EY
UnclaimedEY is a global professional services firm offering audit, consulting, strategy, tax, and advisory services across industries.
Overview
EY is a global professional services firm providing assurance, consulting, strategy, tax, and transaction advisory services across industries. The firm helps clients solve complex business challenges through services including audit, strategy and transformation (via EY‑Parthenon), sustainability, technology, AI, cybersecurity, and workforce transformation.
Mission statement
Shape the future with confidence.
What we offer
Strategy by EY-Parthenon
Drive strategic growth and resilience for businesses globally.
ey.com →Transactions and Corporate Finance by EY-Parthenon
Comprehensive advisory services for successful transactions and corporate finance management.
ey.com →M&A Advisory and Integration
Navigate M&A processes effectively with expert advisory and integration services.
ey.com →Due Diligence Services
Gain critical insights for informed decision-making in transactions.
ey.com →EY ai – a Unifying Platform
Accelerate AI adoption and insights across services with a unified platform.
ey.com →EY Managed Services
Streamline your operations with integrated managed services across various domains.
ey.com →EY Sustainability
Comprehensive sustainable services supporting climate resilience and ESG commitments.
ey.com →Assurance Services
Provide comprehensive audit and assurance services tailored to client needs.
ey.com →Technology Transformation
Enhance your business through comprehensive technological advancements and modern solutions.
ey.com →Market segments
Market size by segment
Growth potential (CAGR)
Audit and assurance
Independent financial and non‑financial assurance services including statutory audits, sustainability assurance, financial reporting advisory and IT controls assurance.
Products: Assurance Services, Technology Transformation
Sustainability and ESG advisory
Advisory on ESG strategy, sustainability reporting, climate risk, sustainable finance and related assurance to meet regulatory and investor expectations.
Products: EY Sustainability, Assurance Services, Tax
M&A advisory and integration
End‑to‑end M&A services including deal strategy, buy‑ and sell‑side advisory, commercial and financial due diligence, integration planning and synergy realization.
Products: M&A Advisory and Integration, Due Diligence Services, Transactions and Corporate Finance by EY-Parthenon
Tax advisory and compliance
Tax planning, compliance, transfer pricing, tax function operations and controversy support across jurisdictions, including tax considerations for transactions and sustainability.
Products: Tax, EY Managed Services, Technology Transformation
Risk, compliance and forensic services
Forensic investigations, anti‑fraud, regulatory compliance assessments, internal controls, technology risk and enterprise risk management.
Products: Assurance Services, EY Managed Services, Law, Technology Transformation
Managed finance, tax and legal operations
Outsourced and managed operations for accounting, tax, legal and technology functions to improve efficiency, compliance and scalability.
Products: EY Managed Services, Law, Tax
Data, analytics and decision intelligence
Data, analytics, forecasting and AI‑enabled decision intelligence to support strategic planning, transactions and operational improvements.
Products: Technology Transformation, EY ai – a Unifying Platform, Transactions and Corporate Finance by EY-Parthenon
Innovation and immersive collaboration
Facilitated innovation workshops, design sprints and immersive collaboration environments to accelerate strategy, product and operating model innovation.
Products: EY wavespace, EY ai – a Unifying Platform, Strategy by EY-Parthenon
Corporate strategy and growth advisory
Corporate growth, commercial and geopolitical strategy, turnaround and working capital advisory to drive long‑term value creation.
Products: Strategy by EY-Parthenon, Transactions and Corporate Finance by EY-Parthenon, EY wavespace
More information about our offering
Strategy by EY-Parthenon
Strategy by EY-Parthenon blends EY-Parthenon strategy capabilities with EY's global resources to help clients with corporate growth, geopolitical strategy, commercial strategy, working capital advisory, and turnaround planning.
- Craft Custom Growth PlansCreate tailored strategies that identify new markets, customer segments, and expansion opportunities.
- Enable Sustainable GrowthRedesign organizational structures and processes to foster a culture of growth and resilience.
- Optimize Revenue GrowthLeveraging targeted commercial strategies to enhance pricing models and market entry tactics.
- Revive Distressed BusinessesImplement effective turnaround strategies that restore profitability and operational efficiency.
- Assess Global RisksIncorporate geopolitical factors into strategies to mitigate risks and capitalize on emerging trends.
- Enhance Cash Flow ManagementProvide strategies that optimize financial liquidity to support business operations.
Transactions and Corporate Finance by EY-Parthenon
Integrated transactions and corporate finance services including M&A advisory, M&A integration, AI-enabled technology, divestment strategy, corporate finance, valuation modeling, and due diligence.
- Guide M&A ProcessesProvide in-depth insights and strategies that enhance decision-making during mergers and acquisitions.
- Conduct Thorough ReviewsPerform detailed analyses to uncover potential liabilities and ensure informed investment decisions.
- Ensure Successful IntegrationFacilitate seamless integration of acquired entities to optimize value creation post-transaction.
- Leverage AI InsightsUtilize advanced technology to enhance transactional analysis and insights, improving strategic decisions.
- Optimize Asset SalesCraft comprehensive divestment strategies that maximize returns and minimize risks.
- Accurate Financial AssessmentsDeliver precise valuations and robust financial models to support optimal investment choices.
- Anticipate Market ChangesDevelop forecasts and scenarios that guide strategic planning and risk management.
- Unlock Data PotentialTransform data into insights that inform strategic decisions and improve operational efficiency.
M&A Advisory and Integration
Comprehensive M&A advisory services supporting deal origination, evaluation, post-merger integration, and strategic decision-making throughout the M&A lifecycle.
- Facilitates Successful AcquisitionsOffers comprehensive support for clients through every stage of the acquisition process.
- Minimizes Acquisition RisksOffers in-depth assessments to uncover potential risks, providing clarity during acquisitions.
- Capture Significant SynergiesImplement robust governance structures to enhance the financial performance of the merged entities.
- Enhances Decision-MakingAnalyzes potential deals to ensure alignment with business objectives.
- Develop A Comprehensive PlanCreate a detailed integration roadmap that aligns with strategic goals, ensuring effective integration of the merger.
- Promote Cultural IntegrationFocus on aligning corporate cultures to foster collaboration and improve overall morale.
- Enhance Integration EfficiencyUtilize specialized technology to ensure alignment and synergy between merged entities.
- Facilitate Change ManagementEmploy techniques to navigate challenges and engage stakeholders during the integration process.
- Establish Key Performance IndicatorsDefine and track critical KPIs to measure integration success, allowing for adjustments based on real-time data.
Due Diligence Services
Due diligence services providing financial, commercial, and operational insights for transactions.
- Conduct Financial AnalysisPerform a thorough examination of financial statements and projections to identify risks and opportunities.
- Evaluate Market ViabilityAssess the market landscape and competitive positioning to support strategic decisions.
- Analyze Operational EfficiencyEvaluate operational capabilities and integration challenges for seamless transitions.
- Ensure ComplianceAssess adherence to regulatory requirements to mitigate legal risks in transactions.
- Facilitate IntegrationProvide plans outlining integration processes for successful mergers.
EY wavespace
EY wavespace is a global collaboration platform enabling immersive strategy and innovation workshops. It provides a unique space and structured methodology for organizations to accelerate their innovation processes and tackle complex challenges effectively.
- Access Global LocationsConnect with teams around the world to leverage diverse insights and expertise.
- Engage in Experiential WorkshopsExperience hands-on, interactive workshops designed to spur creativity and drive strategic outcomes.
- Streamline Innovation ProcessesUtilize proven frameworks, tools, and techniques to enhance ideation and decision-making.
- Leverage Cutting-Edge TechnologyUtilize the latest tools and technology to enhance collaboration and insights during workshops.
EY ai – a Unifying Platform
EY ai platform unifies EY's AI capabilities across services to accelerate insights and automation. It provides a cohesive framework that integrates various AI tools and technologies to enhance decision-making and operational efficiency across client engagements.
- Integrate AI Across ServicesBring together various AI capabilities under a single platform for seamless functionality.
- Accelerate AI ImplementationFacilitate quicker integration of AI solutions within diverse service lines.
- Deliver Personalized InsightsProvide clients with bespoke AI-driven insights designed for their unique requirements.
- Enhance Decision-MakingLeverage advanced data analytics to inform strategy and operations.
- Foster Innovative SolutionsEncourage teamwork and shared creativity among various professional teams.
EY Managed Services
Managed services offering across cybersecurity, financial accounting, legal, risk, tax, and technology.
- Optimize Technology UseEnhance business performance and reduce IT burdens.
- Enhance Security PostureImplement robust security measures tailored to protect organizations from cyber threats.
- Strengthen Risk ManagementIdentify, assess, and mitigate risks effectively.
- Improve Financial TransparencyDeliver accurate financial information that enhances compliance.
- Facilitate Tax ComplianceEnsure adherence to tax regulations while optimizing tax liabilities.
- Achieve Legal EfficiencyStreamline legal processes and reduce costs.
EY Sustainability
Sustainability services including climate change, sustainable finance, ESG strategy, and supply chain transformation.
- Enhance Environmental ResilienceProvide clients with strategies to manage climate risks and improve sustainability practices.
- Develop Comprehensive ESG StrategiesAssist clients in developing strategies that align with ESG principles.
- Optimize Supply Chain EfficiencyEnsure supply chain processes are sustainable and efficient.
- Facilitate Sustainable InvestmentsSupport clients in identifying sustainable investment opportunities.
- Accelerate Renewable Energy AdoptionGuide clients in transitioning to renewable energy sources, enhancing sustainability.
- Ensure Compliance & SafetyProvide solutions to ensure environmental compliance.
Assurance Services
Audit and assurance services including climate change, financial accounting advisory, forensic & integrity services, and technology risk.
- Ensure Accuracy In ReportingConfirm the fairness and compliance of financial statements.
- Support Sustainable PracticesEvaluate and enhance sustainability reporting.
- Optimize Financial ProcessesGuide clients on financial reporting standards.
- Mitigate Fraud RisksInvestigate and prevent fraud.
- Secure IT Business OperationsAssess technology-related risks.
- Ensure Confidentiality And AccuracyProvide tailored audit solutions for individual clients.
Tax
Tax services including planning, function operations, policy and controversy, global trade, and compliance.
- Ensure Regulatory AdherenceStay ahead with compliance strategies.
- Streamline Internal OperationsEnhance functionality of tax operations.
- Optimize Tax StrategyStrategically plan tax activities.
- Enhance Trade EfficiencyAccess insights to optimize global trade strategies.
- Evaluate Transaction ImpactAssess tax implications during M&A.
- Navigate Tax IssuesManage tax policy matters.
- Incorporate Sustainable PracticesAlign tax strategies with sustainability.
Law
Legal services including corporate and commercial law, digital law, labor and employment law, legal operations, and transaction law.
- Provides Legal Expertise For BusinessOffers comprehensive legal services.
- Facilitates Smooth TransactionsProvides necessary legal due diligence for mergers and acquisitions.
- Ensures Compliance In Digital VenturesAdvises on legal frameworks governing online transactions.
- Guides Employers On Labor LawsHelps ensure compliance with employment regulations.
- Streamlines Legal ProcessesEnhances efficiency through effective management of legal workflows.
Technology Transformation
Technology transformation services to modernize IT, data, analytics, and digital capabilities.
- Enhance Decision MakingUtilize analytics for more informed strategic decisions.
- Optimize M&A ProcessesUse AI to drive efficiency in M&A.
- Unify Transformation EffortsCentralize all transformation activities for enhanced coordination.
- Streamline AuditsLeverage innovative technologies to enhance accuracy.
- Simplify Tax ManagementImplement solutions that streamline tax reporting.
Sources
Methodology and sourcing behind the figures and links shown above.
Audit and assurance
Multiple market reports show a range for global audit/auditing and assurance services from about USD 70B to ~243B. Major industry reports (Fortune Business Insights, Zion) place the market around USD 234–243B with CAGR ~4.2%. MRFR reports a lower USD 160B figure and DataHorizzon reports a narrower USD 70.3B. I used the consensus of the larger published estimates (Fortune, Zion) and rounded to USD 230B with a CAGR of 4.2% as the most representative market-size and growth estimate.
- The global auditing services market size was valued at USD 233.95 billion in 2025
- the global Auditing Services Market size was valued at USD 243.45 Billion in 2023
- the Audit and Assurance Services Market was estimated at 160.0 USD Billion in 2024
- the global audit and assurance services market was valued at USD 70.3 billion in 2024
Sustainability and ESG advisory
Estimate based on multiple market reports in the provided results covering ESG/advisory and sustainability consulting. Several specialist ESG-advisory reports cluster around USD 14–17 billion in the mid-2020s and project high near-term growth (≈24–27% CAGR); broader sustainability consulting estimates are larger with lower CAGRs. I selected a mid-point market size (USD 15 billion) aligned with ESG-advisory-specific reports and a growth potential of 25% CAGR supported by multiple ESG-advisory forecasts reflecting regulatory and investor-driven demand.
- The global ESG advisory market ... worth $14,200.5 million in 2023; projected to reach $59,587.9 million by 2030; CAGR of 25.0% (2024–2030).
- The global ESG advisory market size was valued at USD 14.89 billion in 2024, growing at a CAGR of 24.80% from 2025–2034.
- Market Size 2024 USD 17,034 Million; Sustainability Consulting And ESG Advisory Services Market, CAGR 26.88%.
- Global sustainability consulting market set to expand from $12.37 billion in 2024 to nearly $30 billion in 2030, with a CAGR of approximately 16%.
- The ESG and sustainability advisory market crossed a valuation of USD 43.2 billion in 2025; CAGR (2026–2036) 6.4%.
M&A advisory and integration
Estimated total for “M&A advisory and integration” combines an explicit M&A advisory market figure (USD ~29.3B in 2026) with a separate post‑merger/integration consulting market figure (USD 5.2B in 2024). I summed the available market size numbers (29.29B + 5.2B ≈ 34.5B). For growth potential I weighted the reported CAGRs (advisory 2.5% midpoint 2026–2035; integration ~6.3%) by relative market size to produce a blended CAGR ≈ 3.1%.
Tax advisory and compliance
Synthesis of multiple market reports for tax advisory/consultancy indicates a current global market in the mid-$40B range (2024–2026). Reported CAGRs cluster in the mid-single digits (≈5.6%–6.4%); I estimate a representative CAGR of ~6.0% for the combined advisory and compliance segment.
Risk, compliance and forensic services
Estimated global market size ~USD 18.9B (2024 baseline) and a growth potential ~6.5% CAGR. Rationale: published forensic/forensic-accounting reports in the search results show 2024–2025 market values ranging roughly USD 7.2B–18.9B and CAGRs between ~3.9%–7.7%. I weighted recent specialist reports (Zion, Credence) higher and reconciled lower estimates (MRFR, Fortune, WiseGuy) to produce a mid-to-upper estimate consistent with majority CAGR indications (~6–7%).
- Forensic Accounting Services Market Size 2024 USD 16523 million; CAGR 6.5%.
- global forensic accounting services market size was worth around USD 18.85 Billion in 2024; CAGR 6.89%.
- 2024 Market Size $ 8.5 Billion; CAGR 3.94% (2025-2035).
- Market Size 2024 7.18 (USD Billion); projected CAGR 5.1% (2026-2035).
- The global forensic accounting market size was valued at USD 7.71 billion in 2025; CAGR (2025–2034) 7.02%.
Managed finance, tax and legal operations
Estimate based on combining cited tax-management and legal-managed-services markets while avoiding double-counting software-only figures. MarketsandMarkets estimates the global tax management market at USD 24.52B (2025). Independent research reports value legal managed services at about USD 15.18B (2025). Summing these gives ~USD 39.7B (~USD 40B), with legal-operations software numbers treated as overlapping with managed legal services and therefore not fully additive. Growth potential (CAGR ~8.5%) is the midpoint/weighted blend of the cited growth rates for tax management (~6.3%), legal managed services (~8.7%), and higher-growth legal-operations software (~14.8%), reflecting a services-plus-software managed-operations market accelerated by AI and automation adoption.
- The global tax management market is set for substantial growth, with estimates showing an increase from USD 24.52 billion in 2025 to USD 33.21 billion by 2030, at a CAGR of 6.3%.
- The Legal Managed Services Market was valued at USD 15.18 Billion in 2025 and is projected to grow, with a CAGR of 8.7% (2026–2035).
- The Legal Operations Software Market Size was estimated at USD 19.68 Billion in 2025 and is projected to grow at a CAGR of 14.78% (2025–2035).
- In my experience, the Tax Managed Services market is approaching $1B - and more importantly, it’s accelerating.
Data, analytics and decision intelligence
Multiple market reports in the searchResults report mid‑2020s market sizes between about USD 13.3B and USD 16.8B and forecast rapid expansion (to USD ~50–68B) with CAGRs in the ~15–30% range. I therefore estimate a current market size of about USD 15.5 billion and a representative growth potential of ~20% CAGR as a midpoint of reported forecasts.
- The global decision intelligence market size was valued at USD 16.79 billion in 2024.
- Market size estimated at USD 13.3 billion in 2024; projected to reach USD 50.1 billion by 2030 (CAGR 24.7%).
- Decision intelligence market size is USD 16.34 billion in 2025; CAGR 15.36% (2026–2035).
- Market size expected to grow by USD 49,839.6 million from 2026–2030, expanding at a CAGR of 29.8%.
Innovation and immersive collaboration
Estimate uses the Visual Collaboration Platform market as the closest direct comparator (USD 1.17B in 2026, CAGR ~17.8%). Broader immersive/enterprise XR market reports show a much larger TAM and higher growth ranges (16.8–21.5%+), supporting strong growth potential for innovation-focused immersive collaboration services and workshops within that niche.
- The global Visual Collaboration Platform Market is estimated to be valued at USD 1.17 Billion in 2026.
- The market is projected to reach USD 5.09 Billion by 2035, expanding at a CAGR of 17.79% from 2026 to 2035.
- 2024 Market Size $8.96 Billion; CAGR (2025 - 2035) 21.52%.
- The global immersive technologies market size was valued at USD 38.14 billion in 2025 and is projected to grow at a CAGR of 16.8% (2026-2033).
Corporate strategy and growth advisory
Primary estimate uses a corporate-strategy–specific report (BusinessResearchInsights) that puts the corporate strategy market at USD 14.13B (2026) with an 8.5% CAGR to 2035. Broader strategy/strategic consulting reports (Credence, Fortune, MRFR) show larger total strategy consulting markets (roughly USD 45B–78B) with CAGRs in the ~5–6% range, indicating corporate strategy and growth advisory is a distinct subset of the wider strategy consulting market and may grow faster than the overall segment.
- The global corporate strategy market size is anticipated to be worth USD 14.13 Billion in 2026 and is expected to reach USD 29.44 Billion by 2035 at a CAGR of 8.5%.
- Global Strategy Consulting market reached USD 45,603.0 million in 2024; projected to reach USD 71,967.2 million by 2032 at a CAGR of 5.89%.
- The global strategic consulting market size was valued at USD 78.35 billion in 2025; projected to USD 125.24 billion by 2034 at a CAGR of 5.35%.
- Strategy Consulting Market estimated at USD 51.28 Billion in 2024; projected to USD 94.38 Billion by 2035 at a CAGR of 5.7%.
- EY
- Strategy by EY-Parthenon
- Transactions and Corporate Finance by EY-Parthenon
- Due Diligence Services
- EY wavespace
- EY ai – a Unifying Platform
- EY Managed Services
- EY Sustainability
- Assurance Services
- Tax
- Law
- Technology Transformation
- The global auditing services market size was valued at USD 233.95 billion in 2025
- the global Auditing Services Market size was valued at USD 243.45 Billion in 2023
- the Audit and Assurance Services Market was estimated at 160.0 USD Billion in 2024
- the global audit and assurance services market was valued at USD 70.3 billion in 2024
- The global ESG advisory market ... worth $14,200.5 million in 2023; projected to reach $59,587.9 million by 2030; CAGR of 25.0% (2024–2030).
- The global ESG advisory market size was valued at USD 14.89 billion in 2024, growing at a CAGR of 24.80% from 2025–2034.
- Market Size 2024 USD 17,034 Million; Sustainability Consulting And ESG Advisory Services Market, CAGR 26.88%.
- Global sustainability consulting market set to expand from $12.37 billion in 2024 to nearly $30 billion in 2030, with a CAGR of approximately 16%.
- The ESG and sustainability advisory market crossed a valuation of USD 43.2 billion in 2025; CAGR (2026–2036) 6.4%.
- The Mergers And Acquisitions Advisory Market globally is expected to be valued at USD 29.29 Billion in 2026.
- Market Size (2024): 5.2 billion USD · Forecast (2033): 8.9 billion USD · CAGR: 6.3%
- 2024 Market Size $ 42.51 Billion; CAGR 6.36%
- Market size estimated at USD 46434.26 million in 2026; projected growth CAGR 5.7%
- Cross-Border Tax Service Market Size was valued at 6.57 USD Billion in 2024; CAGR 5.6%
- Forensic Accounting Services Market Size 2024 USD 16523 million; CAGR 6.5%.
- global forensic accounting services market size was worth around USD 18.85 Billion in 2024; CAGR 6.89%.
- 2024 Market Size $ 8.5 Billion; CAGR 3.94% (2025-2035).
- Market Size 2024 7.18 (USD Billion); projected CAGR 5.1% (2026-2035).
- The global forensic accounting market size was valued at USD 7.71 billion in 2025; CAGR (2025–2034) 7.02%.
- The global tax management market is set for substantial growth, with estimates showing an increase from USD 24.52 billion in 2025 to USD 33.21 billion by 2030, at a CAGR of 6.3%.
- The Legal Managed Services Market was valued at USD 15.18 Billion in 2025 and is projected to grow, with a CAGR of 8.7% (2026–2035).
- The Legal Operations Software Market Size was estimated at USD 19.68 Billion in 2025 and is projected to grow at a CAGR of 14.78% (2025–2035).
- In my experience, the Tax Managed Services market is approaching $1B - and more importantly, it’s accelerating.
- The global decision intelligence market size was valued at USD 16.79 billion in 2024.
- Market size estimated at USD 13.3 billion in 2024; projected to reach USD 50.1 billion by 2030 (CAGR 24.7%).
- Decision intelligence market size is USD 16.34 billion in 2025; CAGR 15.36% (2026–2035).
- Market size expected to grow by USD 49,839.6 million from 2026–2030, expanding at a CAGR of 29.8%.
- The global Visual Collaboration Platform Market is estimated to be valued at USD 1.17 Billion in 2026.
- 2024 Market Size $8.96 Billion; CAGR (2025 - 2035) 21.52%.
- The global immersive technologies market size was valued at USD 38.14 billion in 2025 and is projected to grow at a CAGR of 16.8% (2026-2033).
- The global corporate strategy market size is anticipated to be worth USD 14.13 Billion in 2026 and is expected to reach USD 29.44 Billion by 2035 at a CAGR of 8.5%.
- Global Strategy Consulting market reached USD 45,603.0 million in 2024; projected to reach USD 71,967.2 million by 2032 at a CAGR of 5.89%.
- The global strategic consulting market size was valued at USD 78.35 billion in 2025; projected to USD 125.24 billion by 2034 at a CAGR of 5.35%.
- Strategy Consulting Market estimated at USD 51.28 Billion in 2024; projected to USD 94.38 Billion by 2035 at a CAGR of 5.7%.
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