Which is the largest IT service company in the world?

Accenture is the largest IT service company in the world by revenue. It reported revenue of $74.2 billion for the fiscal year ended 31 August 2026, with about 814,000 people. IBM has similar total revenue but most of it comes from software and hardware. Among pure IT services firms, Tata Consultancy Services is second, at just over $30 billion.

Key takeaways

• By revenue, Accenture leads with $74.2 billion (fiscal 2026) and is more than twice the size of TCS.
• TCS is the largest India-based IT services company, with over $30 billion in revenue and 584,519 employees in its year to March 2026.
• IBM's total revenue was $67.5 billion in 2025, but consulting is only one of its segments, so it is not a like-for-like comparison.
• Rankings change with the measure you choose: revenue, headcount and market value give different orders.
• Size alone says little about fit. Mid-sized buyers often get more senior attention from specialist providers.

The largest IT services companies by revenue

The table below uses each company's own latest full-year results. Fiscal years end in different months, and three report in currencies other than US dollars, so treat close positions as approximate.

Sources: Accenture fiscal 2026 results, IBM fourth-quarter 2025 results, TCS FY26 results filing (NSE), Capgemini full-year 2025 results, Cognizant full-year 2025 results, Infosys FY26 results release and HCLTech FY26 results.

Two large groups are left out of the table on purpose. Deloitte and the other Big Four firms report revenue that includes audit, tax and advisory work, so their technology services share is not separately comparable. Japan's NTT DATA is also one of the biggest IT services providers worldwide, but it reports in yen on a different basis.

Why Accenture ranks first

Accenture is the largest IT services company on revenue because it combines consulting, technology implementation and long-term managed services at very large scale. Its fiscal 2026 revenue grew 6% in US dollars, and it booked $84.5 billion of new work in the year.

Its scale comes from breadth. It works across almost every industry and region, runs large outsourcing contracts and has grown through a steady stream of acquisitions. That breadth is also why it appears on most large-enterprise shortlists for multi-year transformation programmes.

Is IBM bigger than Accenture?

Not in IT services. IBM's total 2025 revenue of $67.5 billion is close to Accenture's, but it is split across software, infrastructure (hardware such as mainframes) and consulting. In 2025 IBM's consulting revenue grew 2%, while software grew 11% and infrastructure 12%. On services alone, IBM is well behind Accenture.

The largest Indian IT services companies

India is home to three of the seven companies in the table. TCS is the biggest, followed by Infosys and HCLTech. All three run global delivery models, with large engineering centres in India serving clients in North America, Europe and the rest of Asia.

• TCS: revenue of ₹267,021 crore in FY26, which TCS states as over $30 billion; 584,519 employees.
• Infosys: $20,158 million in FY26 revenue, up 3.1% in constant currency.
• HCLTech: $14.7 billion in FY26 revenue, up 3.9% in constant currency.

Revenue, headcount or market value: which measure matters?

Each measure answers a different question. Pick the one that matches why you are asking.

Older lists, including earlier versions of this article, ranked firms by market value at a single date. Those figures go out of date quickly, which is why this page uses reported annual revenue.

Does the biggest provider make the best partner?

For a global enterprise running a multi-country programme, scale matters: these firms can staff hundreds of people across time zones. For a mid-sized company, the trade-offs look different.

• Attention: a contract that is large for you may be small for a global firm. Ask who your day-to-day team will be.
• Seniority: specialist providers often put senior engineers directly on the account.
• Flexibility: smaller firms usually accept shorter contracts and narrower scopes.
• Breadth: large firms cover more technologies and regions under one contract.

Our guides on how to choose an IT support company and the best managed IT service providers go through selection criteria in more detail.

Where Opsio fits

Opsio, the publisher of this article, is not in the same size bracket as the firms above. We are a specialist cloud and managed IT services provider and an AWS Advanced Tier Services Partner, with offices in Karlstad, Sweden, and Bangalore, India. We focus on cloud operations, migration, security and DevOps for mid-sized companies in the Nordics, Europe and India. See why companies choose Opsio.

Frequently asked questions

Which is the largest IT service company in the world?

Accenture, with $74.2 billion in revenue for its fiscal year ended 31 August 2026 and about 814,000 people. It is the largest by revenue among companies whose main business is IT services.

Which is the largest IT company in India?

Tata Consultancy Services (TCS). It reported revenue of over $30 billion for the year to 31 March 2026 and had 584,519 employees at year end.

Is TCS bigger than Accenture?

No. Accenture's annual revenue is more than twice that of TCS, and it has more employees. TCS is, however, the largest India-headquartered IT services company.

Which IT services company has the most employees?

Among the companies in this article, Accenture has the most, at about 814,000, followed by TCS at 584,519 and Capgemini at 423,400.

Which is the largest IT services company in Europe?

Capgemini, headquartered in Paris, is the largest Europe-based company in this list, with €22.5 billion in 2025 revenue and 423,400 people. Accenture is incorporated in Ireland but operates as a global company with most of its revenue outside Europe.