related to the business, before and after incorporation, and include an obligation to sign further documents if needed. Rewriting the code is the fallback, and it is slower and less certain than it sounds.

If there are no documents

No entity at all. Two people working together on a business for profit, with no company formed, may be treated as a general partnership by default under the law of many US states. Each partner can then have a claim to the business and its assets. Resolve the split in writing before forming the company or moving the work into it.

A company, but no vesting. The departing founder owns their shares outright. Nothing in the documents obliges them to return any. The options are negotiated: a voluntary sale back to the company at an agreed price, a transfer to the remaining founders, or a smaller retained stake in exchange for a release and IP assignment.

Shares promised but never issued. Emails and messages about a split can support a claim. A written settlement that states exactly what, if anything, the departing founder receives closes it.

What to do now

1. Collect the documents above and identify the repurchase deadline.
2. Secure company assets. Domains, cloud accounts, code repositories, and app store accounts should be controlled by the company. Change shared credentials.
3. Draft one separation agreement covering share repurchase or settlement, a confirmatory IP assignment, resignation from board and officer roles, return of property and access, confidentiality, and a mutual release.
4. Exercise the repurchase right formally if vesting exists, and update the cap table.
5. Fix the gaps for everyone remaining. Put vesting and IP assignments in place for the founders who stay, so the next departure is routine.
6. Tell existing investors if there are any, since most will hear about it in diligence anyway.

The departing founder has their own interests and may take their own advice. A fair, fast offer usually costs less than a dispute that sits on the cap table through the next financing.