What Is a Founders' Agreement?

A founders' agreement is a contract among co-founders that sets out ownership, roles, decision-making, vesting and what happens if someone leaves.

Category: Legal and IP · Reviewed 11 November 2026 · 2 min read

How it works

A founders' agreement records the deal among the people starting a company. Typical topics include who owns what share of the company, who does which job, how decisions are made, what happens if a founder leaves or stops working, and who owns the work done so far. It often includes vesting, which means a founder earns their shares over time, and may include an IP assignment and confidentiality terms.

It is a contract among the founders, and it may sit alongside other documents, such as bylaws or an operating agreement. If the company later forms or changes its structure, some terms are carried into those documents, and the details depend on state law.

Example

For example, three co-founders agree on a 40, 40 and 20 percent split. They state that each founder's shares vest over four years, that one founder is the chief executive, and that deadlocks go to mediation. Two years in, one founder leaves, and the agreement already says what happens to the unvested shares, avoiding an argument.

Why founders care

Most co-founder conflicts come from unspoken assumptions. Writing them down early is much easier than negotiating when someone is leaving or when money is at stake. Investors will usually ask about founder vesting and ownership.

A founders' agreement is not a substitute for legal advice. A lawyer can check that it fits the chosen entity and the state's law, and an accountant can explain tax effects of stock issuance.

Common mistakes

Agreeing to a handshake split with no paperwork.
Splitting equity evenly without discussing roles and commitment.
Skipping vesting, so a departing founder keeps everything.
Leaving out what happens in a disagreement or an exit.

Frequently asked questions