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IREM
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IRESS (UK) Limited
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IRI Consultants
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Iridium
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IrisGuard
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Irish Football Association
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Irish Rail (part of Córas Iompair Éireann)
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Iris Nation Worldwide Limited
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Iris Recruitment Agency
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IRIS Software Group Ltd
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Irit
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Irlanda Apartments
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iRobot Corporation
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Iron Force Industrial
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Ironmongerydirect Limited
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Iron Mountain
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Iron Ore Company of Canada (JV between Rio Tinto (58.7%), Mitsubishi Corporation (26.2%) and Labrador Iron Ore Royalty Corporation (15.1%))
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Ironsource UK Limited
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IRPC
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Irrawaddy Green Towers
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IRTC (Ionian Refining & Trading Company)
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Irving Materials
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Irving Oil
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Irving Resources Inc.