| Adhoc Engineering Limited | Professional & scientific | 2011 |
| Adicol Builders Ltd | Construction | 2026 |
| Adityaraj DEV Limited | Professional & scientific | 2021 |
| Adjunct Ltd | Real estate | 2024 |
| ADL Associates (Warwick) Limited | Professional & scientific | 2011 |
| Admin Outsource Ltd | Administrative & support | 2024 |
| Admiral Translations Limited | Other services | 1996 |
| Admire Investments Limited | Real estate | 2022 |
| Adqc Limited | Professional & scientific | 2023 |
| Adru Design Limited | Information & communication | 2014 |
| Advanced EPI Materials and Devices Ltd | Professional & scientific | 2015 |
| Advanced Therapeutic Products Ltd | Financial services | 2025 |
| Advena Malta (Holdings) Limited | Financial services | 2021 |
| Advena Medical Limited | Health & social care | 2013 |
| Advena UK (Holdings) Limited | Financial services | 2021 |
| Advertising Associates Ltd | Professional & scientific | 2022 |
| Adviserpay Limited | Administrative & support | 2024 |
| Advocate Advisory Ltd | Information & communication | 2026 |
| ADW Property Ltd | Real estate | 2021 |
| ADW Roofing & Maintenance Services Limited | Construction | 2024 |
| AEF Group Limited | Financial services | 2023 |
| Aerographix Ltd | Professional & scientific | 2023 |
| Aerostyle (UK) Limited | Administrative & support | 2004 |
| Aesthetic & Implant Seminars Ltd | Education | 2012 |
| Aesthetic Mechanics Limited | Professional & scientific | 2019 |
| Aesthetics by Nichola Limited | Other services | 2023 |
| Aesthetics X Limited | Other services | 2025 |
| Aetj Limited | Real estate | 2025 |
| Af&F Construction Ltd | Construction | 2022 |
| Afectivo Ltd | Professional & scientific | 2025 |
| Affordable Group Limited | Hospitality | 2025 |
| Afrere Consultancy Ltd | Wholesale & retail | 2022 |
| After Dark Games Ltd | Information & communication | 2022 |
| AG Inc Ltd. | Financial services | 2020 |
| AG Instruments Limited | Manufacturing | 2009 |
| AG Legal Consulting Limited | Administrative & support | 2022 |
| Agalinks Cookware Limited | Extraterritorial | 1967 |
| AGE UK Coventry & Warwickshire (Trading) Limited | Hospitality | 1996 |
| AGE UK Coventry and Warwickshire | Other services | 2001 |
| Agency Triple SIX Ltd | Information & communication | 2021 |
| Agilion Limited | Administrative & support | 2025 |
| AGL (Holdings) Limited | Financial services | 2010 |
| Agra Wealth Ltd | Hospitality | 2020 |
| Agreeable Ltd | Financial services | 2021 |
| AGS Admin & Training Limited | Administrative & support | 2025 |
| Aguire Consulting Limited | Professional & scientific | 2012 |
| Agusti&Chela Ltd. | Professional & scientific | 2016 |
| AGY Consultancy Limited | Information & communication | 2016 |
| AH Music Ltd | Arts & recreation | 2020 |
| AH the Willows Developments Limited | Construction | 2022 |
| AHF Holdings Ltd | Financial services | 2026 |
| AI Training Courses Ltd | Information & communication | 2024 |
| AIM Accounting Ltd | Professional & scientific | 2023 |
| AIM Carbon Consultants Ltd | Professional & scientific | 2026 |
| Airmech Systems Limited | Manufacturing | 2022 |
| Airport Express Warwickshire Limited | Transport & logistics | 2019 |
| Airvent Design and Installation Limited | Professional & scientific | 2014 |
| Aj&H Rentals Ltd | Real estate | 2026 |
| Ajas Properties Ltd | Real estate | 2024 |
| AJC Independent Consulting Ltd | Professional & scientific | 2024 |
| AJD OLE Engineering Limited | Professional & scientific | 2021 |
| AJM Technical Management Ltd | Professional & scientific | 2025 |
| AJR 85 Limited | Hospitality | 2023 |
| AJS Flood Risk Consulting Ltd | Professional & scientific | 2021 |
| AK Electrical Management Limited | Construction | 2022 |
| AK Wealth Management Limited | Financial services | 2011 |
| Akira Holdings Limited | Financial services | 2023 |
| Akro Pro Ltd | Construction | 2025 |
| AKS Makeup Artist Ltd | Other services | 2023 |
| Alan Brookes Consultants Limited | Professional & scientific | 2006 |
| Alan Browne Lapping Services Limited | Professional & scientific | 2019 |
| Alan Clews Groundworks Limited | Construction | 2020 |
| Alan Reullier Art Ltd | Wholesale & retail | 2026 |
| Albany Group International Limited | Administrative & support | 2006 |
| Albany Risk Limited | Information & communication | 2015 |
| Albany Road Earlsdon Ltd | Construction | 2020 |
| Albany Technologies Limited | Information & communication | 2022 |
| Albany Terrace Management (1989) Limited | Households | 1989 |
| Albatros Cromac Smith Limited | Extraterritorial | 2013 |
| Alcanavenue Limited | Health & social care | 2025 |
| Alchemy Consultants Receivables Limited | Education | 2016 |
| Alchemy Studios Ltd | Information & communication | 2023 |
| Alen Barbers Ltd | Other services | 2020 |
| Alethea Law Limited | Professional & scientific | 2025 |
| Alex Viola Apps Limited | Information & communication | 2024 |
| Alex Wright Roofing Ltd | Construction | 2023 |
| Alexander Blackpool Ltd | Households | 2024 |
| Alexander James Hairdressing Limited | Other services | 2013 |
| Alfea Ltd | Professional & scientific | 2019 |
| Alfie Raide Industries Ltd | Professional & scientific | 2026 |
| Alfie's Bites Ltd | Hospitality | 2023 |
| Alfix Stairlifts Ltd | Wholesale & retail | 2021 |
| ALI Bell Design Limited | Professional & scientific | 2015 |
| Align Financial Planning Ltd | Financial services | 2025 |
| Aligned Events Ltd | Administrative & support | 2018 |
| Alison Saunders Ltd | Professional & scientific | 2014 |
| Alive Property Ltd | Real estate | 2023 |
| Alka Limited | Real estate | 2022 |
| ALL Equine Transport Limited | Other services | 2023 |
| ALL Sensors Limited | Extraterritorial | 2019 |