| Agile Box Ltd | Administrative & support | 2012 |
| Agile Developments Group Ltd | Information & communication | 2021 |
| Agile IT & Management Consults Limited | Information & communication | 2016 |
| Agile Property Partners Limited | Real estate | 2015 |
| Agile Way Today Limited | Information & communication | 2015 |
| Agiledm Ltd | Professional & scientific | 2017 |
| Agilityrpo Limited | Administrative & support | 2024 |
| Agimar Property Ltd | Real estate | 2025 |
| AGL Mortgage & Protection Ltd | Financial services | 2019 |
| AGL Scaffolding Limited | Construction | 2016 |
| AGM Express Ltd | Transport & logistics | 2015 |
| AGM Farms Limited | Real estate | 2020 |
| AGO Logistics Ltd | Wholesale & retail | 2012 |
| Agora Clothing Ltd | Wholesale & retail | 2013 |
| AGP Window Cleaning Limited | Administrative & support | 2021 |
| AGR Autos Ltd | Wholesale & retail | 2015 |
| AGR Consulting Limited | Information & communication | 1997 |
| Agri Controls Ltd | Manufacturing | 2019 |
| Agriaux Limited | Wholesale & retail | 2011 |
| Agricultural and Commercial Investments Limited | Real estate | 1998 |
| Agricultural Asset Management Limited | Financial services | 2014 |
| Agricultural Holdings (Norfolk) Limited | Real estate | 2024 |
| Agrido Ltd | Manufacturing | 2023 |
| Agridrone Ltd | Agriculture & fishing | 2025 |
| Agrielec Ltd | Manufacturing | 2019 |
| Agriflow Solutions Ltd | Manufacturing | 2025 |
| Agriglass Ltd | Professional & scientific | 2003 |
| Agriglaze Limited | Manufacturing | 2002 |
| Agriledger 2020 UK Ltd | Information & communication | 2019 |
| Agrispan Ltd | Wholesale & retail | 2025 |
| Agritech Consultancy Limited | Professional & scientific | 2018 |
| Agritech Innovations Ltd | Manufacturing | 2024 |
| Agro Atlantic Limited | Wholesale & retail | 2022 |
| AGS Retail Limited | Wholesale & retail | 2016 |
| Agseer Ltd | Information & communication | 2024 |
| Agyra Ltd | Professional & scientific | 2026 |
| AH Health & Care Limited | Wholesale & retail | 2026 |
| AH Heating and Plumbing Ltd | Construction | 2020 |
| AH Home Surveys Limited | Professional & scientific | 2025 |
| AHA Prodev Ltd | Real estate | 2024 |
| Ahdm Healthcare Ltd | Health & social care | 2016 |
| AHI Bidco Limited | Extraterritorial | 1990 |
| AHI Group Limited | Construction | 2017 |
| AHL Services (Midlands) Limited | Financial services | 2021 |
| Ahmed & ALI Ltd | Real estate | 2019 |
| Ahsan's Pizza Shop Ltd | Hospitality | 2019 |
| Ahsd Limited | Hospitality | 2017 |
| AI & Commerce Solutions Ltd | Wholesale & retail | 2025 |
| AI Find Ltd | Professional & scientific | 2026 |
| AI Fleet Ltd | Construction | 2008 |
| AI Ophthalmology Ltd | Health & social care | 2026 |
| Aic-Hub Ltd | Professional & scientific | 2025 |
| Aica Ltd | Construction | 2022 |
| AID Alliance | Other services | 2025 |
| Aidam Strategic Partners Limited | Professional & scientific | 2025 |
| Aidos Limited | Information & communication | 2025 |
| Aidulce Aviation Services Limited | Transport & logistics | 2019 |
| AIK Transport Services Ltd | Transport & logistics | 2021 |
| AIM Advanced Mobility Ltd | Professional & scientific | 2025 |
| AIM Healing Ltd | Health & social care | 2018 |
| AIM High Chiropractic Limited | Health & social care | 2025 |
| AIM High Web Design Ltd | Information & communication | 2013 |
| AIM Skills Development Limited | Education | 2010 |
| Air Anglia Aerospace Limited | Manufacturing | 2006 |
| Air Cair Holdings Limited | Financial services | 2016 |
| Air Works Aviation Services UK Limited | Financial services | 2018 |
| Air Works Empire UK Limited | Transport & logistics | 2012 |
| Air Works UK Engineering Limited | Transport & logistics | 2009 |
| Aireville Associates Limited | Professional & scientific | 2016 |
| Airgunmounts Ltd | Manufacturing | 2024 |
| Airide Limited | Manufacturing | 2019 |
| Airnorfolk Ltd | Hospitality | 2019 |
| Airport Carcare (Norwich) Ltd | Wholesale & retail | 2003 |
| Airport MOT Centre Ltd | Wholesale & retail | 2007 |
| Airride Ltd | Manufacturing | 2025 |
| Airstream Facilities Ltd | Administrative & support | 2011 |
| Aish Bakery Ltd | Manufacturing | 2023 |
| Aissistance Ltd | Administrative & support | 2024 |
| Aitechgreen Ltd | Energy | 2026 |
| Aivana Intelligence Limited | Information & communication | 2026 |
| AJ Bridge Kabab Ltd | Hospitality | 2025 |
| AJ Care Solution Ltd | Health & social care | 2025 |
| AJ Chapman Garden Services Ltd | Administrative & support | 2013 |
| AJ Ghar Property Ltd | Real estate | 2026 |
| AJ Lettings NFK Ltd | Real estate | 2023 |
| AJ Lifting Solutions Ltd | Construction | 2012 |
| AJ Psychology and Therapeutic Practice Ltd | Health & social care | 2024 |
| AJ Retailers Ltd | Wholesale & retail | 2018 |
| AJ Shum Consulting Limited | Financial services | 2010 |
| AJ Sons Ltd | Wholesale & retail | 2025 |
| AJ Thirteen Limited | Professional & scientific | 2018 |
| AJ Trading Group Ltd | Professional & scientific | 2020 |
| AJ Tripp Consultancies Ltd | Health & social care | 2022 |
| AJA EOT Limited | Extraterritorial | 2024 |
| AJA Office Supplies Limited | Wholesale & retail | 2019 |
| Ajantis Art Ltd | Professional & scientific | 2025 |
| AJB Events and Entertainment Limited | Administrative & support | 2025 |
| AJC Norfolk Limited | Construction | 2024 |
| Ajcustoms Ltd | Wholesale & retail | 2025 |
| AJD Consultants Limited | Professional & scientific | 2007 |