Controlling Shareholder
An owner whose voting power or practical influence lets it direct the corporation, either generally or as to a single transaction. The label matters because it can trigger heightened review of transactions and duties running to minority owners. Delaware now defines the term by statute. Texas reaches the same problem through fiduciary duty and a narrow statutory oppression remedy.
Control is a functional question before it is a numerical one. A stockholder holding 51 percent of the vote is a controller. So, frequently, is one holding much less who can nonetheless determine the composition of the board or dictate the outcome of the particular transaction being challenged. Getting the label right matters because it changes what a court will do with the deal.
Delaware
Delaware built the doctrine case by case and then, in 2025, codified a definition. Under DGCL Section 144, as amended by Senate Bill 21 effective March 25, 2025, a controlling stockholder is a person who, together with affiliates and associates, holds a majority of the voting power in the election of directors; or has the contractual right to cause the election of a majority of the directors; or holds at least one third of the voting power and also has the power to exercise managerial authority over the business and affairs of the corporation. That last branch is the one that will be litigated.
The consequence is the standard of review. A controller who stands on both sides of a transaction, or who takes a benefit the other stockholders do not share, faces entire fairness rather than business judgment deference. Satisfying the conditions of Kahn v. M&F Worldwide Corp., 88 A.3d 635 (Del. 2014), or now the Section 144 safe harbors, restores deference.
Not every advantage counts as a non-ratable benefit. In Maffei v. Palkon (Del. Feb. 4, 2025), the Delaware Supreme Court held that a controller does not receive a material non-ratable benefit merely because reincorporating the company in another state might reduce future litigation exposure. The court stressed that the decision was made on a clear day, with no pending or imminent claims and no transaction in contemplation, and applied the business judgment rule.
Texas
Texas arrived somewhere considerably less hospitable to minority owners. Texas courts of appeals had developed a common law shareholder oppression cause of action, generally applying a reasonable expectations or fair dealing test, with a court ordered buyout as the customary remedy.
The Supreme Court of Texas dismantled that in Ritchie v. Rupe, 443 S.W.3d 856 (Tex. 2014). The court declined to recognize a common law cause of action for shareholder oppression, reasoning that corporate relationships are governed by statute and contract and that creating the action would disturb the balance the Legislature had struck. It construed the statutory term oppressive, in the receivership provision now codified at Section 11.404 of the Business Organizations Code, to require abuse of authority over the corporation with intent to harm the interests of one or more shareholders, in a manner that does not comport with the honest exercise of business judgment, creating a serious risk of harm to the corporation. It expressly rejected the reasonable expectations and fair dealing tests. And it held that the statute supplies only the remedy it names, a rehabilitative receivership, available only where the trial court finds all other legal and equitable remedies inadequate. No buyout.
What a Texas minority owner has left
Three things, roughly. Directors and officers owe fiduciary duties to the corporation, and breaches are pursued derivatively. Section 21.563 helps materially here: in a closely held corporation, meaning one with fewer than 35 shareholders and no shares listed on a national exchange or regularly quoted over the counter, a court may treat a derivative proceeding as a direct action and order recovery paid directly to the plaintiff, which strips out much of the procedural apparatus. Separately, a formal or informal fiduciary relationship may exist on particular facts, though Texas does not presume that a majority shareholder owes a broad fiduciary duty to a minority shareholder simply by virtue of the shareholding.
The third is the one that matters most, and it is contractual. Shareholders agreements, buy-sell provisions, put rights, tag-along rights, information rights, supermajority thresholds, deadlock mechanics. After Ritchie, a Texas minority owner's real protection is whatever was negotiated at the front end. Drafting is the remedy.