Mainframe Operating Systems Market Report 2026

The mainframe operating systems market size has grown steadily in recent years. It will grow from $1.83 billion in 2025 to $1.88 billion in 2026 at a compound annual growth rate (CAGR) of 2.9%. The growth in the historic period can be attributed to legacy enterprise computing dependency, growth of large scale transaction processing systems, expansion of banking and financial core systems, rise of centralized it infrastructure models, increasing demand for high reliability systems.

The mainframe operating systems market size is expected to see steady growth in the next few years. It will grow to $2.13 billion by 2030 at a compound annual growth rate (CAGR) of 3.1%. The growth in the forecast period can be attributed to migration toward hybrid cloud mainframe environments, rising need for real time transaction processing, increasing cybersecurity and regulatory compliance requirements, modernization of legacy applications through apis, demand for AI driven workload automation and optimization. Major trends in the forecast period include AI driven workload optimization in mainframes, hybrid cloud mainframe integration expansion, zero downtime high availability architecture adoption, mainframe modernization and api enablement, advanced cybersecurity and identity management in mainframes.

The increasing volume of financial transactions is expected to drive the growth of the mainframe operating systems market going forward. Financial transactions refer to the exchange or transfer of money between parties for goods, services, or financial obligations, recorded and processed through banking or payment systems. Financial transactions are increasing due to the rapid expansion of digital payment systems, which has enhanced the frequency and convenience of cashless exchanges across businesses and consumers globally. Mainframe operating systems support financial transactions by ensuring highly reliable and uninterrupted processing of large-scale payment and banking operations, even during periods of peak demand. For instance, in January 2026, according to Open Banking Limited, a UK-based non-profit entity, payment activity continued to expand rapidly, reaching 351 million transactions in 2025, up 57% year over year. Therefore, the increasing volume of financial transactions is driving the growth of the mainframe operating systems market.

Key operating companiesin the market mainframe operating systems market are concentrating on developing advanced solutions such as AI mainframes to deliver strong data security and reliability while executing AI workloads at scale, which is essential for mission-critical enterprise applications. An AI mainframe is a high-performance mainframe system engineered to natively execute and accelerate artificial intelligence workloads alongside conventional enterprise computing tasks. For example, in April 2025, International Business Machines Corporation, a US-based technology and consulting company, introduced the IBM z17 AI mainframe. Building on the z16 platform, the z17 features an enhanced architecture designed to improve AI inference performance, support multiple AI models, and enable secure real-time data processing. Its core is powered by the Telum II processor, which incorporates a second-generation on-chip AI accelerator to improve computational efficiency. IBM reports that the system is capable of processing over 450 billion AI inferences per day, representing a 50% improvement, supporting applications such as fraud detection, credit risk assessment, medical imaging analysis, and retail loss prevention.

In September 2023, Rocket Software Inc., a US-based software development company, acquired B.O.S. Group for an undisclosed amount. As a result of this acquisition, tcVISION, now referred to as Rocket Data Replicate and Sync, has been incorporated into Rocket Software’s portfolio of modernization solutions. This integration strengthens Rocket Software’s capability to provide more comprehensive, scalable, flexible, and secure solutions for mainframe data modernization challenges. B.O.S. Group is a Germany-based company specializing in mainframe operating systems.

Major companies operating in the mainframe operating systems market are Dell Technologies Inc., Hitachi Ltd., Accenture plc, International Business Machines Corporation, Oracle Corporation, Broadcom Inc., Hewlett Packard Enterprise Company, Tata Consultancy Services Limited, Fujitsu Limited, NTT DATA Group Corporation, Capgemini SE, Cognizant Technology Solutions Corporation, Infosys Limited, Kyndryl Holdings Inc., DXC Technology Company, HCL Technologies Limited, Wipro Limited, CGI Inc., Atos SE, Unisys Corporation, BMC Software Inc., Software AG, Rocket Software Inc.

North America was the largest region in the mainframe operating systems market in 2025. Asia-Pacific is expected to be the fastest-growing region in the forecast period. The regions covered in the mainframe operating systems market report are Asia-Pacific, South East Asia, Western Europe, Eastern Europe, North America, South America, Middle East, Africa. The countries covered in the mainframe operating systems market report are Australia, Brazil, China, France, Germany, India, Indonesia, Japan, Taiwan, Russia, South Korea, UK, USA, Canada, Italy, Spain.

The mainframe operating systems market consists of revenues earned by entities by providing services such as operating system licensing and subscriptions, system installation and configuration, mainframe environment management, workload optimization, virtualization management, security administration, migration and modernization services, and technical support and maintenance. The market value includes the value of related goods sold by the service provider or included within the service offering. The mainframe operating systems market also includes sales of operating system software, system management tools, middleware integration components, and enterprise monitoring utilities. Values in this market are ‘factory gate’ values, that is, the value of goods sold by the manufacturers or creators of the goods, whether to other entities (including downstream integrators, enterprises, distributors, and service providers) or directly to end customers. The value of goods in this market includes related services sold by the creators of the goods.

The market value is defined as the revenues that enterprises gain from the sale of goods and/or services within the specified market and geography through sales, grants, or donations in terms of the currency (in USD unless otherwise specified).

The revenues for a specified geography are consumption values that are revenues generated by organizations in the specified geography within the market, irrespective of where they are produced. It does not include revenues from resales along the supply chain, either further along the supply chain or as part of other products.

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