| Actionmakers Ltd | Prescot | 2023 |
| Actionnaire Consulting Limited | Manchester | 2019 |
| Actionplas (Holdings) Limited | Pudsey | 2014 |
| Actionsense Ltd. | Londonderry | 2012 |
| Actionsharp Limited | Ware | 1986 |
| Actiontimevision Limited | Tonbridge | 2004 |
| Actionus Development Limited | Hamilton | 2010 |
| Actionview Limited | Derbyshire | 1993 |
| Actionwealth Holding Limited | London | 2020 |
| Actionworks UK Ltd | Colchester | 2007 |
| Actipro Energy Ltd. | Worthing | 2010 |
| Actiri Ltd | Hartshorne | 2012 |
| Actis Africa Limited | | 2003 |
| Actis International Limited | | 2003 |
| Actis Skillset Limited | Braintree | 2003 |
| Actis Venas Holdings Limited | London | 2025 |
| Actis Venas Investments Limited | London | 2025 |
| Actisell Limited | Bishop'S Stortford | 2014 |
| Actit Holdings Limited | Ipswich | 2025 |
| Actium Design Limited | Henley-On-Thames | 2009 |
| Actium Holdings Limited | London | 2016 |
| Activ Design Ltd | Plymouth | 2025 |
| Activ Group Support Ltd | Spalding | 2023 |
| Activ Marketing Group Limited | Cardiff | 2020 |
| Activ Mgmt Ltd | London | 2017 |
| Activ People Group Limited | Dunstable | 2025 |
| Activ Sustainability Ltd | Chislehurst | 2022 |
| Activ-Step Limited | Gloucester | 2004 |
| ACTIV8 Accounting Ltd | Castleford | 2019 |
| ACTIV8 Consulting Ltd | London | 2026 |
| ACTIV8 Creators Ltd | Welling | 2026 |
| ACTIV8 EBT Company Ltd | Swalwell | 2014 |
| ACTIV8 Events Limited | London | 2023 |
| ACTIV8 Live Ltd | Wisborough Green | 2019 |
| ACTIV8 Mktg Ltd | Tunbridge Wells | 2024 |
| ACTIV8 Payroll Limited | Castleford | 2022 |
| ACTIV8 Services Ltd | Manchester | 2019 |
| ACTIV8 Solutions Ltd | Forres | 2020 |
| ACTIV8US Global Ltd | Nottingham | 2022 |
| Activa Consulting Services Ltd | London | 2023 |
| Activat Ltd | Birmingham | 2026 |
| Activate - Workman Placemaking Ltd | London | 2019 |
| Activate Advisory Ltd | London | 2026 |
| Activate BDM Limited | Birmingham | 2018 |
| Activate Client Management Limited | Melksham | 2020 |
| Activate Digital Limited | Liverpool | 2017 |
| Activate Growth Ltd | London | 2024 |
| Activate Human Capital Ltd | Shaftesbury | 2025 |
| Activate Management Limited | Alcester | 2015 |
| Activate Marketing Ltd | Melksham | 2025 |
| Activate Research Limited | Fleet | 2021 |
| Activate Safeguarding Resolutions Ltd | Bishop Auckland | 2018 |
| Activate the City Ltd | Rochdale | 2019 |
| Activate Trade Training Ltd | Waterlooville | 2020 |
| Activate Training Ltd | Durham | 2018 |
| Activated Carbon Innovation UK Ltd | Nottingham | 2019 |
| Activated Spaces Ltd | Wadhurst | 2021 |
| Activating Change Ltd | Isleworth | 2017 |
| Activation Digital Ltd | Bristol | 2010 |
| Activation Energy Limited | Solihull | 2017 |
| Activation International (UK) Limited | Manchester | 2022 |
| Activationcode Ltd | Richmond | 2019 |
| Activationx Ltd | Leicester | 2025 |
| Active Accountancy Services Ltd | | 2006 |
| Active Accountants Ltd | Heywood | 2021 |
| Active Accounting Limited | Buckinghamshire | 2007 |
| Active Accounting Solutions Limited | Melksham | 2018 |
| Active Accounts Payroll Ltd | Cardiff | 2021 |
| Active Aero Drone Services Ltd | Birmingham | 2025 |
| Active Alpaca Limited | Stanmore | 2019 |
| Active Anglo Chinese Communications Limited | London | 2017 |
| Active Animals Rescue and Rehabilitation Ltd | Wick | 2019 |
| Active Balance Consultancy Limited | Chatham | 2022 |
| Active Behaviour Limited | Glasgow | 2019 |
| Active Branding Limited | Leeds | 2006 |
| Active Brands Limited | Wardle, Nantwich | 2009 |
| Active Building Control Service Ltd | Birmingham | 2025 |
| Active Business Consultants Limited | Dudley | 1991 |
| Active Business Consulting Ltd | Kendal | 2000 |
| Active Business Ltd | Dudley | 2015 |
| Active Business Partnerships (Consultancy) Limited | Lincoln | 2022 |
| Active Business Partnerships Limited | Lincoln | 2009 |
| Active C & P Holdings Limited | Ashford | 2012 |
| Active Capital Ltd | London | 2021 |
| Active Care Agency (UK) Ltd | Ilford | 2021 |
| Active Care U.K. Ltd | Leigh-On-Sea | 2004 |
| Active Cell Ltd | Lingfield | 2017 |
| Active Certification Services Register Ltd | Manchester | 2021 |
| Active Coaching Limited | London | 2005 |
| Active Commercial Services Limited | Shefford | 2019 |
| Active Community Engagement and Development Ltd | London | 2014 |
| Active Compliance Services Limited | Brighouse | 1999 |
| Active Computer Systems Ltd | Felpham | 2020 |
| Active Consulting Limited | Barnsley | 2000 |
| Active Content Limited | London | 2022 |
| Active Control Solutions Limited | Chester | 2015 |
| Active Cosmetics Limited | Manchester | 2001 |
| Active CSD Ltd | Bristol | 2024 |
| Active Data Ltd | Uxbridge | 2002 |
| Active Days Mobility Ltd | Bexhill-On-Sea | 2019 |