Post-acquisition integration.
Advisory support for the people, operating model, and organisational dimensions of integration, from 100-day planning through to full harmonisation.
What this covers
Most acquisitions are modelled on assumptions about what the combined business will look like once integration is complete. Most of those assumptions depend on people decisions: who leads the combined entity, how the operating model is redesigned, whether the acquired leadership team stays long enough to deliver the synergy thesis. Those decisions are also the ones most consistently deferred to after completion, addressed when the leverage to make them well has largely passed. Post-acquisition integration advisory covers the people, operating model, and organisational workstreams from pre-completion planning through to full harmonisation, structured to protect the value the deal was modelled to create.
When this work shows up
A PE firm or platform business is completing a bolt-on acquisition and needs structured integration planning and delivery support on the people and operating model side from pre-completion through to the end of the 100-day plan.
A carve-out transaction is completing and the buyer needs the employee population mapping, the TUPE analysis, and the integration design done in parallel with the commercial and legal close process, not after it.
A PE-backed platform business is on its second or third bolt-on and the pattern of integration friction is sufficiently clear that investing in integration capability rather than buying advisory support for each deal is the rational answer.
An integration that completed twelve to eighteen months ago has not delivered the operating model changes the VCP required, and the sponsor needs a diagnostic on what went wrong and what recovery is still possible within the hold period.
A strategic acquirer is completing an acquisition that involves overlapping leadership teams and needs the leadership population decisions made quickly and legally, before the uncertainty starts costing retention in both businesses.
How we approach it
Pre-completion: integration planning and 100-day design
The most effective integration planning starts before the transaction closes. By completion, the window to shape several critical decisions has largely passed: the employee liability picture is fixed, the acquired leadership team's uncertainty has been accumulating for weeks, and the acquired organisation has already formed views about what the deal means for them. Pre-completion planning uses the diligence findings to get ahead of that. In a PE context, the 100-day plan should feed directly into the VCP, with people integration milestones mapped to the value-creation milestones rather than treated as a parallel administrative workstream.
TUPE, employment law compliance, and harmonisation
TUPE tends to be treated as a compliance question. In most bolt-on acquisitions the compliance question is indeed straightforward. The less understood dimension is the sequencing constraint it creates. Changes to terms and conditions driven by the transfer are void under TUPE, which means the harmonisation approach has to be designed around what can be changed, in what sequence, and on what legal basis, before the integration plan is drafted, not retrofitted to it afterwards. Acquirers who discover this constraint after the integration plan has been presented to the board end up either redesigning the plan or proceeding with a harmonisation approach that will not withstand scrutiny. The TUPE analysis and harmonisation design run as a combined workstream, covering the legal constraints, the commercial priorities, and the employee communication in the sequence they need to happen.
Operating model design for the combined entity
Every acquisition has an implicit answer to the question of which operating model the combined entity runs on, embedded in the deal rationale. A bolt-on to a platform business typically absorbs into the platform model. A strategic acquisition with genuine operating model rationale may require a real design rather than an absorption. A carve-out, where the acquired business was previously supported by the parent's shared services and infrastructure, may need to build a model it has never had to run independently. Making that implicit answer explicit, testing it against the VCP or strategic rationale, and designing the structure accordingly is what separates integrations that capture synergies from integrations that model them.
Leadership population decisions and retention
Leadership population decisions are the most time-sensitive and highest-stakes element of any integration. The uncertainty created by an acquisition, about who is in, who is out, and who is in a changed role, has a direct and rapid effect on retention. Every week the population question remains open is a week in which the most mobile talent in both businesses is being approached by competitors. Speed matters, but sequence matters more: the population decisions need to be made against the operating model design, not before it, so the structure and the people who run it are designed together rather than one being retrofitted to the other. The retention design typically needs both the commercial element and the role and career clarity element. The latter is usually the more effective lever, and the one most integration plans neglect.
From the casebook
The acquired business was losing its practitioners because the integration hadn't protected what made it worth acquiring
A PE-backed professional services acquirer had completed a bolt-on acquisition eighteen months before they came to us, and the integration had stalled in a way that was beginning to show in the numbers. Practitioner attrition in the acquired entity was running above the modelled rate, client retention in that portion of the business had softened, and the integration metrics the board had been tracking had stopped improving.
The underlying cause was a parallel authority structure that had developed during the integration period. The acquirer's centralised management model, with standardised reporting lines and group-level decision authority, had been applied to a business that had operated on origination-based economics with high practitioner autonomy. The acquired practitioners found themselves accountable for revenue but without the operating environment that had underpinned their ability to generate it. The more experienced ones had begun to leave.
The engagement designed a protected operating environment for the acquired entity, with a defined 36-month convergence pathway that specified which elements of the acquirer's model would be introduced and when, and which would not be imposed at all. Accountability frameworks were rebuilt to align authority with the revenue obligations placed on practitioners, and the compensation structure was adjusted to reflect the origination economics rather than overwriting them with the acquirer's standard model.
Attrition in the acquired entity returned to pre-acquisition levels within a quarter. The integration metrics resumed their improvement trajectory, and the acquiring board had a documented rationale for the governance differences that satisfied both the portco's audit requirements and investor scrutiny.
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Who we work with
Private equity
Operating model and people advisory for PE firms and portfolio companies across the hold period.
The practice is led by Sam Bramhall.
Sam Bramhall is the Principal Consultant at Esbee, with two decades of board-level strategic HR and organisational advisory across telecoms, fintech, professional services, technology, and PE-backed businesses. Engagements are principal-led: you work directly with Sam throughout, not with a junior team managing upward.
About Sam and the firm →Frequently asked questions
- What does post-acquisition integration advisory cover?
- The advisory practice covers the people, operating model, and organisational dimensions of integration, covering the workstreams that sit between the commercial and legal integration and the operational integration. This includes the structural design decisions that determine how the combined business will be organised, the leadership and management population decisions that determine who runs it, the TUPE and employment law compliance workstream, the culture and operating model harmonisation work, and the communication and change management programme. Financial and IT systems integration are outside scope, though the advisory practice works alongside those workstreams.
- When should integration planning start?
- The answer that most acquirers discover after their first bolt-on is that it should start before close. The 100-day plan is most effective when it has been drafted in pre-completion, tested against what the due diligence has found about the target business, and ready to execute from day one post-close. In practice, even a two-week pre-completion planning phase is significantly better than starting on day one. The advisory practice can be brought in during the pre-completion period to run integration planning in parallel with the legal and financial close process.
- How does TUPE apply in a typical bolt-on acquisition?
- In a share acquisition, TUPE does not apply to the transaction itself; the employees' contracts continue with the acquired entity unchanged. TUPE applies when there is a subsequent transfer of the business or employees from the acquired entity to the acquiring entity, or when outsourced functions transfer as part of the integration. In an asset acquisition or a business transfer, TUPE typically applies from the outset. The TUPE analysis matters for integration planning because it constrains what harmonisation steps can be taken, and in what sequence. Changes to terms and conditions that are driven by the transfer are void under TUPE, which means the harmonisation approach needs to be designed around the legal constraints from the beginning, not retrofitted after the integration plan has been drafted.
- What is the 100-day plan and what should it contain on the people side?
- The 100-day plan is the structured post-close integration plan covering the first three to four months of the hold period. On the people side, it should cover: leadership population decisions (who is in the combined leadership team, what the redundancy process looks like for any overlapping roles, what the retention plan is for key talent); operating model design decisions (what the combined organisation structure looks like, what the decision rights are in the combined entity); TUPE and employment harmonisation planning (what the employee liability picture looks like, what the harmonisation programme covers and in what sequence); and culture and communication (how the integration story is communicated, to whom, and in what sequence). In a PE-backed acquisition, the people side of the 100-day plan should be structured to inform the VCP, not just to manage the integration.
- How do you handle the people side of a carve-out?
- Carve-outs introduce complexity that bolt-on acquisitions do not. The employee population in a carve-out may be a mix of people who are clearly aligned to the carved-out business, people who are shared services employees whose allocation between the parent and the carved-out entity is contested, and people on secondment or in matrix roles that span the old boundary. The TUPE analysis in a carve-out needs to be done early and carefully, because the employee liability that transfers with the business depends on which employees are in scope, and that question is often not simple. The integration advisory in a carve-out starts with the employee population mapping, establishing definitively who transfers, under what terms, and what the parent retains, before moving to the integration design.
- How does this work fit into a PE buy-and-build strategy?
- In a buy-and-build strategy, the integration capability compounds. The first bolt-on is typically the hardest because the platform business has no integration muscle: no documented process, no experienced team, and often a leadership team that is managing a live business alongside an integration for the first time. The advisory practice supports buy-and-build programmes in two modes: as a delivery partner on individual integrations, and as a practice-builder, helping the platform business develop the integration capability and process documentation that makes subsequent bolt-ons faster and less disruptive. The second mode is usually introduced after the first or second bolt-on, when the pattern of friction is sufficiently clear that the case for investing in capability rather than buying it each time is obvious.
Last reviewed: May 2026