Where a Company Is a Citizen

Federal courts hear cases between citizens of different states, and the word doing the work in that sentence is citizens. For a human being, citizenship means domicile, which is a question of where a person intends to remain. For a business, it means something entirely different, and it means different things depending on how the business was formed. Getting it wrong is not an academic error. It is the single most common reason a case that spent a year in federal court is sent back to the state court it came from.

The two citizenships of a corporation

A corporation is a citizen of two states at once: the state under whose laws it was incorporated, and the state where it has its principal place of business. Both count. A company incorporated in one state and headquartered in another is diverse from nobody in either of those two states, and complete diversity fails if any opposing party is a citizen of either.

The first half is mechanical. Incorporation is a matter of record, it appears on the certificate, and it does not change because the business moved. A company formed decades ago in a state it has since left entirely remains a citizen of that state until it formally reincorporates elsewhere. Nothing about the volume or location of its trade alters this.

The second half is where the argument happens. The principal place of business is not the state with the most employees, the most revenue or the most floor space. It is the nerve center: the single place from which the corporation's officers direct, control and coordinate its activities. In practice that is the headquarters, provided the headquarters is a real one where decisions are actually taken rather than an address maintained for appearances. A company that runs its entire operation from a single office has an easy answer. A company whose executives are dispersed has a harder one, and the inquiry then looks for where the direction actually originates rather than dividing the answer between candidates.

The rule is deliberately singular. There is one nerve center, and the statute does not contemplate two. That singularity is what makes large national defendants diverse from plaintiffs in most of the country, and it is why counting up state-by-state activity produces an answer the court will not accept.

Unincorporated entities follow their members

Partnerships, limited liability companies, limited partnerships and unincorporated associations are treated in a completely different way. They have no citizenship of their own. Instead they carry the citizenship of every one of their members, and they carry all of them at once.

The consequences are easy to underestimate. A limited liability company organized in a single state, with its only office in that state and all of its trade conducted there, is a citizen of that state and of every other state where a member is domiciled. One member who retired to a warmer state takes the company's citizenship with them. Nothing in the company's name, filings or public presence discloses this.

Worse, membership is traced all the way down. If a member is itself a limited liability company, that entity's members are counted too, and if one of those is a partnership, its partners are counted after that. A three-layer ownership structure can produce dozens of citizenships, any one of which can defeat diversity. There is no ceiling on the tracing and no rule that stops at the first entity layer.

The practical instruction that follows is simple: never plead the citizenship of an unincorporated party by reference to where it was organized or where it is based. Plead the members, and if a member is an entity, plead its members. A court asked to take jurisdiction on an allegation that a company is "a Delaware limited liability company with its principal place of business in Texas" is being told nothing at all, and increasingly it will say so.

Two situations recur often enough to be worth naming. The first is the entity whose membership changed after the events in dispute but before suit: citizenship is measured at filing, so the membership that matters is the one existing on the day the complaint was lodged, not the one that existed when the contract was signed. The second is the entity in the process of dissolving. A limited liability company that has wound up but not yet canceled its registration still has members for this purpose, and their citizenships still count; a company whose cancellation is complete may have no members at all, which raises the separate question of whether it can sue or be sued in its own name under the law of the state that formed it.

Trusts sit awkwardly between the two rules and deserve care rather than assumption. A traditional trust sued through its trustee takes the trustee's citizenship. An entity that calls itself a trust but is organized as a business with shareholders is treated as an unincorporated association and takes the citizenship of every one of them. The label on the instrument decides nothing; the structure does.

When citizenship is measured

Citizenship is fixed at the moment the complaint is filed. Later changes are irrelevant: a defendant who moves after suit begins does not create or destroy jurisdiction by moving, and a company that reincorporates mid-case does not alter the analysis. This is a rule of convenience and it works in both directions.

A removed case has a second measuring point. Because removal depends on the case being one that could originally have been brought in federal court, the parties' citizenship must support diversity both when the action was filed in state court and when the notice of removal is filed. A party whose presence defeated diversity at filing but who has since been dismissed can therefore open a door that was previously closed, which is one of the few situations where the passage of time helps. The deadline for filing that notice runs separately and is not extended by the time spent working out citizenship.

Pleading and proving it

Federal practice now requires a disclosure statement identifying the citizenship of every member of an unincorporated party when jurisdiction rests on diversity, which exists precisely because parties were pleading conclusions rather than facts. Treat it as the minimum rather than the ceiling.

Where the other side's membership is genuinely unknown — a common position for a plaintiff facing a privately held company — the answer is not to guess. Jurisdictional allegations may be amended, and limited discovery directed at citizenship is routinely permitted before the merits begin. Both routes are far cheaper than the alternative, which is discovering the defect after judgment. Choosing correctly at this stage is part of the wider question of whether complete diversity exists at all, and it interacts with the amount in controversy, which has to be satisfied independently.

None of this makes the federal forum better or worse than the state one. It simply makes the choice real. A case filed or removed on a citizenship allegation that has not been checked is a case with a defect built into its foundation, and the defect does not decay with time.