California Corporations Code Section 16404 sets out the specific duties every partner owes. Understanding what the statute actually requires makes it easier to recognize a real breach, separate it from an ordinary business dispute, and decide whether legal action is warranted.

The Fiduciary Duties Partners Owe Under California Law

California Corporations Code Section 16404 identifies two core fiduciary duties that partners owe to the partnership and to each other: the duty of loyalty and the duty of care. The statute also imposes a separate obligation of good faith and fair dealing. A breach of any of these can give rise to a claim.

The Duty of Loyalty

The duty of loyalty is the strictest obligation a partner carries. Under Section 16404(b), a partner must do three things.

1. First, account to the partnership for any property, profit, or benefit gained from partnership business, from use of partnership property, or from taking a business opportunity that belonged to the partnership.
2. Second, refrain from dealing with the partnership as, or on behalf of, a party whose interests are adverse to the partnership.
3. Third, refrain from competing with the partnership before it dissolves.

Common breaches of the duty of loyalty include:

• Diverting a client, contract, or opportunity that came to the partnership and taking it for a side business.
• Self-dealing, such as steering partnership money into a company the partner secretly owns.
• Using partnership funds, equipment, or confidential information for personal projects.
• Secretly competing against the partnership while still a partner.
• Taking undisclosed commissions, kickbacks, or rebates connected to partnership business.

The Duty of Care

The duty of care sets a floor for how carefully a partner must manage the business. Section 16404(c) limits this duty to refraining from grossly negligent or reckless conduct, intentional misconduct, or a knowing violation of law. This is an important distinction. An ordinary mistake or a business decision that simply turns out badly does not breach the duty of care. The conduct has to rise to the level of gross negligence or worse.

Examples that can support a breach of the duty of care include:

• Overspending the partnership budget while ignoring obvious and foreseeable financial risk.
• Signing major contracts without any effort to investigate whether the other side could perform.
• Failing to keep basic financial records, leading to serious and avoidable losses.
• Knowingly violating a law or regulation that exposes the partnership to liability.

The Obligation of Good Faith and Fair Dealing

Section 16404(d) requires each partner to discharge their duties and exercise their rights consistently with the obligation of good faith and fair dealing. This obligation runs through every partnership decision. A partner who technically follows the partnership agreement but manipulates the process to squeeze out another partner, hide information, or gain an unfair edge may still be acting in bad faith.

What Does Not Count as a Breach

Not every conflict between partners is a breach of fiduciary duty. California law makes several points clear. A partner does not violate a duty simply because their conduct also serves their own interest, as stated in Section 16404(e). Pursuing profit is expected. The problem arises only when a partner advances personal interests at the expense of the partnership through disloyalty, gross carelessness, or bad faith.

Likewise, honest disagreements about strategy, ordinary business losses, and reasonable decisions that later prove wrong do not create liability. Competing with the business after the partnership has dissolved is generally permitted, because the duty not to compete applies before dissolution.

How a Breach of Fiduciary Duty Is Proven

To succeed on a breach of fiduciary duty claim in California, the aggrieved partner generally must establish that a fiduciary duty existed, that the other partner breached it, and that the breach caused measurable harm to the partnership or to the partner. Evidence often comes from financial records, bank statements, emails, contracts, and testimony that shows the diverted money, the hidden transaction, or the taken opportunity. A forensic accounting is frequently used to trace funds and quantify the loss.

Remedies Available to an Aggrieved Partner

California partners have several potential remedies when a breach occurs. A partner can seek monetary damages for the losses caused by the breach. Courts can order disgorgement, which forces the breaching partner to give up profits wrongfully obtained. A formal accounting can be demanded to reveal the true state of the partnership finances. In cases where assets or operations are at risk during the dispute, a partner may petition for injunctive relief to freeze harmful conduct while the case proceeds. In serious cases, the breach can support removal of the partner or dissolution of the partnership.

When to Speak With a Business Litigation Attorney

Fiduciary disputes tend to escalate quickly, and evidence can disappear once a partner realizes they are being watched. If you believe a business partner is diverting money, taking opportunities, or running the business into the ground through reckless conduct, acting early protects both your rights and the value of the business. A California business litigation attorney can review the partnership agreement, evaluate whether the conduct meets the legal standard for a breach, and advise on the fastest path to protect partnership assets.

What Is a Shareholder Derivative Action?

A shareholder derivative action is a lawsuit brought by a shareholder to enforce a right that belongs to the corporation rather than to the shareholder personally. The shareholder acts as a stand-in for the company. Because the claim belongs to the corporation, any recovery goes to the corporation, not to the shareholder who filed the suit.

These actions typically target wrongdoing by directors, officers, or controlling shareholders, such as breaches of fiduciary duty, self-dealing, or waste of corporate assets. The corporation is technically named as a defendant, but only because it is the party that owns the claim and must be bound by the result.

Derivative Action vs. Direct Lawsuit

The central question in this area of law is whose injury is at stake. A direct lawsuit belongs to the shareholder because the harm fell on the shareholder personally. A derivative action belongs to the corporation because the harm fell on the company, and the shareholder only feels it indirectly through a drop in the value of their shares.

Examples of direct claims include:

• Being denied dividends that were properly declared and owed to you.
• Being blocked from inspecting corporate records you have a right to see.
• Having your voting rights improperly diluted or ignored.

Examples of derivative claims include:

• Directors diverting corporate opportunities or funds for personal gain.
• Officers entering self-dealing transactions that drain company value.
• Wasting corporate assets through reckless or bad-faith decisions.

The distinction matters because it controls who can sue, what procedures apply, and who receives any recovery. Courts look at the nature of the injury, not the label the plaintiff puts on the claim.

Who Can Bring a Derivative Action in California

California Corporations Code Section 800 sets the requirements for bringing a derivative suit. A plaintiff generally must satisfy two standing rules. First, the contemporaneous ownership rule requires that the plaintiff was a shareholder at the time of the transaction they are challenging, or that their shares passed to them by operation of law from someone who was. Second, the plaintiff must fairly and adequately represent the interests of the corporation and the other shareholders in enforcing the claim.

These rules exist to prevent people from buying into a company just to sue over past conduct, and to make sure the person carrying the corporation’s claim actually has the company’s best interests in mind.

The Demand Requirement and Demand Futility

Before filing, a shareholder usually must make a demand on the board, formally asking the directors to address the wrongdoing themselves. Under Section 800, the complaint must allege with particularity either the plaintiff’s efforts to get the board to act or the reasons why no demand was made.

A demand can be excused when it would be futile, meaning the board is too conflicted or compromised to fairly evaluate the request. If most of the directors are the same people accused of wrongdoing, for example, asking them to sue themselves serves little purpose. Demand futility is a fact-specific analysis, and how it is pleaded often shapes whether the case survives an early motion to dismiss.

Common Grounds for a Shareholder Derivative Claim

Derivative actions arise from conduct that injures the corporation as a whole. Frequent grounds include breach of the duty of loyalty through self-dealing or diverted opportunities, breach of the duty of care through grossly negligent decisions, fraud, corporate waste, and misuse of company funds or information. What ties these together is a harm to the company that the responsible insiders are unlikely to pursue on their own.

What Happens to Money Recovered

Because the claim belongs to the corporation, a successful derivative action returns the recovery to the corporation rather than to the shareholder who brought it. The shareholder benefits indirectly as the value of the company, and their stake in it, is restored. In many cases the court may also award the prevailing shareholder’s attorney fees from the recovery, recognizing the benefit conferred on the corporation.

The Business Judgment Rule

Directors are given real latitude to make business decisions. The business judgment rule presumes that directors act in good faith, on an informed basis, and in the honest belief that their decisions serve the corporation. To move a derivative claim forward, a shareholder generally must plead facts that overcome this presumption, such as fraud, a conflict of interest, or a decision so uninformed that it cannot be defended as reasonable. This is one reason derivative claims require careful pleading from the start.

Frequently Asked Questions

Can a minority shareholder file a derivative action in California?

Yes. A minority shareholder can bring a derivative action as long as they meet the standing requirements in Corporations Code Section 800, including contemporaneous ownership and fair and adequate representation of the corporation’s interests.

Do I keep the money if I win a derivative lawsuit?

No. Because the claim belongs to the corporation, any recovery goes to the corporation. You benefit indirectly through the restored value of your shares, and the court may award your attorney fees from the recovery.

What is the difference between a derivative and a direct claim?

A direct claim is based on harm to you personally, such as denied dividends or blocked inspection rights. A derivative claim is based on harm to the corporation, and the recovery goes to the company rather than to you.

Do I have to make a demand on the board first?

Usually yes, unless demand would be futile. California requires the complaint to describe your efforts to get the board to act or to explain with particularity why no demand was made.

Rokita Law – Trusted Business Lawyers in Newport Beach and Beverly Hills

Amanda Rokita’s knowledge and experience in business litigation assures that your legal matters will be handled with the utmost care. If you are a shareholder weighing a derivative action, or a director responding to one, a trusted business lawyer in Newport Beach and Beverly Hills can help you understand your rights and protect the value of the company. Schedule a consultation today to see how our team can help you navigate the complex world of business litigation.

Rokita Law, P.C. provides the content on this post for informational purposes only. The information should not be construed as, nor is intended to be, legal advice. Results may vary. This is not a guarantee, warranty, or prediction regarding the outcome of your case. Posts are for educational purposes only and are based on California law only, except for trademarks and copyrights filed with the US Patent and Trademark Office (USPTO).