Resources / Glossary / Fiduciary duty

Fiduciary duty.

Aka. Duty of loyalty · Duty of care
All terms

What is fiduciary duty?

A fiduciary duty is the legal obligation of someone entrusted with another party's interests to act for that party's benefit rather than their own. In a company, directors and officers owe fiduciary duties to the corporation and, ultimately, to its shareholders. It is the standard against which board conduct in a transaction is judged.

The duty is conventionally split into two strands. The duty of care requires directors to be informed and to deliberate with reasonable diligence before deciding. The duty of loyalty requires them to put the company's interests ahead of their own and to avoid conflicts and self-dealing. A third strand, the duty of good faith, is often treated as part of loyalty.

In M&A, fiduciary duty is not abstract — it dictates how a board runs a sale process, how it handles conflicts, and what protections (special committees, fairness opinions, market checks) it must put in place to withstand later challenge by shareholders.

How fiduciary duty shapes a deal

A board's fiduciary obligations drive the procedural choreography of a transaction. The recurring moves are:

  1. Run an informed process. To satisfy the duty of care, the board must gather adequate information — financials, advice from bankers and counsel, and often a fairness opinion — before approving a deal.
  2. Manage conflicts. Where a director or controlling shareholder has an interest on both sides, the board insulates the decision, typically by forming a special committee of independent directors to negotiate.
  3. Test the market. Depending on the situation, the board may need to canvass alternatives or conduct a go-shop or market check to show it sought the best reasonably available outcome.
  4. Document the record. Minutes, advisor presentations, and committee deliberations build the evidentiary record that the board acted carefully and loyally.

Doing this well shifts a court's review toward the deferential business judgment rule; doing it poorly invites the far more demanding entire fairness standard.

Business judgment rule versus entire fairness

Courts do not second-guess every board decision. Under the business judgment rule, a court presumes that an informed, disinterested, good-faith decision was made in the company's best interests, and will not disturb it. This is the standard most well-run boards aim to earn.

When the board is conflicted — for example, a controlling shareholder on both sides of a deal — the presumption flips and courts may apply entire fairness, requiring the defendants to prove both a fair process and a fair price. Procedural protections like an independent special committee and an informed minority vote can shift the analysis back toward business judgment, which is precisely why those protections are built into conflicted deals.

Frequently asked.

5 questions
01 What are the main fiduciary duties of a director?

The two core duties are the duty of care — being adequately informed and deliberate before deciding — and the duty of loyalty — putting the company's interests ahead of personal ones and avoiding self-dealing. A duty of good faith is generally treated as part of loyalty.

Together they require directors to act on an informed basis, in good faith, and in the honest belief that an action serves the company and its shareholders.

02 What is the business judgment rule?

It is a legal presumption that a board's decision was made by informed, disinterested directors acting in good faith. When it applies, courts defer to the board and will not substitute their own judgment, even if the decision turns out badly. The rule protects directors who follow a sound process, which is why process discipline matters so much in deal-making.

03 When does entire fairness apply instead of business judgment?

Entire fairness typically applies when the board or a controlling shareholder is conflicted — such as a controller on both sides of a transaction. The defendants must then prove both fair dealing (the process) and fair price (the terms). Independent special committees and informed minority shareholder votes can move the standard back toward business judgment review.

04 Do fiduciary duties run to shareholders or to the company?

Directors owe their duties to the corporation and its shareholders collectively. In most circumstances that means maximizing long-term shareholder value, but the duty is to the enterprise as a whole rather than to any single shareholder. In a sale-of-control scenario, the focus often sharpens to obtaining the best value reasonably available for shareholders.

05 How does a board build a record that it met its fiduciary duties?

By documenting the process: board and committee minutes, advisor materials, fairness opinions, and a clear timeline of deliberations. This record is what a court reviews if the deal is later challenged. Keeping that deliberation record organized and queryable — rather than scattered across email and drives — is what lets a board demonstrate, years later, that it acted with care and loyalty.

Related terms

Plegal governance

Pay-to-play

A financing term that penalizes investors who <em>don't participate</em> pro rata in a new round, typically by converting their preferred into common.

Open
Tlegal governance

Tag-along rights

A minority protection letting smaller holders <em>join a sale</em> a majority shareholder has negotiated, selling on the same terms rather than being left behind.

Open
Mlegal governance

Most favored nation

A clause guaranteeing one party terms <em>no worse</em> than any other counterparty gets — if someone later negotiates a better deal, the MFN holder gets it too.

Open
Ilegal governance

Information rights

An investor's contractual right to receive the company's <em>financials and key data</em> on a set schedule — and often to inspect its books and records.

Open
Ilegal governance

Indemnification cap

The ceiling on how much a seller can be required to pay a buyer for breaches of the deal's representations — the maximum dollar exposure after close.

Open
Blegal governance

Board control

Holding enough seats to command a majority of board votes — the power to <em>decide</em> the matters that the board, not shareholders, controls.

Open
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