How to destroy M&A value?

Most mergers and acquisitions are, on paper, entirely rational. The numbers stack up, the synergies are carefully modelled, and the Board signs off with confidence that value will be created. Yet a significant proportion fail to deliver what was promised.

In my experience, the issue is rarely the deal itself. It is what happens next.

When two businesses come together, or when one is separated, three factors determine whether value is realised. The strategy must be clear, the organisation must be structured to deliver it, and the leadership team must have the capability required for what comes next, not what came before.

The first two are usually handled with discipline. Strategy is debated and refined, structures are designed and implemented. The third is where things begin to unravel. There is often an unspoken assumption that strong individuals will naturally form a strong leadership team. That assumption does not hold in a new context.

Because the context changes immediately. Roles shift, decision rights move, expectations increase, and the pace of execution intensifies. What made someone successful in the previous organisation may only partially translate into the new one. Without a clear assessment of capability against future demands, execution risk increases significantly.

I have seen organisations where integration plans were well constructed and delivered on schedule, yet performance stalled. Not because the strategy was wrong, but because the leadership team was not aligned on how to execute it. Decision making slowed, accountability became blurred, and informal power structures began to compete with formal ones.

The intervention that made the difference was not financial or operational. It was leadership alignment and a clear view of capability against the future strategy. Once roles were clarified, decision rights made explicit, and expectations reset, execution accelerated. The numbers began to follow.

This is the reality of value creation in M&A. It does not come from the deal model, it comes from the quality of decisions made in the months and years that follow. That, in turn, depends on whether the leadership team is equipped for the demands of the new business.

Boards approve the deal, but leadership teams determine whether it succeeds. They are not the same thing.

Get the leadership right, and value tends to emerge. Get it wrong, and even the best deal will struggle to deliver what it promised.