| ACT Associates Ltd | ||
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| Actaris | ||
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| Actaris | ||
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| Actaris SAS | ||
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| AcTecS Ltd | ||
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| Action (Midlands) Ltd | ||
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| Action Can | ||
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| Action Can Ltd | ||
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| Action Discs | ||
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| Action Energy | ||
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| Action for Tinnitus Research | ||
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| Action Handling Equipment Ltd | ||
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| Action on Addiction | ||
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| Action Storage Systems Limited | ||
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| Action Training (Stoke) Ltd | ||
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| Actionair Group | ||
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| ActionDry Co Ltd | ||
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| Activ-Air Automation Ltd | ||
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| Activ-Air Automation Ltd | ||
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| Activator UK Ltd | ||
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| Active Handling Systems | ||
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| Active Rentals Ltd | ||
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| Active Research | ||
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| Acton & West London College | ||
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| Acton Jennings | ||
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| Actspark C/o Agie Charmilles Ltd | ||
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| Actual Support Services Ltd | ||
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