| Airdenair Hotel Limited | Hospitality | 2017 |
| Airdreamer Limited | Households | 2025 |
| Airds & Co Limited | Professional & scientific | 2008 |
| Airds Capital Limited | Real estate | 2018 |
| Airds Property Company Ltd | Professional & scientific | 2019 |
| Aire Spaces Limited | Real estate | 2023 |
| Airestop Limited | Information & communication | 2021 |
| Airground International LP | | 2015 |
| Airgroup Limited LP | | 2018 |
| Airgsm UK Limited | Information & communication | 2025 |
| Airjack Limited | Real estate | 2023 |
| Airlie Consultancy Ltd | Administrative & support | 2022 |
| Airlink Travel (EDI) Limited | Administrative & support | 2018 |
| Airmeter Ltd | Information & communication | 2025 |
| Airnode Limited | Information & communication | 2017 |
| Airo Games Ltd. | Information & communication | 2017 |
| Airon.Space LP | | 2024 |
| Airsell Company LP | | 2016 |
| Airservice Associates | | 1991 |
| Airsys Integrated Solutions (International) Limited | Professional & scientific | 2021 |
| Airtech Associates LP | | 2017 |
| Airtel Solutions LP | | 2014 |
| Airthrey Mill Company Limited | Administrative & support | 2001 |
| Airthrey Mill Property Company Limited | Real estate | 2019 |
| Airtily Ltd | Professional & scientific | 2020 |
| AIS Fire and Security Limited | Other services | 2019 |
| AIS Noble LP | | 2015 |
| AIS Security Systems Ltd | Other services | 2017 |
| Aisar Ltd | Extraterritorial | 2010 |
| Aisckop Technologies Ltd | Information & communication | 2025 |
| Aisling Capital Ventures Limited | Real estate | 2018 |
| Aisling Developments Limited | Real estate | 2000 |
| Aisling International LP | | 2018 |
| Aispeake Limited | Information & communication | 2017 |
| Aitchison & Colegrave Trustees Limited | Professional & scientific | 1995 |
| Aitchison SLP | | 1996 |
| Aite Hub Ltd | Wholesale & retail | 2024 |
| Aiten Ltd | Construction | 2021 |
| Aithrie Limited | Agriculture & fishing | 2012 |
| Aitken Consultancy and Coaching Limited | Professional & scientific | 2014 |
| Aitken Design Limited | Manufacturing | 2020 |
| Aitken Laboratories Limited | Professional & scientific | 1986 |
| Aitken Limited | Real estate | 2016 |
| AIX Trou Belle & Stryfe ET Filles Ltd | Other services | 2024 |
| Aix-Ray Limited | Information & communication | 2026 |
| Aixiliary Ltd | Professional & scientific | 2026 |
| Aiya Ltd | Hospitality | 2025 |
| Aiza Ayat Enterprise Ltd | Wholesale & retail | 2021 |
| Aizel LP | | 2015 |
| Aizle Restaurants Ltd. | Hospitality | 2013 |
| AJ Edinburgh Ltd | Wholesale & retail | 2026 |
| AJ Event Alchemy Ltd | Professional & scientific | 2014 |
| AJ Flips Ltd | Wholesale & retail | 2026 |
| AJ Garden Care Ltd | Professional & scientific | 2026 |
| AJ Global Pathways Ltd | Education | 2025 |
| AJ Heating Plumbing and Home Services Ltd | Construction | 2022 |
| AJ House Lets Ltd | Real estate | 2020 |
| AJ Impact LP | | 2023 |
| AJ Lyon Limited | Professional & scientific | 2008 |
| AJ Premium Limited | Wholesale & retail | 2024 |
| AJ Projects Ltd | Administrative & support | 2020 |
| AJ Taxi Ltd | Transport & logistics | 2025 |
| AJ Unit Limited | Information & communication | 2010 |
| Aj&Jp Ltd | Real estate | 2025 |
| Ajaf Medical Ltd | Health & social care | 2022 |
| Ajags (Scotland) Limited | Financial services | 2018 |
| Ajas Property Services Ltd | Real estate | 2026 |
| AJB Building & Joinery Ltd | Construction | 2024 |
| Ajct Properties Ltd | Real estate | 2021 |
| AJCX2@60 Ltd. | Other services | 2019 |
| Ajesto Services LP | | 2016 |
| AJH Consulting Ltd | Professional & scientific | 2016 |
| AJI Research Ltd | Information & communication | 2025 |
| Ajinomoto Trading Holdings LP | | 2018 |
| AJJ1 Ltd | Administrative & support | 2026 |
| AJK Frozen Foods Ltd | Hospitality | 2024 |
| AJK Sadozai Limited | Transport & logistics | 2022 |
| AJL Marketing Limited | Professional & scientific | 2017 |
| AJL Well-Being Ltd | Other services | 2020 |
| AJM Construction Consultancy Limited | Professional & scientific | 2020 |
| AJM Edinburgh Ltd | Wholesale & retail | 2019 |
| AJM Properties Holdings Ltd | Real estate | 2023 |
| Ajocin Engineering Services Limited | Extraterritorial | 1998 |
| Ajoon Ltd | Wholesale & retail | 2026 |
| AJP Technology Consulting Ltd | Information & communication | 2015 |
| AJQ Property Management Limited | Real estate | 2019 |
| Ajrcj Investments Limited | Other services | 2024 |
| AJS Consultancy Limited | Professional & scientific | 2026 |
| AJS Electrical Solutions Ltd | Construction | 2015 |
| AJS Trading Group Ltd | Wholesale & retail | 2026 |
| Ajslp 40 | | 1999 |
| AJSLP1 | | 1997 |
| AJSLP10 | | 1997 |
| AJSLP11 | | 1997 |
| AJSLP12 | | 1997 |
| AJSLP14 | | 1997 |
| AJSLP15 | | 1997 |
| AJSLP16 | | 1997 |
| AJSLP17 | | 1997 |
| AJSLP18 | | 1997 |