| A1 Soho Ltd | Wholesale & retail | 2024 |
| A1 Solutions Glasgow Ltd | Transport & logistics | 2025 |
| A1 Solutions International Ltd | Professional & scientific | 2025 |
| A1 Spaces Ltd | Manufacturing | 2011 |
| A1 Sparks Limited | Other services | 2023 |
| A1 Sports Doctor Ltd | Health & social care | 2018 |
| A1 Spot Clean & Janitorial Supplies Limited | Other services | 2017 |
| A1 Staffing Resources Ltd | Transport & logistics | 2025 |
| A1 Suppliers Limited | Wholesale & retail | 2025 |
| A1 Tax Consulting Ltd | Extraterritorial | 2020 |
| A1 Tools and Fixings (Holdings) Limited | Professional & scientific | 2004 |
| A1 Tools and Fixings Limited | Wholesale & retail | 1999 |
| A1 Total Cleaning Ltd | Administrative & support | 2024 |
| A1 Total Properties Limited | Financial services | 2016 |
| A1 Town & Country London Ltd | Construction | 2022 |
| A1 TPS Limited | Real estate | 1988 |
| A1 Trade ING Habermehl Ltd | Professional & scientific | 2012 |
| A1 Trade Ltd | Wholesale & retail | 2026 |
| A1 Trade Solutions Ltd | Wholesale & retail | 2023 |
| A1 Transport Recruitment Limited | Administrative & support | 2020 |
| A1 Transport Solutions Limited | Administrative & support | 2023 |
| A1 Travel Deals Limited | Administrative & support | 2009 |
| A1 Tuitions Ltd | Education | 2020 |
| A1 TV / AAJ News Ltd | Information & communication | 2018 |
| A1 Tyre Centre Limited | Wholesale & retail | 2022 |
| A1 Universal Limited | Wholesale & retail | 2023 |
| A1 Visa Services Limited | Other services | 2011 |
| A1 Watches & Gold London Ltd | Wholesale & retail | 2018 |
| A1 Welding Solutions Ltd | Professional & scientific | 2018 |
| A1 Woodgreen Retail Limited | Wholesale & retail | 2014 |
| A1 Workwear and Supplies Ltd | Other services | 2025 |
| A1 X J1 Limited | Information & communication | 2021 |
| A1&PM Ltd | Construction | 2024 |
| A1&PM Mind Capital Limited | Professional & scientific | 2026 |
| A1.B Storage Ltd | Other services | 2020 |
| A1.DOOR Tech Limited | Manufacturing | 2020 |
| A1.JE Limited | Administrative & support | 2024 |
| A10 BOB Ltd | Professional & scientific | 2025 |
| A10 Boiler Spares Limited | Wholesale & retail | 2008 |
| A10 Builders Limited | Construction | 2025 |
| A10 Cafe Ltd | Hospitality | 2025 |
| A10 Capital Ltd | Information & communication | 2022 |
| A10 Chicken Ltd | Hospitality | 2025 |
| A10 Consulting Ltd | Information & communication | 2023 |
| A10 Food & Wine Ltd | Wholesale & retail | 2014 |
| A10 Invest Ltd | Financial services | 2024 |
| A10 Ltd | Wholesale & retail | 2025 |
| A10 Networks Limited | Professional & scientific | 2010 |
| A10 Refurbs & FIX Ltd | Wholesale & retail | 2018 |
| A100 Plus, Asoc Prom Ingles Comercial, Mepossem, Furia Espanola Abogados Ltd | Extraterritorial | 2019 |
| A1000 Consulting Limited | Information & communication | 2021 |
| A10COMMERCIALSERVICES Ltd | Manufacturing | 2026 |
| A10HAMOUCHENE Ltd | Administrative & support | 2026 |
| A11.2 Design Limited | Professional & scientific | 2025 |
| A115 Limited | Information & communication | 2011 |
| A11Y Ltd. | Extraterritorial | 2012 |
| A11Y Media Ltd | Information & communication | 2024 |
| A12 Building Ltd | Construction | 2021 |
| A12 Motors Ltd | Wholesale & retail | 2026 |
| A12 Scaffolding Sevices Ltd | Construction | 2026 |
| A12 Spice HUT Ltd | Hospitality | 2024 |
| A120 Mobile Tyres Ltd | Wholesale & retail | 2026 |
| A13 Autolab Ltd | Wholesale & retail | 2023 |
| A13 Capital LLP | | 2025 |
| A13 Films Ltd | Administrative & support | 2025 |
| A13 Service Centre Ltd | Wholesale & retail | 2025 |
| A13 Taxis Limited | Wholesale & retail | 2011 |
| A13R Limited | Professional & scientific | 2025 |
| A14R Limited | Information & communication | 2021 |
| A15 Analytics Ltd | Information & communication | 2023 |
| A16891 Nuad Thai Ltd | Other services | 2021 |
| A17WRD Ltd | Real estate | 2020 |
| A18 Group Limited | Professional & scientific | 2018 |
| A1802 Ltd | Professional & scientific | 2023 |
| A18HAMOUCHENE Ltd | Real estate | 2026 |
| A19 Digital PTE. Ltd | Real estate | 2025 |
| A1AB Limited | Real estate | 2025 |
| A1AM Ltd | Real estate | 2018 |
| A1BODYFITNESS Ltd | Arts & recreation | 2026 |
| A1CHOICE Ltd | Wholesale & retail | 2023 |
| A1CO Ltd | Manufacturing | 2020 |
| A1EB Limited | Information & communication | 2002 |
| A1GXP Ltd | Professional & scientific | 2022 |
| A1H Security Ltd | Other services | 2025 |
| A1HATZLOCHA Limited | Real estate | 2018 |
| A1ILLUSTRATION Ltd | Information & communication | 2022 |
| A1JAMAICAN Food Ltd | Hospitality | 2024 |
| A1JOBS Limited | Administrative & support | 2004 |
| A1K Express Limited | Wholesale & retail | 2022 |
| A1K Holding Ltd | Financial services | 2022 |
| A1KNIGHT Labs Ltd | Wholesale & retail | 2026 |
| A1M Express Limited | Real estate | 2024 |
| A1M Property Ltd | Real estate | 2025 |
| A1M1 Link Management Limited | Other services | 1994 |
| A1MARKET Ltd | Wholesale & retail | 2025 |
| A1MRECORDS Ltd | Information & communication | 2012 |
| A1P Ltd | Information & communication | 2013 |
| A1PD Ltd | Real estate | 2020 |
| A1R. TR Group Ltd | Wholesale & retail | 2018 |
| A1R3 Ltd | Information & communication | 2019 |