| Adams Estates and Lettings Limited | Real estate | 2015 |
| Adams Food Services Ltd | Wholesale & retail | 2018 |
| Adams Foods Ltd | Hospitality | 2023 |
| Adams Housing (Holdings) Limited | Financial services | 2010 |
| Adams Housing Management Ltd | Real estate | 2024 |
| Adams Hydraulics Limited | Manufacturing | 2025 |
| Adams Law Solicitors Ltd | Professional & scientific | 2026 |
| Adams Perry Limited | Professional & scientific | 2002 |
| Adams Property Group Limited | Real estate | 2022 |
| Adams Stores Limited | Wholesale & retail | 2024 |
| Adams Transport Solution Ltd | Transport & logistics | 2024 |
| ADAMS001 Ltd | Wholesale & retail | 2018 |
| ADAMS1 Limited | Hospitality | 2026 |
| Adamsflow Ltd | Transport & logistics | 2025 |
| Adamson Jones IP Limited | Professional & scientific | 2010 |
| Adamsons Law Associates Limited | Professional & scientific | 2014 |
| Adamza Business Services Limited | Construction | 2011 |
| Adam’S Construction Limited | Construction | 2025 |
| Adan TM Services Ltd | Construction | 2023 |
| Adap UK Limited | Health & social care | 2026 |
| Adapt Accountancy and Business Solutions Ltd | Professional & scientific | 2019 |
| Adapt ED AP Limited | Education | 2025 |
| Adapt Marketing Limited | Professional & scientific | 2018 |
| Adapt Networks Ltd | Construction | 2013 |
| Adapt Workspace AI Limited | Information & communication | 2025 |
| ADAPT365 Strategy Consultants Ltd | Professional & scientific | 2021 |
| Adaptable Design Co (UK) Ltd | Information & communication | 2013 |
| Adaptable Interim Solutions Limited | Professional & scientific | 2016 |
| Adaptit S.A. Ltd | Wholesale & retail | 2023 |
| Adaptive Minds OT Services Limited | Health & social care | 2025 |
| Adaptly AI Ltd | Information & communication | 2026 |
| Adara Beauty Limited | Health & social care | 2010 |
| Adarra Ltd | Wholesale & retail | 2024 |
| Adas Housing Ltd | Real estate | 2024 |
| Adasoft Ltd | Information & communication | 2023 |
| Adassa Dawn's Ltd | Health & social care | 2009 |
| Adassa’S Waxing Salon Ltd | Administrative & support | 2016 |
| Adav Limited | Health & social care | 2016 |
| Adax Properties Limited | Real estate | 2026 |
| Adaz Tyres Ltd | Wholesale & retail | 2023 |
| ADB and Partners Limited | Financial services | 2023 |
| ADB Residential Ltd | Real estate | 2021 |
| Adbd Management Limited | Professional & scientific | 2018 |
| Adbridge Estate Management Limited | Real estate | 2021 |
| ADC Hire Limited | Administrative & support | 2020 |
| ADC Learning Ltd | Wholesale & retail | 2024 |
| ADC Recruitment Limited | Administrative & support | 2025 |
| ADC Transport London Limited | Transport & logistics | 2026 |
| Adcom Grant Limited | Administrative & support | 2019 |
| Adcon Holdings Limited | Professional & scientific | 1961 |
| ADD Fire Solutions Limited | Public administration | 2022 |
| Addage Limited | Administrative & support | 2008 |
| Added Edge Consulting Limited | Information & communication | 2025 |
| Added Edge Ltd | Information & communication | 2012 |
| Addelice Limited | Administrative & support | 2008 |
| Addendx Ltd | Information & communication | 2026 |
| Adderbury Fields Management Company Limited | Households | 2015 |
| Adderley Alarms Ltd | Construction | 2021 |
| Addeyannie Limited | Professional & scientific | 2015 |
| Addict Traders Ltd | Wholesale & retail | 2019 |
| Addictive Mode Limited | Wholesale & retail | 2017 |
| Addictive Productions Ltd | Arts & recreation | 2021 |
| Addienix Digital Group Limited | Wholesale & retail | 2025 |
| Adding Knowledge Limited | Administrative & support | 2015 |
| Addison Aaron (Birmingham) Limited | Professional & scientific | 2009 |
| Addison Road Garage Limited | Wholesale & retail | 2018 |
| Additional Curates Society | Information & communication | 1932 |
| Address Residential Ltd | Real estate | 2025 |
| Addressing Addictions Limited | Health & social care | 2020 |
| Adducere LLP | | 2009 |
| ADE Heritage Afro-Caribbean Superstore Limited | Wholesale & retail | 2024 |
| ADE Holt Enterprises Limited | Information & communication | 2013 |
| Adeadeyuk Ltd | Transport & logistics | 2019 |
| Adebal Property Limited | Real estate | 2025 |
| Adeboy Limited | Wholesale & retail | 2023 |
| Adebukola Limited | Other services | 2013 |
| Adeclem Enterprises Ltd. | Health & social care | 2016 |
| Adecyn Care Services Ltd | Professional & scientific | 2006 |
| Aded Property Ltd | Real estate | 2025 |
| Adeel Akhtar Ltd | Financial services | 2018 |
| Adeel Couriers Ltd | Transport & logistics | 2024 |
| Adefem Concepts Solutions Ltd | Administrative & support | 2025 |
| Adegboyega Limited | Real estate | 2023 |
| Adekins Ltd | Administrative & support | 2022 |
| Adekoya & Olumuyiwa Limited | Wholesale & retail | 2025 |
| Adel and Sons Estates Limited | Real estate | 2024 |
| Adelaine Beauty Ltd | Other services | 2019 |
| Adelio Marketing Limited | Wholesale & retail | 2018 |
| Adelphi Films Limited | Information & communication | 1939 |
| Ademar Logistics Ltd | Transport & logistics | 2025 |
| Aden Butchers Limited | Wholesale & retail | 2024 |
| Aden Property Solutions Limited | Real estate | 2025 |
| Aden Trading Ltd | Wholesale & retail | 2022 |
| Aden Travels Ltd | Administrative & support | 2025 |
| Adept Housing Ltd | Households | 2019 |
| Adept Trading Limited | Wholesale & retail | 2015 |
| Adept Valeting Ltd | Wholesale & retail | 2022 |
| Adeptio Corp Ltd | Professional & scientific | 2025 |
| Aderant Legal (UK) Limited | Information & communication | 2004 |
| Adeseal Limited | Professional & scientific | 2013 |