| Aperify Ltd | Other services | 2023 |
| APJ Enterprises Limited | Construction | 2013 |
| Apk-Security Ltd | Administrative & support | 2022 |
| Appex Care Limited | Health & social care | 2025 |
| Applied Electrotech Limited | Construction | 2008 |
| Aqoodix Ltd | Administrative & support | 2025 |
| Aras Catering Ltd | Hospitality | 2019 |
| ARC Angel Welding and Training Ltd | Professional & scientific | 2024 |
| Arisal Services Ltd | Real estate | 2022 |
| Arman INT Group Ltd | Wholesale & retail | 2024 |
| Armour Consortium Ltd | Information & communication | 2024 |
| ARO Homes Limited | Real estate | 2001 |
| Art 2 by Limited | Wholesale & retail | 2002 |
| Art-Balance-Design Ltd | Administrative & support | 2025 |
| Asgard Renewables Limited | Energy | 2013 |
| Asgard Topco Limited | Financial services | 2025 |
| Ashley Harden Forestry & Agricultural Contracting Ltd | Agriculture & fishing | 2016 |
| Ashmole & Co. Limited | Extraterritorial | 2000 |
| Askd Limited | Professional & scientific | 2015 |
| Askens Limited | Construction | 1997 |
| Asks Limited | Real estate | 2006 |
| Assevarate Ltd | Administrative & support | 2010 |
| Astori Limited | Health & social care | 2025 |
| Astrogen Ltd | Other services | 2019 |
| AT Mortgages Ltd | Financial services | 2020 |
| ATE2 Ltd | Administrative & support | 2024 |
| ATM Installations Limited | Manufacturing | 2017 |
| Audic Ltd | Other services | 2019 |
| Austwel Construction Limited | Hospitality | 1996 |
| Autolink Global Ltd | Wholesale & retail | 2026 |
| Automotive Retail Consultants Ltd | Professional & scientific | 2020 |
| Autopark Isernhagen Ltd | Administrative & support | 2020 |
| Avent Payroll Solutions Limited | Professional & scientific | 2014 |
| Aviation Heritage Foundation Limited | Arts & recreation | 2008 |
| Awarexpansion Ltd | Extraterritorial | 2025 |
| Awesome Fishing Limited | Other services | 2013 |
| Awesome Welds Ltd | Administrative & support | 2014 |
| Awyr LAS Ltd | Transport & logistics | 2020 |
| B G Betterspoons Limited | Hospitality | 2001 |
| B M Patel & SON Limited | Wholesale & retail | 2002 |
| B.A.N.Y.-G Ltd | Extraterritorial | 2024 |
| B.B. Mathias & Co. Limited | Manufacturing | 1976 |
| Badger Ecology Ltd | Professional & scientific | 2012 |
| Ballrink Limited | Other services | 2017 |
| Balop Construction Ltd | Administrative & support | 2019 |
| Bambus International Ltd | Administrative & support | 2022 |
| Banbury Mobile Mechanic Ltd | Wholesale & retail | 2020 |
| Bane Davies Limited | Administrative & support | 2025 |
| Bans Contracting Ltd | Administrative & support | 2023 |
| Barnstead Developments Limited | Construction | 2003 |
| Barnstead Fire Sprinklers Limited | Other services | 2017 |
| Barry Waun Enterprises Limited | Agriculture & fishing | 2006 |
| Barty Events Ltd | Arts & recreation | 2023 |
| Bay View Stores Ltd | Wholesale & retail | 2010 |
| Bayit Ltd | Real estate | 2016 |
| BB4 Limited | Wholesale & retail | 2008 |
| BCB Pembs Ltd | Construction | 2026 |
| BE Free ASK ME Ltd | Administrative & support | 2025 |
| BE Wafe Ltd | Extraterritorial | 2025 |
| BEACON52 Ltd. | Transport & logistics | 2023 |
| Bear Restorations Ltd | Construction | 2024 |
| Become Holistic Ltd | Extraterritorial | 2025 |
| Bedeco Ltd | Other services | 2021 |
| Beech Tree Gardens Limited | Real estate | 2003 |
| Beechwood Farms Limited | Agriculture & fishing | 2003 |
| Befeliz Ltd | Extraterritorial | 2024 |
| Befreit Leben Ltd | Administrative & support | 2022 |
| Beggars Property Limited | Real estate | 2021 |
| Begreen (Wales) Ltd | Wholesale & retail | 2009 |
| Begum ALI Holdings Limited | Real estate | 2025 |
| Belreside Ltd | Extraterritorial | 2025 |
| Belt Designs Limited | Manufacturing | 2017 |
| Belton & SON Limited | Construction | 2002 |
| BEN Llewellin Holdings Ltd | Households | 2023 |
| BEN Walton Films Limited | Professional & scientific | 2013 |
| Benextra Ltd | Other services | 2021 |
| Bennett Construction Services Ltd | Construction | 2020 |
| Berkeley Coachworks Ltd | Manufacturing | 2018 |
| Berweiler Ltd | Extraterritorial | 2023 |
| Bespoke Medical Technology Limited | Health & social care | 2017 |
| BET Insight Limited | Information & communication | 2024 |
| Bethwaite Limited | Extraterritorial | 1999 |
| Bicton Transport Limited | Transport & logistics | 2004 |
| Biffy's Bar Ltd | Hospitality | 2025 |
| Big Branding Limited | Extraterritorial | 2014 |
| Bijoux Bijoux Ltd | Wholesale & retail | 2023 |
| Bingang Trading Ltd | Wholesale & retail | 2021 |
| Bipulse Ltd | Other services | 2023 |
| Birograf Ltd | Other services | 2024 |
| Birtwick Park Ltd | Hospitality | 2020 |
| Bisley H. Munt & Sons Ltd | Wholesale & retail | 2026 |
| Bismillah Food & Catering Ltd | Hospitality | 2025 |
| Bistro Bites Ltd | Hospitality | 2022 |
| Bisync Ltd | Other services | 2023 |
| BL Catering Limited | Hospitality | 2025 |
| Black Dragon Holdings Ltd | Financial services | 2023 |
| Black Dragon Ltd | Information & communication | 2012 |
| Blackbear Cardiff Ltd | Real estate | 2026 |
| Blackbear Sales & Letting Ltd | Real estate | 2024 |
| Blackbear Ventures UK Ltd | Real estate | 2026 |