| Atlantic Development Projects Limited | Financial services | 2019 |
| Atlas Orion Ltd | Construction | 2026 |
| Atomar Holdings Limited | Real estate | 2018 |
| Atomium Electronics Limited | Other services | 1977 |
| ATS Plumbing & Heating Ltd | Construction | 2003 |
| Attend EDC Limited | Education | 2014 |
| Aura & Co (EU) Ltd | Other services | 2019 |
| Aurora Events Limited | Professional & scientific | 2012 |
| Aust Ltd | Financial services | 2026 |
| Aust Performance Group Ltd | Professional & scientific | 2026 |
| Austin BEN Ltd. | Health & social care | 2013 |
| Australian Scenic Tours (U.K.) PTY Ltd | | 2004 |
| Auto Accept Finance Limited | Financial services | 2007 |
| Automotive Collective Limited | Wholesale & retail | 2023 |
| Automotive Quality Consultants Ltd | Professional & scientific | 2019 |
| Automotive Vagabond UK Ltd | Wholesale & retail | 2006 |
| Autovogue Composites Limited | Manufacturing | 2018 |
| AV 2013 Limited | Other services | 2013 |
| AV Property Lettings Ltd | Real estate | 2021 |
| AV Timing Ltd | Information & communication | 2023 |
| Avalon Services Limited | Professional & scientific | 2021 |
| Avant Garden Designs Ltd | Professional & scientific | 2021 |
| Avencia Healthcare Ltd | Real estate | 2026 |
| Avenew Management Ltd | Hospitality | 2019 |
| Avenue West Developments Limited | Real estate | 2020 |
| Avoca Inns Limited | Hospitality | 2018 |
| Avula I.T Limited | Information & communication | 2026 |
| Aw&A Ltd | Manufacturing | 2025 |
| Awol Studios (NW) CIC | Other services | 2017 |
| AXY Transport Limited | Transport & logistics | 2024 |
| Ayesha Tariq M Ltd | Health & social care | 2026 |
| AYN Tech PVT Ltd | Information & communication | 2024 |
| Aynsley China Limited | Manufacturing | 1933 |
| Ayoob Enterprises Ltd | Financial services | 2025 |
| B & D Roofcare Limited | Construction | 2026 |
| B & J Engineering (Stoke-On-Trent) Limited | Manufacturing | 2019 |
| B & P Flooring Limited | Construction | 2000 |
| B B Blurton Limited | Wholesale & retail | 2012 |
| B B Trentham Limited | Wholesale & retail | 2015 |
| B Bostan Building Contractors Limited | Construction | 2012 |
| B Demba Ltd | Public administration | 2025 |
| B Gale Joinery Limited | Construction | 2008 |
| B W Motors Limited | Wholesale & retail | 2024 |
| B-Ral Supplies Ltd | Manufacturing | 2026 |
| B. Small Contracts Ltd | Construction | 2007 |
| B.F.M. (Staffs) Limited | Construction | 2009 |
| B2B Contracting Services Ltd. | Water & waste | 2016 |
| Baba Baboon Ltd | Professional & scientific | 2017 |
| Baba Raiya Ltd | Hospitality | 2024 |
| Babetta Marianne Limited | Manufacturing | 2021 |
| Babs Properties Ltd | Real estate | 2022 |
| Bagdas Fireaway Ltd | Hospitality | 2021 |
| Bagdas Minimarket Limited | Wholesale & retail | 2012 |
| Bahoo Halal Supermarket Limited | Wholesale & retail | 2025 |
| Bailey Jack Limited | Wholesale & retail | 2025 |
| Bajrang Bites Private Limited | Hospitality | 2025 |
| Baked by GUY Limited | Manufacturing | 2025 |
| Bali Cafe Ltd | Hospitality | 2025 |
| Ballyginny Electrical Ltd | Construction | 2020 |
| Ballyloughlin Limited | Real estate | 2026 |
| Baloch Group Limited | Wholesale & retail | 2023 |
| Balquess Ltd | Wholesale & retail | 2024 |
| Bamboo Media Productions Limited | Information & communication | 2010 |
| Bankfoot Electricals Ltd | Professional & scientific | 2005 |
| Banking Solutions Limited | Professional & scientific | 1992 |
| BAO & Bento Limited | Hospitality | 2018 |
| Bar 93 Limited | Hospitality | 2023 |
| BAR93NUL Limited | Hospitality | 2026 |
| Bargain World (Newcastle) Limited | Wholesale & retail | 2024 |
| Bargains Central Ltd | Wholesale & retail | 2026 |
| Barker & Dixon Limited | Professional & scientific | 2017 |
| Barlaston Horse Supplies Limited | Other services | 2025 |
| Barley MOW PUB and Kitchen Ltd | Hospitality | 2024 |
| Barrett Industrial Cooling Limited | Administrative & support | 2014 |
| Barrington Jarvis Limited | Financial services | 1992 |
| Barrs Angling Ltd | Wholesale & retail | 2018 |
| Barry Alcock Limited | Wholesale & retail | 2006 |
| Barry's Floorcoverings (Stoke-On-Trent) Limited | Wholesale & retail | 1975 |
| Bars Northwest Ltd | Hospitality | 2024 |
| BAS Logistics UK Ltd | Transport & logistics | 2025 |
| Basehq Limited | Arts & recreation | 2002 |
| Basf UK Finance LLC | | 2016 |
| Basford Villa Driveway Limited | Households | 1997 |
| Basfordian Limited | Real estate | 2025 |
| Bask TAN Ltd | Other services | 2023 |
| Baskeyfield Corporate Holdings Limited | Financial services | 2025 |
| Basl Limited | Professional & scientific | 2012 |
| Batchi Properties Limited | Real estate | 2020 |
| Baxter Bacote-Capiga Nonfiction Limited | Information & communication | 2025 |
| Baxter Bacote-Capiga Scripted Limited | Information & communication | 2025 |
| Baydan Electronic Ltd | Construction | 2020 |
| Bayview Synergy Space Ltd | Other services | 2014 |
| Bazi Ltd | Transport & logistics | 2019 |
| Bbvc Limited | Wholesale & retail | 1982 |
| BC Chiro Limited | Health & social care | 2026 |
| BCB N.E. Limited | Administrative & support | 2018 |
| Bdmk Limited | Hospitality | 2025 |
| BE Fit Limited | Arts & recreation | 2004 |
| Bear Vending Ltd | Wholesale & retail | 2025 |
| Bearcroft Mere Management Company Limited | Households | 2017 |