What Is a Fairness Opinion?
A fairness opinion is a written assessment, typically prepared by an investment bank, that concludes whether the consideration in a proposed transaction is fair from a financial point of view to a specific group, usually the selling company's shareholders. It is delivered to the board of directors before they vote to approve a deal.
The opinion itself is usually a short letter, but it is backed by a detailed valuation analysis presented to the board. Importantly, it does not say the price is the best achievable or recommend how shareholders should vote; it only addresses whether the price falls within a financially reasonable range.
How Banks Build the Analysis
The supporting work looks like a condensed valuation textbook: a discounted cash flow analysis, comparable company analysis, precedent transaction analysis, and often premiums paid analysis and a review of analyst price targets. Each method produces a valuation range, and the bank checks whether the offer price sits within or above those ranges.
For example, if a buyer offers 45 dollars per share and the bank's DCF implies 38 to 48 dollars, comparables imply 35 to 44 dollars, and precedent transactions imply 40 to 50 dollars, the bank can credibly opine that 45 dollars is fair. Building these football field valuation summaries for fairness opinions is classic analyst work, and interviewers often ask candidates to explain which methodologies typically produce the highest and lowest values.
Why Boards Want One
Directors owe fiduciary duties to shareholders, and approving a sale of the company is one of the highest-stakes decisions a board makes. A fairness opinion from a reputable bank provides evidence that the board acted with care and on an informed basis, which matters enormously if shareholders later sue over the deal price.
Fairness opinions are especially important in conflicted situations, such as management buyouts or deals with a controlling shareholder, where an independent committee of the board often hires its own bank specifically to render one.
Criticisms and Limitations
A common criticism is that the bank writing the opinion is often the same bank advising on the deal, with a large success fee contingent on closing, which creates an obvious incentive to bless the price. Some boards address this by paying a separate, non-contingent fee for the opinion or by hiring an independent firm.
Valuation ranges are also flexible enough that a motivated analysis can justify a wide spread of prices. That is why courts and sophisticated boards focus on the quality of the underlying assumptions, not just the existence of the opinion letter.
