Top 20 M&A Integration and Separation Advisory 2026

This report forms part of the Ranking News Advisory series, which evaluates specialized advisory firms across global strategy, transaction, and corporate advisory markets.

M&A integration and separation advisory boutiques play a critical role in the execution phase of transactions, supporting organizations in realizing value following mergers, acquisitions, and divestitures. These firms focus on translating deal rationale into operational outcomes, ensuring that strategic objectives are effectively implemented.

Integration advisory involves aligning organizations, systems, and processes following a transaction, while separation advisory focuses on carving out business units and establishing standalone operations. Both require detailed planning, execution discipline, and coordination across multiple stakeholders.

Unlike strategy consultants, who focus on pre-deal planning, or transaction advisors, who support deal execution, integration and separation specialists operate in the post-signing phase, where value creation is determined by execution quality.

This ranking identifies advisory boutiques that demonstrate consistent engagement in integration and separation projects across global transaction environments.

Market Overview

The integration and separation advisory market has grown significantly alongside increasing M&A activity and corporate portfolio restructuring. As organizations pursue acquisitions and divestitures, the need for structured execution has become more pronounced.

Post-merger integration (PMI) is critical for achieving expected synergies, while carve-outs and separations are essential in divestitures, spin-offs, and restructuring initiatives. Both require coordination across finance, operations, IT, and human capital functions.

Boutique advisory firms have gained traction in this space by offering specialized expertise and hands-on execution capabilities. Unlike large consulting firms, these boutiques often operate with lean teams and senior involvement, allowing for more focused delivery.

Private equity firms are also key clients, particularly in portfolio company transformations where rapid integration or separation is required to support investment objectives.

Industry Trend — 2026

In 2026, integration and separation advisory continues to evolve toward greater execution intensity and operational precision. Organizations are placing increased emphasis on achieving measurable value creation outcomes within shorter timeframes.

One key trend is the growing importance of integration planning during the pre-close phase. Firms are increasingly involved earlier in the transaction lifecycle to ensure smoother execution post-close.

Carve-out complexity is also increasing, particularly in cross-border transactions where regulatory, operational, and cultural factors must be managed simultaneously.

Another trend is the focus on value realization, with clients expecting advisors to go beyond execution planning and deliver tangible performance improvements.

Technology integration, data migration, and operational alignment have become central components of both integration and separation processes.

Methodology — Core Eligibility Criteria

Firms were evaluated based on the following criteria:

• Provides integration and/or separation advisory services
• Demonstrates involvement in post-merger or carve-out execution
• Maintains focus on execution rather than strategy
• Exhibits cross-functional coordination capabilities
• Shows engagement with corporate clients or private equity sponsors

Large consulting firms and generalist advisory platforms were excluded.

Methodology — Ranking Factors

Firms included in the ranking were evaluated using a combination of qualitative and structural considerations. Key factors include:

• Experience in post-merger integration and carve-out execution
• Ability to deliver measurable value realization outcomes
• Strength of client relationships
• Execution capability across functional areas
• Involvement in complex or cross-border transactions
• Senior-level engagement and delivery model
• Institutional credibility in post-deal environments

The ranking universe consisted of approximately 70 M&A Integration & Separation Advisory Boutiques globally, from which 20 institutions were selected for inclusion.

Tier classifications reflect relative institutional positioning and do not represent performance rankings or recommendations.

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Tier I — Leading M&A Integration and Separation Advisory Boutiques

Accordion

• Headquarters: New York, United States
• Founded: 2009

Accordion is a private-capital-focused advisory firm with strong relevance across M&A integration, carve-out planning, finance transformation, value creation, and sponsor-backed execution. Its work is especially aligned with private equity firms and portfolio companies that require practical post-signing and post-closing support rather than only pre-transaction strategy.

The firm’s relevance to this category comes from its combination of finance, transaction, operating-model, and execution support. M&A integration and separation work often depends on Day 1 readiness, management reporting, stranded-cost planning, operating cadence, and the translation of transaction objectives into practical workstreams.

Accordion was included in Tier I in recognition of its private equity orientation, finance-transformation capabilities, and established position in sponsor-backed integration and carve-out advisory. Its platform provides a strong reference point for transaction execution work involving complex ownership change.

CrossCountry Consulting

• Headquarters: McLean, United States
• Founded: 2011

CrossCountry Consulting is an advisory firm serving finance, accounting, operations, technology, and transaction-related transformation needs. Its M&A capabilities include integration, divestiture, carve-out, finance transformation, and transaction execution support, making it relevant for middle-market and upper-middle-market clients undergoing ownership change.

The firm is particularly suitable for M&A integration and separation work because it combines transaction advisory with functional execution. Integration and separation require finance readiness, systems migration, reporting structures, operating-model decisions, governance, and disciplined project management. CrossCountry’s broader transformation base gives it practical relevance in these post-deal workstreams.

CrossCountry Consulting was included in Tier I in recognition of its independent advisory profile, U.S. market presence, transaction execution capabilities, and ability to support complex integration and separation mandates across finance, technology, operations, and governance.

E78 Partners

• Headquarters: Oak Brook, United States
• Founded: 2016

E78 Partners is an advisory and professional-services platform focused on private equity, portfolio companies, finance transformation, transaction execution, M&A integration, and carve-out support. Its relevance has increased through the addition of specialist transaction and post-close capabilities, including platforms such as 9Gauge and Global PMI Partners USA.

The firm provides advisory capability across integration planning, carve-out management, interim finance leadership, operating support, and transaction execution. This makes it relevant for sponsors and management teams that require hands-on execution support across finance, operations, reporting, and post-close transformation.

E78 Partners was included in Tier I in recognition of its private equity orientation, consolidated transaction-execution capabilities, and visible role in post-close transformation. Its platform is well aligned with situations where integration, separation, finance readiness, and operating support must be delivered together.

Exxelmet Solutions

• Headquarters: London, United Kingdom / European operating presence
• Founded: 2017

Exxelmet Solutions is a specialist transaction-execution and transformation advisory firm focused on business separation, carve-outs, post-merger integration, transformation management, and value creation. Its positioning is highly relevant to M&A integration and separation because it sits close to the execution layer of transactions.

The firm’s work speaks directly to the practical requirements of separation management offices, integration management offices, program execution, operating-model delivery, and accelerated value capture. These workstreams often determine whether a transaction succeeds after the investment thesis has already been agreed.

Exxelmet Solutions was included in Tier I in recognition of its specialist alignment with integration, separation, and carve-out execution. Its focused advisory model and European transaction execution profile make it a strong fit for this category.

Stout

• Headquarters: Chicago, United States
• Founded: 1991

Stout is an independent advisory firm with capabilities across investment banking, valuation, disputes, transaction advisory, and corporate finance. Its M&A integration and separation relevance comes from its work around carve-out readiness, separation assessment, standalone cost analysis, TSA support, stranded-cost mitigation, financial reporting, and operating-model implications.

The firm is broader than a dedicated integration boutique, but its independent advisory identity and specific separation-and-carve-out capabilities make it highly relevant. In many transactions, especially divestitures and sponsor-backed carve-outs, clients require not only project management support but also valuation, finance, cost, and accounting judgment.

Stout was included in Tier I in recognition of its independent advisory platform, transaction-related finance capabilities, and relevance to complex separation and carve-out situations. Its scale and technical depth support large transaction mandates while remaining compatible with a specialist advisory category.

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Tier II — Established Integration & Separation Advisory Boutiques

(Alphabetical order)

Adonis Partners

• Headquarters: Toronto, Canada
• Founded: 2015

Adonis Partners is a Canadian advisory firm focused on operational transformation, transaction support, and post-merger integration. The firm serves private equity, corporate, and growth-oriented clients that need practical execution support around value creation, integration planning, and operating improvements.

Its fit with this category comes from its emphasis on post-deal execution rather than only pre-deal assessment. M&A integration work requires operating discipline across leadership alignment, integration governance, synergy capture, customer and employee transition planning, and process standardization.

Adonis Partners was included in Tier II in recognition of its specialist transformation focus, Canadian and North American market relevance, and ability to support middle-market integration and value-creation mandates.

Burnie Group

• Headquarters: Toronto, Canada
• Founded: 2011

Burnie Group is a management consulting firm with capabilities in post-merger integration, divestiture, carve-out support, operating-model design, transformation, and value creation. Its M&A integration work is particularly relevant for companies that need Day 1 readiness, synergy tracking, governance, and practical execution support after a transaction closes.

The firm’s carve-out and divestiture capabilities also strengthen its fit within this category. Separation advisory requires transition-service planning, organizational design, systems separation, process redesign, and a clear operating model for the business after closing.

Burnie Group was included in Tier II in recognition of its specialist consulting platform, Canadian market presence, and practical execution-oriented profile across integration, carve-out, and transformation workstreams.

Clarasys

• Headquarters: London, United Kingdom
• Founded: 2011

Clarasys is an independent management consultancy with capabilities in post-merger integration, transformation, customer experience, operating-model design, and technology-enabled change. Its M&A integration relevance comes from its ability to support clients after the transaction has created operational, customer, process, and organizational complexity.

The firm is particularly relevant in the integration phase, where businesses must combine systems, teams, processes, customer journeys, and operating rhythms. This is especially important in service-heavy businesses, technology-enabled companies, and complex corporate environments where integration affects both internal operations and customer-facing delivery.

Clarasys was included in Tier II in recognition of its UK and European independent-consulting profile, transformation capabilities, and relevance to integration work where execution and change management matter alongside transaction logic.

Fortlane Partners

• Headquarters: Munich, Germany
• Founded: 1991

Fortlane Partners, formerly known as goetzpartners, is a European advisory firm with capabilities across strategy, transformation, transaction advisory, carve-outs, post-merger integration, and value creation. Its profile is particularly relevant for European corporate and private equity clients that require execution support around complex ownership transitions.

The firm’s carve-out and PMI capabilities make it a strong fit for this category. European separations often involve multiple jurisdictions, labor issues, shared-service dependencies, IT separation, regulatory obligations, and cross-border operating models. Fortlane’s transaction and transformation background allows it to support these issues beyond project coordination alone.

Fortlane Partners was included in Tier II in recognition of its European advisory profile, transaction transformation capabilities, and direct relevance to carve-out and post-merger integration mandates.

Global PMI Partners

• Headquarters: Global network / San Francisco, United States presence
• Founded: 2010

Global PMI Partners is an international network focused on post-merger integration, carve-outs, separation, and M&A execution. The platform is relevant as a continuing international Global PMI Partners network, with a specialist identity centered on integration and transaction execution.

The firm is directly aligned with this category because it is explicitly built around PMI and M&A execution. Its relevance is strongest where clients need integration playbooks, IMO structures, Day 1 planning, synergy tracking, communication discipline, and cross-border execution support.

Global PMI Partners was included in Tier II in recognition of its specialist integration label, international network structure, and focus on post-transaction execution. Its profile adds global coverage and category-specific depth to the integration and separation advisory field.

Integration Consulting

• Headquarters: São Paulo, Brazil
• Founded: 1995

Integration Consulting is an international management consultancy with origins in Brazil and capabilities across strategy, operations, transformation, implementation, and M&A-related execution. Its transaction-related work includes support from deal preparation through post-merger integration and value capture.

The firm is relevant because integration and separation work often require hands-on implementation across commercial, operational, financial, and organizational workstreams. Integration Consulting’s broader implementation background gives it credibility in situations where the transaction thesis must be converted into operational reality across multiple markets or business units.

Integration Consulting was included in Tier II in recognition of its Latin American origins, international coverage, and execution-oriented advisory model. Its broader implementation capabilities are relevant to integration, transformation, and value-capture work following ownership change.

PMI Advisors

• Headquarters: West Palm Beach, United States
• Founded: 2017

PMI Advisors is a specialist advisory firm focused on M&A integration, business continuity, divestiture, carve-out support, process optimization, and operational transition. Its name and service positioning are directly aligned with post-merger integration and separation advisory.

The firm is particularly relevant for clients that need tactical support rather than only a broad strategic study. Middle-market acquirers, sellers, and private companies often need practical help around integration governance, change sequencing, operating continuity, separation planning, and management bandwidth.

PMI Advisors was included in Tier II in recognition of its focused integration and separation advisory model, practical execution orientation, and relevance to middle-market clients requiring targeted post-transaction support.

The Poirier Group

• Headquarters: Toronto, Canada
• Founded: 2005

The Poirier Group is a boutique management consulting firm focused on operational improvement, private equity value creation, post-acquisition integration, and transformation. It serves clients that need practical operating support around growth, efficiency, supply chain, commercial execution, and transaction-driven change.

Its relevance to this category is strongest in post-acquisition integration and value creation. Many integration challenges are operational rather than purely legal or financial. Companies must align teams, improve processes, integrate supply chains, manage performance routines, and deliver the operating improvements promised in the deal thesis.

The Poirier Group was included in Tier II in recognition of its boutique consulting profile, private equity relevance, and operating-improvement capabilities. Its Canadian market presence and execution focus support integration and post-acquisition transformation work.

TriVista

• Headquarters: Irvine, United States
• Founded: 2006

TriVista is an operations advisory firm serving private equity firms, portfolio companies, and corporate clients. Its capabilities include operational due diligence, value creation, performance improvement, manufacturing and supply chain improvement, and post-merger integration.

The firm is especially relevant where integration requires operational execution rather than only finance or governance coordination. Industrial, manufacturing, distribution, healthcare, and business-services transactions often require site-level integration, procurement alignment, supply-chain changes, management-system redesign, and operational synergy capture.

TriVista was included in Tier II in recognition of its operational value-creation lens, private equity operating focus, and relevance to practical integration workstreams. Its capabilities are particularly applicable where post-merger integration depends on manufacturing, supply chain, procurement, and operating performance improvements.

Virtas Partners

• Headquarters: Chicago, United States
• Founded: 2017

Virtas Partners is a boutique advisory firm focused on mergers, acquisitions, carve-outs, integrations, separations, finance transformation, and transaction execution. Its capabilities include integration management offices, separation management offices, acquisition planning, carve-out support, and post-close execution.

The firm is directly aligned with the requirements of M&A integration and separation advisory. These mandates require disciplined program leadership, workstream coordination, finance and reporting readiness, Day 1 planning, and post-close stabilization.

Virtas Partners was included in Tier II in recognition of its focused transaction execution model, integration and separation capabilities, and established boutique advisory profile. Its category-specific precision makes it a strong fit for middle-market and sponsor-backed transaction execution work.

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Tier III — Specialist Integration Boutiques

(Alphabetical order)

Creston Advisory

• Headquarters: Dover, United States
• Founded: 2025

Creston Advisory is a boutique M&A consulting firm focused on transaction execution, integration, divestitures, and advisory support for clients undergoing ownership change. Its positioning is directly relevant to the integration and separation category, particularly for companies that need focused M&A execution help rather than broad management consulting.

The firm is narrower and less institutionally established than the Tier I and Tier II platforms, but its boutique identity is relevant to specialist integration and separation work. Its profile is best suited to targeted mandates where clients require focused transaction support, coordination, and execution discipline.

Creston Advisory was included in Tier III in recognition of its specialist M&A execution focus, integration and divestiture orientation, and emerging boutique profile.

Gotham Consulting Partners

• Headquarters: New York, United States
• Founded: 2001

Gotham Consulting Partners is a management consulting firm serving private equity firms, portfolio companies, and corporate clients. Its services include post-merger integration, carve-out planning, operational improvement, and private-equity value creation.

The firm’s relevance comes from its ability to connect transaction-related change with operating improvement. Integration and separation mandates often require more than transaction coordination; they require management alignment, process redesign, cost discipline, and operating execution.

Gotham Consulting Partners was included in Tier III in recognition of its private-equity operating-advisory perspective, middle-market execution profile, and capabilities across post-merger integration, carve-outs, and operational improvement.

Performance Improvement Partners

• Headquarters: Boca Raton, United States
• Founded: 2003

Performance Improvement Partners is a private-equity technology and operations advisory firm with carve-out, integration, IT diligence, cybersecurity, and technology transformation capabilities. Its carve-out and integration relevance is especially strong where the transaction depends on IT separation, systems migration, data readiness, and Day 1 operational continuity.

Technology is often one of the most important execution risks in carve-outs and post-merger integration. System access, cybersecurity, data architecture, application rationalization, infrastructure separation, and reporting continuity can determine whether a transition proceeds smoothly after closing.

Performance Improvement Partners was included in Tier III in recognition of its technology-specific advisory capabilities, private equity focus, and relevance to integration and separation mandates involving IT, cybersecurity, data readiness, and operational continuity.

Pepper Foster Consulting

• Headquarters: Portland, United States
• Founded: 2015

Pepper Foster Consulting is a management consulting firm with merger integration, carve-out, transformation, operating-model, and strategy-execution capabilities. Its work is relevant where clients need practical support turning transaction objectives into workstreams, governance routines, organizational changes, and execution plans.

The firm’s advisory model is especially applicable to situations where integration or separation work intersects with broader business transformation. Clients may require support across operating model design, change management, process improvement, leadership alignment, and execution discipline.

Pepper Foster Consulting was included in Tier III in recognition of its boutique consulting profile, transformation orientation, and alignment with integration and carve-out advisory needs.

Stonehill Innovation

• Headquarters: Tampa, United States
• Founded: 2016

Stonehill is a management consulting and advisory firm with carve-out, TSA, transaction support, and post-close advisory capabilities. Its relevance is strongest in middle-market transactions where clients need practical support around Day 1 planning, transition-service agreements, operating continuity, and separation execution.

The firm’s profile is particularly relevant where transaction execution requires structured coordination across business operations, technology, finance, and governance. Carve-outs and separations often depend on clear transition planning, service continuity, and operational readiness after close.

Stonehill Innovation was included in Tier III in recognition of its specialist advisory profile, middle-market transaction relevance, and capabilities across carve-outs, TSA support, and post-close execution.

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Remarks

M&A integration and separation advisory remains a critical component of transaction execution, ensuring that strategic objectives are translated into operational outcomes. As transaction complexity increases, the importance of specialized advisory in post-deal environments continues to grow.

Firms in this category are differentiated by their ability to deliver execution-focused solutions and measurable value realization. The composition of this ranking reflects a focus on boutique advisory firms with demonstrated experience in integration and separation.

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