| Action & Answers Ltd | London | 2009 |
| Action & Change Ltd | Bolton | 2024 |
| Action 2 Results Limited | Eastleigh | 2006 |
| Action 4 Success (Scotland) Limited | Troon | 2010 |
| Action 99 Cars Ltd | Edgware | 2010 |
| Action Accountants Ltd | London | 2017 |
| Action and Achieve Limited | Bolton | 2020 |
| Action and Theory Ltd | Basingstoke | 2011 |
| Action Argyll Limited | Northampton | 2019 |
| Action Art Limited | London | 2001 |
| Action Artificial Intelligence Limited | Coventry | 2015 |
| Action Automotive Limited | Bradenham | 2002 |
| Action Bookkeeping Ltd | London | 2020 |
| Action Carpets (Holdings) Limited | Ashford | 2016 |
| Action Circuits Holdings Limited | Luton | 2016 |
| Action Click Limited | London | 2025 |
| Action Communications Group Limited | London | 2010 |
| Action Computer Supplies Limited | Sheffield | 1990 |
| Action Counts Ltd | Seascale | 2023 |
| Action Credit Management Limited | Truro | 2010 |
| Action CX Ltd | London | 2023 |
| Action Deafness | Leicester | 2008 |
| Action Desk Systems Limited | Derby | 1990 |
| Action Direct Response Limited | Somerset | 2005 |
| Action Doors (Industrial) Limited | Bridgend Industrial Estate | 2006 |
| Action Equity Ltd | Bromley | 2014 |
| Action for Care Contracts Limited | Belper | 2020 |
| Action for Change (Scotland) Ltd. | Kincardine On Forth | 2008 |
| Action for Community Development Limited | London | 2009 |
| Action for Diversity and Development Ltd | London | 2007 |
| Action for Financial Inclusion (Affi) CIC | London | 2021 |
| Action for Innovation Ltd | Great Chesterford | 2012 |
| Action for Local Change CIC | High Wycombe | 2025 |
| Action for Reducing Carbon Limited | Ruislip | 2007 |
| Action for Retrofit Limited | Nottingham | 2025 |
| Action for Sustainability Ltd | Dursley | 2012 |
| Action Force Business Improvement Ltd | Aylesbury | 2025 |
| Action Group Services Ltd | Swansea | 2020 |
| Action HR Limited | Redditch | 2004 |
| Action in Change Ltd | Shepton Mallet | 2010 |
| Action Indoor Sports Ltd | Lichfield | 2009 |
| Action Insight Management Ltd | Edinburgh | 2010 |
| Action IT Electrical Limited | King'S Lynn | 2006 |
| Action Labs Consultancy Ltd | London | 2024 |
| Action Learning Academy Limited | Bridgend | 2015 |
| Action Learning Associates Limited | London | 1998 |
| Action Learning Centre ALC Limited | Doncaster | 2015 |
| Action Learning Partnership Limited | Bucks | 1995 |
| Action Limited | Sheffield | 1990 |
| Action Location Limited | Paisley | 2019 |
| Action Marketing Works Limited | Reading | 2024 |
| Action Medical Research | London | 1955 |
| Action NET Zero CIC | Bath | 2020 |
| Action on Armed Violence | London | 2007 |
| Action Outreach Support Network CIC | Swansea | 2026 |
| Action Petz Franchise Ltd | Cardiff | 2015 |
| Action Planning Consultancy Ltd | Nottingham | 2005 |
| Action Point Training & Consultancy Ltd | Worcester | 2011 |
| Action Potential Group Ltd | Bristol | 2016 |
| Action Potential Performance Group Limited | Lytham St. Annes | 2025 |
| Action Potential Venture Capital Limited | Stevenage | 2013 |
| Action Programme Management Ltd | Glasgow | 2013 |
| Action Project (UK) Ltd | Peterborough | 2008 |
| Action Properties (North West) Limited | Stockport | 2008 |
| Action Rail & Civil Engineering Ltd | Cardiff | 2017 |
| Action Reclaim Ltd | Warrington | 2016 |
| Action Renewables Energy Trading Limited | Belfast | 2010 |
| Action Replay Photography Ltd | Barnoldswick | 2010 |
| Action Research & Communications Ltd | Nottingham | 2024 |
| Action Research Holdings Ltd | Enfield | 2026 |
| Action Research Network (ARN) Limited | Enfield | 2022 |
| Action Resource Management Limited | Dundee | 2014 |
| Action Response Training Limited | Wigan | 2011 |
| Action Results Limited | Wembley | 2013 |
| Action Rocket Ltd | Cambridge | 2011 |
| Action Safety Ltd | London | 2007 |
| Action Services Group Ltd | Edinburgh | 2026 |
| Action Shot Photos Ltd | London | 2024 |
| Action Signs & Graphics Limited | Harrow | 2010 |
| Action Sports Events Ltd | Halesowen | 2016 |
| Action Sports Timing Ltd | Halesowen | 2016 |
| Action Stations Marketing Limited | Reading | 2000 |
| Action Sustainability (Trading) Limited | London | 2010 |
| Action This Day Limited | Kendal | 2019 |
| Action Traffic Management Ltd | Beccles | 2021 |
| Action Training Ltd | Waltham Abbey | 2022 |
| Action Visuals Ltd | London | 2026 |
| Action Wealth Limited | Edmonton | 2010 |
| Actionable Advice Limited | London | 2003 |
| Actionable Alpha Ltd | London | 2026 |
| Actional Models Ltd | Sawbridgeworth | 2022 |
| Actioncoach West Dorset Ltd | Tring | 2021 |
| Actioncrest Services Ltd. | London | 2017 |
| Actiondesk Ltd | Maidstone | 2025 |
| Actionhelp Consulting Limited | London | 2025 |
| Actioninclusion Ltd | Orpington | 2024 |
| Actionis Consulting Limited | London | 2016 |
| Actionistasx Limited | Chester | 2019 |
| Actionize Limited | Farnborough | 2022 |
| Actionline Research and Training Limited | Surbiton | 2002 |