| Access to Climb CIC | Chippenham | 2024 |
| Access to Retail Limited | Leigh On Sea | 2000 |
| Access Training and Computer Services CIC | Liverpool | 2015 |
| Access UK Ltd | Loughborough | 1989 |
| Access VFX Limited | Epsom | 2018 |
| Access Web Limited | Fleet | 2024 |
| Access-It Software (UK) Limited | Chippenham | 2002 |
| ACCESS100 Ltd | Preston | 2025 |
| ACCESS2BOOKS Limited | Leighton Buzzard | 2013 |
| ACCESS2SQL Limited | Coventry | 2011 |
| ACCESS4 Ltd | Salford | 2023 |
| Accessacity Ltd | North Shields | 2025 |
| Accessadvisr Limited | Southampton | 2012 |
| Accessairbility Ltd | Salford | 2018 |
| Accessautonomy Ltd | Rye | 2020 |
| Accesscentral Limited | Southampton | 2008 |
| Accessdata UK Limited | London | 2016 |
| Accesse Ltd | London | 2025 |
| Accessgrand Limited | Richmond | 2002 |
| Accessia Emea Ltd | London | 2023 |
| Accessia Technology Ltd | London | 2021 |
| Accessibility ALL Areas Ltd | Lydney | 2023 |
| Accessibility NOW Limited | Forres | 2025 |
| Accessibility of Things C.I.C. | Southport | 2020 |
| Accessibility Online Community Interest Company | Lytham St. Annes | 2023 |
| Accessibility Powys Ltd | Swansea | 2005 |
| Accessibility Toolbar Ltd | Leeds | 2024 |
| Accessible by Design Ltd | London | 2021 |
| Accessible Creations Ltd | London | 2021 |
| Accessible Data Limited | London | 2016 |
| Accessible Digital Online Ltd | Wolverhampton | 2026 |
| Accessible Experiences Ltd | Halifax | 2016 |
| Accessible Filing Ltd | Edinburgh | 2024 |
| Accessible Intelligence Limited | Addlestone | 2017 |
| Accessible IT Limited | Coventry | 1996 |
| Accessible Marketing Collective Ltd | Nottingham | 2024 |
| Accessible ME Ltd | London | 2024 |
| Accessible Pixels Ltd | Manchester | 2025 |
| Accessible Resources Ltd | Craigavon | 2022 |
| Accessible Technologies Ltd | London | 2020 |
| Accessiq Tech Ltd | London | 2025 |
| Accessit-Group Ltd | Portsmouth | 2019 |
| Accessium Ltd | Barnard Castle | 2016 |
| Accessium Software Ltd | London | 2023 |
| Accessory LAB Limited | Frome | 2007 |
| Accessplanit Limited | Lancaster | 2009 |
| Accesspoint Digital Limited | London | 2023 |
| Accesspoint Legal Services Limited | London | 2012 |
| Accesspoint Migration Services Limited | Leeds | 2019 |
| Accesspoint Technologies Ltd | London | 2006 |
| ACCESSPOINT365 Limited | Weston-Super-Mare | 2025 |
| Accessstack Ltd | Manchester | 2025 |
| Accesstack Limited | Preston | 2026 |
| Accesstrail Ltd. | London | 2026 |
| Accessup.Ai Ltd | Bromley | 2024 |
| Accesta Limited | Luton | 2018 |
| Acceta Group Ltd | Camberley | 2024 |
| ACCEXX247 Ltd | Nottingham | 2024 |
| Accheck (UK) Ltd | Upminster | 2015 |
| Accian Limited | Leeds | 2025 |
| Accident App Ltd | Biggleswade | 2025 |
| Accident Claim Help Limited | Purley | 2013 |
| Accident Claim Treatment Ltd | Essex | 2008 |
| Accident Claims Ecosse Limited | Paisley | 2014 |
| Accident Claims Group UK Limited | London | 2025 |
| Accident Pro Services UK Ltd | Stevenage | 2025 |
| Accident Solution Experts Ltd. | London | 2015 |
| Accident Solutions Experts Ltd | London | 2016 |
| Accidental Donkey Films Ltd | London | 2025 |
| Accidental Games Studio Ltd | London | 2023 |
| Accidental Gizmo Limited | London | 2016 |
| Accidental Gods Ltd | Craven Arms | 2019 |
| Accidental Live Limited | Belfast | 2025 |
| Accinnoz Limited | London | 2008 |
| Accio BI Limited | Horsham | 2016 |
| Accio Digital Ltd | Sheffield | 2018 |
| Accio Group Limited | London | 2024 |
| Accio Medical Ltd | London | 2024 |
| Accio Research Limited | Southampton | 2022 |
| Acciobiz Ltd | Norfolk | 2008 |
| Acciod Group Limited | London | 2025 |
| Acciom Limited | Kington | 2019 |
| Accion Labs (UK) Limited | London | 2014 |
| Accipi Ltd | Godalming | 2023 |
| Accipio Limited | St. Albans | 2010 |
| Accipiter Publishing Ltd | Stockport | 2021 |
| Accipitris Limited | Baldock | 2013 |
| Accipitus Ltd | Bristol | 2025 |
| Acciva CSI Ltd | London | 2016 |
| Acciva Techno Soft Limited | Eastham | 2016 |
| Accknowledge (UK) Limited | Halstead | 2003 |
| Acclaim Digital Ltd | Chelmsford | 2020 |
| Acclaim Pictures Ltd | Romford | 2018 |
| Acclaim Productions Ltd | Worcester | 2012 |
| Acclaim Safety Systems Limited | Wakefield | 2000 |
| Acclaim Systems Ltd | Saltburn-By-The-Sea | 2001 |
| Acclaimed Content Limited | Birmingham | 2020 |
| Acclaimworks Limited | Billingshurst | 2000 |
| Acclivity Media Ltd | London | 2020 |
| Accloud PLC | Canary Wharf Estate | 2015 |