A former friend, contractor, or early collaborator has just told you, in an email, a text, or across your own conference table, that they own a piece of your company. Maybe they helped you get the business off the ground years ago and now say you promised them equity. Maybe they took a smaller salary in exchange for what they call a stake in the company. Whatever the history, the claim lands the same way. It feels like a direct threat to something you built.
You may be wondering whether this claim has any legal weight at all, whether you gave away more than you realized, and what happens if this person repeats the claim to an investor, a lender, or a buyer. Before you respond to them directly, it helps to understand what actually creates ownership in a California business, and what does not.
Why This Matters Right Now
An ownership claim against your business is not a dispute you can set aside for a slow month. Left unaddressed, it can cloud a sale, block a refinancing, complicate a loan application, or scare off an investor who does not want to buy into a company with disputed title. Banks and buyers run litigation and lien searches as a matter of course. A demand letter sitting in a drawer, or worse, a lawsuit already on file, tends to surface at the worst possible time, usually during due diligence on the transaction you were counting on.
California law also gives real weight to informal arrangements between business owners, more weight than most owners expect. That is exactly why a claim like this deserves a careful look, not a reflexive dismissal.
Does a Verbal Promise Actually Give Someone an Ownership Stake?
Not automatically. The answer depends heavily on what happened and what kind of entity you run.
When California Law Presumes a Partnership Exists
Under Corporations Code section 16202, an association of two or more people to run a business together as co-owners for profit forms a partnership, whether or not anyone intended to form one. The statute goes further. A person who receives a share of the profits of your business is presumed to be a partner unless that payment falls into a recognized exception, such as wages for services, payment of a debt, or rent. That presumption means a former collaborator who took a percentage of revenue instead of a flat fee has a real argument, not a frivolous one, even without a signed partnership agreement.
This is one of the more counterintuitive parts of California business law for owners who assumed a handshake and a percentage split meant nothing formal. It can, and sometimes does.
LLC Membership Works Differently Than Simply Working in the Business
If you operate as an LLC, the analysis shifts. Corporations Code section 17701.02 defines an operating agreement broadly enough to include an oral or implied agreement between members, not only a signed document. Under section 17704.01, a person becomes a member either as the operating agreement itself provides, or with the consent of all existing members.
That second path matters here. If you never agreed, in words or through your conduct, to admit this person as a member, and no provision in your operating agreement brought them in automatically, they do not become an owner simply because they worked hard, brought in a customer, or helped shape early strategy. A real claim has to point to an actual admission event, not just a valuable contribution.
Corporate Shares Are Harder to Claim Without Paperwork
Corporations offer the clearest ground to stand on. Corporations Code section 416 entitles every shareholder to a signed certificate, and shares are issued by board action under section 409 in exchange for money, property, or services actually rendered, never a bare promise of future work. If your business is a corporation and this person cannot point to board minutes, a stock certificate, or an entry in your stock ledger, their claim to actual shares is weak on its face, whatever they were told or believed at the time.
Does the Claim Have to Be in Writing to Hold Up in Court?
Sometimes, yes. California's statute of frauds, codified at Civil Code section 1624, requires certain agreements to be in writing, including agreements that, by their terms, cannot be fully performed within one year. Courts have applied that rule to oral and implied partnership and joint venture arrangements, not only to real estate transactions.
In Clarke v. Yu (2026) 119 Cal.App.5th 199, the California Court of Appeal held that oral and implied joint venture agreements are subject to the statute of frauds when, by their terms, they cannot be performed within one year. The alleged venture there was to develop and ultimately commercialize new technology, and the evidence established that developing the technology necessarily would take more than a year. The court therefore held the alleged oral and implied joint venture unenforceable. The key question is not simply whether the parties expected an arrangement to last for years, but whether the agreement itself made complete performance within one year impossible.
That does not mean every unwritten ownership or joint venture claim automatically fails. Depending on the facts, a claimant may argue that another legal doctrine applies, including promissory estoppel or other theories based on reliance. Those arguments are highly fact-specific, however, and the absence of a signed agreement does not by itself determine whether a claim is enforceable.
What if They Never Asked for Equity, Just Worked for It?
A person who cannot establish an actual ownership interest may still have a claim for the value of what they did, under a legal theory called quantum meruit, or for detrimental reliance on a promise, called promissory estoppel. These theories do not hand someone a piece of your company. At most, they can entitle a person to be paid the reasonable value of services performed, similar to an unpaid invoice, if the facts support it.
It is worth separating these two questions early. Is this person actually claiming to own part of your business, or are they really asking to be paid for work they say they were never fairly compensated for? The legal exposure, and the right response, differ for each.
What Happens if This Goes to Court?
If the dispute escalates, understand that proving an oral partnership or joint venture in California does not require the higher clear and convincing evidence standard some owners assume applies to unusual claims. The California Supreme Court settled this question in Weiner v. Fleischman, holding that the ordinary preponderance of the evidence standard applies to oral partnership and joint venture disputes, the same standard used in most civil cases. In practice, that means the person does not need overwhelming proof, just evidence that tips the scale slightly in their favor. That is a lower bar than many business owners expect.
If the claimant is found to actually be a partner, even under an informal arrangement, they gain real statutory rights, including the right under Corporations Code section 16403 to inspect and copy partnership books and records on demand. That possibility is one more reason to take an early, credible claim seriously rather than dismiss it outright.
You are also not required to wait for the other side to sue you. Under Code of Civil Procedure section 1060, you can bring your own action for declaratory relief, asking the court to declare, before there has been any breach or formal dispute, whether this person has an ownership interest at all. For an owner who wants certainty rather than a cloud hanging over the company indefinitely, that proactive option is often worth discussing with counsel.
What Not to Do
Do not respond to the claim in writing before you have talked to an attorney, and do not say anything in a meeting, a text message, or an email that could later read as an acknowledgment of the person's stake, even something as casual as agreeing you will “figure out their share.”
Do not fire, demote, or freeze out the person making the claim as a reflex, particularly if they are still an active partner or employee. That kind of response can look retaliatory and can end up supporting their case rather than protecting yours.
Do not alter, delete, or clean up emails, text threads, accounting records, or cap table documents once you know a dispute exists. That kind of activity can create serious legal exposure of its own, separate from the underlying ownership question.
And do not assume the claim will simply go away if you ignore it. Silence does not resolve a legal question. It only delays the moment you have to answer it, usually on worse terms.
Documents to Gather Before You Call an Attorney
Before your first conversation with a lawyer, pull together the following:
- Formation documents: articles of incorporation, articles of organization, or a partnership statement, if one was filed
- Your operating agreement or bylaws, in whatever form they exist, even informal drafts
- Your stock ledger or membership schedule
- Every tax document that touched this person, including K-1s, 1099s, and W-2s
- Emails, texts, or other written communication where compensation, equity, or a percentage of the business was discussed, even in passing
- Bank records showing who actually contributed capital, and when
- Anything showing how this person was actually treated day to day, whether as an employee, a contractor, or something closer to an owner
When to Bring In an Attorney
Call an attorney as soon as the claim is made in writing, whether that is a text message, an email, or a formal demand letter, and certainly before a lawsuit is filed. You should also involve counsel immediately if the person asserting the claim demands to inspect your books and records, since that specific demand often signals they already believe they have grounds to be treated as a partner.
Waiting until a complaint arrives at your registered agent narrows your options considerably. Getting ahead of the claim, including considering whether to file your own declaratory relief action, generally gives you more control over how and where the dispute gets resolved.
The Takeaway
Not every claim of business ownership holds up, and California law gives you real tools to test whether this one does, from the statute of frauds to the specific rules governing how partners, LLC members, and shareholders actually come into being. At the same time, California recognizes partnerships and joint ventures formed through conduct and oral agreement more readily than most owners expect, so this is not a claim to wave off without a careful look at your own records and history with this person.
Talk to LawPLA About Your Business Ownership Dispute
If someone has told you they own part of your California business, the sooner you get counsel involved, the more options you have to protect your company, your records, and your next transaction. The Law Offices of Parag L. Amin, P.C. works with California business owners statewide on exactly this kind of dispute, from informal partnership claims to LLC membership fights to full litigation. Call our office at 213-293-7881 or reach us through the Contact Form below to set up a confidential consultation and talk through what you are facing.