Best Resources for PE Operating Partners to Source Merger Integration Consultants for Bolt-On Acquisitions

A bolt-on acquisition can look straightforward in the investment memo: add a business to an established platform, consolidate selected functions, and capture the value of greater scale. The work after closing is usually less tidy. Customers need continuity, employees need clear direction, systems may not connect, and platform leaders must absorb another business while running their own.

That is why sourcing the right merger integration consultant matters. An operating partner needs someone who can work with the portfolio company’s leadership team, establish ownership of decisions, and help execute the integration. A strong presentation is useful, but it does not tell you whether the proposed team can manage a difficult transition.

The best sourcing process draws on several resources, then tests each candidate against the specific demands of the acquisition.

1. Start with operating partners and portfolio company leaders who have used the firm

A referral from another sponsor is useful. A referral from the CEO, COO, or CFO who worked alongside the consultants can be even more revealing.

Ask what the firm was hired to do, who actually led the work, and what happened when the integration encountered resistance or an unexpected dependency. Find out whether the consultants helped the company make decisions and complete the work, or primarily maintained a plan and reported status.

The closest reference is a leader who integrated a bolt-on of similar size and complexity into an existing platform. A firm that excelled on a large standalone merger may still be a poor fit for a smaller acquisition with limited management capacity.

2. Ask your transaction network for names, then verify the delivery work

Investment bankers, diligence providers, lenders, and transaction attorneys see many firms across the deal lifecycle. They can help you identify consultants with relevant sector experience or a history of working with your sponsor.

Clarify the nature of that experience. Supporting diligence, preparing a value creation plan, and running an integration are different assignments. For this search, ask specifically who managed the work after close, coordinated functional leaders, resolved dependencies, and tracked whether expected benefits were realized.

3. Look across prior portfolio company engagements

Your own portfolio may be the strongest sourcing resource. Review prior integrations, including those where the original scope was narrow. A consultant who successfully handled an ERP transition, operating model redesign, commercial integration, or Integration Management Office (IMO) may be suitable for a broader mandate.

Speak with the portfolio executives involved before extending the scope. Ask which capabilities were demonstrated directly and where other specialists were needed. This helps you build a shortlist around observed performance rather than a firm’s full list of advertised services.

4. Search for firms with evidence tied to your integration problem

Online searches are useful for discovering firms outside your immediate network. Search by the work you need completed, not only by “top M&A consulting firms.” Useful searches might include:

• Bolt-on acquisition integration consultants for middle-market companies

• Integration Management Office support for PE-backed platforms

• Acquired company ERP migration and process integration

• Post-acquisition organizational design and accountability

• Commercial integration after a bolt-on acquisition

Read beyond a firm’s headline claims. Look for examples that describe the situation, the firm’s role, the decisions it helped make, and the work completed. A case study should make it possible to distinguish direct integration leadership from a limited advisory role.

Stonehill’s post-merger integration consulting services and private equity integration approach provide examples of the scope an integration partner may cover.

5. Use specialist networks for targeted needs

Some acquisitions need a lead integration partner. Others need a specialist for a defined problem: ERP migration, cybersecurity, finance consolidation, sales coverage, supply chain, or workforce design. Specialist networks and trusted functional advisers can be effective when the work is narrow and the platform already has someone accountable for the overall integration.

If several workstreams depend on one another, decide who will manage those dependencies. A systems migration, for example, can change order processing, reporting, customer service, and employee responsibilities. Each specialist may deliver their portion successfully while the wider integration still falls behind.

What should an operating partner ask before adding a firm to the shortlist?

A first conversation should establish whether the firm understands the deal and can supply the people required to execute it. Ask:

1. Who will lead the engagement day to day? Meet that person before selecting the firm.

2. What similar bolt-on integrations have they managed? Ask what made those engagements comparable.

3. How do they translate the deal thesis into workstreams and measurable outcomes?

4. How do they divide responsibilities among the sponsor, platform leadership, acquired company, and consultants?

5. How do they handle decisions that affect customers, employees, processes, and systems at the same time?

6. What will the first 30, 60, and 100 days produce?

7. How will they report risks, decisions, milestones, and benefit realization?

Request a conversation with a client who worked directly with the proposed engagement leader. References are most valuable when they can describe how that person performed once the original plan had to change.

Match the consultant to the integration mandate

Before requesting proposals, define the outcome you need. A small acquisition being absorbed into a mature platform may need a focused integration lead and a few specialists. A platform completing several acquisitions in quick succession may need an IMO, repeatable playbooks, and stronger governance across functions.

Give each firm the same brief: the acquisition context, value creation priorities, anticipated systems and operating changes, available internal capacity, and decisions that must be made before or shortly after close. Then compare their proposed teams, responsibilities, deliverables, and assumptions. This makes fees and timelines easier to evaluate on a like-for-like basis.

The strongest candidate will show how it will protect current performance while integrating the acquired business. It should also be candid about what your leadership team must own. An integration consultant can create discipline and capacity; the sponsor and portfolio company still make the consequential business decisions.

How Stonehill supports bolt-on integrations

Stonehill works with private equity sponsors and portfolio company leaders to turn acquisition objectives into an executable integration plan. Depending on the transaction, that can include establishing an IMO, mapping processes, clarifying roles and decision rights, coordinating systems and functional workstreams, and tracking progress against the value creation plan.

Our work connects the operating model to the daily decisions required to run the combined company. For an operating partner, that means a clear view of what is on track, what is at risk, who owns the next decision, and whether the integration is delivering the intended result.

If you are building a shortlist for an upcoming bolt-on, contact Stonehill to discuss the acquisition, the platform’s integration capacity, and the support that would be useful. For a broader evaluation framework, see our guide to choosing a post-merger integration consultant.