| Ahsam Holdings Ltd | Real estate | 2019 |
| Ahsanlo Ltd | Wholesale & retail | 2021 |
| Ahsm Holdings Limited | Real estate | 2019 |
| AHY Foods Ltd | Hospitality | 2023 |
| AHY2 Foods Ltd | Hospitality | 2025 |
| AI & IA Ltd | Health & social care | 2023 |
| AI Associates Yorkshire Ltd | Professional & scientific | 2023 |
| AI City Properties Ltd | Real estate | 2025 |
| AI Comercio Ltd | Wholesale & retail | 2025 |
| AI Comms Solutions Ltd | Information & communication | 2025 |
| AI Complex Constructions Ltd | Construction | 2024 |
| AI Courier & Logistics Ltd | Transport & logistics | 2025 |
| AI in the Workplace Ltd | Administrative & support | 2019 |
| AI Pharma Limited | Wholesale & retail | 2021 |
| AI Sales Ltd | Professional & scientific | 2025 |
| AI Signs Ltd | Manufacturing | 2026 |
| AI Skin Art Ltd | Wholesale & retail | 2023 |
| AI Titans Network Limited | Information & communication | 2025 |
| Ai&Zi Property Ltd | Households | 2025 |
| AIA 7 Holdings Limited | Administrative & support | 2026 |
| AIA 7 Investments Limited | Administrative & support | 2026 |
| AIB Travel Ltd | Transport & logistics | 2026 |
| Aidan Property Management Ltd | Real estate | 2019 |
| Aidan Security Ltd | Information & communication | 2019 |
| Aiden 12 Limited | Wholesale & retail | 2022 |
| AIE Ltd | Other services | 2026 |
| AIG B2B Logistics Ltd | Transport & logistics | 2025 |
| Aikjanic Ltd | Professional & scientific | 2025 |
| Ailyia Foods Ltd | Manufacturing | 2025 |
| AIM 4 Performance Ltd | Professional & scientific | 2025 |
| Aimfx Ltd | Financial services | 2026 |
| Aimh Ltd | Wholesale & retail | 2026 |
| Aimk Limited | Financial services | 2017 |
| Ainfinite Ltd | Financial services | 2025 |
| Ainsbury Micropub Ltd | Hospitality | 2026 |
| Ainslie Delivery Service Limited | Transport & logistics | 2025 |
| Aiqahs Boutique Ltd | Wholesale & retail | 2018 |
| Aiqahs Boutique Nelson Ltd | Wholesale & retail | 2017 |
| Aiqahs Bridal Ltd | Wholesale & retail | 2021 |
| Aiqahs Limited | Wholesale & retail | 2024 |
| Air Conditioning Inspection Solutions Ltd | Professional & scientific | 2016 |
| Aira Abayas Ltd | Wholesale & retail | 2025 |
| Aira Zahra Ltd | Wholesale & retail | 2025 |
| Airb 4 ME Ltd | Real estate | 2016 |
| Aire Consultants Limited | Professional & scientific | 2023 |
| Aire Gymnastics Club Ltd | Arts & recreation | 2025 |
| Aire Music CIC | Arts & recreation | 2025 |
| Aire Valley Forge Keighley Limited | Manufacturing | 2024 |
| Aire Valley Forge Limited | Manufacturing | 2010 |
| Aire Valley GAS Limited | Water & waste | 1983 |
| Aire Valley Homes Limited | Construction | 2014 |
| Aire Valley House Ltd | Other services | 2021 |
| Aire Valley Insulation and Contracting Ltd | Construction | 2023 |
| Aire Valley Lift Service & Repair Limited | Manufacturing | 2015 |
| Aire Valley Transport Limited | Transport & logistics | 2013 |
| Aire Valley Worktops Ltd | Wholesale & retail | 2018 |
| Airedale and Pennine Motor Car Club Ltd | Arts & recreation | 2015 |
| Airedale Carpets Limited | | 1973 |
| Airedale Catering Equipment Group Limited | Professional & scientific | 2012 |
| Airedale Catering Equipment Limited | Manufacturing | 1985 |
| Airedale Cooling Services Limited | Manufacturing | 1991 |
| Airedale Fencing Ltd | Construction | 2018 |
| Airedale House Management Company Limited | Real estate | 2015 |
| Airedale Installations Ltd | Construction | 2020 |
| Airedale Investment Limited | Real estate | 1935 |
| Airedale Park Estate Limited | Hospitality | 2024 |
| Airedale Recycling Management Ltd | Water & waste | 2018 |
| Airedale Technical Services Limited | Manufacturing | 1994 |
| Aireview Stores Ltd | Wholesale & retail | 2011 |
| Aireville Rise (Frizinghall) Management Limited | Households | 1987 |
| Airport Precise Loading Systems Ltd | Transport & logistics | 2024 |
| Aish Transport Limited | Transport & logistics | 2025 |
| Aishaesthetics Ltd | Extraterritorial | 2021 |
| Aisr Investments Ltd | Health & social care | 2019 |
| Aitec Limited | Professional & scientific | 2015 |
| Aitechfam Ltd | Information & communication | 2025 |
| AIZ Cars Ltd | Administrative & support | 2019 |
| Aizak Deen Ltd | Transport & logistics | 2025 |
| Aizal Zahra Ltd | Wholesale & retail | 2025 |
| Aiélashes Ltd | Wholesale & retail | 2025 |
| AJ & Co Global Ltd | Hospitality | 2026 |
| AJ Bargains Limited | Transport & logistics | 2019 |
| AJ BUT Properties Ltd | Real estate | 2026 |
| AJ Community Care Ltd | Health & social care | 2025 |
| AJ Global Teacher Recruitment Ltd | Administrative & support | 2026 |
| AJ Golden Crust Bakery Ltd | Manufacturing | 2025 |
| AJ Home Supplies Ltd | Wholesale & retail | 2024 |
| AJ Japan Motors Ltd | Wholesale & retail | 2023 |
| AJ Kitchen and Bathrooms Ltd | Construction | 2025 |
| AJ Lettings and Management Ltd | Real estate | 2019 |
| AJ Maintenance Ltd | Wholesale & retail | 2018 |
| AJ Media Services Ltd | Manufacturing | 2023 |
| AJ Optical Limited | Health & social care | 2017 |
| AJ Services Yorkshire Ltd | Other services | 2018 |
| AJ93 Limited | Wholesale & retail | 2023 |
| AJA Sweets Ltd | Hospitality | 2019 |
| Ajav Pharms Ltd | Health & social care | 2024 |
| Ajct Inc Ltd | Wholesale & retail | 2025 |
| Ajfbei Ltd | Administrative & support | 2019 |
| AJG Glazing Limited | Construction | 2020 |