| Actgrange Properties Limited | London | 2000 |
| Action Centres UK Limited | Northants | 1989 |
| Action for Homeless Liverpool CIC | St. Helens | 2024 |
| Action Homeless (Leicester) Limited | Wigston | 1989 |
| Action Pizza Limited | Skelmersdale | 2022 |
| Action Properties Limited | Horncastle | 2025 |
| Action Reign Company (A.R.C.) Limited | Surbiton | 1997 |
| Action Services Solutions Ltd | Caterham | 2023 |
| Action Space Bar Limited | Uxbridge | 2024 |
| Action Speaks C.I.C. | Milton Keynes | 2020 |
| Actionjackson Limited | Liverpool | 2025 |
| Actionprompt Limited | Leeds | 2008 |
| Actionwell Limited | Stockport | 1996 |
| Actionzone Limited | Cardiff | 2014 |
| Activ 75 Limited | Spalding | 2024 |
| Activ 75 Trading Limited | Spalding | 2024 |
| Activ 89 Ltd | Spalding | 2023 |
| Activ Red Ltd | Peterborough | 2013 |
| Activant Solution Ltd | Cardiff | 2019 |
| Activated Food Limited | London | 2018 |
| Active Bistro Ltd. | Glasgow | 2018 |
| Active Children Ltd | Eastbourne | 2008 |
| Active Entertainment Edinburgh Limited | London | 2021 |
| Active Food Ltd | Gloucester | 2018 |
| Active Hospitality NO2 Limited | London | 2020 |
| Active Kitchen Ltd | Doncaster | 2026 |
| Active Lifestyle Resorts Limited | Norwell | 2017 |
| Active Nomads Ltd | Bracknell | 2024 |
| Active Northumberland Trading Limited | Newcastle Upon Tyne | 2014 |
| Active Options Limited | London | 2022 |
| Active Premises Limited | Hove | 2025 |
| Active Study and Travel Services Ltd | London | 2022 |
| Active Technical Services Ltd. | Aberdeen | 1998 |
| Active Wellbeing Works Limited | Birmingham | 2020 |
| Active Wellness Centre Ltd | London | 2021 |
| Active WOK Ltd | Belfast | 2026 |
| Active WSO Ltd | Church Stretton | 2022 |
| Active WSO NO1 Ltd | Church Stretton | 2022 |
| Activict Limited | Wallsend | 2011 |
| Activior Limited | Scunthorpe | 2024 |
| Activity Island Limited | Coalville | 1983 |
| Activity Junction Ltd | Hull | 2024 |
| Acton AID C.I.C. | Bristol | 2018 |
| Acton Arts CIC | London | 2018 |
| Acton Bella Italia Ltd | London | 2019 |
| Acton Cafe Limited | London | 2012 |
| Acton Carpark Limited | Borehamwood | 2025 |
| Acton Court Hotel Limited | Cheshire | 1964 |
| Acton Field Campsite Limited | Swanage | 2002 |
| Acton Food House Ltd | London | 2025 |
| Acton Food Ltd | London | 2021 |
| Acton Grove Catering Ltd | Weybridge | 2007 |
| Acton Market Falafel Ltd | London | 2024 |
| Acton Market Limited | London | 2025 |
| Acton Palac Ltd | Acton | 2015 |
| Acton Pubs Ltd | York | 2026 |
| Acton Scott Enterprises Ltd | Church Stretton | 2022 |
| Acton Spice Ltd | London | 2026 |
| Acton W3 Apartments Ltd | Sidcup | 2022 |
| Actonlounge Ltd | London | 2019 |
| Acts of Light Ltd | Leeds | 2025 |
| Acts Simply Functioning Limited | Solihull | 2001 |
| Acturis Investments Ltd | Loughborough | 2023 |
| Actv Four Ltd | Richmond Upon Thames | 2022 |
| Actv Nineteen Ltd | Richmond Upon Thames | 2021 |
| Acuaj Ltd | London | 2019 |
| Acube Cafe Ltd | London | 2026 |
| Acuity Property Services Limited | Rugby | 2010 |
| Acuity Vision Properties Limited | Guisborough | 2022 |
| Acumen Community Buildings Enterprises Ltd | Houghton Le Spring | 2023 |
| Acun Arslan Ltd | London | 2025 |
| Acun Pizza Ltd | Rotherham | 2025 |
| Acuntezgel Ltd | Stoke-On-Trent | 2022 |
| Acutus Properties Limited | Nairn | 2023 |
| ACV Cafe Ltd | London | 2015 |
| Acvitus Limited | Sunbury-On-Thames | 2025 |
| AD & Co Properties Ltd | Plymouth | 2024 |
| AD & SB Ltd | Reading | 2021 |
| AD (Glasgow) Ltd | Glasgow | 2020 |
| AD 888 Limited | Leicester | 2024 |
| AD Astra Bars Ltd | London | 2021 |
| AD Astra BC Ltd | Manchester | 2021 |
| AD Astra BF Limited | Bradford | 2023 |
| AD Astra ST Annes Ltd | Clitheroe | 2021 |
| AD Bivol Ltd | Daventry | 2025 |
| AD Busu Ltd | Ipswich | 2022 |
| AD Catering Services Ltd | Cleckheaton | 2021 |
| AD Catering UK Limited | Newquay | 2018 |
| AD Eatery Ltd | Harrow | 2024 |
| AD Events Limited | London | 1998 |
| AD Feather Limited | Beverley | 2017 |
| AD Food & Beverages Ltd | London | 2024 |
| AD Food Valley Ltd | Hayes | 2022 |
| AD Foods (Bolton) Ltd | Bolton | 2024 |
| AD Fryer Ltd | Grimsby | 2026 |
| AD HOC Catering (Plymouth) Ltd | Plymouth | 2025 |
| AD HOC London Ltd | London | 2022 |
| AD LIB Pubs Ltd | Maidenhead | 2020 |
| AD Loca Ltd | Woking | 2025 |
| AD Lounge Bar Ltd | Doncaster | 2025 |