When a company's board votes to sell the business or approve a major transaction, they face an immediate problem: their fiduciary duty to shareholders requires them to determine whether the price is financially reasonable. But boards are not financial analysts. The fairness opinion is the mechanism they use — and understanding what it does and does not guarantee is essential for anyone working in or around M&A.
Why boards commission fairness opinions
The legal and governance rationale is clear: a board that approves a sale for inadequate consideration can be sued for breach of fiduciary duty. A fairness opinion provides documented evidence that the board engaged a qualified third party, heard a professional valuation analysis, and made an informed decision. It shifts the standard of review from "did the board get the right price?" to "did the board follow a reasonable process?"
In the United States, the landmark Delaware case Smith v. Van Gorkom (1985) — in which board members were held personally liable for approving a sale without adequate financial analysis — accelerated the standardisation of fairness opinions in public M&A. Today they are obtained in virtually every material public company transaction in the US and UK.
The process: what goes into a fairness opinion
The adviser conducts a full valuation using multiple methodologies: a discounted cash flow analysis (based on management projections), a public trading comparables analysis (how similar listed companies are valued by the market), a precedent transactions analysis (what acquirers paid in comparable historical deals), and sometimes an LBO analysis (what a financial sponsor could afford to pay and still generate acceptable returns). Each methodology produces a valuation range, and all are presented together as a "football field" chart to the board — a horizontal bar chart showing each methodology's range and where the deal price sits relative to them.
The exact wording matters
The phrase "fair from a financial point of view" is intentional and carefully scoped. It means the consideration falls within a range the adviser considers financially defensible — not that the price is the highest achievable, not that the process was optimal, and not that shareholders will be better off after the transaction than before.
A deal at £8 per share can receive a positive fairness opinion even if management privately believes £10 per share might have been achievable with more time or a different process. The opinion evaluates the price against what the business is worth, not against what might theoretically have been extracted in different circumstances.
The conflict of interest problem
The adviser rendering the fairness opinion is typically paid a fee contingent on deal completion — meaning they receive full compensation only if the transaction closes. This creates an obvious structural incentive to render a positive opinion. Academic research has consistently found that negative fairness opinions — opinions concluding the price is not fair — are extraordinarily rare, occurring in fewer than 2% of deals where an opinion was rendered.
To partially address this, many boards now engage a separate independent financial adviser with a flat (non-contingent) fee to provide a second opinion, particularly for related-party transactions where the conflict of interest is most acute. This practice is now required in certain circumstances under the UK City Code on Takeovers and Mergers.