Post-merger integrations are planned and implemented on a case-by-case basis using proven methods, structures, and processes.

Every post-merger integration has specific objectives and a target structure for the future organization. These objectives serve as the starting point for every transaction. Their financial objectives and implementation strategy are summarized in the investment story and the business case.

The transaction can support growth or leverage synergies to reduce costs. The structure can involve either the full integration of the companies or the continued operation of parallel entities. These are just a few options for how to pursue these objectives.

The strategy and implementation of every post-merger integration are planned individually using proven methods, structures, and processes. The following questions and answers provide details on the planning and implementation of a post-merger integration.

What strategy should be pursued for post-merger integration?

The post-merger integration (PMI) strategy depends on the objectives of the transaction, the investment strategy, and the planned new structure of the companies. These factors determine which PMI strategy is most appropriate.

In the case of a full integration of the companies, post-merger integration affects nearly all areas of the business. Therefore, the strategy should very precisely define the approach—specifically, when, which functions, and how they will be integrated.

When companies continue to operate in parallel, cross-functional areas—such as human resources or IT—are often coordinated, at least in terms of their processes. In the case of partial integration, the strategy must manage expectations. This is because executives and employees often assume that certain integration measures will be implemented when they will not.

In the “Buy & Build” strategy, new growth potential is unlocked through the repeated mergers of many companies in the same industry. In this case, post-merger integration is a core function of overall corporate management.


How should post-merger integration be structured?

Ideally, post-merger integration should be prepared before the transaction takes place. The earlier preparations can begin—for example, by analyzing the different corporate cultures through “cultural due diligence”—the greater the chances of a successful post-merger integration. However, timely preparation is sometimes not possible for legal reasons.

Milestones should be established based on the objectives and strategy for post-merger integration. These milestones serve to guide the PMI process and define key areas of focus. They also enable the review of results and achievements to continuously optimize the post-merger integration.

Building a team for post-merger integration is always a key element. The team should include representatives from the key functions of the companies involved. It is also helpful to involve neutral experts who can contribute essential expertise and experience.


What are the key phases of post-merger integration?

The phases of post-merger integration are initially based on the formal steps. These primarily include the signing of the agreement and the closing of the transaction.

The formal framework has a significant impact on PMI. Often, integration measures are not possible until “closing.” This is usually the case when competitors merge.

The following timeline can serve as a guide:

Start on Day 1: Active PMI usually begins with the “signing.” This is because communication with all parties involved (the “stakeholders”) regarding the signing of the contract and the next steps begins on this day. Therefore, the PMI team should ensure that the necessary capabilities and readiness are in place for Day 1.

Through Day 10: First impressions are very important in post-merger integration. Following the initial communication on “Day 1,” the goals and vision of the transaction, as well as the key messages, should be conveyed. Face-to-face communication is particularly well-suited for this purpose, such as a
roadshow or town hall meetings.

The first 100 days: Ideally, the PMI should already be delivering initial results. The structure and narrative for the integration are defined in detail. The roadmap, including milestones for achieving goals across all areas of focus (HR, IT, sales, etc.), is in place. “Quick wins” have been identified, for example, in terms of synergies. The leadership team is in place. All key stakeholders are involved, such as customers.

Up to 1,000 days: Post-merger integration is completed. The strategic objectives of the transaction have been achieved. Lessons learned have been incorporated for future transactions or changes. The number 1,000 symbolizes the end of the PMI project phase. After that, further measures are implemented as part of the organization’s transformation.


What are the most important synergies of post-merger integration?

The most important synergies of a PMI are achieved through cost reduction, the expansion into new markets, and increased revenue. Other operational synergies support these overarching goals, for example, through the consolidation of IT systems.

The reconfiguration of resources is also essential. This means that the competencies, processes, structures, operating resources, and staffing levels required in the future are jointly replanned and reorganized.

These synergies are intended to create opportunities for investment, such as expanding the product portfolio or improving services. The synergies can even lead to a transformation of the business model as a result of the merger.

Synergies can also arise from accelerating change in corporate culture. Every PMI can give a boost to cultural change. The transformation unlocks the potential of employees, which can only be realized through joint efforts.


How is the success of a post-merger integration measured?

The most important success factors for post-merger integration are the business objectives, such as cost reductions and revenue growth. These parameters form the basis of the transaction and investment strategy. Ultimately, they determine the success of any PMI.

Post-merger integrations pursue their own objectives that contribute to economic success. Among these success factors is the achievement of PMI milestones. Employee retention is also essential to the success of a PMI; key performers should not leave the company.

The behavior of executives, employees, and customers—as the most important “stakeholders” in a PMI—is essential to success. Ultimately, these stakeholders are the ones who achieve the economic goals of an integration.


How is progress tracked and the next steps managed?

The defined milestones of a post-merger integration provide transparent and objective benchmarks for progress. The next steps can be determined by reviewing the current status. This also includes adjustments to the PMI plan if milestones are not met.

Progress can also be tracked on an ongoing basis using “Key Performance Indicators” (KPIs). In a post-merger integration, key KPIs include turnover among executives and employees. Customer satisfaction and service quality should not decline during the PMI.

The evaluation of milestones and KPIs provides important information for the next steps in the PMI. Necessary adjustments to the measures can be made with precision, and resources for the integration can be utilized optimally.


What are the biggest challenges in post-merger integration?

The first challenge in integrations is that the transaction’s goals are too ambitious. These goals give rise to unrealistic expectations for PMI, such as regarding potential synergies in costs and revenue.

During the integration, challenges arise from incomplete analyses and incorrect assessments of the initial situation—for example, regarding the status of IT systems. Insufficient resources for implementing PMI can also create complex challenges. Milestones may not be met.

Corporate culture and the reactions of stakeholders present further challenges. Their needs are misjudged; resistance is underestimated, and their willingness to cooperate is overestimated. The challenge then becomes restoring the participation of those involved.


How do you deal with different corporate cultures?

Corporate culture is a crucial aspect of any post-merger integration. As the well-known saying goes, “Culture eats strategy for breakfast.” Yet, in most cases, culture is still given too little attention.

Differences in corporate cultures can be identified through what is known as “cultural due diligence” (CDD). CDD consists of various measures. Interviews with executives and focus groups with employees are an essential element of CDD.

The results of a “cultural due diligence” can be used to improve the planning and measures for a post-merger integration. The transaction’s objectives become more achievable once the corporate cultures are understood and potential sources of conflict have been identified.


How should resistance from management and employees be handled during the integration process?

Resistance should be incorporated into the post-merger integration process. Different perspectives from management or employees can provide insights that help optimize post-merger integration. Those who express frustration or actively voice differing opinions are still invested in the integration.

At the same time, potential negative effects should be mitigated if resistance becomes destructive or if it threatens to derail the post-merger integration process as a whole. Clear communication is key to addressing this. The limits of resistance should be made clear, specifying which issues are non-negotiable. In some cases, the solution may also involve parting ways with the employees in question.

Silence, inaction, and internal immigration are the most dangerous forms of resistance. In this situation, work performance also declines, for example, due to higher rates of sick leave. A PMI team should be very attentive to signs of this “silent resistance.”


When is a post-merger integration complete?

Post-merger integration is a long-term project that can take two to three years. This is because the integration of key structures and systems is often highly complex.

Among the complex issues involved in PMI are typically the integration of IT systems and human resources management. Employment contracts and career paths can vary greatly in structure and content.

Corporate culture develops over the very long term, even beyond the PMI process. It can take many years for executives and employees to develop shared core values.