A synergy figure on a sheet has no owner until you explicitly arrange one. In a single acquisition this is often manageable: there is one target, one integration team, and the lines are short. In a buy-and-build with multiple platforms and add-ons, this becomes more complicated. A procurement synergy can touch three or four entities at once, and none of those entities automatically feels responsible for the whole.
The pattern is familiar. A synergy is conceived during due diligence by the deal team or an advisor. That group disappears after closing. What remains is a figure in a model, without anyone steering its realization on a daily basis. The operational teams of the platforms did not substantiate the figure themselves and feel no responsibility for it either. By the time someone asks where the synergy has gone, there is no one who can give a good answer, and no one who feels uncomfortable about it.
That problem grows larger the more platforms a buy-and-build counts. One acquisition needs one owner. Five acquisitions with interwoven synergies — shared procurement, shared back office, cross-selling between platforms — need a structure that determines who is accountable for what, and that structure does not arise automatically from the deal structure itself.
Assigning a synergy is more than putting a name in a cell. It means that someone knows the assumption on which the figure rests — which assumption underlies your synergy figure in a buy-and-build is not a question for afterward, but something the owner must be able to answer from day one. Without making that assumption explicit, the owner does not know when the figure comes under pressure, nor when it in fact remains achievable despite setbacks elsewhere.
Ownership also means that someone periodically checks whether the synergy still holds. Market conditions, staff turnover, and changing customer contracts can undermine an assumption that seemed solid at the time of the deal. How you check this depends on the type of synergy and the phase of the integration — how do you check whether a synergy is still achievable in a buy-and-build describes what that check should focus on.
A synergy never stands on its own. It is derived from a broader assumption about why platforms together are worth more than apart. When that underlying thesis shifts — because a market moves differently than expected, or because a platform develops differently — the ground under the synergy shifts too, even though no one notices it immediately. What that mechanism precisely is, and why it easily disappears from view, is described in what is a deal thesis and why does it disappear. For the owner of a synergy, this is relevant: they check not only the figure, but also the assumption on which the thesis of the entire buy-and-build rests.
An owner needs a way to show where a synergy stands, without that method itself making a statement about whether the figure will be achieved. A traffic light system — green, amber, red, linked to the status of the underlying assumption and the progress of the action — gives an operating partner and a supervisory board a shared picture without making a promise no one can keep. How you set this up is described in how do you track synergies with traffic lights in a buy-and-build.
A synergy that shows red is not a failure of the owner. It is information. The question that follows — what you do with a synergy that does not land — should be asked as a standard practice, not as an exception when things go wrong. That topic, including the question of whether writing off, reformulating, or leaving it as is the right route, is covered in what do you do with a synergy that does not land in a buy-and-build.
An owner can only steer a synergy that is well substantiated. A figure that arose from a rough estimate during due diligence, without a clear method of calculation, cannot be defended and cannot be checked. How you substantiate a synergy in a way that makes it transferable to an owner who was not involved in the deal itself is described in how do you substantiate a synergy.
The three generators of mergerintegration.net — synergy baseline, Day 1 plan, Day 100 plan — and the integration office are set up to make this assignment structural: benefit tracking per synergy, dependencies between platforms, and a decision log that records what is and is not integrated. That tooling is under construction; anyone who wants to make use of it already can join the waiting list.
Ownership of a synergy ultimately relates to the question of who does the underlying work: the measuring, the reporting, the adjusting of the assumption. Part of that work is repeatable and easy to structure. The work scan of FTE TO AI calculates per task which part of the work can be taken over by AI, which is relevant for an integration office that must keep track of multiple synergies, platforms, and reporting cycles at once with limited capacity.
Vraag maar wat er op Day 1 moet staan, of wat integreren juist kapotmaakt.
Answers come from this site’s knowledge base. Not tailored advice, and not a scan of your company.