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Rockwood Lithium (part of Albemarle)
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Rockwool
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Rocky Boots
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Rocky Mountain Chocolate Factory
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Rocmar Seafood
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Rocos
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Roda Group
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Rodale
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Rodamar
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Roda Mas
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Rodanto Limited
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Rodaturs
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Rodd & Gunn
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RO Defence (Royal Ordnance, part of BAE Systems)
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Roe Bros. & Co Ltd.
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Roehampton University
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Roeper
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Roger Bullivant Limited
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Rogers Corporation
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Roger Young Ltd
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Rohan
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Rohde and Schwarz UK Limited
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Rohde & Schwarz
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Rohm