Leading M&A Integration Experts

As the leading M&A integration experts for middle market and PE-backed companies, Stonehill turns signed deals into realized value. Most acquisitions underperform because integration is treated as an afterthought — handed to overstretched operators, run on spreadsheets, and measured by activity instead of outcomes. We exist to fix that. From day-one readiness through synergy capture, our team brings the operating discipline that determines whether a transaction delivers on its thesis or quietly erodes it.

Stonehill is the firm that makes middle market mergers work. We've led integrations across financial services, industrials, consumer, technology, and franchise platforms. Our consultants are former operators and integration leads, not generalists rotated in from adjacent practices. That distinction shows up in every workstream we run and every milestone we hit.

• Day-One and First-100-Days Planning - Closing is a starting line, not a finish. We build day-one readiness plans that protect customers, employees, and revenue from the moment the deal goes live. Our first-100-days roadmaps sequence the decisions that matter — leadership alignment, communication cascades, system continuity, contract assignments, and quick-win synergy capture — so momentum compounds instead of stalling at the close.

• Integration Management Office (IMO) Leadership - Stonehill stands up and runs Integration Management Offices that hold the deal accountable to its thesis. We chair steering committees, manage workstream leads, track synergies against the model, and surface risk before it becomes cost. Whether embedded full-time or in an advisory capacity, our IMO leaders bring the cadence, tooling, and executive presence that middle market acquirers rarely have in-house.

• Synergy Capture and Value Realization - Deal models promise synergies; integration delivers them. As M&A integration experts, we translate cost and revenue synergies into owned, measurable initiatives — with baselines, run-rate targets, and reporting that ties back to the investment thesis. We hold workstreams accountable for capture, not just identification, and we re-baseline when reality requires it.

• Functional Workstream Execution - Finance, HR, IT, operations, sales, and procurement each carry their own integration risk. We lead functional workstreams or augment client teams across all of them — chart of accounts harmonization, payroll and benefits consolidation, ERP and CRM convergence, network rationalization, customer migration, and procurement consolidation. Every workstream connects back to the IMO so dependencies are surfaced, not discovered.

• Carve-Outs and Transition Services Agreements (TSAs) - Divestitures and carve-outs demand the same integration rigor in reverse. We build TSA scopes, separation roadmaps, and standalone operating plans that protect both seller and buyer through the transition window. Our team has led carve-outs across consumer, industrial, and technology platforms, including complex multi-entity separations with 12-plus-month TSA runways.

Middle market and PE-backed acquirers choose Stonehill because we combine the operating depth of a Big Four practice with the speed, accountability, and partner-led delivery that boutique engagement demands. We don't staff junior pyramids or sell follow-on work the deal doesn't need. We size the team to the integration, name the partner who owns the outcome, and stay until the synergies hit the P&L.

If you have a deal in diligence, a close on the horizon, or an integration that's drifted off plan, talk to the leading M&A integration experts at Stonehill. We'll tell you what's working, what isn't, and what it will take to make the merger deliver on its promise.