The period between closing and the end of the first quarter is short, but most of what determines whether a merger delivers its savings is decided in it. Leaders are appointed or not, customers stay or begin to look elsewhere, and employees in both companies form a view about what the new organization will be like. That view is hard to change once it has settled.
Across the integrations we have supported, the ones that went well treated the first hundred days as a period with a small number of clear priorities. The ones that went badly tried to do everything at once, or nothing until the organization design was finished.
Settle leadership before closing
The single most useful thing an acquirer can do is announce the top layers of leadership on day one. Uncertainty about jobs is the main reason good people leave in the first year, and it spreads downward: a director who does not know who their manager will be cannot reassure their own team.
In a recent merger of two chemicals producers, the top three layers, about 140 roles, were selected and announced before closing using the same structured assessment for candidates from both sides. Retention of critical staff a year later was 94 percent. In integrations where appointments drag on for six months, we routinely see retention in the seventies.
Selecting leaders fairly matters as much as selecting them quickly. If the appointments look like a victory for one side, the other side's best people will draw their own conclusions.
Protect the customer from the integration
Customers do not care about the merger, except to the extent that it disrupts them. Competitors know this and will be calling your largest accounts in the first week.
Good practice is to leave customer-facing teams and processes alone for at least the first six months, assign a named senior executive to each of the largest accounts, and contact every major customer before they hear about the deal from someone else. Price harmonization, sales territory changes and system migrations can wait until the organization is stable.
Move first on the savings that carry least risk
Not all savings are equal. Some, such as procurement consolidation, can be captured quickly with little effect on customers or operations. Others, such as closing plants or merging core systems, carry much greater risk and should follow once the organization is settled.
A sensible sequence for most integrations looks like this:
Days 1 to 30: Combine purchasing for the largest categories, freeze discretionary spending and hiring in overlapping functions, and launch the integration office.
Days 31 to 60: Agree the design of the back-office functions, begin consultation where required and confirm savings targets by owner.
Days 61 to 100: Start consolidating back-office functions, finalize the plan for the operating footprint and lock savings into the next budget.
Doing procurement first also builds confidence. Early, visible savings make it easier to hold the line on the harder decisions that follow.
Run the integration as a business process
An integration office should be small and senior, with members from both companies. Its job is to track decisions and savings, resolve conflicts and keep the executive team focused. It should meet weekly and report against the budget, not a parallel set of numbers.
If the integration office and the finance team disagree on how much has been saved, the finance team is right.
The office should also watch for integration fatigue. Managers running the business while integrating it are doing two jobs. Sequencing changes carefully, and being willing to delay those that are not essential, is how the business keeps performing while it changes.
What to leave alone
Not everything needs to be integrated. Brands with distinct customer bases, specialized plants and teams with unique capabilities can often be left largely intact, at least at first. The test is whether combining them creates more value than it puts at risk. Many integrations destroy value by harmonizing things that were working perfectly well on both sides.
The first hundred days will not deliver most of the savings. They will determine whether the savings arrive at all.
