The deal is signed, the announcement has gone out, and the hard work begins. For owner-led companies making acquisitions, integration is where value is created or quietly lost. Customers decide whether to stay. Employees decide whether to trust the new owner. Systems either connect or create confusion.
The first hundred days set the tone. A clear plan, executed calmly, gives both organisations confidence. This checklist covers the areas that matter most.
Before day one
- [ ] Integration lead appointed. One person accountable, with time to do it.
- [ ] Clear goals. What must the integration achieve, and by when?
- [ ] Operating model decided. Which parts integrate fully, which stay independent?
- [ ] Day-one communications drafted. For employees, customers, suppliers and partners.
- [ ] Key people identified. Those critical to retain, with conversations planned.
- [ ] Quick decisions made. Reporting lines, signing authorities and bank access ready for closing.
Days 1 to 30: Stabilise and listen
People
- [ ] Meet all employees, ideally in person, to explain the reasons for the acquisition and what will and will not change
- [ ] Hold individual conversations with key managers and specialists
- [ ] Answer practical questions quickly: pay, benefits, reporting, location
- [ ] Introduce the leadership of both organisations to each other
Customers
- [ ] Contact important customers personally, ideally together with the selling owner
- [ ] Reassure them about continuity of service, contacts and terms
- [ ] Listen for concerns and opportunities
Operations
- [ ] Ensure invoicing, payments and payroll run without disruption
- [ ] Keep systems unchanged unless there is an urgent reason
- [ ] Identify immediate risks, such as expiring contracts or critical suppliers
Reporting
- [ ] Agree a simple reporting pack for the acquired company
- [ ] Establish a baseline: revenue, margins, cash, pipeline and headcount
Days 31 to 60: Plan the integration in detail
- [ ] Map processes in both companies and identify where alignment matters
- [ ] Decide which systems to combine and in what order
- [ ] Identify cross-selling opportunities and agree how they will be pursued
- [ ] Review pricing, terms and customer agreements
- [ ] Clarify roles and responsibilities in the combined organisation
- [ ] Agree on shared policies, for example purchasing, approvals and HR
- [ ] Set measurable integration milestones
Days 61 to 100: Execute the first changes
- [ ] Implement the agreed first-phase changes
- [ ] Launch joint commercial initiatives with clear owners
- [ ] Align financial reporting to the group format
- [ ] Review progress against milestones with both leadership teams
- [ ] Check in with key employees and customers again
- [ ] Capture lessons for future acquisitions
Principles that make integration work
Communicate more than seems necessary
Uncertainty fills any silence. Regular, honest updates, including about what has not yet been decided, maintain trust.
Respect what made the company valuable
You bought the company for a reason. Changing too much too quickly can destroy the very qualities that made it attractive.
Move decisively on the essentials
At the same time, hesitation on clear decisions, such as reporting lines or obvious duplications, creates anxiety. Decide what you can and explain why.
Protect the core business
Integration absorbs management attention. Make sure the original company continues to perform.
Involve the selling owner thoughtfully
The previous owner can be a great asset during transition, particularly for customer relationships, but roles must be clear. Two people acting as the leader confuses everyone.
Warning signs
- Key employees leaving in the first months
- Customer complaints about service or contact changes
- Delayed or inconsistent reporting
- Integration tasks drifting without owners
- Growing tension between the two leadership teams
Each of these deserves immediate attention.
Measuring integration success
Define a small number of measures at the start and track them through the first year. Typical measures include:
- Retention of key employees
- Retention of key customers and revenue from them
- Delivery of agreed integration milestones on time
- Progress on the specific value sources that justified the acquisition, such as cross-selling or purchasing savings
- Employee sentiment in both organisations, gathered through short conversations or surveys
Review these measures monthly with both leadership teams. They give an early warning when integration drifts, and they keep attention on the reasons the acquisition was made in the first place.
The role of the selling owner after day one
In many owner-led acquisitions, the selling owner stays for a transition period. Used well, they are a bridge of trust to customers and employees. Agree clearly what they will do and what they will hand over, and set dates for each step. Make their role visible in the first weeks and then gradually reduce it, so that relationships transfer to the new organisation rather than remaining with one person.
How LXN works with owners
We work hands-on inside acquiring companies during integration, helping set up the operating model, commercial alignment, reporting and governance that turn an acquisition into a stronger combined business. Integration is where advice meets execution, and that is where we spend our time.
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