| A-Team Building Construction Ltd | Construction | 2014 |
| A-Team Cleaning Services Limited | Administrative & support | 2020 |
| A-Team Demolition & Waste Services Ltd | Water & waste | 2018 |
| A-Team Drylining Ltd | Construction | 2025 |
| A-Team Group Limited | Real estate | 2025 |
| A-Team Marine Ltd | Professional & scientific | 2026 |
| A-Team Property Group Ltd | Construction | 2025 |
| A-Team Property Services Ltd | Real estate | 2024 |
| A-Tech Engineering Hncc Ltd | Construction | 2025 |
| A-Tech Recruitment Ltd | Administrative & support | 2020 |
| A-Tech Ventures Ltd | Wholesale & retail | 2026 |
| A-Technologies Holdings Limited | Financial services | 2019 |
| A-Tek Solutions Limited | Information & communication | 1999 |
| A-Telecom Limited | Information & communication | 2019 |
| A-To-E Training and Solutions Ltd | Education | 2006 |
| A-Top Trading Limited | Wholesale & retail | 2025 |
| A-Touch Ltd | Information & communication | 2007 |
| A-Type Sourcing Ltd | Wholesale & retail | 2023 |
| A-United Recruitment Limited | Administrative & support | 2022 |
| A-V-A Blinds & Shutters London Ltd | Professional & scientific | 2025 |
| A-Viaggi Limited | Administrative & support | 1985 |
| A-Vision Management Limited | Households | 2019 |
| A-Wave.Com Ltd | Arts & recreation | 1999 |
| A-Xpress Ltd | Transport & logistics | 2019 |
| A-Z Communications and Consultants Ltd | Information & communication | 2013 |
| A-Z Accountancy & Taxation Services Ltd | Professional & scientific | 2020 |
| A-Z Agencies & Accountants Ltd | Professional & scientific | 1995 |
| A-Z Agency Ltd | Wholesale & retail | 2021 |
| A-Z ALL Directionz Ltd | Wholesale & retail | 2026 |
| A-Z ALL Trade UK Limited | Wholesale & retail | 2023 |
| A-Z Anaesthesiacare Ltd | Health & social care | 2013 |
| A-Z Analysis Ltd | Information & communication | 2026 |
| A-Z Apex Ltd | Wholesale & retail | 2024 |
| A-Z Auto Repair Ltd | Administrative & support | 2023 |
| A-Z Brand Management Limited | Administrative & support | 2024 |
| A-Z Building and Maintenance Services Ltd | Construction | 2021 |
| A-Z Building Contractors Limited | Construction | 2005 |
| A-Z Building Work Ltd | Professional & scientific | 2025 |
| A-Z Business Consultancy Ltd | Professional & scientific | 2019 |
| A-Z Business Training Ltd | Education | 2002 |
| A-Z Car Wash & Services Limited | Wholesale & retail | 2017 |
| A-Z Carpentry Limited | Construction | 2013 |
| A-Z Comprehensive Solutions Ltd | Information & communication | 2023 |
| A-Z Concept Building Ltd | Construction | 2020 |
| A-Z Core Services Ltd | Real estate | 2020 |
| A-Z Driving Services Ltd | Education | 2026 |
| A-Z Dynamics Group Ltd | Information & communication | 2023 |
| A-Z Electrical & Heating Limited | Construction | 2012 |
| A-Z Energy Solutions Limited | Energy | 2022 |
| A-Z Events LLP | | 2012 |
| A-Z Events Management Limited | Administrative & support | 2013 |
| A-Z Films Limited | Information & communication | 2006 |
| A-Z Fusion Ltd | Information & communication | 2024 |
| A-Z General Maintenance Limited | Construction | 2021 |
| A-Z Group of Ltd | Wholesale & retail | 2025 |
| A-Z Heating Engineers Ltd | Construction | 2023 |
| A-Z Horizon Innovations Ltd | Information & communication | 2024 |
| A-Z Joinery Services Limited | Construction | 2018 |
| A-Z Joinery Solutions Ltd | Construction | 2025 |
| A-Z Law Solicitors Limited | Professional & scientific | 2005 |
| A-Z Learning Academy Ltd | Education | 2023 |
| A-Z Legal Solutions Ltd | Professional & scientific | 2024 |
| A-Z Luggage Security System Ltd | Transport & logistics | 2020 |
| A-Z Makeup Ltd | Wholesale & retail | 2024 |
| A-Z Mall Ltd | Wholesale & retail | 2023 |
| A-Z Market Limited | Wholesale & retail | 2019 |
| A-Z Mechanic London Ltd | Wholesale & retail | 2026 |
| A-Z Medical Writing Limited | Professional & scientific | 2008 |
| A-Z News and OFF Licence Ltd | Wholesale & retail | 2019 |
| A-Z Nexus Ltd | Information & communication | 2023 |
| A-Z Odyssey Ltd | Construction | 2023 |
| A-Z Orthodontics Limited | Health & social care | 2016 |
| A-Z Packaging Ltd | Wholesale & retail | 2020 |
| A-Z Plumbing Ltd | Construction | 2024 |
| A-Z Portfolio Ltd | Real estate | 2024 |
| A-Z PPC Limited | Professional & scientific | 2012 |
| A-Z Precision Engineering Ltd | Construction | 2023 |
| A-Z Precision Services Ltd | Construction | 2023 |
| A-Z Property Care Service Limited | Real estate | 2024 |
| A-Z Property Management Limited | Households | 2023 |
| A-Z Renovations & Construction Ltd | Construction | 2016 |
| A-Z Renovations Limited | Construction | 2017 |
| A-Z Rentals Ltd | Administrative & support | 2024 |
| A-Z Security-Event Limited | Administrative & support | 2014 |
| A-Z Smart Logistics Ltd | Transport & logistics | 2024 |
| A-Z Snekker Limited | Extraterritorial | 2022 |
| A-Z Solution London Ltd | Information & communication | 2026 |
| A-Z Sourcing (London) Limited | Wholesale & retail | 2022 |
| A-Z Spectrum Ltd | Professional & scientific | 2024 |
| A-Z Sports Coaching Ltd | Arts & recreation | 2016 |
| A-Z Star Cars Limited | Transport & logistics | 2007 |
| A-Z Synergy Ltd | Professional & scientific | 2023 |
| A-Z Tax Accountants Ltd | Professional & scientific | 2021 |
| A-Z Tech Ventures Ltd | Information & communication | 2024 |
| A-Z Trade Europe Ltd | Wholesale & retail | 2012 |
| A-Z Training Centre Limited | Education | 2012 |
| A-Z Transport Services Ltd | Transport & logistics | 2017 |
| A-Z Travel Ltd | Professional & scientific | 2026 |
| A-Z Tyre Ltd | Wholesale & retail | 2020 |
| A-Z UKK Ltd | Wholesale & retail | 2025 |