| AFG Ltd | Construction | 2021 |
| Afghan Catering & Cuisine Limited | Hospitality | 2026 |
| Afghan Cuisine & Catering Limited | Hospitality | 2025 |
| Afghan Palace Ltd | Hospitality | 2023 |
| Afghan Zaiqa Ltd | Hospitality | 2025 |
| AFH Ltd | Transport & logistics | 2018 |
| Afifi Estates Ltd | Real estate | 2024 |
| Afilos Ltd | Other services | 2024 |
| AFK Express Ltd | Wholesale & retail | 2025 |
| AFKO2 Benefits Ltd | Administrative & support | 2023 |
| Aflp.Com Ltd | Wholesale & retail | 2023 |
| Afluencr Ltd | Professional & scientific | 2019 |
| AFN Consultancy Ltd | Professional & scientific | 2019 |
| Afolabiit Limited | Information & communication | 2009 |
| Afon Design Ltd. | Professional & scientific | 2020 |
| Afon IT Limited | Information & communication | 2023 |
| Afortis Group PC | | 2017 |
| Africa Connect Limited | Wholesale & retail | 2018 |
| Africa Economic Forum | Extraterritorial | 2019 |
| Africa Geographic Ltd | Information & communication | 2020 |
| Africa Legal Risk Control Ltd | Extraterritorial | 2015 |
| Africa Rabbit Co., Limited | Extraterritorial | 2021 |
| Africa Traders UK Limited | Wholesale & retail | 2015 |
| Africa United for Democracy and Good Governance Ltd | Other services | 2025 |
| Africa Web Commerce Ltd | Information & communication | 2022 |
| Africa Welsh News CIC | Information & communication | 2015 |
| African Castle Investments Ltd | Real estate | 2021 |
| African Minerals Ventures Ltd | Administrative & support | 2017 |
| African Ventures and Assets (Afriva) Limited | Financial services | 2016 |
| Africanus World Ltd | Professional & scientific | 2020 |
| Africaqueen Group Ltd | Other services | 2019 |
| Afrilion Ltd | Wholesale & retail | 2017 |
| Afrissance Consulting Limited | Information & communication | 2018 |
| Afrls Benefits Ltd | Professional & scientific | 2022 |
| Afro Hair & Beauty Education Ltd | Education | 2026 |
| Afro Kicks UK Ltd | Wholesale & retail | 2019 |
| Afrobizcym Ltd | Households | 2025 |
| Afrokan Ltd | Other services | 2020 |
| Afrowales CIC | Other services | 2026 |
| AFT Elite Construction Ltd | Construction | 2025 |
| AFT Garage Ltd | Financial services | 2021 |
| AFT Recycling Limited | Water & waste | 2026 |
| Afta Eats Camden Ltd | Hospitality | 2019 |
| Afta Eats Wembley Ltd | Hospitality | 2019 |
| Afyonrenew Ltd | Wholesale & retail | 2025 |
| AFZ Ltd | Transport & logistics | 2025 |
| AG Enterprises London Ltd | Transport & logistics | 2018 |
| AG Market Limited | Information & communication | 2020 |
| AG Momentum Ltd | Wholesale & retail | 2024 |
| AGA Acquisitions Ltd | Real estate | 2026 |
| AGA Heritage Conservation Limited | Construction | 2022 |
| Agafay Ltd | Hospitality | 2024 |
| Again Ltd | Manufacturing | 2026 |
| Against the Grain Coffee House Ltd | Hospitality | 2019 |
| Against the Odds Limited | Health & social care | 2018 |
| Agamemnon House (Milford Haven) Management Limited | Real estate | 2003 |
| Agape OH Production Limited | Information & communication | 2019 |
| Agape-Pragma Counselling Ltd | Professional & scientific | 2025 |
| Agarstore Ltd | Wholesale & retail | 2023 |
| Agcadam Ltd | Wholesale & retail | 2023 |
| AGD Amusements Ltd | Arts & recreation | 2010 |
| AGD Enterprises Limited | Information & communication | 2019 |
| AGE Concern Partnership Wales Limited | Professional & scientific | 2010 |
| AGE Connects Cardiff and the Vale Ltd | Other services | 2010 |
| AGE Cymru | Professional & scientific | 2009 |
| AGE Cymru Trading Limited | Wholesale & retail | 2012 |
| Ageas Law LLP | | 2012 |
| Agencee Ltd | Hospitality | 2026 |
| Agencyflux Ltd | Information & communication | 2025 |
| Agenda Commerce Ltd | Wholesale & retail | 2018 |
| Agent 747 Ltd | Hospitality | 2019 |
| Agent Auto Ltd | Professional & scientific | 2015 |
| Agent Online Marketeer Ltd | Professional & scientific | 2023 |
| Agentix Ltd | Wholesale & retail | 2025 |
| Agentos Proptech Group Ltd | Information & communication | 2005 |
| Agera Capital Ltd | Professional & scientific | 2021 |
| Agewise Medicolegal Experts Ltd | Health & social care | 2025 |
| AGF Care Homes Ltd | Hospitality | 2023 |
| Aggb Properties Limited | Real estate | 2016 |
| Aggerro Digital Group Ltd | Information & communication | 2022 |
| Aggpo Int'L Limited | Extraterritorial | 2016 |
| Aggyfuffandme Limited | Other services | 2024 |
| AGH Cardiff Ltd | Real estate | 2021 |
| Aghp Management Limited | Extraterritorial | 2021 |
| Agig Investments Limited | Households | 2025 |
| Agile Health Group Ltd | Other services | 2022 |
| Agile in Work Ltd | Health & social care | 2020 |
| Agile Lets Ltd | Households | 2018 |
| Agile Project Resources Ltd | Other services | 2019 |
| Agile Without Borders Ltd | Construction | 2022 |
| AGILE451 Ltd | Information & communication | 2020 |
| Agileba Ltd | Information & communication | 2025 |
| Agilify Maritime Services Ltd | Professional & scientific | 2025 |
| Agilis Consultancy Ltd | Professional & scientific | 2018 |
| Agilitas Consulting Services Ltd | Information & communication | 2015 |
| Agilo Limited | Financial services | 2006 |
| Agincourt Capital Ltd | Real estate | 1999 |
| AGL Hire Solutions Ltd | Administrative & support | 2017 |
| AGM Brickwork & Stonework Limited | Construction | 2003 |
| Agme Solutions Limited | Professional & scientific | 2016 |