What Is the Big Four in Private Equity?
The term Big Four refers to four of the world's largest professional-services networks: Deloitte, PricewaterhouseCoopers (PwC), Ernst & Young (EY), and KPMG.
Their businesses extend well beyond traditional accounting. Depending on the firm and jurisdiction, services can include audit, tax, consulting, transaction advisory, valuation, risk, technology and other professional services.
In private equity, these firms can become involved because PE transactions are complex. Investors may need help understanding a target company's financial position, tax exposure, operational performance, technology, regulatory environment or other aspects of a potential investment.
This means the Big Four can become important participants in the private-equity ecosystem even though they are not themselves private equity sponsors.
The Big Four generally advise on private equity transactions; private equity firms generally invest the capital.
Who Are the Big Four?
The four firms commonly referred to as the Big Four are:
Collectively, these firms have a significant presence across global business and financial markets.
Their private-equity practices can work with sponsors, portfolio companies, lenders, management teams and other transaction participants.
Are the Big Four Private Equity Firms?
No. This is the most important distinction to understand.
A private equity firm generally raises investment capital from investors and uses that capital to acquire or invest in companies with the objective of generating returns.
The Big Four, by contrast, are professional-services organisations. Their private-equity practices generally provide expertise and advisory services to participants in the investment process.
For example, a private equity sponsor might be evaluating an acquisition. It could engage an advisory team to analyse the target's financial information before the transaction closes.
The sponsor is the investor.
The adviser is helping the investor understand the opportunity and its risks.
Investor and adviser are different roles.
A PE sponsor deploys investment capital. A Big Four firm may provide specialist analysis, advice and transaction support. One transaction can involve both.
What Does Deloitte Do in Private Equity?
Deloitte has a dedicated private equity practice and works with private equity leaders and portfolio-company management teams across the PE lifecycle.
Depending on the engagement, Deloitte can provide services connected with transactions, strategy, operational improvement, technology, risk and other areas relevant to private equity investors.
For a PE investor, this type of external expertise can help turn large amounts of company information into a more structured view of a potential investment.
Deloitte also publishes research and market perspectives covering private equity activity. This can be useful to investors tracking broader market trends in addition to individual transactions.
Importantly, using Deloitte as an adviser does not mean Deloitte owns the private equity investment. The firm's role depends on the specific engagement.
What Does PwC Do in Private Equity?
PwC has a major deals and private-equity advisory presence, supporting investors and companies across different stages of transactions.
Its work can include transaction services, financial due diligence, tax, deals strategy, valuation and other advisory capabilities.
Private equity investors can use these services when assessing a target company, planning an acquisition, executing a transaction or working on value creation after an acquisition.
PwC's deals practice also illustrates how professional services have become closely integrated with modern private-market transactions.
A complex PE transaction can require specialists across financial, tax, operational and strategic disciplines, rather than a single generalist adviser.
What Does EY Do in Private Equity?
EY provides professional and advisory services across areas relevant to private equity investors and portfolio companies.
Depending on the engagement and jurisdiction, these capabilities can include transaction support, strategy, tax, valuation, consulting, risk and technology-related services.
PE firms may use specialist advisers when they need additional expertise to assess a company or execute a transaction.
EY can therefore appear in the ecosystem surrounding private equity deals even though it is not itself a traditional PE sponsor.
What Does KPMG Do in Private Equity?
KPMG provides audit, tax and advisory services, with dedicated capabilities serving private equity investors and portfolio companies.
Its private-equity-related work can cover areas such as transaction services, tax, financial analysis, operational improvement and other advisory requirements.
KPMG also produces research tracking private equity investment activity, deal volumes, exits and broader market developments.
For investors conducting market research, this type of industry intelligence can provide useful context around changes in PE activity.
What Do the Big Four Do for Private Equity?
The exact services vary by transaction, but the Big Four can support private equity investors in several important areas.
- Financial due diligence
- Tax due diligence and structuring
- Valuation
- Transaction advisory
- Operational improvement
- Technology and digital transformation
- Risk management
- Strategy and commercial analysis
- Portfolio-company support
Not every PE transaction requires every service. The scope depends on the target company, investment thesis, transaction structure, geography, industry and specific risks being evaluated.
Why Is Due Diligence Important in Private Equity?
Due diligence is one of the most important areas where professional advisers can support private equity investors.
Before committing capital to an acquisition, investors need to understand what they are actually buying.
A target company may appear attractive based on revenue, market position or headline growth. Deeper analysis can reveal additional information about customer concentration, margins, working capital, cash flow, liabilities or other factors.
Financial due diligence is therefore designed to provide investors with a more detailed understanding of the financial characteristics of a business.
Other forms of diligence can examine legal, commercial, operational, tax, technology and regulatory issues.
Private equity research becomes more valuable when the headline opportunity is tested against the underlying business.
How the Big Four Support PE Transactions
Private equity transactions can involve multiple stages, and advisory work can appear throughout the process.
Before the Deal
Advisers may help evaluate the target company, analyse financial information, assess tax considerations and identify risks that could affect the investment thesis.
During the Deal
Advisers may support transaction execution, valuation, tax structuring, financial analysis and other technical requirements.
After the Deal
Once an acquisition closes, advisers may continue to support the portfolio company through operational improvement, technology transformation, tax planning, reporting and other initiatives.
How the Big Four Work With Portfolio Companies
The relationship does not necessarily end when a private equity acquisition closes.
Portfolio companies may need additional expertise as they scale, integrate acquisitions, improve processes, adopt new technology or prepare for a future transaction.
Professional-services firms can therefore become part of the wider value-creation ecosystem around a portfolio company.
Depending on the assignment, work may involve financial transformation, technology implementation, operational improvement, tax planning, risk management or strategic projects.
This is one reason private equity investors may maintain relationships with specialist advisory teams across multiple portfolio companies.
Big Four vs Private Equity Firms
The difference becomes clearer when the two types of organisations are placed side by side.
This distinction matters when researching private markets because the name appearing in a transaction announcement does not always represent the investor.
One company may have a PE sponsor, a debt provider, financial adviser, legal adviser, accounting adviser and other professional-service providers involved in the same transaction.
What Services Matter Most to PE Investors?
Different investment strategies require different types of specialist support.
Financial Due Diligence
Helps investors examine the financial performance and quality of earnings of a target business.
Tax Advisory
Can help investors evaluate tax considerations associated with an acquisition, ownership structure or portfolio company.
Valuation
Specialist analysis can support valuation work and financial modelling in relevant situations.
Operational Consulting
Advisers can help identify opportunities to improve processes, technology, organisational structures or operating performance.
Transaction Support
Specialist teams can assist with technical and analytical requirements during complex transactions.
The adviser can be as informative as the transaction.
When researching a private-market deal, identifying the advisers involved can provide another layer of context around the transaction, its complexity and the type of analysis performed.
Why Does the Big Four Matter in Private Equity?
Private equity is built around decisions made with incomplete information.
Investors may have access to management presentations, financial statements, market research and other information, but major transactions can still require specialist analysis.
This is where professional advisers can become valuable.
Their role can help investors investigate specific areas of the business before committing capital or making strategic decisions after an acquisition.
The importance of the Big Four in PE therefore comes less from the idea that these firms are investors and more from their position within the infrastructure surrounding private-market transactions.
What Can Investors Learn From Big Four Involvement?
Investors conducting private-market research can look beyond the headline funding or acquisition announcement.
The advisers associated with a transaction can sometimes form part of a broader research picture.
Useful research questions can include:
- Who is the financial sponsor?
- Who advised the buyer?
- Who advised the seller?
- Which firms performed financial or tax diligence?
- What sector does the transaction involve?
- Which geography is involved?
- Is the company part of an existing portfolio?
- Has the sponsor completed similar transactions?
- Are there recurring relationships between the sponsor and particular advisers?
These questions can reveal relationships that are not obvious from looking at the transaction value alone.
The Big Four Are Part of a Larger PE Ecosystem
Private equity is not made up only of sponsors and portfolio companies.
A typical transaction can involve many different participants, including:
- Private equity sponsors
- Limited partners
- Portfolio companies
- Investment banks
- Commercial and investment lenders
- Legal advisers
- Accounting and advisory firms
- Management consultants
- Valuation specialists
- Technology advisers
- Industry experts
Understanding these relationships can help researchers move from a simple company-level view toward a broader understanding of how capital and expertise move through private markets.
Why Are They Called the Big Four?
The name reflects the dominant global position of these four professional-services networks relative to other large accounting and advisory organisations.
The term is widely used in accounting, auditing, business advisory and financial markets.
The group became known as the Big Four after the number of major global accounting firms contracted over time through mergers and the collapse of Arthur Andersen in the early 2000s.
Today, the phrase is used well beyond traditional accounting because the firms provide a broad range of professional and advisory services.
Why the Big Four Matter for Private Equity Careers
The relationship between professional services and private equity also matters to finance professionals building careers in the industry.
Professionals can gain exposure to transactions through areas such as audit, transaction services, deals, tax, valuation, consulting and financial analysis.
This can create a connection between professional-services careers and the broader private-capital ecosystem.
However, working at a Big Four firm and working for a private equity sponsor are different career paths, with different responsibilities, compensation structures, investment roles and day-to-day work.
How to Research Big Four Private Equity Activity
If your goal is to understand private-market activity, researching the Big Four can be more useful when you connect firms to actual transactions and relationships.
Start with the transaction itself.
Then identify the sponsor, target company, advisers, sector, geography and transaction type.
From there, researchers can examine whether the same investors or advisers appear across multiple transactions.
This can help reveal patterns that are difficult to see when researching companies individually.
The InveLedger Perspective
Private equity becomes more interesting when individual transactions are viewed as connected pieces of a larger investment network.
A PE acquisition is not simply a buyer purchasing a company. It can connect an investor, target, advisers, lenders, executives, sectors, locations and future transactions.
The Big Four can be one part of that network.
For example, a researcher may discover that a particular private equity sponsor repeatedly works with certain advisers across transactions or that particular advisers appear frequently within a specific sector.
Those relationships can become useful signals when conducting broader private-market research.
InveLedger is designed around this broader investment-intelligence approach: connecting companies, investors, funding activity and market relationships to help researchers see more of the picture behind private capital.
The most valuable private-market insight is often found between the entities, not just inside them.
Key Takeaways
The phrase "Big Four in private equity" can be confusing because it sounds like it refers to four investment firms. It does not.
- The Big Four are Deloitte, PwC, EY and KPMG.
- They are major professional-services networks rather than traditional private equity sponsors.
- They can provide financial, tax, transaction, valuation, consulting and other advisory services.
- Private equity firms may hire Big Four teams during acquisitions and other transactions.
- Big Four firms can also support portfolio companies after an acquisition.
- The distinction between investor and adviser is important when researching private-market transactions.
- Adviser relationships can form part of a broader investment-intelligence picture.
Frequently Asked Questions
The Big Four refers to Deloitte, PwC, EY and KPMG. They are major global professional- services networks that provide services such as audit, tax, consulting, valuation and transaction-related advisory. In private equity, they can advise investors and portfolio companies on various aspects of transactions and operations.
No. The Big Four are professional-services networks, not a group of four private equity firms. Private equity sponsors generally invest capital into companies, while Big Four firms commonly provide professional and advisory services around transactions and portfolio companies.
The four firms are Deloitte, Pricewaterhouse- Coopers (PwC), Ernst & Young (EY), and KPMG.
Depending on the engagement, Big Four teams can provide financial due diligence, tax advice, valuation, transaction support, strategy, technology consulting, risk services and portfolio-company support.
Yes. Private equity sponsors may engage Big Four teams for specific transactions, portfolio-company projects and specialist advisory requirements. The exact adviser depends on the transaction and services required.
Private equity firms generally raise and deploy investment capital into companies. Big Four firms primarily provide professional and advisory services. A PE firm can engage a Big Four firm to support a transaction or portfolio company.
Big Four firms can provide specialist expertise that helps investors analyse, execute and manage complex transactions. Their involvement can also provide useful context when researching relationships across the private-market ecosystem.
Sources and Further Reading
This article is intended as a general educational explanation of the Big Four and their role in the private equity ecosystem.
Current private equity activity, advisory mandates and transaction relationships can change over time. Readers conducting professional investment research should verify individual transactions, company announcements, regulatory filings and adviser disclosures against primary sources where available.
InveLedger uses this broader relationship-based perspective to help researchers explore companies, investors, transactions and the networks surrounding private-market activity.
See the relationships behind private markets.
Explore companies, investors, funding activity and the relationships behind private-market capital flows with InveLedger.
info@inveledger.comThis article is provided for general informational and educational purposes and does not constitute investment, financial, legal or tax advice. Private-market investments involve substantial risks, including possible loss of capital and illiquidity. Information about advisers, transactions and private companies can change and should be independently verified before being used for investment decisions.