What Does a Fairness Opinion Actually Do?

Fairness opinions are one of the most misunderstood instruments in M&A transactions. Most people who encounter them know that they are required in certain situations and produced by investment bankers. Fewer understand what they actually say, what they don't say, and why they exist.

What it is

A fairness opinion is a written letter from an investment bank or financial advisor stating that, in their opinion, the consideration to be received in a transaction is fair, from a financial point of view, to the shareholders of the company being acquired.

It is not a valuation. It does not say what the company is worth. It says that the price being paid falls within a range that a financial advisor, having conducted specified analyses, considers to be fair. These are meaningfully different claims.

Who gets one and why

Fairness opinions are most commonly required in public company M&A transactions — the board of directors has a fiduciary duty to shareholders and uses the opinion as evidence that they fulfilled that duty in approving the transaction. In private company transactions, they are less universal but still common in specific situations.

Minority shareholders in a private company who are being cashed out in a transaction controlled by a majority shareholder often request or require a fairness opinion. Transactions involving conflicts of interest — a management buyout, for example, where the people approving the deal are also the people buying the company — typically require one.

Boards of private companies with fiduciary obligations to a class of shareholders (preferred shareholders in a VC-backed company, for example) frequently obtain them.

A fairness opinion says that the price falls within a range considered fair. It does not say what the company is worth.

What it actually contains

A fairness opinion letter is supported by an analysis that typically includes: a review of the proposed transaction terms, financial analysis of the company (comparable public company analysis, comparable transaction analysis, discounted cash flow analysis), a review of relevant financial information, and a description of the process by which the analysis was conducted.

The opinion itself is usually two or three paragraphs stating the conclusion — that the consideration is fair from a financial point of view — subject to various assumptions, limitations, and qualifications. Those qualifications matter. The opinion is limited to the financial fairness of the price; it says nothing about the strategic merits of the transaction, whether a better price could have been obtained elsewhere, or whether the transaction is otherwise advisable.

The legal protection question

One of the primary functions of a fairness opinion in practice is to provide legal protection to the board. Directors who approve a transaction accompanied by a fairness opinion from a reputable advisor are in a substantially better position in the event of shareholder litigation than directors who approved the same transaction without one. The opinion is evidence of process — that the board took their fiduciary duty seriously and sought qualified independent financial advice.

This protective function is real and consequential. The business judgment rule — the legal doctrine that protects boards from liability for decisions made in good faith with reasonable information — is much easier to invoke when there is an independent financial opinion in the record.

When a private company needs one

The trigger conditions for private company fairness opinions are less standardized than in public company transactions, but the general principle holds: when there is a potential conflict of interest, a minority shareholder class with distinct interests, or a transaction structure where some shareholders are being treated differently from others, a fairness opinion reduces legal exposure and often accelerates the transaction by giving skeptical parties an independent basis for approval.

The cost of a fairness opinion varies with the complexity of the transaction and the advisor involved. For lower middle market transactions, fees are typically in the range of $50,000 to $150,000. In the context of the transaction value and the legal protection provided, this is rarely a meaningful economic consideration.

A fairness opinion is a process instrument as much as it is a financial one. It documents that an independent financial advisor, having reviewed the relevant information and conducted appropriate analysis, concluded that the transaction consideration is fair. That conclusion, and the process behind it, is what the board and their lawyers often need most.