| Action Trophies Limited | Basingstoke | 2003 |
| Action Truck Parts Limited | Grimsby | 2005 |
| Action Vape Ltd | Ramsgate | 2020 |
| Action-Sealtite Limited | Coventry | 1982 |
| Actionable Holdings Limited | Glasgow | 2021 |
| Actionaid Enterprises Limited | London | 2004 |
| Actionate Limited | London | 2023 |
| Actionbond Limited | Bourne End | 1992 |
| Actionista Limited | Nottinghamshire | 2003 |
| Actionpoint Group Ltd | Sheerness | 2020 |
| Actionpoint Online Ltd | Sheerness | 2020 |
| Actionpointer Global Ltd | London | 2022 |
| Actions Bright Ltd | London | 2025 |
| Actions Global (UK) Limited | London | 2021 |
| Actions HQ Ltd | Preston | 2021 |
| Actionsport Limited | Tipton | 2008 |
| Actionsportgames UK Limited | London | 2015 |
| Actipharm Limited | London | 2008 |
| Actipro Ltd | Canvey Island | 2020 |
| Actisafe Ltd | London | 2024 |
| Actiu International Ltd. | London | 2016 |
| Actium Technologies (UK) Ltd | Whetstone | 2004 |
| Activ 99 Ltd | Spalding | 2023 |
| Activ Cycles Limited | Ashford | 2004 |
| Activ Enterprise Ltd | Derby | 2015 |
| Activ Product Services Ltd | Cardiff | 2014 |
| Activ Warehouse Ltd | East Grinstead | 2015 |
| Activ-Air Automation Limited | Sutton | 1980 |
| Activ-Tec Limited | Stafford | 2016 |
| ACTIV2 Limited | Billingham | 2015 |
| ACTIV8 Distribution Limited | Watford | 2000 |
| Activa Activewear Limited | Skelmersdale | 2023 |
| Activa Pharma Ltd | London | 2019 |
| Activate Accident Repair Group Limited | Halifax | 2019 |
| Activate Collision Solutions Limited | Halifax | 2020 |
| Activate Life Limited | London | 2026 |
| Activate Lubricants Limited | Braintree | 2015 |
| Activate Parts Limited | Halifax | 2008 |
| Activate Products Limited | Slough | 2013 |
| Activate Sales Ltd | London | 2026 |
| Activate Scientific UK Limited | Ely | 2010 |
| Activate Solutions Ltd | Ashton-Under-Lyne | 2025 |
| Activate Switch Ltd | Cowes | 2012 |
| Activate Vending Limited | Ellesmere Port | 2026 |
| Activate Your Seat Ltd | Edinburgh | 2019 |
| Activated Ltd | London | 2023 |
| Activated Marketing Limited | Carshalton | 1996 |
| Activatehappy Ltd | Cardiff | 2024 |
| Activation Keep Ltd | London | 2023 |
| Activator Trading Limited | Sutton | 2024 |
| Activave Ltd | Oxford | 2026 |
| Activclothing Ltd | London | 2025 |
| Active 360 Ltd | Manchester | 2021 |
| Active Academy Ltd | Fareham | 2013 |
| Active Air Solutions Ltd | Belmont Industrial Estate | 2022 |
| Active Alchemy Ltd | Southampton | 2023 |
| Active Alliance Limited | Peterborough | 2004 |
| Active Always Health and Wellbeing Ltd | Worcester | 2021 |
| Active Apparel Group Limited | Ashbourne | 2018 |
| Active Apparel Limited | Ashbourne | 2007 |
| Active Ascend Ltd | Washington | 2024 |
| Active Attire Limited | London | 2019 |
| Active Aura Fitness Ltd | Totland Bay | 2025 |
| Active Aura Ltd | Middlesbrough | 2023 |
| Active Automotive Limited | Wellingborough | 2007 |
| Active Babies Ltd | Tunbridge Wells | 2022 |
| Active Beauty Limited | Sutton | 2020 |
| Active Beverage Brands Ltd | Coalisland | 2019 |
| Active Bike Co Ltd | Chichester | 2020 |
| Active Birth Pools Ltd | London | 2005 |
| Active BPM Limited | Edinburgh | 2024 |
| Active Brand Concepts Limited | Swansea | 2009 |
| Active Bravo Ltd | Ilford | 2021 |
| Active Breakdown Recovery Limited | Weybridge | 2018 |
| Active Business Development Ltd | London | 2019 |
| Active Car Wash Supplies Ltd | Stourbridge | 2013 |
| Active Chemicals Ltd | Motherwell | 2019 |
| Active CLO Ltd | Belfast | 2025 |
| Active Clothing Ltd | Peterlee | 2025 |
| Active CLU8 Limited | Manchester | 2024 |
| Active Commodities Limited | London | 2023 |
| Active Connexions Limited | Hook Norton | 2002 |
| Active Creations Limited | Hull | 2022 |
| Active Cycling Projects Ltd | Crowborough | 2013 |
| Active Dancewear Limited | Bolton | 2009 |
| Active Days Ltd | Bexhill-On-Sea | 2024 |
| Active Distributions Ltd | Wolverhampton | 2025 |
| Active Drip Solutions Ltd | London | 2022 |
| Active Dynamic Limited | London | 2013 |
| Active Edge (Nutrition) Limited | Hook | 2005 |
| Active Edge Equipment Ltd | Wolverhampton | 2026 |
| Active Edge Sports Ltd | London | 2016 |
| Active Electrical Suppliers Ltd | London | 2020 |
| Active Electronics (Holdings) Limited | Exeter | 2018 |
| Active Electronics PLC | High Wycombe | 1980 |
| Active Engineering Solutions Ltd | Lanark | 2021 |
| Active Engineering Systems Limited | Fakenham | 2018 |
| Active Exchange Ltd | London | 2024 |
| Active Export Ltd | London | 2010 |
| Active Fashion Limited | Clevedon | 2026 |