| Amanda James Homes Limited | Construction | 2020 |
| Amber Salon Limited | Wholesale & retail | 2025 |
| Amina Enterprises Ltd | Wholesale & retail | 2022 |
| AMO LA Ruta Limited | Wholesale & retail | 2023 |
| Amphora Kitchen Ltd | Wholesale & retail | 2023 |
| Amstag Ltd | Professional & scientific | 2020 |
| AN Plant Hire Ltd | Administrative & support | 2025 |
| Ander IT Systems Limited | Information & communication | 2021 |
| Anderson-Wales Limited | Professional & scientific | 1999 |
| Andrea Haigh Consulting Ltd | Professional & scientific | 2025 |
| Andrew Maidens Bathroom and Tiling Solutions Ltd | Construction | 2014 |
| Antico Deli Limited | Hospitality | 2025 |
| Antihero Ventures Ltd | Financial services | 2025 |
| Antioch Christian Bookroom Ltd | Administrative & support | 2006 |
| Antony and Patricia 24 Limited | Other services | 2024 |
| Anycompcompany Ltd | Information & communication | 2026 |
| AO Properties (NW) Ltd | Real estate | 2026 |
| APB Plastics Limited | Manufacturing | 1998 |
| Apex Surveying Services Limited | Financial services | 2012 |
| Apollo Plant Ltd | Construction | 2025 |
| Appliance Testing Services Limited | Manufacturing | 2025 |
| Aquaclean Holdings Limited | Professional & scientific | 2022 |
| Aramo Group Ltd | Information & communication | 2026 |
| ARB Property Management Ltd | Real estate | 2021 |
| Arcade Club Holdings Limited | Financial services | 2019 |
| Architecture AS a Service Limited | Information & communication | 2021 |
| Archstone Data Services Ltd | Professional & scientific | 2024 |
| Archtech Design Solutions Ltd | Professional & scientific | 2025 |
| Aria Anaesthetics Services Limited | Health & social care | 2022 |
| Ariel Developments Limited | Professional & scientific | 1983 |
| Art of Diving UK Ltd | Administrative & support | 2021 |
| Artemis Projects Limited | Professional & scientific | 2011 |
| Artic Developments Ltd | Real estate | 2015 |
| Asbestaway Limited | Professional & scientific | 2015 |
| Asbestology Ltd | Extraterritorial | 2016 |
| ASH Roofing (NW) Ltd | Construction | 2022 |
| Ashcroft Property Rentals Limited | Real estate | 2018 |
| Ashpool Ltd | Real estate | 2020 |
| ASK Bespoke Joinery Limited | Construction | 2026 |
| Aspin Designs Limited | Professional & scientific | 2011 |
| Aspire Pictures Ltd | Other services | 2020 |
| Aspire Sales Consultancy Limited | Professional & scientific | 2025 |
| Aspire Tuition Ltd | Education | 2025 |
| Astro Pitches Ltd | Arts & recreation | 2020 |
| AT Efficiency Ltd | Professional & scientific | 2020 |
| Atic Group Limited | Construction | 2015 |
| ATS Tanning Ltd | Professional & scientific | 2023 |
| Attet Ltd | Real estate | 2025 |
| Atthebar Ltd | Hospitality | 2025 |
| Attock Communications Limited | Information & communication | 2004 |
| Attock Network Products Limited | Information & communication | 2000 |
| Auckshire Homes Limited | Construction | 2019 |
| Audio Visual Hire UK Ltd | Information & communication | 2025 |
| Audio Visual Intelligence Limited | Wholesale & retail | 2010 |
| Augan Delivery Limited | Transport & logistics | 2019 |
| Automatique AI Limited | Information & communication | 2025 |
| AVA MAE Media Ltd | Extraterritorial | 2024 |
| AWG Ventures Limited | Professional & scientific | 2023 |
| Ayza Consult Ltd | Professional & scientific | 2025 |
| AZ IT Limited | Information & communication | 2024 |
| AZK Enterprise Limited | Wholesale & retail | 2025 |
| Aztek Security Services Ltd | Administrative & support | 2024 |
| B & B Developments Rossendale Limited | Construction | 2022 |
| B & B Holdings Rossendale Ltd | Real estate | 2026 |
| B & H Properties (Rossendale) Limited | Real estate | 2020 |
| B a Installs Ltd | Construction | 2022 |
| B Bowden Ltd | Real estate | 2025 |
| B Clean (Rossendale) Limited | Administrative & support | 2012 |
| B Digital Partners Ltd | Professional & scientific | 2020 |
| B P Tweedale Joinery Limited | Construction | 2012 |
| B U Properties Limited | Real estate | 2011 |
| B&E Boys (Construction) Limited | Construction | 2004 |
| B. & E. Boys (Developments) Limited | Extraterritorial | 1984 |
| B. & E. Boys (Properties) Limited | Extraterritorial | 1986 |
| B. & E. Boys Limited | Construction | 1996 |
| B21 Ltd | Construction | 2024 |
| Backlight Visuals Limited | Information & communication | 2016 |
| Bacup View Limited | Hospitality | 2025 |
| Bainbridge Alexander Ltd | Real estate | 2025 |
| Baject Ltd | Professional & scientific | 2025 |
| Balance FIX Limited | Financial services | 2025 |
| Balbis Consulting Limited | Construction | 2017 |
| Balbis Investments Ltd | Construction | 2022 |
| Balmansports Ltd | Arts & recreation | 2021 |
| Bamson Hospitality Ltd | Hospitality | 2025 |
| Banafshah PVT Limited | Health & social care | 2015 |
| Bangladeshi Curry Food Ltd | Hospitality | 2024 |
| Bargain Box Home Fragrance Ltd | Wholesale & retail | 2025 |
| BARGAINS247 Limited | Wholesale & retail | 2024 |
| Basics Clothing Ltd | Wholesale & retail | 2026 |
| Bassaire Cleanrooms Ltd | Manufacturing | 2005 |
| Battlecrate Ltd. | Information & communication | 2015 |
| BB Autocare Limited | Wholesale & retail | 2018 |
| BB4 8TQ Management Limited | Households | 2021 |
| BB4 Foods Ltd | Wholesale & retail | 2024 |
| BCK Holdings Ltd | Financial services | 2026 |
| BCM Hire Ltd | Arts & recreation | 2021 |
| BE Happy Books Ltd | Information & communication | 2020 |
| BE YOU Lifestyle Boutique Limited | Wholesale & retail | 2022 |
| Beacon Dementia and Wellbeing | Health & social care | 2017 |