Post-Merger Integration
Post-merger integration is the work after completion of making two companies one — combining the people, the platforms, the products, the contracts and the compliance programmes — so that the synergies the price assumed actually arrive. It is where most acquisitions succeed or fail, and in fintech it turns on one decision: which platform survives, and how the customers are moved to it without leaving.
- Also known as
- PMI, Integration, Post-acquisition integration
- Used at
- every acquisition beyond a passive investment; planned before signing, run from day one, and usually 12–24 months long
- Binding
- no — an internal programme; but the synergy targets announced to shareholders and the regulator's expectations of continuity are commitments
- Typical structure
- an integration management office; workstreams for technology, people, customers, finance, compliance and brand; a day-one plan, a 100-day plan and a target operating model
- Typical cost
- about a year's worth of the cost synergies as one-off spend; typical loss: 5–15% of the acquired customers during a platform migration
- Parties
- the acquirer's integration team, the target's management (who know the business the integrators do not), the customers who experience the change, and the regulator for a licensed target
How post-merger integration works in practice
The plan starts before the deal closes: what the combined company will look like, which functions merge, which platform is kept, who leads what, and what day one must not break — payroll, payments, customer logins, the licence. The first hundred days set the tone: the target's team learns whether the acquirer keeps its word, the customers learn whether anything changes, and the acquirer learns what diligence missed. The longer work follows: migrating customers between platforms, merging compliance programmes so the regulator sees one, renegotiating the contracts that changed hands, and stopping the costs the synergy case counted.
In fintech the platform question dominates. Two payments companies have two processing stacks, two sets of scheme certifications, two reconciliation systems; running both is the cost the deal was meant to remove, and merging them means moving every merchant's integration, tokens and settlement to one — the moment the switching costs that held the customers vanish. The best integrations sequence the migration by customer segment, keep the target's support team through it, and measure churn weekly.
The other question is people. The target's founders and senior team hold the customer relationships and the knowledge; an integration that treats them as redundancies loses both. Retention packages, clear roles and an honest timetable for the decisions are cheaper than the churn.
Example
A payments group acquires a competitor with 900 merchants and €6m of revenue and plans to migrate them to its own platform within twelve months, removing €4m of annual platform cost. The integration office runs the migration in four waves by merchant size, keeps the target's support team and brand for the year, and offers each merchant a 90-day parallel period. Waves one to three move 640 of 700 merchants; wave four — the 200 largest — is delayed six months when three of them demand contract changes. At month eighteen, 780 merchants are on the group platform, €5.2m of the revenue is retained, the target's platform is switched off, and €4m of cost is gone. The synergy case assumed 90% retention; the group achieved 87%, a year late, and the deal still cleared its return because the price had been set on the cost synergies alone.
Common mistakes
- Deciding which platform survives after completion instead of before signing. - Migrating the largest customers first, so the biggest churn risk is taken with the least experience. - Announcing redundancies in the target's team before the customers have been moved. - Merging compliance programmes by adopting the acquirer's without checking what the target's licence requires. - Counting the synergies as delivered when the costs are budgeted rather than when they have stopped.