The global market for system integrators is changing rapidly. While top 20 Global System Integrators (GSIs) dominated the market for decades, we’ve recently seen a shift towards more collaborative IT service ecosystems.

Let’s assess the current state of the system integrator market and the implications for emerging regional service providers in the United States and Europe.

What are system integrator companies?

System integrator companies specialize in bringing together component subsystems into a unified, functional whole. These organizations play a critical role in modern business operations by:

• Connecting disparate software and hardware systems

• Ensuring seamless data flow across platforms

• Implementing complex IT infrastructure projects

• Managing large-scale digital transformation initiatives

• Providing ongoing support and maintenance services

As businesses navigate the complexities of cloud migration, AI implementation, and cybersecurity enhancement, system integrators serve as essential partners in bridging technological gaps and maximizing IT investments.

According to recent market analysis, global system integrators (GSIs) account for US$863.8 billion in revenue, or approximately 8.9% of total IT spending worldwide. However, this marks a decline from 9.9% in 2019, indicating shifting market dynamics for integration services we'll explore further.

Global System Integrators List: The Top 20 GSIs

The top 20 global system integrators (GSIs) dominate the market, accounting for 51.9% of all system integration revenue in 2024. These industry giants collectively generated US$448.7 billion in revenue, while all other system integrators combined accounted for US$415.1 billion.

Top 20 Global System Integrators by Total Annual Revenue (2024)

Note: Total Revenue figures are estimates based on total group-level annual revenue publicly available data and market analysis for 2024.

Despite their market dominance, these top 20 GSIs have experienced a declining share of the overall system integration market for five consecutive years. The most successful among them are expanding their managed services divisions, with market leader Accenture reporting an 11% year-on-year increase in managed services revenue—nearly double the growth rate of its consulting business. This shift provides stable revenue streams while enabling integrators to pursue innovative projects in emerging technologies like AI.

The evolving IT system integrators landscape

The system integration market is undergoing substantial transformation driven by:

1. Shifting customer preferences
   - Enterprises now favor specialists with deep expertise in specific technologies or industries rather than generalist providers

2. Value-based service models
   - Traditional time-and-materials pricing is giving way to outcome-based approaches

3. AI acceleration
   - Generative and agentic AI capabilities are becoming key differentiators

4. Increased competition
   - Cloud-native and industry-specialist integrators are gaining market share

Recent data reveals that spending on IT through system integrators reached $863.8 billion in 2024, up from $829.5 billion in 2023. However, the share captured by the top 20 global SIs has decreased from 52.9% to 51.9%, marking the fifth consecutive year of market share decline for these dominant players.

This trend reflects a market favoring agility and specialization, with customers increasingly reluctant to invest without clear ROI. The complexity of large GSI matrix structures can impede their ability to deliver the focused expertise that more specialized competitors offer.

System integrator categories

The broader system integration market features diverse players ranging from multinational consulting firms to specialized technology implementers:

By Service Focus:

• Technology Consulting & Implementation

  • Firms specializing in strategic technology planning and execution

• Managed Service Providers

  • Organizations focused on ongoing operational support and infrastructure management

• Industry-Specific Integrators

  • Companies with deep expertise in particular sectors (healthcare, finance, manufacturing)

• Cloud Transformation Specialists

  • Integrators focused on migrating and optimizing cloud environments

By Size:

• Tier 1 Global Giants

  • Multi-billion dollar firms with global reach (the Top 20 GSIs)

• Mid-Market Regional Leaders

  • Companies with strong presence in specific geographic markets

• Boutique Specialists

  • Smaller firms with deep expertise in niche technologies

Top 10 System Integrator Companies (US HQ)

Based on our top 20 GSIs table, here are the US-headquartered system integrators that rank among the global leaders:

1. Deloitte (#2 globally) - With US$59.5 billion in revenue and 430,000 employees, Deloitte combines strong consulting roots with expanding technology implementation capabilities.

2. IBM Global Services (#3 globally) - Generating US$55.9 billion in revenue with 350,000 employees, IBM leverages deep technical expertise and Watson AI capabilities to deliver comprehensive enterprise solutions.

3. Cognizant (#7 globally) - With US$19.4 billion in revenue and 347,500 employees, Cognizant focuses on healthcare, financial services, and retail verticals with expanding AI capabilities.

4. DXC Technology (#10 globally) - Formed from the merger of CSC and HP Enterprise Services, DXC specializes in mission-critical systems with US$14.4 billion in revenue and 130,000 employees.

5. EPAM Systems (#17 globally) - Specializing in product development, digital platform engineering, and digital consulting, EPAM generates US$6.5 billion in revenue with 55,000 employees.

6. Kyndryl (#18 globally) - Spun off from IBM's infrastructure services business, Kyndryl focuses on managed infrastructure services with US$6.3 billion in revenue and 90,000 employees.

7. Unisys (#20 globally) - With US$5.4 billion in revenue and 16,400 employees, Unisys specializes in security-centric solutions for government and commercial sectors.

Other notable US-based system integrators that, while not in the top 20 GSIs by revenue, play significant roles in the market include:

8. Insight Enterprises - Growing through strategic acquisitions to expand beyond its VAR origins into comprehensive services.

9. CDW - Traditionally hardware-focused, now expanding its services portfolio through acquisitions.

10. Booz Allen Hamilton - Particularly strong in the public sector and defense, with growing commercial practice.

US federal contracting has historically been a reliable revenue source for these firms, with Accenture generating approximately 8% of its global fees from US federal business. However, recent "efficiency" initiatives targeting large federal contracts have created challenges, with some firms like Deloitte experiencing contract reductions and subsequent layoffs in their federal practices.

Top 10 System Integrator Companies (Europe HQ)

According to our top 20 GSIs table, these European-headquartered companies rank among the global leaders:

1. Accenture (#1 globally) - Headquartered in Dublin, Ireland (though with strong US operations), Accenture leads the market with US$64.1 billion in revenue and 738,000 employees. Recently reported managed services revenue growth of 11%, significantly outpacing consulting revenue growth.

2. PwC (#5 globally) - Based in the UK with US$25.4 billion in revenue and 328,000 employees, PwC combines its "Big Four" accounting background with extensive consulting and digital transformation services.

3. Capgemini (#6 globally) - This French IT consulting giant generates US$23.6 billion in revenue with 340,000 employees and shows particular strength in cloud services and digital transformation.

4. EY (#12 globally) - Another UK-based "Big Four" firm with US$11.8 billion in revenue and 365,000 employees, EY continues to expand its technology consulting services.

5. Atos (#13 globally) - Headquartered in France with US$11.3 billion in revenue and 110,000 employees, Atos specializes in high-performance computing, cybersecurity, and digital workplace solutions.

Additional European system integrators that, while not in the top 20 GSIs by revenue, remain significant regional players include:

6. TietoEVRY (Finland/Sweden) - Nordic powerhouse with deep expertise in industrial and public sector solutions.

7. Sopra Steria (France) - Combines consulting, systems integration, and software development capabilities.

8. T-Systems (Germany) - The enterprise services arm of Deutsche Telekom, focusing on secure cloud solutions.

9. Indra (Spain) - Strong in defense, transportation, and public administration sectors across Europe and Latin America.

10. Computacenter (UK) - Infrastructure services provider expanding its services capabilities.

European integrators often differentiate themselves through industry specialization and regulatory compliance expertise, particularly in sectors with stringent EU regulations such as finance, healthcare, and data protection.

The changing competitive landscape in system integrations

The traditional dominance of global system integrators faces challenges from:

• Cloud-native integrators

  • Built specifically for modern cloud environments

• Industry specialists

  • Deep vertical expertise in specific sectors

• Value-added resellers (VARs)

  • Expanding beyond procurement into services

• Regional specialists

  • Strong understanding of local market needs

Companies like Insight and CDW illustrate this trend, with strategic acquisitions expanding their capabilities beyond traditional hardware procurement into comprehensive services.

Q&A with Juha Berghäll on the future of system integration

To get deeper insights into the changing system integration landscape, we spoke with Juha Berghäll, CEO and Co-founder of ONEiO, a next-generation Managed Integration Service Provider. Here's what he had to share about the evolution of integration approaches.

Q: The data shows GSIs now account for less than 9% of total IT opportunity. What's driving this shift?

Juha Berghäll: The market is experiencing a fundamental transformation driven by changing customer expectations. Ecosystem-driven service delivery is winning because customers are no longer satisfied with traditional project-based or single-partner delivery models. Today's enterprises are seeking outcome-based services, faster time-to-value, collaboration across ecosystems, and continuous managed delivery—not one-off implementations.

This shift isn't just a trend—it's a clear signal that the market is rewarding service providers who can deliver faster, collaborate better, and scale smarter. The decline in GSI market share reflects this new reality.

Q: How does this affect how businesses should approach integration?

Juha Berghäll: Businesses need to reconsider how they view integrations entirely. Rather than treating integration as a custom development effort or a series of one-time projects, forward-thinking organizations are adopting Integration Ops—a model that treats integration as a core operational capability.

At ONEiO, we've pioneered this approach to help service providers, MSPs, MSSPs, ITSM consultants, and regional SIs succeed in this new landscape. Integration Ops fits perfectly into modern multi-sourcing models as it defines clear roles and responsibilities in  multi-party collaboration instead of centralized control. In addition, when  IT service providers start treating integration as a capability and “products”, they’re able to build new recurring, high-margin service offerings as well as gain operational efficiencies at scale.

Q: What exactly is Integration Ops, and how does it differ from traditional integration approaches?

Juha Berghäll: Integration Ops is to integrations what DevOps is to software development and SecOps is to security. It's a structured, automated, and scalable way of managing integrations—turning them into a continuously improving operational function rather than a project-based burden.

Unlike traditional system integrators, which rely on project-based custom integrations, Integration Ops delivers and operates integrations as a service focusing the whole lifecycle of integrations treating them as products, not just one-off projectseliminating bottlenecks, reducing costs, and accelerating time-to-value. This is particularly important in the age of AI, where speed and adaptability are key to scaling IT services.

Q: How does this model help IT service providers stay competitive in the current market?

Juha Berghäll: IT service providers who embrace Integration Ops gain significant advantages: they can reduce integration costs and improve margins, ensure reliable and scalable service delivery, free up teams to focus on innovation rather than maintenance, and meet increasing customer expectations for standardized  service integration.

This is particularly valuable as competition intensifies. The 13% projected growth in managed services and 11.9% growth in cybersecurity services in 2025 represents an opportunity, but only for providers who can deliver these services efficiently without getting bogged down in integration challenges.

Q: What advice would you give to businesses currently evaluating system integrators?

Juha Berghäll: Look beyond size and traditional metrics. Consider partners who understand that ecosystem-driven service delivery is the future—partners who can help you adopt a model that treats integration as a core operational capability, supports multi-party collaboration, and enables recurring, high-value services at scale.

The most successful partnerships will be with providers who understand that integrations shouldn't be a bottleneck but rather a strategic enabler for innovation and growth. As the market continues to evolve, the ability to collaborate across ecosystems and deliver continuous value will be far more important than the traditional metrics by which we've evaluated system integrators in the past.

The bottom line on global system integrators today

The system integration market continues to evolve rapidly, with traditional GSIs adapting their business models to focus on managed services and cybersecurity while facing increased competition from specialized providers.

As enterprises navigate complex digital transformation initiatives and AI implementation challenges, the right integration partner can make the difference between success and costly failure. Integration Ops provides radical value in this approach to both system integrators and IT service management.

System integrators that successfully combine deep technological expertise, industry specialization, and flexible business models like Integration Ops will be best positioned to thrive in this competitive landscape. Meanwhile, customers benefit from increased choice and the shift toward value-based service delivery.