A breach of fiduciary duty happens when someone in a position of trust — such as a business partner, corporate officer or director, agent, trustee, or attorney — fails to act in the other party's best interest and instead puts their own interests first. A fiduciary duty is the high legal duty of loyalty and care the law imposes on people who hold discretionary power over someone else's money, business, or affairs.
In Missouri, breach of fiduciary duty is largely a common-law claim. It arises most often in business, partnership, and trust disputes, and its remedies can reach further than an ordinary contract claim.
How breach of fiduciary duty works in Missouri
A fiduciary owes two core obligations: a duty of loyalty (act for the other party's benefit, not for secret personal gain) and a duty of care (act with the diligence a reasonably careful person would use). The duty can flow from a person's role — a partner, an officer or director, an LLC manager, a controlling shareholder, an agent, or a trustee.
A breach occurs when the fiduciary self-deals, takes a business opportunity that belonged to the company, competes with the entity, misuses funds or confidential information, or otherwise betrays that trust and causes harm. Missouri's elements are generally: (1) a fiduciary duty existed, (2) the defendant breached it, (3) the breach caused (4) damages. Remedies can include compensatory damages, disgorgement of the wrongdoer's profits, an accounting, a constructive trust, an injunction, or removal of the fiduciary.
Why it matters
Breach of fiduciary duty is one of the most powerful tools in a business or partnership dispute. Because the duty is rooted in equity, a court can make a disloyal fiduciary surrender the profits they earned — not just the loss the victim suffered — and can impose a constructive trust on property acquired through the breach.
This matters most in close corporations, small partnerships, and LLCs, where a minority owner cannot simply sell out and walk away. The claim often travels alongside shareholder oppression claims when those in control freeze out a minority owner from distributions, information, or a role. Identifying a fiduciary breach early can change both the theory and the size of the recovery.
Frequently Asked Questions
Who owes a fiduciary duty in Missouri?
People who hold discretionary power over another's interests — including business partners, corporate officers and directors, LLC members and managers, controlling shareholders in a close corporation, agents, and trustees. The key is the trust the relationship places in that person, not the title alone.
What must I prove for a breach of fiduciary duty?
Generally four things: that a fiduciary duty existed, that the defendant breached it, that the breach caused harm, and that you suffered damages or the fiduciary gained a wrongful profit. The facts and the type of duty depend heavily on the role and relationship involved.
What can I recover for a breach of fiduciary duty?
A court may award compensatory damages, order disgorgement of profits the wrongdoer earned, require an accounting, impose a constructive trust on property gained through the breach, issue an injunction, or remove the fiduciary. These equitable remedies are what set the claim apart from an ordinary contract dispute.
Legal Disclaimer
This page provides general legal information about Missouri law and is not legal advice. It does not create an attorney-client relationship. Every situation depends on its own facts, deadlines, and documents; consult a qualified Missouri attorney before acting.