Mergers and acquisitions that disappoint usually do so on people and integration rather than price. A strategic approach puts three things first: thorough due diligence on financial, legal and operational risk; keeping key talent and checking cultural fit; and a clear communication plan from announcement onwards. In a cross-border deal, add the employment law of each country where the target has staff, because transfer, consultation and notice rules differ.
This guide sets out ten priorities in order of urgency, what each one involves in practice, and the employment rules that most often catch buyers out in cross-border deals.
Top priorities
1. Conduct thorough due diligence: assess risk and deal fit
Due diligence should answer two questions: what could go wrong, and does this business actually serve your strategy? Cover the financial, legal, operational and people sides together, because problems in one usually show up in another.
- Financial: quality of earnings, revenue concentration, working capital and any off-balance-sheet liabilities.
- Legal: material contracts and change-of-control clauses, litigation, licences and regulatory approvals.
- Operational: key suppliers, systems, and single points of failure.
- People: headcount by country, employment contracts, pay and benefits, pension commitments, open disputes, and whether contractors are correctly classified.
Employee data shared during due diligence is personal data. Share only what the buyer needs, anonymise where you can, and agree confidentiality terms first. The UK Information Commissioner's Office covers this in its guidance on employment records in mergers and acquisitions.
2. Secure talent and cultural fit: keep the people who create the value
In many deals the value sits with a small group of people: the engineers who built the product, the account managers who hold the client relationships, the leaders who run the teams. Identify them before signing, not after.
- List the roles the business can't run without, and the people in them.
- Agree retention terms (bonuses, equity, role clarity) for those people before the deal is announced where you can.
- Compare how the two companies make decisions, set pay and work day to day. Differences in these are where culture clashes start.
3. Communicate clearly: build trust from day one
Silence fills with rumour. Plan the announcement, who hears it first, and what each group will be told: employees, managers, customers, suppliers and investors. Give managers a short briefing pack with likely questions and honest answers, including "we don't know yet" where that is true. In many countries you'll also have a legal duty to inform and consult employees or their representatives (see the cross-border section below), so build those steps into the timeline.
High importance
4. Get an accurate valuation and plan for realising value
Synergy assumptions are the part of a valuation most likely to be wrong. Test each one: who will deliver it, by when, and what it will cost to achieve. Include one-off integration costs, such as systems migration, retention payments, consultation and any restructuring, in the deal model rather than discovering them after completion.
5. Plan for smooth integration and minimise disruption
Name an integration lead with the authority to make decisions, and set up a small team that covers HR, finance, IT and operations. Decide early what will be integrated and what will deliberately stay separate. Keep payroll, benefits and access to systems running without a break for every employee on day one; a missed payroll is the quickest way to lose trust.
6. Evaluate future prospects, not just past performance
Historic results show where the business has been. Look at its market, its competitors, regulatory changes on the horizon and the strength of its pipeline to judge whether it will still fit your strategy in three to five years.
Important considerations
7. Do extensive research
Go beyond the data room. Talk to customers and former employees where appropriate, read employee reviews, and look at staff turnover and absence trends. These show the culture and morale more clearly than any presentation will.
8. Scrutinise core processes and technology
Review the technology stack, data structure, security and how core processes actually run. Check whether systems can be integrated, what licences transfer, and whether the target meets the security and data protection standards your own business has committed to.
9. Review intellectual property and protect intangible assets
Confirm who owns the patents, trademarks, copyrights, software and trade secrets the business relies on. In particular, check that employees and contractors have assigned the IP they created to the company, since contractor-created work isn't always owned by the client by default.
Cross-border deals: check employment law early
When a business changes hands, its employees often transfer with it on their existing terms. Mapping these rules for every country where the target employs people should happen before signing, because they affect timing, cost and what you can change afterwards.
- United Kingdom: the TUPE regulations protect employees' terms when a business transfers and require information and consultation with affected employees before the transfer. The seller must give the buyer information about the transferring employees at least 28 days before the transfer, and dismissals because of the transfer are automatically unfair.
- European Union: the Acquired Rights Directive (2001/23/EC) sets the same baseline: employment contracts transfer automatically, and representatives must be informed and consulted. Each member state implements it in its own law, so details and timelines vary.
- United States: there is no automatic transfer of employment; buyers usually make new offers. If an integration involves a plant closing or mass layoff, the federal WARN Act requires employers with 100 or more employees to give at least 60 calendar days' written notice. Some states have stricter versions.
If the target has staff in countries where you have no entity, they need a legal employer from completion. An Employer of Record can employ them while you decide whether to set up a local entity. Country rules are in our CountryPedia guides.
Ongoing efforts
10. Maintain open communication
Communication doesn't stop at completion. Keep regular updates going through the integration period, ask for feedback through short surveys or team sessions, and close the loop by showing what changed as a result. Track retention of key people and engagement scores in the first year, and act early if they start to slip.
A simple first-100-days plan
- Day 1: announcement, manager briefings, payroll and system access confirmed for everyone.
- Weeks 1–4: meet key people one to one, confirm retention terms, and start any legally required consultation.
- Months 2–3: align policies, benefits and reporting lines country by country; agree which systems and processes will merge.
- Day 100: review progress against the deal case, and check retention, engagement and customer feedback.
