The irrational exit. Six cognitive biases in selling a company.

8x rejected. 5x signed. Two years later.

The most important decision, with the worst cognitive ergonomics.

A founder makes thousands of decisions over the life of their company. They hire, invest, negotiate with banks, with clients, with suppliers. Every decision trains their judgement. By the time the moment to sell arrives, the founder should be at their decision-making peak.

Exactly the opposite happens. Selling a company is the only financial decision a founder makes for the first time, under maximum emotional pressure, with an irreversible time horizon and with personal identity at stake. There is no prior training. There is no second attempt. And experience accumulated in other decisions often hurts: it breeds false confidence in one's ability to “read” the situation.

Economic psychology has spent half a century documenting these mechanisms. This article applies that framework to the company sale process:six cognitive biases mapped onto the six phases of a sell-side process.

Kahneman, Thaler and the founder who is not a stock.

In 1979, Kahneman and Tversky showed that people evaluate gains and losses asymmetrically: a €100 loss produces psychological pain 2.25 times greater than the pleasure of an equivalent gain. The direct consequence is that people prefer to avoid losses rather than capture gains, even when the maths advises otherwise.

Thaler formalised the endowment effect: people demand significantly more to part with something they already own than they would be willing to pay to acquire it. In a sell-side context, the asset at stake is not a portfolio of fungible shares. It is the company the founder built with their own hands. Three factors amplify every bias:

Fused identity.The founder does not “have” a company. The founder “is” their company, at least in part. Selling produces an identity threat that exists in no standard financial decision.

Unique experience.An investor can learn from hundreds of transactions. A founder sells a company once in a lifetime, perhaps twice. No learning curve is possible.

Total irreversibility.A badly sold stock can be bought back. A sold company does not come back. The perception of irreversibility magnifies loss aversion to levels that classical prospect theory does not capture.

Six biases. Six phases. One process.

Each bias peaks at a specific moment in the sell-side process. The framework maps the cognitive distortion onto the phase of the deal where it does the most operational damage.

Status quo bias is the systematic preference for the current state of things. Combined with the endowment effect, it produces a predictable result: the founder overvalues what they already have (recurring income, control) and undervalues what they could obtain (liquidity, wealth diversification, freed-up time).

The operational manifestation is recurring postponement dressed up as rationality. The founder does not say “I don't want to sell”. They say “now is not the time”. And there is always a new reason. The problem is not each individual reason but the pattern: the decision not to sell is taken by default, without formally assessing the opportunity cost of waiting.

Repeated exploratory conversations with several advisors over years without a signed mandate. Resistance to producing standardised financial information. Family members of the founder voicing opinions on the sale without operational involvement.

Scenario valuation: sell today, in 3 years, in 5 years, with explicit assumptions. The goal is not to force the decision but to make the opportunity cost of waiting visible.

Anchoring is one of the most robust biases in experimental psychology. In selling a company, the anchor is not random: it is a historical offer, an informal conversation with another business owner, or a valuation inherited from the previous founder. The most frequent pattern: a strategic buyer mentioned a multiple three to seven years ago, under completely different market conditions. That figure becomes the psychological floor of any subsequent negotiation.

In the first conversation, the founder quotes a figure before the advisor asks about expectations. Resistance to multiples as a metric. Spontaneous comparisons with sector deals without adjusting for size or timing.

Value triangulation: three parallel methodologies (comparable transaction multiples, listed peer multiples with a liquidity discount, discounted cash flows with sensitivities). The resulting range replaces the historical anchor as the new reference.

Cain, Moore and Haran distinguish three dimensions of overconfidence: overestimation (believing the outcome will be better than it will be), overplacement (believing one is better than others) and overprecision (excessive certainty about a specific number). All three operate when the founder builds the business plan that will accompany the sale teaser.

The classic manifestation is the hockey stick: flat or declining EBITDA in the recent track record followed by 20%–40% annual acceleration in the forward years, supported by “clear levers” that were never executed before. The sophisticated buyer applies a significant discount. The founder perceives this as distrust, not as rational calibration.

A single-sheet business plan, with no sensitivities or scenarios. Commercial pipeline valued at 100% probability. The founder is cognitively unable to present a credible adverse scenario.

Co-building the business plan in session: the advisor questions and the founder defends each lever. The result is a natural 15%–30% trim of forward growth. Mandatory triple scenario in the teaser (base, upside, downside) with explicit assumptions.

The 2.25 ratio produces a concrete, measurable effect: the founder does not evaluate each offer in absolute terms but as distance from a mental reference point. If the expectation was 8 times EBITDA, an offer at 7 times is not perceived as “receiving 7 times a recurring EBITDA”. It is perceived as “losing 1 time”.

Aversion to that perceived loss blocks deals that would be rational under any objective analysis. The founder focuses obsessively on the component that falls below expectation and ignores components that could offset it: a well-structured earn-out, rollover equity, reduced warranties.

“I need another offer to validate” when two comparable offers are already on the table. Assessment focused exclusively on headline price. Inability to articulate the opportunity cost of not selling.

Explicit re-anchoring: compare each offer with no-sale scenarios (three more years operating, sector risks, succession profile), not with the historical anchor. Break the offer down into components and discuss each one separately.

After six to nine months of process, the founder has invested a volume of time, emotional energy and operational disruption that they perceive as unrecoverable. When Due Diligence uncovers a material issue and the buyer proposes a price adjustment, the founder accepts terms they would have rejected on day one. The reason they voice is revealing: “we've already invested too much to walk away”.

A systematic “we'll sort it out” response to each new friction, instead of “this is the threshold that justifies reopening the process”. Resistance to the advisor even mentioning the possibility of a break.

A walk-away threshold defined in writing before entering exclusivity: minimum price, minimum acceptable structure, maximum conditions. Prepare a process reopening in parallel: an updated list of alternative candidates and materials ready to go.

The narrative fallacy, defined by Nassim Taleb, is the tendency to build coherent stories that explain the past and to believe those stories predict the future. At closing, the founder deploys a narrative of uniqueness that underweights objective market benchmarks.

The manifestation is not in the price (already agreed by this stage) but in the non-monetary clauses of the SPA. Standard representations and warranties are perceived as “not applicable to my case”. Non-compete clauses, post-deal retention and brand use are negotiated with an intensity disproportionate to their economic value. The underlying mechanism is the identity threat: signing a five-year non-compete is not a financial decision for the founder. It is a decision about who they are.

The founder returns an SPA markup striking out standard clauses. Lengthy discussions over clauses of low relative economic value. Late appearance of objections that were never raised in the letter of intent.

Pre-negotiating the “identity clauses” before the SPA: treat them as a concept in the letter of intent, not as fine print. Show benchmarks from comparable transactions to neutralise the perception of uniqueness.

Six mitigants. One per phase.

Cognitive biases are not eliminated by willpower. They are neutralised by structure. Each mitigant is a process tool a founder can activate before the bias causes irreversible damage.