| Applied Scientific Technologies UK Ltd | Middlesbrough | 2017 |
| Applied Shapes Limited | Bournemouth | 2012 |
| Applied Synergy Ltd | Nottingham | 2019 |
| Applied Synergy Solutions Limited | Manchester | 2024 |
| Applied System Interiors Limited | Kingston Upon Thames | 2019 |
| Applied Systems Go Ltd | London | 2020 |
| Applied Tech Ltd | Lidsey, Bognor Regis | 2011 |
| Applied Technical Products Limited | Stokesley | 2007 |
| Applied Technology Developments Limited | Thrapston | 1989 |
| Applied Teleharmonics Limited | London | 2025 |
| Applied Thermal Control Limited | Cambridge | 1995 |
| Applied Thoughts Ltd. | Worcester | 1999 |
| Applied Time Sciences Limited | Cambridge | 2025 |
| Applied Traffic Limited | Reading | 2001 |
| Applied Vibration Limited | Tamworth | 1976 |
| Applied VWS Limited | Reading | 2025 |
| Applied Weighing International Limited | Reading | 1993 |
| Appliedlife BIO Technology Limited | London | 2024 |
| Appmechanix Ltd | London | 2020 |
| Appointed Fashion Ltd | Bradford | 2024 |
| Appola Desserts Ltd | Edinburgh | 2026 |
| Appollo Engineering Ltd | Cheltenham | 2006 |
| Appolo Community Support CIC | Stoke-On-Trent | 2023 |
| Appoway Ltd | Sevenoaks | 2019 |
| Apprintable Limited | Wembley | 2015 |
| Appropriate Staging Limited | Newhaven | 2013 |
| Approved Caravan Services Limited | Bishopton | 2007 |
| Approved Fabrications Limited | Dudley | 2023 |
| Approved Fire Protection Limited | Melton Mowbray | 1994 |
| Approved Joinery Ltd | Bangor | 2023 |
| Approved Maintenance Limited | Coventry | 2026 |
| Approved Pharma Solutions Ltd | Bainton | 2014 |
| Approved Plumbing & Heating Solutions Ltd | Staines-Upon-Thames | 2026 |
| Approved Powder Coating Limited | Cardiff | 2019 |
| Approved Technology Limited | Bournemouth | 2008 |
| APPS4ENGINEERING Ltd | Uxbridge | 2025 |
| Appsofficial Ltd | Wokingham | 2024 |
| Appspice Ltd | London | 2025 |
| Appspring Studio Ltd | Cardiff | 2024 |
| Apption Labs Limited | North Finchley | 2015 |
| Appybrand Ltd | Windsor | 2026 |
| APR Bespoke Joinery Ltd | Middlesbrough | 2020 |
| APR Distributors Limited | Bridgend | 2003 |
| APR Electrical Solutions Ltd | Rotherham | 2012 |
| Apreco Limited | London | 1997 |
| Apres at Home Ltd | Wokingham | 2020 |
| Apres Midi Limited | London | 2022 |
| Apretes Electric Systems Limited | London | 2012 |
| Apricity Coffee Ltd | Prestatyn | 2025 |
| Apricity Dreams Co Ltd | Cambridge | 2021 |
| Apricot Lotus Digital Ltd | Kington | 2024 |
| Apricot Noir Limited | London | 2026 |
| April Brothers Ltd | Kettering | 2018 |
| April Crichton Ltd. | Glasgow | 2011 |
| April Doll Limited | Bury | 2025 |
| April Fool's Day Limited | London | 2023 |
| April Robotics Limited | Peterborough | 2019 |
| April RU WAN Studio Ltd | London | 2025 |
| April Sky Limited | Bedfordshire | 2002 |
| April’S Baker Limited | Newbury | 2019 |
| Aprimite Limited | London | 2025 |
| Apro Building Limited | Swansea | 2024 |
| Aprograph Sign Systems Ltd | Gateshead | 2006 |
| Aprolis UK Limited | Hull | 1990 |
| APRONS4SCHOOLS Ltd | London | 2025 |
| APS Carpentry Midlands Limited | Birmingham | 2021 |
| APS Catering and Electrical Services Ltd | Stockport | 2010 |
| APS Doctors Limited | Inverness | 2016 |
| APS Exteriors UK Ltd | Bushey | 2025 |
| APS GB Limited | Chesterfield | 2009 |
| APS Group Secure Solutions Limited | Stockport | 2009 |
| APS Industrial Doors Limited | Kelso | 2017 |
| APS Industrial Engineering Ltd | Wigan | 2018 |
| APS Metal Pressings Limited | Birmingham | 1980 |
| APS Motorsports Ltd | The Parklands | 2013 |
| APS Packaging Limited | Devon | 2002 |
| APS Signs Limited | West Yorkshire | 2003 |
| APS Ventilation Services Limited | Cheadle | 2026 |
| APS Woodwork Ltd | Calne | 2013 |
| Apsl Drains Ltd | Pinner | 2023 |
| Apsl Limited | Pinner | 2001 |
| Apsl Systems Limited | Rugby | 2016 |
| Apsl Technical Limited | Southampton | 2008 |
| Apsley Bags Ltd | Wisbech | 2017 |
| Apsley Carpentry Ltd | Bristol | 2025 |
| Apsley Controls Limited | Reading | 1983 |
| Apsley Precision Engineering Ltd | Salisbury | 2010 |
| Apsn Group Ltd | London | 2023 |
| Apsv Coatings Ltd | Carnforth | 2020 |
| APT Controls Limited | Nelson | 2018 |
| APT Door Group Limited | Bury | 2026 |
| APT Elevators Limited | Leeds | 2023 |
| APT Interiors Limited | Bruton | 2017 |
| APT Ltd | London | 2026 |
| APT Pharma Ltd | London | 2025 |
| APT Productions Limited | Colne | 2021 |
| APT Security Shutters Limited | Bury | 2016 |
| APT Windows Ltd | Soham | 2011 |
| Apt-Skidata Limited | Hemel Hempstead | 1998 |
| APT. Fabrics Ltd | Newtownards | 2008 |