CONTEXT: This practical case makes visible what is usually invisible in a traditional M&A business case: the financial impact of cultural integration risks. It combines our own integration and transformation experience with insights from 16 interviews conducted for the study “Big Five: Why and How Culture Makes the Difference.” The figures are an illustrative model.
Due diligence is complete and the purchase agreement is signed. A larger industrial group acquires a specialist competitor with €15 million in EBITDA for €100 million.
The industrial group brings an established brand, broad sales reach and standardized systems. The specialist brings a distinctive, market-recognized brand, personal customer relationships, specialist technology expertise and fast, decentralized decision-making. Procurement, IT and administration are to be integrated. The specialist’s brand, market presence and reputation are to be preserved; its products, modules and customer relationships are intended to drive joint growth.
The principle is: integrate where scale creates value; preserve what makes the acquisition valuable—customer proximity, speed and specialist knowledge.¹ The plan is to realize significant synergies in procurement, IT, administration and cross-selling within three years. From year 4 onward, these are expected to generate an additional €10 million in EBITDA every year.
The calculations account for costs, timelines and measures that have been carefully analyzed and planned. What they do not address, however, are the conditions required to implement them. The plan also assumes that employees* will share knowledge, redistribute responsibilities, make decisions together and open up customer relationships. These cultural prerequisites are often not examined as carefully as the financial assumptions in a traditional business case.
| Werttreiber | Nachhaltiger EBITDA- Beitrag p. a. |
Jahr 1 Mio. € |
Jahr 2 Mio. € |
Jahr 3 Mio. € |
|---|---|---|---|---|
| Einkauf | 3,0 Mio. € | 1,2 | 2,1 | 3,0 |
| IT-Integration | 2,0 Mio. € | 0,6 | 1,6 | 2,0 |
| Verwaltung | 2,0 Mio. € | 0,8 | 1,4 | 2,0 |
| Cross-Selling | 3,0 Mio. € | 0,8 | 2,5 | 3,0 |
| Gesamt | 10,0 Mio. € | 3,4 | 7,6 | 10,0 |
The integration is scheduled to be completed within three years. The business case forecasts cumulative synergies of €21m in EBITDA over that period, followed by €10m EBITDA p.a.
The integration is professionally planned and organized, with operational matters taking center stage. What is not explained clearly enough, however, is the purpose of the integration—and what about the specialist’s brand, capabilities and distinctive way of working should be deliberately preserved. As a result, top performers do not know whether their experience will still matter, while employees lose their bearings, identity and sense of security.
Processes, milestones and technical workstreams are clarified, while belonging, roles and decision-making authority remain unresolved. Collaboration gets underway—but significantly more slowly, because employees are expected to act together before they know where they fit in the new company.²
No one openly refuses to work together. But employees protect their knowledge, influence, decision-making latitude and customer contacts until they understand what their place will be in the future. The integration moves forward—but later and with less financial impact.
Was Mitarbeiter erleben – und was daraus folgt.
Die Einkäufer des Spezialisten erleben, dass ihre Lieferantenkenntnis kaum zählt. Sie halten an bewährten Wegen fest; in der Industriegruppe gelten diese als unnötige Sonderfälle. Gemeinsame Standards werden erst nach 24 statt 12 Monaten akzeptiert und wirken entsprechend später.
Systemarchitekten weisen früh auf technische Abhängigkeiten hin, ihre Bedenken werden jedoch vertagt. Auch der Betriebsrat wird erst einbezogen, als Systemauswahl und Datenkonzept bereits feststehen. Da die vorgesehenen Zugriffs- und Auswertungsmöglichkeiten Fragen der Leistungs- und Verhaltenskontrolle berühren, verlangt er Änderungen. Bereits getroffene Entscheidungen müssen neu verhandelt und Teile des Systems angepasst werden. Einzelne Geschäftsprozesse funktionieren deshalb vorübergehend nicht wie vorgesehen; Excel-Listen ersetzen die geplanten integrierten Lösungen. Die Migration verzögert sich, Projektaufwand und Kosten steigen. 5
Führungskräfte erfahren, dass ihre künftigen Rollen und Entscheidungsrechte erst „später“ geklärt werden. Solange unklar bleibt, wer künftig wofür verantwortlich ist, vermeiden sie Entscheidungen mit persönlichem oder operativem Risiko. Mitarbeiter sichern sich deshalb doppelt ab und holen Freigaben bei alten und neuen Vorgesetzten ein. Entscheidungen dauern länger, Verantwortung bleibt zwischen den Strukturen liegen – und geplante Doppelbesetzungen sowie Kosten werden später abgebaut.
Cross-Selling ist fest eingeplant. Nicht geklärt ist jedoch, wer künftig den Kunden führt, wer neue Chancen bearbeitet und wie Provisionen verteilt werden. Deshalb öffnen beide Vertriebe ihre Kundenbeziehungen nur zögerlich. Hinzu kommt: Der Vertrieb der Industriegruppe hält die Lösungen des Spezialisten häufig für zu speziell. Gemeinsame Chancen werden intern oberflächlich besprochen, aber selten zusammen beim Kunden verfolgt. Die geplanten Umsatzsynergien entstehen deutlich später und in Summe geringer.
All figures in € millions
| Kategorie | Wirkung | Einordnung |
|---|---|---|
| Business Case Erosion | −5,4 Mio. € | Im Synergiehochlauf enthalten: 21,0 Mio. € geplant, 15,6 Mio. € realisiert. |
| Einmalige Zusatzbelastungen | −1,2 Mio. € | Außerhalb des Synergieplans: Projektverlängerungen, zusätzliche Abstimmung und Produktivitätsverluste. |
| Gesamte Belastung Jahre 1–3 | −6,6 Mio. € | Synergieerosion plus ungeplante einmalige Zusatzbelastungen. |
After substantial remedial work, the additional EBITDA contribution stabilizes at €8.8 million p.a. The permanent shortfall against plan is €1.2 million per year.
The industrial group consistently standardizes systems, structures and leadership positions. Its own solutions and ways of working become the sole benchmark—even where the specialist has superior knowledge, customer relationships or products. This sends a clear signal through the integration: adapting is more important than preserving the capabilities for which the company was acquired.
Employees of the industrial group therefore stick with their familiar systems and customer practices. Employees of the specialist, meanwhile, feel that their experience and former identity no longer count for much. Key performers cannot see what contribution they are expected to make in the future. Two key people leave during the IT integration, and three experienced leaders resign in the first year. Two top salespeople join a competitor, taking long-standing customer relationships with them.
The industrial group acquired more than revenue and EBITDA—it acquired capabilities. By subordinating them to its own products, processes and hierarchies, it devalues part of what it paid for.¹ ³
Was Mitarbeiter erleben – und was daraus folgt.
Die neue Lieferantenliste wird ohne die erfahrenen Einkäufer des Spezialisten festgelegt. Langjährige Partner erscheinen austauschbar; Qualität leidet unter dem Kostendruck. In der Industriegruppe gelten Abweichungen als unrentable „Ausnahmen“. Bestellungen laufen an den neuen Regeln vorbei, Lieferanten eskalieren – ein Teil der Bündelung bleibt dauerhaft aus.
Zwei erfahrene Systemarchitekten warnen, dass die Standardplattform zentrale Funktionen nicht abbildet. Als ihre Einwände ungehört bleiben und ihre Erfahrung nicht mehr zählt, kündigen sie. Externe Berater müssen Teile der Lösung ohne das spezifische Wissen neu entwickeln; Migration und Projektkosten steigen. Um den laufenden Betrieb zu sichern, wird der Integrationsumfang reduziert und einzelne Altsysteme sowie manuelle Schnittstellen bleiben bestehen. Dadurch werden die geplanten IT-Synergien auch dauerhaft nicht vollständig erreicht.
Zentrale Rollen werden überwiegend mit Führungskräften der Industriegruppe besetzt. Drei erfahrene Führungskräfte gehen; die Verbleibenden warten auf Anweisungen, statt Verantwortung zu übernehmen. Entscheidungen stauen sich, Doppelstrukturen bleiben bestehen.
Vertrieb und Entwicklung der Industriegruppe halten an der eigenen Lösung fest und ignorieren ein leistungsfähiges Modul des Spezialisten. Zwei Top-Verkäufer wechseln zum Wettbewerb und nehmen Kundenbeziehungen mit. Umsatz geht verloren; die Kundenstabilisierung bindet Management und Vertrieb.
All figures in €m
| Kategorie | Wirkung | Einordnung |
|---|---|---|
| Business Case Erosion | −10,5 Mio. € | Im Synergiehochlauf enthalten: 21,0 Mio. € geplant, 10,5 Mio. € realisiert. |
| Einmalige Zusatzbelastungen | −3,5 Mio. € | Außerhalb des Synergieplans: Rekrutierung, Einarbeitung, Kundenstabilisierung, Projektverlängerung und Managementbindung. |
| Gesamte Belastung Jahre 1–3 | −14,0 Mio. € | Synergieerosion plus ungeplante einmalige Zusatzbelastungen. |
Once the integration has stabilized, an additional €6.0 million in EBITDA p.a. is achieved. Some knowledge, customer relationships and synergies have been lost permanently; the shortfall against plan is €4.0 million per year.
What feels like friction in day-to-day work shows up in the income statement in three distinct ways.
Drei Szenarien in einer benchmarkfähigen Wertgrafik
Jahre 1–3 · Skala 0–21,0 Mio. €
Jahre 1–3 · Erosion plus Zusatzbelastungen
Ab Jahr 4 · lineare Skala 0–10,0 Mio. € p. a.
A Culture Due Diligence is not an add-on program alongside integration, nor an additional HR or change project. It is a focused, upfront assessment and design step—conducted as part of due diligence or as a Culture Assessment to prepare for the PMI phase. It strengthens the value hypothesis and translates it into a workable integration strategy.⁴
Depending on the size, complexity and international scope of the transaction, external costs for a Culture Due Diligence or Culture Assessment typically range from €70,000 to €120,000.
There is also an internal time commitment of around 10 to 30 days in total for coordinating and contributing to the analysis, conducting interviews, the necessary management dialogue, and translating the findings into integration rationale and PMI planning.
In the context of the more moderate scenario described as “Culture Is Ignored,” the maximum external cost of €120,000 is equivalent to around 1.8 percent of the modeled business case erosion of €6.6 million.
Corporate culture can rarely be covered in a single article. If you’d like to share your perspective or discuss a question, we’d love to hear from you.
If you’d like to apply these questions to your own business, book a no-obligation Compass Conversation. Together, we’ll identify the cultural opportunities and risks that matter in your situation.
If you are considering a new or ongoing integration, the Culture Risk Screening gives you an initial assessment of how well strategy and corporate culture align—a starting point for a deeper analysis.
Basis in practice: This case draws on our own transaction, integration and transformation experience, as well as observations from business owners and senior executives with long-standing responsibility. A key source is the independently published report “Big Five: Why and How Culture Makes the Difference,” which distills 16 interviews with business owners and executives and was circulated in December 2025.
The companies, events and model figures in this practical case are synthetic. The scenarios are neither forecasts nor constructed worst cases. They distill patterns that can occur in real integrations to varying degrees. The model shows the operational mechanisms through which cultural risks can delay or permanently undermine the business case.
The mechanisms described are also reflected in foundational empirical and conceptual research. These sources support the causal relationships—not the specific case figures, resignations or EBITDA values in this illustrative model.
¹ Capron, L., Dussauge, P. & Mitchell, W. (1998): Bilateral Resource Redeployment and Capabilities Improvement Following Hori-zontal Acquisitions. Industrial and Corporate Change 7(3), 453–484. DOI 10.1093/icc/7.3.453.
² Bauer, F., King, D. R. & Matzler, K. (2016): Speed of Acquisition Integration: Separating the Role of Human and Task Integration. Scandinavian Journal of Management 32(3), 150–165. DOI 10.1016/j.scaman.2016.08.001.
³ Edwards, M. R. (2024): Do Pre-merger Loyalties Help or Hinder Post-merger Retention? A Longitudinal Study. British Journal of Management. DOI 10.1111/1467-8551.12789.
⁴ Schweiger, D. M. & Goulet, P. K. (2005): Facilitating Acquisition Integration Through Deep-Level Cultural Learning Interventions: A Longitudinal Field Experiment. Organization Studies 26(10), 1477–1499. DOI 10.1177/0170840605057070.
⁵ Section 87(1) No. 6 of the Works Constitution Act (BetrVG); Federal Labour Court, decision of 8 March 2022 – 1 ABR 20/21: Co-determination in the introduction and use of IT systems suitable for monitoring performance or conduct.
Strömer, Christoph (2025): Big Five: Why and How Culture Makes the Difference. Independently published, based on 16 interviews with business owners and executives, circulated in December 2025.
Language note: For better readability, we sometimes use the generic masculine form (e.g., "decision-maker"). This always refers to people of all genders. Where appropriate, we use gender-neutral forms. More information can be found in the FAQ.
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