Mainframes are data servers designed to process up to 1 trillion web transactions daily with the highest levels of security and reliability.
At their core, mainframes are high-performance computers with large amounts of memory and processors that process billions of simple calculations and transactions in real time. The mainframe is critical to commercial databases, transaction servers, and applications that require high resiliency, security, and agility.
The Mainframe industry can be broken down into several segments, Z Systems, GS Series, Others, etc.
Across the world, the major players cover IBM, Unisys, Fujitsu, etc.
According to the new market research report “Mainframe - Global Market Share and Ranking, Overall Sales and Demand Forecast 2024-2030”, published by QYResearch, the global Mainframe market size is projected to reach USD 1.71 billion by 2029, at a CAGR of -2.2% during the forecast period.

Source: QYResearch, "Mainframe - Global Market Share and Ranking, Overall Sales and Demand Forecast 2024-2030”

Source: QYResearch, "Mainframe - Global Market Share and Ranking, Overall Sales and Demand Forecast 2024-2030”
The global key manufacturers of Mainframe include IBMUnisys, etc. In 2021, the global top three players had a share approximately 84.0% in terms of revenue.
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