Insights — Acquisition & Buy-and-Build — 3 min read
Assessing Customer Overlap in a Potential Acquisition
Is customer overlap a good thing or a bad thing? The answer depends on your strategy. Here is how to assess the overlap before the deal.
In short
Customer overlap—where both the acquirer and the target serve the same clients—presents both an opportunity for consolidation and a risk of revenue concentration. High overlap is beneficial for 'market share' acquisitions where cost synergies are the goal, but it reduces the diversification benefit. Conversely, low overlap indicates a high 'market expansion' potential, provided the acquirer has a clear plan to sell their existing products to the new customer base. Assessing this overlap requires analysing customer lists, sector focus, and purchasing patterns early in the process.
When two companies in the same industry merge, the first thing everyone looks at is the customer list. There is a common misconception that more overlap is always better, or that no overlap is always better. In reality, the 'ideal' level of overlap is entirely dependent on your acquisition thesis.
Understanding customer overlap is critical for setting realistic post-acquisition revenue targets and for identifying potential 'churn' risks where a customer may not want to be so dependent on a single supplier. This article explores the commercial implications of overlap and how to assess it without full data room access. Evans provides commercial research and customer base analysis; we do not provide financial due diligence or legal advice.
The Overlap Spectrum: Consolidation vs. Expansion
Where a deal sits on the overlap spectrum determines the primary source of value. It is vital to be honest about which strategy you are pursuing.
| Overlap Level | Primary Strategy | Main Benefit |
|---|---|---|
| High (>50%) | Consolidation / Market Power | Operational efficiency and cost synergies |
| Medium (20-50%) | Hybrid / Defensive | Securing market share while adding some new reach |
| Low (<20%) | Expansion / Diversification | Access to entirely new accounts and sectors |
When High Overlap is Good: The Efficiency Play
If your goal is to reduce costs and increase margins by combining two similar operations (a 'bolt-on' acquisition), high overlap is excellent. You can often serve the same customers with a single sales team, one delivery fleet, and a unified support structure. In this scenario, you aren't buying new customers; you are buying the ability to serve existing customers more profitably.
When High Overlap is a Risk: The Concentration Trap
High overlap has a significant downside: it increases your exposure to a single customer's fortunes. If both you and the target are heavily dependent on 'Client X', and Client X decides to diversify their own supply chain after the merger, you could lose revenue from both sides of the deal simultaneously. Acquirers must look for 'dual-sourcing' strategies among their top clients before closing.
Low Overlap: The Cross-Sell Opportunity
Low overlap is the holy grail for 'cross-sell' strategies. If you sell Product A and the target sells Product B to a completely different set of customers in the same industry, the goal is to sell Product A to their customers and Product B to yours. This is where '1 + 1 = 3' happens. However, this is harder than it looks—it requires a sales team capable of selling the new range and a customer base that genuinely needs both.
Assessing Overlap Without Sensitive Data
In the early stages, you won't have a full customer list. You can estimate overlap by looking at:
- Publicly named 'key clients' in case studies or on websites.
- Sector focus: Do they serve the same sub-segments (e.g., 'Tier 1 Automotive' vs 'Aftermarket')?
- Geographic spread: Do they operate in the same towns or regions?
- Trade references: Who do they exhibit next to at trade shows?
- Acquisition Opportunity Engine: Identifying market positioning and customer-type signals that suggest probable overlap.
Post-Acquisition Customer Churn
Regardless of the overlap level, acquisitions always carry a risk of customer churn. Customers may be loyal to the target's founder, or they may simply dislike the uncertainty of a change in ownership. A 'good' acquisition target has a diversified enough customer base that the loss of a few accounts during integration doesn't break the deal thesis.
Using the Customer Expansion Engine post-acquisition can help you systematically map these new relationships and identify where the most immediate cross-sell opportunities lie, turning 'potential' overlap into real revenue.
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