| Aintree Initiatives for Performing Arts CIC | Education | 2024 |
| Aintree Interiors Limited | Wholesale & retail | 2017 |
| Aintree Kidz Limited | Health & social care | 2022 |
| Aintree Kitchens Ltd | Manufacturing | 2012 |
| Aintree Lifting Ltd | Construction | 2022 |
| Aintree Loco Limited | Manufacturing | 2014 |
| Aintree Ltd | Construction | 2025 |
| Aintree Motor Cycle Racing Club Limited | Arts & recreation | 1985 |
| Aintree Motors Limited | Wholesale & retail | 2006 |
| Aintree Plastics Limited | Manufacturing | 1995 |
| Aintree Properties Ltd | Real estate | 2021 |
| Aintree Property Ltd | Real estate | 2018 |
| Aintree Property Managment Ltd. | Real estate | 2014 |
| Aintree Racecourse Company Limited | Extraterritorial | 1982 |
| Aintree Racecourse Developments Limited | Arts & recreation | 2006 |
| Aintree Rendering Limited | Construction | 2020 |
| Aintree Renovations Ltd | Construction | 2025 |
| Aintree School of Music Ltd | Education | 2012 |
| Aintree Scrap Recyclers Limited | Water & waste | 2015 |
| Aintree Service Centre Ltd | Wholesale & retail | 2008 |
| Aintree Sofa's Limited | Wholesale & retail | 2015 |
| Aintree Storage Limited | Extraterritorial | 2024 |
| Aintree Trade Ltd | Wholesale & retail | 2025 |
| Aintree Training Limited | Education | 2021 |
| Aion Enterprises Ltd | Wholesale & retail | 2024 |
| Air Accommodation Limited | Hospitality | 2017 |
| Air Activity Ltd | Administrative & support | 2022 |
| Air and Fire Compliance Limited | Manufacturing | 2010 |
| Air and Fire Services Limited | Manufacturing | 2018 |
| Air BNB Lodging Ltd | Hospitality | 2022 |
| Air Compressors and Components Limited | Manufacturing | 2024 |
| Air Controls and Compressors Ltd | Manufacturing | 1982 |
| Air Highness Occasions Ltd | Arts & recreation | 2024 |
| Air Host and Clean Ltd | Administrative & support | 2018 |
| Air Host and Learn Ltd | Education | 2020 |
| Air Pilates Ltd | Arts & recreation | 2026 |
| Air Snowdonia Limited | Construction | 2022 |
| Air Traffic Control Services Limited | Administrative & support | 2012 |
| Air-Walker Limited | Professional & scientific | 2023 |
| Aircare Air Conditioning Ltd | Other services | 2004 |
| Airfibrex Ltd | Information & communication | 2025 |
| Airforms Limited | Manufacturing | 2017 |
| Airgon Installations Ltd | Construction | 2023 |
| Airgon Ipco Ltd | Professional & scientific | 2024 |
| Airgon Technologies Ltd | Manufacturing | 2022 |
| Airmass Limited | Professional & scientific | 2023 |
| Airoseal Limited | Extraterritorial | 2008 |
| Airplus (Renewables) Xeva Limited | Professional & scientific | 2025 |
| Airplus (Renewables) Xkorost Limited | Professional & scientific | 2025 |
| Airplus (Renewables) Xyqua Limited | Professional & scientific | 2025 |
| Airplus Renewables Ltd | Professional & scientific | 2019 |
| Airsource Heat Pump Services Ltd | Professional & scientific | 2025 |
| Airsys (UK) Limited | Manufacturing | 2012 |
| Airtech Cooling Services Ltd | Construction | 2001 |
| Airtight Sealant Process Limited | Extraterritorial | 2008 |
| Airtight Solutions Limited | Extraterritorial | 2008 |
| Airwise Pneumatics Ltd | Manufacturing | 1999 |
| Aisgo Property Limited | Real estate | 2016 |
| Aisha Welfare Trust | Health & social care | 2007 |
| Aishuwaryam (UK) Ltd | Wholesale & retail | 2024 |
| AIT Sona Ltd | Real estate | 2023 |
| Aitken Studio Ltd | Professional & scientific | 2024 |
| Aivesta Ltd | Financial services | 2024 |
| AJ AC Northwest Ltd | Energy | 2021 |
| AJ Data Ltd | Construction | 2024 |
| AJ Electrical Energy Ltd | Construction | 2016 |
| AJ Forrester Electrical Limited | Construction | 2023 |
| AJ Group (Europe) Ltd | Administrative & support | 2024 |
| AJ Industrial Services Ltd | Professional & scientific | 2024 |
| AJ Lynam Consultants Limited | Wholesale & retail | 2011 |
| AJ Moon Property Ltd | Real estate | 2018 |
| AJ Moore Property Limited | Real estate | 2025 |
| AJ Murray Developments Ltd | Construction | 2025 |
| AJ Parsons Ltd | Arts & recreation | 2019 |
| AJ Plastering Solutions Ltd | Construction | 2024 |
| AJ Properties (NW) Limited | Real estate | 2025 |
| AJ Property (NW) LLP | | 2012 |
| AJ Property Limited | Real estate | 2015 |
| AJ Residential and Commercial Properties Ltd | Real estate | 2026 |
| AJ Site Engineering Limited | Professional & scientific | 2009 |
| AJ Sutton Limited | Health & social care | 2014 |
| AJ Tiling Contracts Limited | Construction | 2019 |
| AJ Trading (NW) Limited | Wholesale & retail | 2015 |
| AJ Trading Services Limited | Transport & logistics | 2025 |
| AJ Williams Property Ltd | Professional & scientific | 2021 |
| Aj's Playdays Ltd | Education | 2016 |
| AJA Brnj Store Ltd | Wholesale & retail | 2025 |
| Ajab Gajab Cafe Limited | Hospitality | 2021 |
| AJB Management Support Ltd | Professional & scientific | 2023 |
| AJB Property Holdings Ltd | Real estate | 2021 |
| AJB Services NW Ltd | Other services | 2019 |
| Ajbreathe Ltd | Health & social care | 2024 |
| AJC Couriers Ltd | Transport & logistics | 2025 |
| AJC ENG Limited | Professional & scientific | 2026 |
| AJC Insulation Services Ltd | Construction | 2024 |
| Ajcam Couriers Ltd | Transport & logistics | 2025 |
| Ajcreative Studios Limited | Information & communication | 2020 |
| AJD Developments Limited | Manufacturing | 2025 |
| AJD General Builders Ltd | Construction | 2024 |
| AJD Landscaping & Building Ltd | Construction | 2025 |