| Anyweb Consultancy Ltd | Information & communication | 2024 |
| Anywhere Travel Limited | Administrative & support | 2025 |
| AO Coaching Ltd. | Professional & scientific | 2015 |
| AO Health 2 Ltd | Wholesale & retail | 2025 |
| Aoam Ltd | Hospitality | 2022 |
| AOF Transport Ltd | Transport & logistics | 2025 |
| Aofad Properties Ltd | Households | 2021 |
| AOG Aviation Ltd | Manufacturing | 2021 |
| AOH PVT Ltd | Wholesale & retail | 2023 |
| AOJ Cleaning Limited | Administrative & support | 2024 |
| AON Property Maintenance Ltd | Construction | 2025 |
| Aone Beauty Salon Ltd | Other services | 2024 |
| AOO Rental Limited | Real estate | 2021 |
| AOP Trading Ltd | Wholesale & retail | 2022 |
| Aorp Ltd | Real estate | 2016 |
| AOS Refurb & Developments Ltd | Construction | 2026 |
| Aounex Collectible Store Ltd | Wholesale & retail | 2024 |
| AOV Consultancy Ltd | Professional & scientific | 2022 |
| AOV Limited | Wholesale & retail | 2023 |
| AP Analytics Limited | Information & communication | 2021 |
| AP Car Solutions Ltd | Administrative & support | 2018 |
| AP Care Ltd | Health & social care | 2025 |
| AP Creative Studios Ltd | Professional & scientific | 2021 |
| AP Groundworks Ltd | Construction | 2023 |
| AP Health Ltd | Wholesale & retail | 2011 |
| AP Leeds Limited | Real estate | 2022 |
| AP Management (Yorkshire) Ltd | Professional & scientific | 2025 |
| AP Motors and Sales Ltd | Wholesale & retail | 2020 |
| AP Motors Leeds Ltd | Wholesale & retail | 2025 |
| AP Motors South Leeds Ltd | Wholesale & retail | 2025 |
| AP Property Solutions (Yorkshire) Ltd | Real estate | 2026 |
| AP SD Five Limited | Wholesale & retail | 2025 |
| AP Vehicle Care Limited | Wholesale & retail | 2025 |
| AP17 Management Ltd | Information & communication | 2016 |
| Apache Auto Limited | Extraterritorial | 2023 |
| Apadana Persian Restaurant Limited | Hospitality | 2017 |
| Apaseal Limited | Wholesale & retail | 1981 |
| Apater Alpha LP | | 2019 |
| Apater Capital Limited | Financial services | 2019 |
| APB Storage Limited | Hospitality | 2015 |
| Apbreaks Ltd | Manufacturing | 2026 |
| APD System Limited | Information & communication | 2026 |
| Apdn Healthcare Ltd | Health & social care | 2022 |
| Apekali Consultancy Services Ltd | Real estate | 2015 |
| Apeng Limited | Professional & scientific | 2022 |
| Aper Brothers Ltd | Construction | 2024 |
| Apergy Holdings Limited | Financial services | 2022 |
| Apergy Solutions Limited | Other services | 2014 |
| Aperto Intellect Limited | Professional & scientific | 2013 |
| Apew Company Limited | Wholesale & retail | 2025 |
| Apex Acquisitions Ltd | Real estate | 2025 |
| Apex Automotive Leeds Ltd | Wholesale & retail | 2026 |
| Apex Business Group Limited | Financial services | 2018 |
| Apex Coating Systems Ltd | Professional & scientific | 2024 |
| Apex Commercial Finance UK Ltd | Financial services | 2020 |
| Apex Commercial Partners Ltd | Professional & scientific | 2026 |
| Apex Corp Ltd | Wholesale & retail | 2018 |
| Apex Cyber Consulting Ltd | Information & communication | 2023 |
| Apex Delivery Solutions Ltd | Transport & logistics | 2025 |
| Apex III Survey Ltd | Construction | 2016 |
| Apex Leeds Ltd | Construction | 2018 |
| Apex Money Transfer Ltd | Financial services | 2025 |
| Apex Mortgage & Protection UK Ltd | Financial services | 2017 |
| Apex Pharmacare Ltd | Other services | 2025 |
| Apex Plastering Ltd | Construction | 2025 |
| Apex Portfolio (Ripon) Limited | Real estate | 2019 |
| Apex Prime Properties Ltd | Real estate | 2024 |
| Apex Project Solutions Ltd | Professional & scientific | 2025 |
| Apex Properties and Investments Limited | Real estate | 2009 |
| Apex Real Estate Group Ltd | Hospitality | 2021 |
| Apex Rehab and Performance Limited | Health & social care | 2024 |
| Apex Resourcing Solutions Ltd | Administrative & support | 2020 |
| Apex Restoration Limited | Construction | 2025 |
| Apex Risk Management Group Ltd | Administrative & support | 2026 |
| Apex Search and Selection Ltd | Administrative & support | 2018 |
| Apex Solutions (Yorkshire) Ltd | Construction | 2020 |
| Apex Storage Limited | Real estate | 2026 |
| Apex Supplements Ltd | Wholesale & retail | 2020 |
| Apex Veeva Consulting Ltd | Information & communication | 2020 |
| Apex Window Cleaning & Maintenance Ltd | Administrative & support | 2020 |
| Apexbyte Technologies Limited | Information & communication | 2024 |
| Apexshield Ltd | Administrative & support | 2025 |
| Apfels & Co Limited | Professional & scientific | 2012 |
| APH Maintenance Limited | Construction | 2014 |
| APH Visuals Limited | Information & communication | 2024 |
| Aphrodites (UK) Limited | Other services | 2006 |
| API Social Network Ltd | Professional & scientific | 2024 |
| Apichisi Limited | Health & social care | 2017 |
| Apknights Digital Ltd | Information & communication | 2023 |
| APL Electrical Limited | Construction | 2003 |
| Aplh Limited | Professional & scientific | 2008 |
| Aplx Ltd | Information & communication | 2005 |
| APN Holdings Ltd | Financial services | 2017 |
| APN Hotel Group Limited | Hospitality | 2017 |
| Apna Chai Ltd | Hospitality | 2025 |
| Apoc Systems Limited | Information & communication | 2002 |
| Apogee Associates Limited | Administrative & support | 2020 |
| Apola Ltd | Administrative & support | 2013 |
| Apollo 1 Investments | Financial services | 2013 |
| Apollo 11 Investments | Financial services | 2013 |