Top 20 Financial Due Diligence (FDD) 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.

Financial Due Diligence (FDD) advisory firms play a central role in transaction processes by providing independent analysis of financial performance, earnings quality, working capital dynamics, and deal-related risks. These services are critical for private equity investors, corporate acquirers, and lenders seeking to assess the underlying financial health of target businesses.

As transaction environments have become more complex, the scope of financial due diligence has expanded beyond traditional accounting review to include forward-looking analysis, scenario modeling, and deal structuring considerations. FDD providers now operate as key advisors within the broader transaction ecosystem, working alongside M&A advisors, legal counsel, and strategy consultants.

The market is led by global professional services firms with dedicated transaction advisory practices, as well as a growing group of independent advisory specialists focused on private equity and mid-market transactions.

This ranking identifies firms that demonstrate sustained execution capability, strong sponsor relationships, and institutional credibility within financial due diligence advisory.

Market Overview

The global financial due diligence market has expanded alongside the growth of private equity and sponsor-driven transaction activity. As deal volumes have increased across both developed and emerging markets, demand for high-quality financial diligence has become more consistent and institutionalized.

Large accounting and advisory networks continue to dominate the upper end of the market, particularly for complex, cross-border transactions. These firms benefit from scale, global reach, and the ability to coordinate multi-jurisdictional diligence processes.

At the same time, independent advisory firms and mid-tier providers have gained traction, particularly in the middle market. These firms often compete on flexibility, senior attention, and speed of execution, which are critical in competitive deal environments.

Clients increasingly expect FDD providers to go beyond historical financial review and deliver insights into earnings sustainability, operational risks, and transaction structuring considerations. This has raised the bar for analytical rigor and sector understanding across the industry.

Industry Trend — 2026

In 2026, financial due diligence continues to evolve toward a more forward-looking and data-driven discipline. Private equity firms are placing greater emphasis on identifying operational risks, normalization adjustments, and value creation opportunities at the diligence stage.

One notable trend is the increasing integration of data analytics into FDD processes. Firms are leveraging advanced tools to analyze large data sets, identify anomalies, and enhance the reliability of financial insights.

Another trend is the growing importance of sector specialization. Firms with dedicated teams in healthcare, technology, consumer, and industrial sectors are better positioned to assess industry-specific risks and financial drivers.

Speed has also become a critical factor. Competitive deal processes require FDD providers to deliver high-quality outputs within compressed timelines, placing greater emphasis on experience, coordination, and execution discipline.

As a result, firms that combine technical accounting expertise with commercial awareness and transaction experience continue to differentiate themselves in the market.

Methodology — Core Eligibility Criteria

Firms were evaluated based on the following criteria:

• Provides financial due diligence services for transactions
• Demonstrates consistent involvement in buy-side or sell-side diligence
• Maintains dedicated transaction advisory or FDD teams
• Shows engagement with private equity and corporate clients
• Exhibits capability in multi-jurisdictional or complex transactions

Methodology — Ranking Factors

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

Key factors considered include:

• Track record in financial due diligence engagements
• Strength of private equity sponsor relationships
• Depth of technical accounting and financial analysis capability
• Ability to deliver clear and actionable insights
• Speed and reliability of execution in competitive deal environments
• Sector specialization and industry expertise
• Institutional reputation within transaction advisory markets

The objective of the ranking is to identify firms that maintain sustained relevance within the FDD advisory ecosystem.

The ranking universe consisted of approximately 55 FDD Advisories, 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 Financial Due Diligence Advisory Firms

Deloitte — Transaction Services / Financial Due Diligence

• Headquarters: London, United Kingdom
• Founded: 1845

Deloitte’s transaction services and financial due diligence practice is one of the largest and most established platforms in the global deal advisory market. The firm supports private equity sponsors, corporate acquirers, lenders, family offices, sovereign investors, and financial institutions across buy-side diligence, sell-side diligence, vendor assistance, carve-out analysis, working capital review, debt and debt-like item assessment, and transaction risk evaluation.

Its financial due diligence capability is integrated with tax, valuation, restructuring, operational advisory, commercial diligence, technology diligence, and post-merger integration teams. This multidisciplinary structure makes Deloitte particularly relevant for complex, cross-border, and large-cap transactions where financial diligence findings must be coordinated across several workstreams, legal jurisdictions, and stakeholder groups.

Deloitte belongs in Tier I because of its global scale, technical accounting depth, sector coverage, sponsor relationships, and long-standing role in major transaction diligence assignments. For transactions where earnings quality, cash conversion, working capital normalization, carve-out complexity, and deal-structure implications must be assessed together, Deloitte remains one of the central global reference platforms.

EY — Strategy & Transactions / Financial Due Diligence

• Headquarters: London, United Kingdom
• Founded: 1989

EY’s Strategy & Transactions division includes a major financial due diligence practice serving corporate clients, private equity sponsors, lenders, and other deal stakeholders. The firm provides buy-side and sell-side diligence, quality of earnings analysis, working capital review, debt and debt-like item analysis, carve-out support, transaction readiness, and broader deal execution support.

Its strength lies in combining financial analysis with sector insight and multidisciplinary deal support. EY can coordinate financial diligence with tax, commercial, operational, technology, cyber, human capital, sustainability, and valuation workstreams, making it particularly relevant in competitive transaction processes where acquirers require a detailed view of value drivers, financial risks, integration requirements, and post-transaction considerations.

EY belongs in Tier I because of its global transaction advisory platform, financial diligence capability, international network, private equity relationships, and relevance to large and cross-border deal processes. Its financial due diligence work is especially important where transaction decisions depend on the interaction between historical performance, normalized earnings, future cash flow, working capital, and deal execution risk.

KPMG — Deal Advisory / Financial Due Diligence

• Headquarters: Amstelveen, Netherlands
• Founded: 1987

KPMG’s deal advisory practice includes a well-established financial due diligence offering that supports private equity firms, corporate acquirers, lenders, infrastructure investors, and financial stakeholders across transaction processes. The firm provides analysis of earnings quality, working capital, cash flow, debt-like items, financial projections, historical trends, and transaction risks.

KPMG’s financial due diligence teams are especially relevant in large and mid-market transactions where clients need structured reporting, disciplined financial analysis, clear issue identification, and cross-border coordination under tight deal timelines. Its global footprint allows the firm to coordinate diligence work across multiple jurisdictions, sectors, and transaction structures.

KPMG belongs in Tier I because of its technical accounting capability, global consistency, transaction advisory depth, and long-standing role in the financial due diligence market. The firm’s value-focused diligence model is suited to transactions where financial analysis must move beyond mechanical review and connect earnings quality, value drivers, downside risks, and completion considerations.

PwC — Deals / Transaction Services / Financial Due Diligence

• Headquarters: London, United Kingdom
• Founded: 1998 current platform; legacy firms earlier

PwC’s deals and transaction services practice is one of the most prominent financial due diligence platforms globally. The firm advises corporate acquirers, private equity investors, financial institutions, lenders, and sellers on buy-side diligence, vendor due diligence, working capital analysis, debt and debt-like items, carve-outs, transaction readiness, and deal execution.

Its model combines financial diligence with tax, valuation, operational, commercial, ESG, technology, integration, and post-deal advisory capabilities. PwC is particularly strong in complex transactions where diligence findings must be translated into pricing, negotiation strategy, sale and purchase agreement considerations, integration planning, and broader transaction decision-making.

PwC belongs in Tier I because of its global deals platform, sponsor and corporate relationships, technical depth, sector coverage, and role in major financial due diligence assignments. Its transaction services practice is especially relevant where buyers and sellers require a coordinated view of earnings quality, cash generation, working capital requirements, financial adjustments, and post-close execution risks.

Alvarez & Marsal — Global Transaction Advisory Group

• Headquarters: New York, United States
• Founded: 1983

Alvarez & Marsal’s Global Transaction Advisory Group is one of the leading independent alternatives to the Big Four in financial due diligence. The firm is particularly well known for working with private equity sponsors, lenders, and corporate acquirers on quality of earnings, working capital, cash flow, debt-like items, carve-outs, tax diligence, and integrated transaction diligence.

A&M differentiates itself through its operational heritage and senior-led advisory model. Its diligence approach often extends beyond accounting review to assess the underlying drivers of earnings quality, operating performance, cash conversion, value creation potential, and post-close execution risk. This is especially relevant for sponsor-backed transactions where deal execution and post-close value creation are closely linked.

Alvarez & Marsal belongs in Tier I because of its independent transaction advisory platform, private equity credibility, global reach, operational perspective, and strong execution capability in financial due diligence. It provides a distinct Tier I profile: technically strong enough to compete with large accounting platforms, but also closely associated with operational performance, restructuring judgment, and transaction-critical execution.

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Tier II — Established FDD Advisory Firms

(Alphabetical order)

Accuracy

• Headquarters: Paris, France
• Founded: 2004

Accuracy is an independent advisory firm with strong transaction services and financial due diligence capabilities. The firm supports private equity investors, corporate acquirers, lenders, and legal advisers in transactions requiring financial analysis, valuation insight, carve-out support, transaction preparation, and deal execution advice.

Its financial due diligence work is particularly relevant in European and cross-border transactions where clients require senior-led analysis, flexible delivery, and commercially grounded transaction advice. Accuracy’s positioning as an independent advisory firm gives it a distinct profile in situations where conflicts, timing pressure, specialist expertise, or transaction complexity matter.

Accuracy belongs in Tier II because of its independent advisory identity, financial due diligence capability, European transaction experience, and relevance to complex buy-side and sell-side deal processes. The firm adds a senior-led European advisory dimension to the ranking and is particularly appropriate for transactions where financial analysis must be linked to strategic judgment, valuation logic, and negotiation support.

Baker Tilly

• Headquarters: London, United Kingdom / Chicago, United States
• Founded: 1987 global network; U.S. platform legacy earlier

Baker Tilly operates as a global advisory, tax, and assurance network with developed transaction advisory and due diligence capabilities. Its financial due diligence teams support private equity sponsors, corporate buyers, lenders, and sellers in assessing historical performance, quality of earnings, working capital, operational trends, financial reporting issues, and transaction risks.

The firm is especially relevant in middle-market transactions where clients require practical analysis, sector familiarity, and flexible deal support. Baker Tilly’s network structure allows it to serve cross-border clients while maintaining a strong mid-market orientation and practical transaction execution profile.

Baker Tilly belongs in Tier II because of its transaction advisory capability, broad operating footprint, middle-market focus, and relevance to financial due diligence assignments across private equity and corporate transactions. Its role is strongest where clients require a balance of accounting discipline, transaction judgment, tax coordination, and execution support.

BDO

• Headquarters: Brussels / Zaventem, Belgium
• Founded: 1963

BDO is a global accounting and advisory network with a significant due diligence and transaction advisory offering. The firm supports buyers, sellers, private equity investors, lenders, and corporate clients through financial due diligence, quality of earnings analysis, working capital assessment, tax due diligence, transaction-related financial review, and deal advisory support.

BDO’s financial due diligence practice is particularly relevant in mid-market and regional transactions, where clients require a balance of technical accounting expertise, sector experience, local market understanding, and international coordination. Its network structure allows it to support diligence work across multiple jurisdictions without losing its middle-market orientation.

BDO belongs in Tier II because of its global advisory network, mid-market transaction strength, due diligence capability, and relevance to regional and cross-border financial diligence assignments. The firm is especially useful where clients need disciplined financial review supported by local market access, sector familiarity, and practical deal execution.

Crowe

• Headquarters: Chicago, United States
• Founded: 1942

Crowe provides accounting, advisory, tax, and consulting services with an established presence in transaction advisory and due diligence. The firm supports corporate buyers, private equity investors, family-owned companies, and middle-market businesses in evaluating transaction risks, historical performance, quality of earnings, working capital, tax exposure, valuation issues, and deal-related financial questions.

Its financial due diligence work is relevant for clients that need practical transaction support across quality of earnings, working capital, tax diligence, valuation, integration planning, and broader deal advisory. Crowe’s strength lies in its sector knowledge and middle-market accessibility, particularly in industries such as financial services, healthcare, manufacturing, technology, and consumer-facing businesses.

Crowe belongs in Tier II because of its advisory platform, transaction diligence capability, sector knowledge, and relevance to middle-market financial due diligence assignments. It provides a practical and accounting-grounded alternative to the largest transaction advisory platforms while retaining sufficient institutional scale for complex transaction support.

Eight Advisory

• Headquarters: Paris, France
• Founded: 2009

Eight Advisory is an independent transaction, restructuring, and transformation advisory firm with strong financial due diligence capabilities. The firm supports private equity sponsors, corporates, lenders, and investors across buy-side diligence, sell-side diligence, vendor assistance, refinancing support, carve-outs, independent business reviews, and transaction-related financial analysis.

Its specialist advisory identity gives it a strong position in transaction-focused mandates. Eight Advisory is closely associated with financial due diligence, restructuring, transformation, and value creation, making it particularly relevant for clients seeking senior-led execution in competitive deal environments. Its European base and international project experience give it a clear profile in cross-border and sponsor-backed transactions.

Eight Advisory belongs in Tier II because of its independent transaction advisory profile, financial due diligence strength, European market presence, and relevance to private equity and corporate transaction processes. It adds a specialist European transaction services platform that is more focused than broad accounting networks and more directly aligned with financial diligence execution.

EisnerAmper

• Headquarters: New York, United States
• Founded: 1963

EisnerAmper is a professional services firm with transaction advisory capabilities across financial due diligence, tax due diligence, IT due diligence, valuation, and deal support. The firm serves private equity investors, strategic acquirers, lenders, founder-led businesses, and middle-market companies evaluating acquisitions, divestitures, recapitalizations, and financing events.

Its financial due diligence work is especially relevant in middle-market transactions where clients need detailed analysis of historical financial performance, normalized earnings, working capital, revenue trends, customer concentration, tax exposure, and operational risks. EisnerAmper’s combination of accounting, tax, advisory, and industry expertise gives it a practical role in transaction execution.

EisnerAmper belongs in Tier II because of its established advisory platform, middle-market diligence capability, transaction support services, and relevance to financial due diligence work across acquisitions, divestitures, and investment processes. It is particularly appropriate where clients need hands-on, accounting-led transaction support with enough advisory breadth to address related tax, valuation, and IT issues.

FORVIS Mazars

• Headquarters: Paris, France / Charlotte, United States
• Founded: 2024 current global network; legacy firms earlier

FORVIS Mazars is a global professional services network formed through the combination of FORVIS and Mazars, with advisory, audit, tax, and transaction services capabilities across multiple markets. Its transaction services practice supports acquisitions, disposals, reorganizations, financing events, and financial due diligence assignments for corporate and financial clients.

The firm’s financial due diligence relevance comes from its combination of global reach and middle-market orientation. It can support cross-border transactions while offering a flexible alternative to the largest accounting networks. Its transaction services teams provide analysis of financial performance, tax and financial risks, working capital, deal structure, carve-outs, and transaction-related issues.

FORVIS Mazars belongs in Tier II because of its global professional services platform, transaction advisory capability, financial diligence offering, and relevance to cross-border and mid-market deal processes. The current platform name is the appropriate public-facing entry, as it reflects the combined global network now operating under the FORVIS Mazars brand.

Grant Thornton

• Headquarters: London, United Kingdom
• Founded: 1924 legacy; current international network evolved later

Grant Thornton provides transaction advisory and financial due diligence services through a global network serving corporate clients, private equity investors, lenders, and business owners. The firm supports buy-side diligence, sell-side diligence, vendor assistance, transaction readiness, working capital analysis, commercial diligence, tax diligence, and broader deal advisory work.

Its financial due diligence teams are particularly active in the middle market, where clients need technical financial analysis combined with sector knowledge, practical deal execution, and local-market understanding. Grant Thornton’s balance between global coverage and mid-market focus makes it a relevant alternative for sponsor-backed and corporate transactions.

Grant Thornton belongs in Tier II because of its global advisory network, middle-market transaction strength, financial diligence capability, and relevance to private equity and corporate deal processes. The firm is especially useful where transaction analysis must combine earnings quality, working capital, tax exposure, commercial context, and pragmatic deal execution.

Kroll — Transaction Advisory Services

• Headquarters: New York, United States
• Founded: 1972 current Kroll legacy; Duff & Phelps valuation legacy earlier

Kroll’s transaction advisory services practice provides financial due diligence, quality of earnings analysis, tax diligence, IT diligence, operational diligence, accounting advisory, and transaction-related support. The firm serves private equity sponsors, lenders, corporates, investment banks, and investors in complex transaction environments.

Kroll is especially relevant where financial diligence intersects with valuation, risk, disputes, governance, and complex deal situations. Its broader advisory platform gives it a distinctive position in transactions that involve contested value, material risks, regulatory considerations, lender scrutiny, or sensitive capital decisions.

Kroll belongs in Tier II because of its transaction advisory platform, financial due diligence capability, risk and valuation expertise, and relevance to complex private equity, corporate, and lender-led transactions. It is not as central to mainstream FDD as the Big Four or A&M, but it provides a strong specialist-advisory layer where financial analysis must connect with valuation, governance, risk, and transaction defensibility.

RSM

• Headquarters: London, United Kingdom
• Founded: 1964

RSM is a global accounting and advisory network focused strongly on middle-market clients, with a well-developed financial due diligence and transaction advisory offering. The firm supports private equity sponsors, corporate acquirers, sellers, and lenders in evaluating financial performance, transaction risks, working capital, deal value, and investment assumptions.

Its financial due diligence strength lies in middle-market responsiveness, sector knowledge, and cross-border coordination through its international network. RSM is especially relevant for clients that need professional diligence capability, practical transaction support, and local market knowledge across multiple jurisdictions.

RSM belongs in Tier II because of its global mid-market advisory network, financial due diligence offering, transaction support capability, and relevance to middle-market and cross-border deal processes. Its position is strongest where clients require accessible, practical, and technically disciplined diligence support rather than the largest global transaction services platform.

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Tier III — Specialist FDD Advisory Firms

(Alphabetical order)

Cherry Bekaert

• Headquarters: Raleigh, United States
• Founded: 1947

Cherry Bekaert is an accounting and advisory firm with a developed transaction advisory practice serving private equity firms, corporate buyers, sellers, lenders, and middle-market businesses. Its deal advisory services include financial due diligence, tax due diligence, IT diligence, valuation, operational review, commercial diligence coordination, and related transaction support.

The firm is particularly relevant in U.S. middle-market transactions, where buyers and sellers need practical diligence support, clear financial analysis, and execution-oriented advisory. Cherry Bekaert’s private equity focus and transaction practice give it meaningful relevance in quality of earnings review, working capital assessment, buyer-oriented diligence, and transaction planning.

Cherry Bekaert belongs in Tier III because of its middle-market advisory profile, transaction support capabilities, private equity relevance, and financial due diligence work across U.S. deal processes. The Cherry Bekaert name remains the cleaner current entry, particularly after its expansion through Herbein while retaining the Cherry Bekaert brand.

Citrin Cooperman

• Headquarters: New York, United States
• Founded: 1979

Citrin Cooperman is a professional services firm with transaction advisory capabilities across buy-side diligence, sell-side support, financial analysis, tax review, value creation, and broader M&A advisory services. The firm serves middle-market businesses, private equity sponsors, family-owned companies, founder-led businesses, and strategic acquirers.

Its financial due diligence role is strongest in transactions where clients require detailed review of earnings quality, financial trends, risks, working capital, tax exposure, and transaction readiness. Citrin Cooperman’s advisory model is practical and middle-market oriented, making it relevant for clients that need hands-on support from an accounting-led transaction team.

Citrin Cooperman belongs in Tier III because of its transaction advisory capability, middle-market focus, private equity relevance, and role in financial due diligence and deal-support assignments. It provides a focused U.S. middle-market perspective and strengthens the specialist layer of the ranking without duplicating the broader global accounting networks.

CLA — CliftonLarsonAllen

• Headquarters: Minneapolis, United States
• Founded: 2012 current platform; legacy firms earlier

CLA is a professional services firm providing audit, tax, advisory, outsourcing, wealth advisory, and deal services to middle-market clients, private companies, owners, and investors. Its transaction advisory work includes financial due diligence, quality of earnings analysis, valuation, transaction support, owner transition advisory, sell-side diligence, transaction tax, and working capital analysis.

CLA is especially relevant in transactions involving closely held businesses, founder-owned companies, private equity portfolio companies, regional operating businesses, and middle-market acquisitions. Its advisory model combines accounting discipline with practical owner-focused deal support, making it relevant to private-company transaction diligence.

CLA belongs in Tier III because of its middle-market advisory platform, private-company transaction expertise, deal-support capability, and relevance to financial due diligence work involving owner-led and sponsor-backed businesses. It broadens the ranking beyond global accounting networks by adding a large U.S. advisory firm with strong private-company and regional-market exposure.

CohnReznick

• Headquarters: New York, United States
• Founded: 2012 current platform; legacy firms earlier

CohnReznick is a professional services firm with an active transaction advisory practice supporting buyers, sellers, investors, lenders, and private equity participants. Among a range of advisory, assurance, and tax services, the firm provides financial due diligence, acquisition integration support, financial analysis, tax-related transaction support, and other transaction-related advisory services.

Its financial due diligence work is particularly relevant in middle-market and sector-specific transactions, including real estate, renewable energy, technology and new media, healthcare, manufacturing and distribution, business services, construction and engineering, consumer products, government-related markets, and private equity-backed situations. CohnReznick’s advisory practice supports clients across the transaction lifecycle, from pre-transaction diligence and financial review to post-close planning and execution support.

CohnReznick was included in Tier III in recognition of its established advisory platform, middle-market transaction experience, sector-specific diligence capability, and relevance to financial due diligence work across private equity, corporate, real estate, energy, and growth-market transactions.

MNP

• Headquarters: Calgary, Canada
• Founded: 1958

MNP is one of Canada’s major accounting, tax, and business advisory firms, with transaction advisory and corporate finance capabilities. The firm supports clients in acquisitions, divestitures, due diligence, financing, valuation, restructuring, succession, and related deal processes.

Its relevance to this ranking comes from its Canadian market position and ability to support middle-market companies, private equity investors, lenders, and business owners through transaction diligence. MNP provides localized expertise in a market where cross-border and regional transactions often require practical financial analysis, sector knowledge, tax coordination, and transaction support.

MNP belongs in Tier III because of its Canadian advisory platform, transaction diligence capability, middle-market focus, and relevance to regional and cross-border financial due diligence assignments. It adds geographic balance to the ranking and provides a credible specialist profile for Canadian private-company, sponsor-backed, and owner-led transaction work.

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Remarks

Financial due diligence remains a core component of transaction processes, providing essential insights into financial performance, risk, and deal structure. As transactions become more complex and time-sensitive, the role of FDD providers continues to expand.

As demand for specialized expertise grows, boutiques with strong sector focus, robust analytical frameworks, and established client relationships are expected to maintain their relevance in increasingly competitive advisory markets.

Tier classification reflects relative institutional positioning within the strategy consulting segment and does not represent performance rankings or investment recommendations.

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