Server Operating System Top Companies
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Microsoft Corporation
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Red Hat Inc. (IBM Corporation)
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SUSE Group
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Oracle Corporation
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Amazon Web Services Inc.
*Disclaimer: Top companies sorted in no particular order

Server Operating System Market Concentration

Server Operating System Company List
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Microsoft Corporation
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Red Hat Inc. (IBM Corporation)
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SUSE Group
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Oracle Corporation
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Amazon Web Services Inc.
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Canonical Ltd.
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Google LLC
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Huawei Technologies Co. Ltd.
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Alibaba Cloud Computing Co. Ltd.
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Dell Technologies Inc.
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Hewlett Packard Enterprise Co.
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Fujitsu Ltd.
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Lenovo Group Ltd.
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Cisco Systems Inc.
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NEC Corp.
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Inspur Group Co. Ltd.
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Super Micro Computer Inc.
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VMware Inc.
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Parallels International (virtuozzo)
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Joyent Inc.
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Nutanix Inc.
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FreeBSD Foundation
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Percona LLC
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OpenBSD Project
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Rocky Enterprise Software Foundation
Specific to Server Operating System Market