What Duties Do Majority Owners Legally Owe to Minority Owners?

Why Fiduciary Duties Exist in This Context

In a closely held company, majority owners typically control the board, management, and day-to-day decision-making, while minority owners have limited practical power to influence outcomes. Without some legal check on that control, majority owners would have almost unlimited ability to structure the company’s affairs purely for their own benefit.

Arizona courts have recognized that this imbalance requires a legal safeguard, and have held that majority shareholders and controlling parties in closely held corporations owe fiduciary duties to minority shareholders, similar in spirit to duties owed by corporate officers and directors to the company itself.

The Duty of Loyalty

The duty of loyalty generally requires majority owners to act in the best interest of the company and its shareholders as a whole, rather than using their position to benefit themselves personally at the minority’s expense. This duty is at the core of most fiduciary duty claims between shareholders.

A breach of loyalty often shows up as self-dealing: structuring transactions to personally benefit the majority owner, diverting business opportunities that should belong to the company, or using company assets or resources for personal purposes without proper authorization or compensation to the company.

The Duty of Good Faith and Fair Dealing

Majority owners are generally expected to deal fairly and honestly with minority owners, not to use technical compliance with formal procedures as cover for conduct that is substantively unfair. This duty focuses on the real fairness of how decisions affecting minority owners are actually made and carried out.

This is part of why following the letter of a governing agreement does not automatically insulate majority owners from liability, if the underlying purpose or effect of a technically permitted action was to unfairly disadvantage a minority owner, a good faith and fair dealing claim can still apply.

The Duty of Care

Those in control of a company also generally owe a duty of care, requiring them to make decisions with reasonable diligence and prudence, rather than recklessly or negligently in a way that damages the company and, by extension, minority owners’ interests.

This duty is somewhat less commonly the basis of a standalone shareholder dispute compared to loyalty and good faith violations, but it can become relevant when majority owners’ mismanagement, not just self-dealing, has caused real harm to the company’s value.

Common Fact Patterns That Show Up in These Claims

• Excessive compensation or perks for majority owners, disproportionate to their actual role or the company’s performance.
• Related-party transactions, the company doing business with an entity owned or controlled by a majority owner, on non-arm’s-length terms.
• Diverted business opportunities, the majority owner taking a deal that should have belonged to the company.
• Selective disclosure, sharing information with some owners but not others.

How This Relates to a Statutory Oppression Claim

A fiduciary duty claim and a statutory oppression claim under A.R.S. § 10-1430 often overlap, and are frequently brought together in the same case, but they are legally distinct theories with different requirements and potentially different remedies.

An attorney evaluating a minority shareholder dispute will typically consider both avenues, since the strongest cases often combine evidence supporting each theory, giving the court multiple independent paths to grant relief.

What You Need to Prove a Breach

Generally, you need to establish that a fiduciary duty was owed, that it was breached through specific identified conduct, and that the breach caused actual, quantifiable harm to you as a minority owner. Vague dissatisfaction with how the company is run is not enough, specific, documented conduct is what supports a real claim.

This is why building a clear factual record, financial documents, communications, comparisons between what happened and what proper governance should have looked like, matters so much in developing a viable fiduciary duty case.

Steps to Take if You Suspect a Breach

1. Gather financial records and communications related to the suspected conduct.
2. Identify the specific transactions or decisions that appear improper, not just a general sense something is wrong.
3. Request formal access to relevant records under your statutory inspection rights if you do not already have them.
4. Consult an attorney to evaluate whether your facts support a fiduciary duty claim, an oppression claim, or both.