| Abbeydale Properties (Ilkley) Limited | Real estate | 2022 |
| Abbeyhouse Property Consultants Ltd | Real estate | 2019 |
| Abbott Property Investment Ltd | Real estate | 2022 |
| ABC Polymer Holdings Limited | Wholesale & retail | 2021 |
| ABC Polymer Solution Holdings Ltd | Other services | 2018 |
| Abdell Ltd | Wholesale & retail | 2023 |
| Abdul W Hussain Ltd | Professional & scientific | 2021 |
| Abee’S Eyelashes and Brows Ltd | Wholesale & retail | 2023 |
| Abela Property Ltd | Real estate | 2020 |
| Abela Rentals Ltd | Real estate | 2019 |
| Aberdale Ltd | Wholesale & retail | 2021 |
| ABI Estate Ltd | Real estate | 2026 |
| Abid Trade Ltd | Wholesale & retail | 2025 |
| Ability Options Ltd | Health & social care | 2016 |
| Abisia Trading Ltd | Wholesale & retail | 2024 |
| Able and Ward Limited | Professional & scientific | 2016 |
| Able Care Huddersfield Ltd | Health & social care | 2018 |
| Able Fuels Limited | Other services | 1998 |
| Abmac Limited | Construction | 2004 |
| ABN Developments Ltd | Real estate | 2017 |
| About Boxing Limited | Information & communication | 2026 |
| Above Stairs Ltd | Hospitality | 2026 |
| ABR Sheet Metal Ltd | Manufacturing | 2013 |
| Abrar Butchers Ltd | Wholesale & retail | 2022 |
| Abs.Platinumproperties Limited | Real estate | 2023 |
| Abscp Limited | Wholesale & retail | 2023 |
| Absolute Engineering Limited | Manufacturing | 2004 |
| Absolute Internet Business Solutions Limited | Administrative & support | 2006 |
| Absolute Media (U.K.) Limited | Professional & scientific | 1999 |
| Absolute Specialists Ltd | Administrative & support | 2010 |
| Abson Developments Limited | Information & communication | 2003 |
| Abstrakt 89 Ltd | Information & communication | 2023 |
| Abta Hardware Ltd | Wholesale & retail | 2026 |
| Abtnm International Ltd | Wholesale & retail | 2021 |
| Abubakar Traders Ecom Limited | Wholesale & retail | 2023 |
| Abubakker and Amnah Limited | Health & social care | 2013 |
| Abuhamdah Ltd | Professional & scientific | 2018 |
| Abundance Empire Limited | Wholesale & retail | 2021 |
| Abundance Transport Ltd | Transport & logistics | 2020 |
| Abundex Ltd | Wholesale & retail | 2026 |
| AC David Properties Ltd | Real estate | 2025 |
| AC Event Hires Ltd | Hospitality | 2025 |
| AC Social Care Limited Limited | Health & social care | 2026 |
| AC Trade Supplies Limited | Wholesale & retail | 2023 |
| Ac&F Ltd | Hospitality | 2020 |
| AC1 Stays Ltd | Real estate | 2022 |
| Acacus Traders Ltd | Wholesale & retail | 2020 |
| Academy Beauty Studio Ltd | Other services | 2025 |
| Academy Hair Studio Ltd | Other services | 2018 |
| Academy of K9 Detection Ltd | Administrative & support | 2020 |
| Academys Hair Studio Ltd | Other services | 2025 |
| Accelerate Opex Limited | Professional & scientific | 2020 |
| Accent Ventures Ltd | Real estate | 2017 |
| Access Counselling Ltd | Health & social care | 2023 |
| Access Door Automation Ltd | Manufacturing | 2014 |
| Access North Ltd | Construction | 2005 |
| Access North Properties Limited | Hospitality | 2015 |
| Accident Car Clinic Ltd | Wholesale & retail | 2014 |
| Accomplier Ltd | Wholesale & retail | 2023 |
| Accord Cctv & Alarms Ltd | Construction | 2022 |
| Account Links Ltd | Extraterritorial | 2022 |
| ACCOUNT2U Limited | Professional & scientific | 2020 |
| Accountancy Excellence Limited | Professional & scientific | 2020 |
| Accrington Packing and Storage Limited | Professional & scientific | 1957 |
| Accu Digital Limited | Information & communication | 2023 |
| Accu Europe Ltd | Extraterritorial | 2024 |
| Accu Group Limited | Financial services | 2024 |
| Accu Limited | Wholesale & retail | 2012 |
| Accuflow Commissioning Limited | Professional & scientific | 2008 |
| Accuri Business Support Limited | Administrative & support | 2023 |
| Ace and Hammer Developments Ltd | Construction | 2020 |
| Ace Care Comply Ltd | Professional & scientific | 2026 |
| Ace Clinic Podiatry Limited | Other services | 2020 |
| Ace Commercial Laundry Limited | Other services | 2018 |
| Ace Engineering & Reconditioners Ltd | Professional & scientific | 2025 |
| Ace HD2 Ltd | Wholesale & retail | 2024 |
| Acer Growth Partners Limited | Financial services | 2018 |
| Achievement TV Ltd | Manufacturing | 2013 |
| Achill Consultants Limited | Professional & scientific | 2026 |
| Achivo CIC | Wholesale & retail | 2026 |
| Achs Building Services Ltd | Construction | 2012 |
| Acimar Limited | Health & social care | 2010 |
| ACJ Housing Properties Limited | Real estate | 2025 |
| ACK Sports Ltd | Arts & recreation | 2020 |
| Acme Accident Management Ltd | Administrative & support | 2015 |
| Acorn and PIP Community CIC | Hospitality | 2025 |
| Acorn Cleaning Equipment Ltd | Wholesale & retail | 2012 |
| Acorn Houses Respite Ltd | Health & social care | 2023 |
| Acorn International Ltd | Wholesale & retail | 2020 |
| Acpt Limited | Other services | 2017 |
| Acrev Ltd | Wholesale & retail | 2025 |
| Across Country | Health & social care | 2004 |
| ACS Car Sales Ltd | Wholesale & retail | 2019 |
| ACT 2025 Holdings Ltd | Administrative & support | 2025 |
| Active Leisure Limited | Arts & recreation | 2007 |
| Active Personnel Recruitment Limited | Administrative & support | 2022 |
| Active Rainbow Enterprise CIC | Arts & recreation | 2022 |
| Active Rainbow Ltd | Education | 2021 |
| Active Social Care Limited | Administrative & support | 1992 |
| Active Sports Nutrition Supplies Ltd. | Wholesale & retail | 2003 |