Ethics and Conflicts of Interest in Valuation

Introduction

Valuation analysis in investment banking is never produced in a disinterested vacuum. The banker advising on a sell-side M&A process earns a fee contingent on the deal closing. The banker providing a fairness opinion on the same deal typically works for the same institution. The analyst building the model knows that the MD wants the output to support the deal narrative. These dynamics create real conflicts of interest that the profession must acknowledge and manage.

This is not an abstract academic concern. Courts, regulators, and shareholders actively scrutinize valuation work for bias, and the consequences of producing dishonest analysis (litigation, regulatory action, reputational damage) are concrete and severe.

Fee Structure Conflicts

The most fundamental conflict in investment banking is the success fee: the advisory fee is paid only if the deal closes. A bank advising on a $5 billion sell-side M&A transaction might earn $15-20 million in advisory fees upon completion but only $1-2 million in a retainer if the deal fails. This creates an economic incentive for the analysis to support deal completion, not to objectively assess whether the deal is in the client's best interest.

The same dynamic applies to fairness opinions. The fairness opinion fee (typically $1-3 million) is dwarfed by the advisory fee (which may be 5-10x larger and is contingent on closing). If the fairness opinion concludes the deal is NOT fair, the deal may collapse, and the bank loses the much larger advisory fee. This structural incentive makes it rare for a bank to issue a negative fairness opinion on a deal it is also advising on.

Success Fee (Contingent Fee)

An advisory fee that is paid only if the transaction closes. In investment banking, the bulk of advisory compensation is structured as a success fee, typically calculated as a percentage of the deal value (0.3-1.0% for large transactions, higher for smaller deals). The success fee creates an inherent conflict: the banker has a financial incentive to ensure the deal closes, which may influence the valuation analysis to support deal completion rather than challenge it. This conflict is structural (it affects every deal at every bank) and is managed through institutional safeguards rather than eliminated entirely.

Peer Group and Assumption Selection Bias

Research has documented that investment banks systematically select peer groups with higher valuation multiples when advising sell-side clients, effectively inflating the implied valuation. On the buy side, the reverse occurs: banks may select lower-multiple peers to argue the target is overvalued. While some degree of advocacy is inherent in advisory work, egregious bias in peer selection can undermine credibility and create legal exposure.

Similarly, DCF assumptions (growth rates, margins, WACC, terminal value) offer significant latitude for judgment. Two defensible sets of assumptions can produce valuations that differ by 30% or more. The analyst's choice of where within the defensible range to anchor the base case can be influenced (consciously or unconsciously) by the institutional desire for the deal to proceed.

Relationship Pressures

Beyond deal-specific fees, bankers face relationship pressures: the MD wants to maintain the client relationship for future mandates, which creates an incentive to tell the client what they want to hear rather than what the analysis objectively supports. A sell-side banker who tells the CEO "your company is worth less than you think" risks losing the mandate to a competitor who will present a more optimistic view.

The most important safeguard against valuation bias is the bank's fairness opinion committee, which operates independently from the deal team. The committee reviews the valuation analysis, challenges assumptions, and decides whether the bank can issue the opinion. The deal team (which has a financial incentive for the opinion to be positive) does not control the committee's decision.

In practice, the committee rarely refuses to issue an opinion (the deal team typically adjusts the analysis to address the committee's concerns before the formal vote). But the committee's existence forces the deal team to produce analysis that can withstand independent scrutiny, which raises the quality and objectivity of the work even if the ultimate opinion is positive.

Some companies address the conflict more directly by engaging a separate, independent bank solely to provide the fairness opinion, with a flat fee that is not contingent on deal completion. This structure eliminates the fee conflict entirely but adds cost and complexity.

Document every assumption and its source. A WACC input documented as "Beta: 1.15, Bloomberg adjusted beta, 2-year weekly, as of 03/18/2026" is defensible. "Beta: 1.15" with no source is not. Documentation is the analyst's first line of defense.

Present ranges, not point estimates. Presenting a single-point valuation implies certainty that does not exist and makes it easier for bias to go undetected. A sensitivity table showing the output across a grid of assumptions makes the judgment calls transparent and allows the reader (or the court) to evaluate whether the base case sits in a reasonable position within the range.

Separate the opinion from the advocacy. The fairness opinion committee is independent from the deal team precisely to provide a check on the deal team's natural advocacy. The committee can (and occasionally does) refuse to issue an opinion if the analysis does not support a fairness conclusion.

Include contradictory evidence. A valuation presentation that addresses counterarguments ("the DCF suggests a lower value than precedent transactions because of X, and here is why we weight precedent transactions more heavily in this context") is more credible than one that presents only the favorable data points.