| Air Sheriff (UK) Limited | Administrative & support | 2020 |
| Air Sheriff Services Limited | Professional & scientific | 2023 |
| Air Source Covers Ltd | Manufacturing | 2022 |
| Air Track Holdings Limited | Financial services | 2023 |
| Aircarerscompanion Ltd | Other services | 2026 |
| Aircon Holdings Limited | Financial services | 2025 |
| Aircon Maintenance Limited | Construction | 2021 |
| Aircraft Rentals Ltd | Administrative & support | 2022 |
| Airdrie Curry House Ltd | Hospitality | 2023 |
| Aire Bearings Limited | Wholesale & retail | 2003 |
| Aire Concrete Limited | Manufacturing | 2017 |
| Aire Electrical Ltd | Construction | 2023 |
| Aire Executive Search Limited | Administrative & support | 2025 |
| Aire GAS and Water Ltd | Construction | 2024 |
| Aire Global Group Limited | Information & communication | 2018 |
| Aire Global Limited | Professional & scientific | 2015 |
| Aire Group Ltd | Professional & scientific | 2016 |
| Aire Hand Car Wash Ltd | Wholesale & retail | 2025 |
| Aire Innovate Limited | Information & communication | 2022 |
| Aire Innovations Limited | Professional & scientific | 2021 |
| Aire Intelligent Technologies Limited | Information & communication | 2018 |
| Aire Investments Limited | Real estate | 2015 |
| Aire Logic EOT Limited | Extraterritorial | 2022 |
| Aire Logic Limited | Information & communication | 2007 |
| Aire Mills Bakery Ltd | Hospitality | 2022 |
| Aire Partners LLP | | 2005 |
| Aire Place Property Co. Limited | Real estate | 1960 |
| Aire Place Studios C.I.C. | Arts & recreation | 2016 |
| Aire Resilience Company C.I.C. | Professional & scientific | 2025 |
| Aire Valley Associates Limited | Construction | 2012 |
| Aire Valley Cooling Ltd | Manufacturing | 2020 |
| Aire Valley Fire Ltd | Public administration | 2026 |
| Aire Valley Rewinds Limited | Manufacturing | 2010 |
| Aire Valley Tree Services Limited | Agriculture & fishing | 2008 |
| Aire View Limited | Professional & scientific | 2021 |
| Aireborough Gymnastics Club Ltd | Arts & recreation | 2013 |
| Aireborough Skip Hire Leeds Ltd | Water & waste | 2025 |
| Aireborough Skip Hire Limited | Water & waste | 2007 |
| Aireborough Thai Boxing Limited | Arts & recreation | 2010 |
| Aireborough Voluntary Services to the Elderly (Avsed) | Health & social care | 2015 |
| Airebox Ltd | Financial services | 2007 |
| Airecon Limited | Other services | 2016 |
| Airedale Chemical Company Limited | Manufacturing | 1973 |
| Airedale Consulting Limited | Professional & scientific | 2025 |
| Airedale Environmental Systems Ltd | Extraterritorial | 2011 |
| Airedale Fleet Resources Limited | Financial services | 2014 |
| Airedale Flooring Contractors Limited | Construction | 2010 |
| Airedale Glass & Glazing Company Ltd. | Wholesale & retail | 1976 |
| Airedale Group Holdings Limited | Manufacturing | 2013 |
| Airedale House Limited | Real estate | 1925 |
| Airedale Hydraulics & Engineering Ltd | Wholesale & retail | 2011 |
| Airedale Locums Ltd | Health & social care | 2025 |
| Airedale Newco Limited | Financial services | 2023 |
| Airedale Precision Engineering Ltd | Professional & scientific | 2024 |
| Airedale Roofing and Maintenance Ltd | Construction | 2024 |
| Airedale View (Leeds) Management Company Limited | Households | 2006 |
| Airedrive Limited | Wholesale & retail | 2011 |
| Aireforge Limited | Wholesale & retail | 2016 |
| Aireshelta Products Limited | Administrative & support | 2019 |
| Aireside Limited | Real estate | 2020 |
| Airestream Ltd | Information & communication | 2026 |
| Airflow Experts Ltd | Construction | 2025 |
| Airflow Solutions Hvac Ltd | Construction | 2022 |
| Airflow Systems Ltd | Construction | 2013 |
| Airfoil Technologies International-Uk Ltd | Manufacturing | 1986 |
| Airforce Developments LLP | | 2015 |
| Airlink Management Limited | Real estate | 2022 |
| Airmed Private GP Ltd | Health & social care | 2025 |
| Airnow Technology Holdings Ltd | Financial services | 2023 |
| Airnow Technology Limited | Wholesale & retail | 2021 |
| Airpay Global Limited | Information & communication | 2019 |
| Airport Holdings NDH1 Limited | Professional & scientific | 2007 |
| Airshiply Limited | Wholesale & retail | 2025 |
| Airsoft Pyrotechnics Ltd | Wholesale & retail | 2025 |
| Airsprung Furniture Limited | Manufacturing | 1980 |
| Airsprung Group PLC | Professional & scientific | 1976 |
| Airtight International Limited | Manufacturing | 1998 |
| Airtime Aviation Software Limited | Information & communication | 2024 |
| Airtronix Environmental Design Limited | Professional & scientific | 2023 |
| Airvert Limited | Wholesale & retail | 1992 |
| Airy Properties Ltd | Real estate | 2018 |
| Aiscale Ltd | Information & communication | 2024 |
| Aisha Catering Ltd | Hospitality | 2022 |
| Aisha Kany Ltd | Health & social care | 2016 |
| Aisha's Cafe Limited | Hospitality | 2020 |
| Aisling Properties Limited | Real estate | 2021 |
| Aisling Psychotherapies Ltd | Health & social care | 2023 |
| Aitch & Haitch Limited | Wholesale & retail | 2018 |
| Aitken's Sportsturf Limited | Agriculture & fishing | 1996 |
| Aivaras Griksas Ltd | Transport & logistics | 2023 |
| Aivj Limited | Hospitality | 2025 |
| Aiyara Partners Ltd | Administrative & support | 2025 |
| AIZ Energy Ltd | Real estate | 2021 |
| Aize Operations UK Limited | Information & communication | 2024 |
| AJ & CS Holdings Ltd | Real estate | 2022 |
| AJ 19 Design Limited | Professional & scientific | 2025 |
| AJ Afrocaribbean Food & VEG Ltd | Hospitality | 2019 |
| AJ and Ivory Ltd | Other services | 2023 |
| AJ Asociatii Limited | Administrative & support | 2021 |
| AJ Barbers (Horsforth) Ltd | Other services | 2022 |