In 2024, Deloitte roughly 21 billion U.S. dollars in revenue from its assurance segment, making it the leader in the assurance market among the Big Four. The Big Four worldwide The Big Four consist of PricewaterhouseCoopers (PwC), Deloitte, Ernst & Young (EY), and KPMG. These companies are the four largest accounting and audit firms worldwide. In 2024, they brought in more than 212 billion U.S. dollars in global combined revenue. Out of the four, Deloitte had the highest number of employees. Second in the list was Ernst & Young, followed by PwC, and KPMG. The majority of revenue generated by Deloitte came from the Americas region, as was the case with PwC and EY. The Big Four in the U.S. These four companies have the most influence in the accounting and audit sector in the United States, auditing over 80 percent of U.S. public companies. Out of the Big Four, Deloitte brought in the highest gross revenue in the United States. Following Deloitte was PwC, bringing in 22.75 billion U.S. dollars, then Ernst & Young, that brought in 21.46 billion U.S. dollars. KPMG brought in the least, generating 12.2 billion U.S. dollars the same year.

With a total revenue of over 67 billion U.S. dollars, Deloitte was the largest of the Big Four accounting firms in 2024. The combined revenue of the firms increased steadily in the last decade and exceeded 212 billion U.S. dollars in 2024. The Big Four accounting firms The leading accounting firms in the world are Deloitte, PricewaterhouseCoopers (PwC), Ernst & Young (EY), and Klynveld Peat Marwick Goerdeler (KPMG). The firms provide their clients with various professional services that include auditing, corporate finance, and legal advice. Consulting revenue accounted for around 40 percent of Deloitte’s record total in 2024, whereas PwC and EY received most of their revenue from auditing services. International firms with workforces to match When broken down by geographical region, the three biggest firms generated most of their revenue in the Americas region – KPMG’s most lucrative region was its network of firms in Europe, the Middle East, and Africa (including India). The United States has remained a major market for all four firms, where Deloitte generated nearly half of its total revenue in 2024. In terms of the number of employees, the four firms had a combined global workforce of more than one million people, as Deloitte once again led the way in 2024.

The combined global revenue of the Big Four accounting firms reached over 212 billion U.S. dollars in 2024, a significant increase when compared to the previous year. The roughly nine billion U.S. dollar increase between 2023 and 2024 was noteable, however 2022 was the biggest year-on-year growth ever recorded for the Big Four, with an increase in the region of 22 billion U.S. dollars when compared to 2021. Who are the Big Four? The four biggest accounting firms worldwide – also known as audit firms or professional services networks – are Deloitte, PwC, EY, and KPMG. The Big Four hold a dominant share of the industry, but out of the four it was Deloitte that was ranked the leading accounting firm worldwide in 2024, as they generated 67 billion U.S. dollars in revenue. Deloitte was also ranked the leading accounting firm in the United States in 2023, with revenue figures of around 33 billion U.S. dollars. A guide to accounting firms The accountancy profession is part of the tertiary sector of the economy, which focuses solely on providing services to customers; being an accountant requires specialist knowledge and professional experience. There are many different disciplines to the service ranging from simple consultancy to more complex legal issues, but the main focus is to produce detailed financial statements that determine the financial position of a company. Independent firms with strengths in the different branches of accounting have come together under a single brand name – such as Deloitte or PwC – to create professional services networks that can cost-effectively meet the needs of clients.

Deloitte reported total revenue figures of around 67 billion U.S. dollars in 2024, the highest among the Big Four accounting firms. The company also led the rankings in the Americas, but it was PwC who came out on top in the EMEA region (Europe, the Middle East, and Africa). Accounting around the world Deloitte generated 36.4 billion U.S. dollars in North and South America in 2024, which was slightly more than half of their revenue worldwide. A similar story was reported by PwC, with almost half of their aggregated worldwide revenue in 2024 being made in the regions of the Asia Pacific and EMEA. PwC experienced particularly strong growth in EMEA where aggregate revenues in the region increased in recent years. Who are the Big Four? The four biggest accounting firms worldwide are Deloitte, PricewaterhouseCoopers (PwC), Ernst and Young (EY), and Klynveld Peat Marwick Goerdeler (KPMG). Known as the Big Four, the companies have a significant oligopoly in the accounting market and generated a combined revenue worldwide of over 212 billion U.S. dollars and employed over one million people globally in 2024. Until 1989, the market had been dominated by eight accounting firms – also known as audit firms or professional services networks – but the number has since halved due to mergers and the collapse of major American accounting firm Arthur Andersen.

Deloitte generated the largest revenue of the Big Four accounting firms in the United States in 2024, earning approximately 10 billion U.S dollars more than their nearest competitor, PricewaterhouseCoopers (PwC). The ranking mirrored the revenue of the Big Four firms worldwide, as Deloitte and PwC again competed for the top two positions. Deloitte’s operations in the Americas Deloitte reported revenue figures of over 36 billion U.S dollars for the Americas region in 2024, of which approximately 33 billion U.S. dollars came from the United States. In recent years, the performance of Deloitte in the United States improved, with its revenue increasing steadily since 2010. The growing number of employees at Deloitte provides another indication of the firm’s stature throughout North and South America. Deloitte employed roughly 216,000 staff members across the Americas in 2024, the highest number among the leading accounting firms in the United States. The Big Eight of the Eighties There are 4 major accounting firms in the world today: Deloitte, PricewaterhouseCoopers (PwC), Ernst and Young (EY), and Klynveld Peat Marwick Goerdeler (KPMG). However, the professional accounting landscape was far different for much of the 20th century, with 8 firms competing for the same major clients. The growth of multinational clients in a global economy changed the industry during the 1980s. In order to gain a strong foothold in the new international market, 2 mega mergers took place in 1989 that involved 4 of the Big Eight firms: Ernst and Whinney merged with Arthur Young to form Ernst and Young, and Deloitte Haskins and Sells merged with Touche Ross to form Deloitte and Touche. This was the start of the Big Eight gradually being reduced to the Big Four.

This statistic presents the development of revenue for the Big Four audit and tax advisory companies: PricewaterhouseCoopers (PwC), Deloitte, KPMG and Ernst & Young (EY), only for the British lines of business as of 2004 and 2014, listed by service: advisory, audit and tax. In 2014, the British revenue for PwC in the advisory stream reached *** billion British pounds, a figure also reached by Deloitte's advisory services sector in the same year. EY were the only one of these firms to more than double their total revenue over these ten years, although PwC had the greatest increase over these years, increasing their revenue by *** billion British pounds.

In 2024, PricewaterhouseCoopers (PwC) generated around ** percent of its total revenue from the Americas region. The Americas continued to be the most important region in terms of revenue for the firm, generating around **** billion U.S. dollars in 2024. Upward trends continue Growth across all of its geographic regions contributed to PwC generating a gross revenue of over ** billion U.S. dollars in 20234 Helped by strong performances from operations in North America, revenue in the Americas continued on its upward trajectory as figures increased by roughly *** million U.S. dollars between 2023 and 2024. Revenue streams also increased across all three service lines: assurance, advisory, and tax. Helping clients build for the future PwC is a global accounting firm – also known as an audit firm or professional services network – with offices in more than *** countries. The aggregated gross revenue of the company has increased year-on-year since 2006, making it one of the prestigious Big Four accounting and consulting firms. When broken down by industry sector, the firm has generated most of its revenue from clients in financial services. Financial institutions such as banks and insurance companies are continuously seeking advice on topics such as minimizing risk, managing regulatory requirements, and planning for innovations in digital technologies.

PricewaterhouseCoopers (PwC) generated 10.73 billion U.S. dollars from the financial services industry in 2018, around four billion U.S. dollars more than the next ranked industry sector. Income from the financial services industry accounted for around 25 percent of the firm’s aggregated gross revenue worldwide in 2018. What drives demand from financial services? Financial institutions such as banks and insurance companies face frequent changes in their line of work and, consequently, accounting firms can be confident that revenue from this industry generates a significant share of their annual revenue. KPMG – another of the Big Four accounting firms – received around 30 percent of its annual worldwide revenue from the financial services industry in 2019. One obstacle that many financial institutions are having to overcome is how to cope with changes in technology; many companies are seeking professional advice on how to decrease cybersecurity risks or improve the mobile banking experience for their customers. An overview of PwC PwC is an accounting firm – also known as an audit firm or professional services network – with members located around the world. Formed in 1998 as the result of a merger between Price Waterhouse, and Coopers and Lybrand, the firm can trace its roots back to London during the 19th century. PwC is one of the Big Four accounting firms and provides auditing services for many of the world’s most valuable publicly traded companies. In 2019, the firm reported global gross revenue of more than 42 billion U.S. dollars and employed around 276,000 people worldwide.

In 2024, EY generated a record global revenue of approximately 51 billion U.S. dollars. Between 2011 and 2024, the annual revenue of EY grew exponentially. The professional partnership firm saw their highest growth in almost two decades in fiscal year 2022. EY - Global powerhouse Ernst & Young is a global professional services firm and one of the Big Four auditing firms, the others being Deloitte, KPMG and PricewaterhouseCoopers (PwC). The company now abbreviates its name to EY since rebranding in 2013. EY provides several business services including, assurance, advisory, tax, and transaction advisory services. The company is spread globally with operations in Europe, the Middle East, Africa, the Americas, Asia-Pacific and Japan. Since 2010, the revenue of Ernst & Young has continuously grown, increasing nearly twofold in one decade. Employee growth In 2023, EY was the third third largest accounting firm in the world in terms of revenue, following Deloitte and PwC. In the same year the firm also ranked second in terms of employment with approximately 400,000 employees worldwide. The next largest was PwC with approximately 365,000 employees worldwide. Global revenue sources In 2024, EY generated the majority of its revenue in the Americas, grossing approximately 24 billion U.S. dollars. Prior to 2015, Ernst & Young consistently generated its highest revenues in the EMEIA (Europe, Middle East, India and Africa) business region, accumulating over 200 million U.S. dollars more than in the Americas in 2014.

In 2024, Deloitte was the leading accounting firm in the United States, with consulting revenue of around 18 billion U.S. dollars from consulting services. The so-called Big Four continued to lead the industry by some way.

In 2024, EY had a total global workforce of almost 400,000 people. The majority of employees worked in the EMEIA region with a total of roughly 157,000. EY - Global powerhouse Headquartered in London, EY, one of the Big Four accounting firms, operate in over 150 countries worldwide. The firm generated a total revenue of approximately 51 billion U.S. dollars in 2024, a significant growth compared to the previous year. The region with the highest revenue in 2024 was the Americas. The Big Four The Big Four consist of Deloitte, Ernst & Young, PricewaterhouseCoopers, and KPMG. These firms are the biggest auditing and accounting firms in the world that offer various professional services such as assurance, corporate finance, and legal services. They have a significant influence on the auditing sector worldwide. The combined revenue of the Big Four was approximately 204 billion U.S. dollars in 2023. Deloitte has consistently generated the highest amount of revenue, with KPMG bringing in the least out of the four. When broken down by function, advisory and consulting generated the highest revenue across the Big Four in 2023.

The revenue is forecast to experience significant growth in all segments in 2029. Comparing the four different segments for the year 2029, the segment 'Video Streaming (SVoD)' leads the ranking with 572.71 million U.S. dollars. Contrastingly, 'Video Downloads (EST)' is ranked last, with 13.21 million U.S. dollars. Their difference, compared to Video Streaming (SVoD), lies at 559.5 million U.S. dollars. Find other insights concerning similar markets and segments, such as a comparison of number of users in the United Kingdom and a comparison of number of users in the United States. The Statista Market Insights cover a broad range of additional markets.

In 2024, KPMG generated a record revenue of **** billion U.S. dollars. This was an increase of approximately * billion U.S. dollars compared to the previous year. KPMG - additional informationKPMG is one of the leading accounting and audit firms in the world, and has generated more than ** billion U.S. dollars in revenue annually since 2008. The current company was fully established in 1987 with the merging of Peat Marwick International and KPM (Klynveld Main Goerdeler). The firm is among the Big Four audit and accounting firms, alongside Deloitte, PwC (PricewaterhouseCoopers) and EY (Ernst and Young). In terms of revenue, KPMG was the smallest of the Big Four in 2024. In that year, Deloitte had the highest turnover with roughly ** billion U.S. dollars more than KPMG. KPMG has three main service lines – audit, advisory and tax services. Of these services, auditing has generated the most revenue for the company year on year from 2010 to 2017. The advisory services, however, had the largest growth in revenue since 2010, and from 2018 it became the KPMG service generating the largest revenue. When compared to the service revenue of the ‘Big Four’ firms, KPMG generated the third highest revenue in advisory services in 2024, making around *** billion U.S. dollars more than EY.

In 2024, the Big Four accounting firms increased their number of employees. Deloitte increased their workforce by roughly 3,500 between 2023 and 2024. The Big Four - additional information The Big Four are the four global leaders in auditing and accounting. Deloitte, PricewaterhouseCoopers (PwC), Ernst and Young (EY), and KPMG together audit the majority of publicly traded companies worldwide. In 2024, Deloitte employed the largest number of people with a workforce of approximately 460,000 people. Founded in London in 1845 and currently headquartered in New York, the firm had the majority of its workforce in the Americas when broken down by region, closely followed by Europe, the Middle East and Africa. Combined, the Big Four employed more than 1.5 million people worldwide in 2024. Deloitte was the largest auditing firm out of the four in terms of revenue in 2024, with PwC generating approximately 10 billion U.S. dollars less.

In 2024, KPMG generated a record global revenue. Their audit service line alone created a turnover of 13.4 billion U.S. dollars. KPMG worldwide KPMG is a multinational professional services network with headquarters in the Netherlands and the United Kingdom. In 2024, they employed approximately 300,000 people, with the majority located in Europe, the Middle East, Africa and India (EMA). The EMA region also generated the highest share of revenue worldwide for KPMG. Moreover, their presence in the Americas lags behind that of the other Big Four accounting firms, with the gap being lower in other regions. In terms of both revenue and employment, KPMG is the smallest of the Big Four. KPMG services Multinational accountancy and consultancy network KPMG is broadly divided into three main services: audit, advisory and tax. Audit is perhaps the area KPMG (and the other large accountancy firms) are most famous for, consisting of financial statement audits, as well as other forms of company audits, business reporting/analytics and risk assessment. In both the Americas and the Asia Pacific region, this is KPMG’s largest function. The advisory segment includes consulting services, especially management and risk consulting, business strategy and advice on investments. Finally, the tax segment focuses on taxation and legal advice.

The aggregated annual gross revenue of PricewaterhouseCoopers increased steadily from 2006 to 2024. In the fiscal year of 2024, PwC generated approximately 55.4 billion U.S. dollars in aggregated gross revenue. PwC - additional informationPwC is one of the four largest accounting and audit firms in the world. These firms, known collectively as the ‘Big Four’, also include Deloitte, Ernst & Young (EY) and KPMG. PwC was the second largest of the Big Four in terms of revenue in 2024, following Deloitte. PwC has three main service lines – assurance, advisory and tax. In terms of worldwide revenue, assurance is PwC’s largest service line and accounted for roughly 40 percent of the company’s total revenue in 2024. PwC also had the second highest assurance revenue streams of the Big Four firms in 2024. PwC’s tax service business line was the largest of the Big Four, grossing more than 12.5 billion U.S. dollars in 2024. The majority of PwC’s revenue has been generated in the Americas region. In 2024, PwC generated 24.4 billion U.S. dollars there, which accounted for more than 40 percent of the revenue in that year.

Accounting firm PricewaterhouseCoopers (PwC) reported growth across all three of its main service lines in 2024, helping the firm achieve an annual gross revenue of over 55 billion U.S. dollars. PwC generated approximately 19.5 billion U.S. dollars from its assurance services, with the firm’s advisory services generating the highest amount of revenue, increasing by roughly 700 million U.S dollars between 2023 and 2024. Clients preparing for digital transformation The aggregated gross revenue of PwC grew by approximately five billion U.S. dollars between 2021 and 2022, an increase that will see the firm maintain its position as one of the Big Four accounting firms worldwide. The largest share of the firm’s total revenue comes from its assurance service line, but its advisory operations continue to grow year-on-year and increased by around 22 percent in 2022. Clients ranging from small startups to huge multinational companies are all facing the challenge of making sure they have the skillset required to cope with the challenges of the digital world. To help build for the future, an increasing number of clients are seeking advice of accounting firms such as PwC on topics such as data analytics and cybersecurity. Building a professional services network PwC is a brand name under which a network of independent firms from across the world join forces to meet the needs of clients. The member firms of this professional services network operate within an organized framework and can draw upon the resources of other members. Each firm provides expertise in one of the specialist branches of the accountancy profession, be that advising on the latest market trends or discussing the complex legal issues of a merger. The responsibilities of accountants in today’s world are continually evolving, but the core duty is the same independent auditing of financial records that saw the profession gain prominence back in the 19th century.

In 2024, the combined global revenue of accounting firm EY reached over ** billion U.S. dollars. More than ********* of this came from its assurance services. The firm’s tax and assurance service lines had the biggest year-on-year growth, increasing by *** percent respectively between 2023 and 2024. Advisory services help to strengthen EY EY reported growth across three of its four service lines in 2024, which led to the overall global revenue of the firm increasing by around *** billion U.S dollars on the previous year. The firm’s assurance services package – providing clients with support in the areas of auditing and financial accounting – remains a key focus and has generated the most income for a number of years. EY’s consulting line, however, continues to attract strong demand from clients and revenue from the service has more than doubled since 2012. One reason for this could be that developments in digital technology are prompting more and more clients to seek advice on topics such as data analytics and cybersecurity, helping them to build their company for the future. The titans of the accounting world EY is among the Big Four accounting firms worldwide – third after PricewaterhouseCoopers (PwC) and Deloitte in terms of revenue. EY’s record income contributed to the increase in combined revenue of the Big Four. Proposals and recommendations have been discussed in order to break up the market dominance of the four accounting firms and create competition within the sector, but for the time being the Big Four will continue to audit the financial records of the largest public companies worldwide.

All of the service lines offered by Deloitte have ********* in annual revenue for over a decade. The tax and legal line of the firm **** significantly when compared to 2023. This service line generated approximately **** billion U.S. dollars of revenue (out of a total revenue of **** billion U.S. dollars) in 2024. Deloitte’s business units Deloitte Touche Tohmatsu, generally referred to simply as Deloitte, is a global accounting firm operating in over *** countries. Headquartered in New York City, the company provides services across a wide variety of industry groups with around half their revenue being derived from the financial services and consumer business and transportation sectors. Since 2013, Deloitte has been divided into five service lines: audit and assurance, consulting, financial advisory, risk advisory and tax and legal. Prior to this, audit and assurance and risk advisory were combined. The Big Four In terms of total revenue, Deloitte is the largest of the Big Four accounting firms worldwide. The market dominance of Deloitte has largely been down to its presence in the Americas region, where this area of the world accounts for just over half their revenue. When broken down by region, the second largest firm of the Big Four in PwC has a larger share of the market in the EMEA region. PwC has also generated the greatest revenue of the Big Four from tax, audit & risk advisory services, whereas the highest earning service line for Deloitte has consistently been consulting.

Deloitte generated a revenue of approximately **** billion U.S. dollars worldwide in 2024. This was an increase of roughly *** billion U.S. dollars when compared to the previous year. This meant that 2024 was the most profitable fiscal year ever for Deloitte. Deloitte - additional information Between 2009 and 2024, Deloitte’s revenue increased from **** billion U.S. dollars to **** billion U.S. dollars. The consistent revenue growth of the firm allowed Deloitte to become the largest of the Big Four firms. The Big Four also include PwC (PricewaterhouseCoopers), EY (Ernst & Young), and KPMG. PwC was the second largest of these firms in terms of revenue, which grossed around * billion U.S. dollars less than Deloitte. Deloitte operates in over *** countries worldwide in the Americas, Europe, the Middle East and Africa (EMEA), and Asia-Pacific. Every year since 2006, around half of Deloitte’s total revenue was generated in the Americas. In 2023, the firm made almost ** billion U.S. dollars in revenue in the Americas. In the same year, the company’s revenue from the rest of the world combined was **** billion U.S. dollars. Deloitte - business units Deloitte operates four main service lines - audit and enterprise risk services, consulting, tax and financial advisory. The consulting services segment had some of largest revenue growth year on year since 2006. The consulting services line increased its revenues from *** billion U.S. dollars in 2008 to **** billion U.S. dollars in 2023. The second largest revenue share comes from audit and assurance services, generating **** billion U.S. dollars in the same year.