| Actes Trust | Middlesbrough | 2001 |
| Actfast Drain Services Ltd | Rochdale | 2008 |
| Actfastresources Limited | Bolton | 2023 |
| Actif RSV Ltd | Durham | 2004 |
| Actif Software Limited | Carlisle | 2022 |
| Actiform Hire Limited | Mirfield | 1984 |
| Actimus Limited | London | 2009 |
| Acting Genius Limited | Ilford | 2022 |
| Acting Practice Limited | London | 2024 |
| Actinity Ltd | London | 2016 |
| Actinium Limited | London | 2025 |
| Actinvite Limited | Bolton | 2023 |
| Actio Recruitment Limited | Wimborne | 2022 |
| Action 8 Recruitment Limited | London | 2022 |
| Action Aces Limited | Smethwick | 2024 |
| Action Adventure Pursuits Limited | Cannock | 2024 |
| Action Against Discrimination | London | 2013 |
| Action Alarms (Midlands) Limited | Nottingham | 2004 |
| Action Apps Limited | Swaffham | 2020 |
| Action Artists Agency Ltd | Wokingham | 2021 |
| Action Arts Limited | Barnsley | 2006 |
| Action Audio Visual Limited | Northwood | 1992 |
| Action BEE Cleaning Limited | Chiswick | 2006 |
| Action Boss Ltd | London | 2023 |
| Action Care Management Ltd | Leeds | 2018 |
| Action Care Services Ltd | Merthyr Tydfil | 2019 |
| Action Cleaning and Renovation Limited | Tilbury | 2009 |
| Action Community Enterprises CIC | Norwich | 2011 |
| Action Display Ltd | Macclesfield | 2021 |
| Action Doors Ltd | Bridgend | 2017 |
| Action Electroplating Co. Limited | London | 1983 |
| Action Employment Services Ltd | London | 2021 |
| Action Endurance Limited | Torquay | 2014 |
| Action Enviro Maintenance Limited | Cramlington | 2010 |
| Action EPC Limited | Basildon | 2002 |
| Action Events Limited | Cheltenham | 1998 |
| Action Fire and Security Ltd | Smethwick | 2023 |
| Action Fire Ltd | London | 2009 |
| Action First Assessments Ltd | London | 2018 |
| Action for Business (Bradford) Limited | Bradford | 1992 |
| Action for Life CIC | London | 2026 |
| Action Force Pest Prevention Limited | Bristol | 2025 |
| Action Foundation | Newcastle Upon Tyne | 2009 |
| Action Group Holdings Ltd | London | 2016 |
| Action Hire Limited | Pontypridd | 2011 |
| Action Incorporated Ltd | Ashford | 2022 |
| Action Industrial Cleaning Services (UK) Limited | Hornchurch | 1999 |
| Action Integrated Security Services (NI) Limited | Warrenpoint | 2025 |
| Action IT Limited | Bradford | 2013 |
| Action Jackson Global Limited | Ruislip, | 2025 |
| Action K9 Security Limited | London | 2011 |
| Action Kids Ltd | London | 2019 |
| Action Management Services Limited | Oakham | 1987 |
| Action Marketing UK Ltd | Benfleet | 2007 |
| Action Mental Health | Newtownards | 1963 |
| Action Office Systems Limited | Rochester | 2008 |
| Action Office UK Ltd | Cambridgeshire | 2000 |
| Action Outdoors Holidays Limited | Suffolk | 2004 |
| Action P & M Limited | Cramlington | 2009 |
| Action Partners Corporation | Doncaster | 1907 |
| Action PAS Limited | Bristol | 2018 |
| Action Pest Control Facilities Ltd | Liverpool | 2013 |
| Action Pest Control Limited | Altrincham | 1994 |
| Action Plant Hire Ltd | Swindon | 2018 |
| Action Plus Consulting Ltd | Cardiff | 2019 |
| Action Potential Tech Ltd | Wembley | 2013 |
| Action Recruiters Limited | Dunstable | 2022 |
| Action Recruitment Services Ltd | Peterborough | 2023 |
| Action Security Service Ltd | London | 2023 |
| Action Self Drive Limited | Birmingham | 2006 |
| Action Solutions Gift Cards Limited | Whitby | 2006 |
| Action Staffing Ltd | Wolverhampton | 2025 |
| Action Surveillance and Cctv Limited | Llanelli | 2009 |
| Action Sustainability Community Interest Company | Maidenhead | 2006 |
| Action Tax Consulting Limited | Southampton | 2008 |
| Action Tours Limited | Shropshire | 1992 |
| Action Trust (Leicester) Ltd | Leicester | 2014 |
| Action Vehicle Services Ltd | Liverpool | 2024 |
| Action Vehicles Ltd | Ilford | 2020 |
| Action Visas (UK) Limited | London | 1997 |
| Action West London | London | 1998 |
| Action Window Cleaning Ltd | Eastleigh | 2017 |
| Action Youth Boxing Intervention C.I.C. | London | 2017 |
| Action Youth Limited | Middlewich | 1986 |
| Actionable Investments Limited | London | 2016 |
| Actionben Entertainment Ltd | Birmingham | 2025 |
| Actionclose Residents Management Limited | St. Leonards-On-Sea | 1986 |
| Actioncoach Emea Ltd | Esher | 2012 |
| Actioncoach Foundation Ltd | Leicester | 2016 |
| Actioncoach Ipco Ltd | Esher | 2012 |
| Actiondrome Limited | Chippenham | 2007 |
| Actionlanka (PVT) Limited | Worcester | 2025 |
| Actionmirror Limited | Caterham | 2006 |
| Actions and Words Ltd | Grantown-On-Spey | 2021 |
| Actions NOW Ltd | Liverpool | 2021 |
| Actions on Consultancy Ltd | Liverpool | 2020 |
| Actionson Ltd | Coleford | 2025 |
| Actioprima Ltd | London | 2013 |
| Actipharm Cars Ltd | London | 2023 |
| Actire Limited | London | 2016 |