| Asbbsb Limited | Health & social care | 2021 |
| Ascent Multi Academy Trust | Education | 2025 |
| ASD Fabrication Services Ltd | Construction | 2014 |
| Asda Supermarket Tyres Ltd | Extraterritorial | 2015 |
| Asees (Midlands) Limited | Hospitality | 2021 |
| Asgard Builders Ltd | Construction | 2018 |
| Asgh (UK) Limited | Financial services | 2024 |
| ASH Remediation Management Limited | Water & waste | 2009 |
| Ashbourne Construction Limited | Construction | 2013 |
| Ashjack Ltd | Other services | 2021 |
| Ashton's Installations and Construction Ltd | Construction | 2012 |
| Ashwood Social Club Limited | Arts & recreation | 1998 |
| ASK Diagnostic Support Ltd | Professional & scientific | 2022 |
| ASN Holdings Group Ltd | Financial services | 2025 |
| ASN Mechanics Limited | Wholesale & retail | 2016 |
| ASN Real Estate 1 Ltd | Construction | 2025 |
| ASN Real Estate 2 Ltd | Construction | 2025 |
| ASN Real Estate 3 Ltd | Construction | 2025 |
| ASN Real Estate 4 Ltd | Construction | 2025 |
| Aspire Index Limited | Professional & scientific | 2026 |
| Aspire Trading Group Ltd | Information & communication | 2020 |
| Asset Security Group Ltd | Administrative & support | 2025 |
| Asset Storage Limited | Administrative & support | 2005 |
| Assured Plumbing Ltd | Construction | 2023 |
| Astro GAS Heating and Plumbing Limited | Construction | 2008 |
| Ateee Ltd | Households | 2025 |
| Athena Accountancy Ltd | Professional & scientific | 2014 |
| Auctus Professional Services Ltd | Professional & scientific | 2015 |
| Auctus Tax Consultants Ltd | Professional & scientific | 2015 |
| Auto Services Tipton Limited | Wholesale & retail | 2017 |
| Autoazure Ltd | Information & communication | 2025 |
| Autok Limited | Wholesale & retail | 1960 |
| Automobile Art Ltd | Information & communication | 2004 |
| Automotive Cost Engineering Ltd | Professional & scientific | 2013 |
| Automotive Systems (UK) Limited | Information & communication | 2007 |
| Automotive Technical Solutions Limited | Professional & scientific | 2007 |
| AUTONOMY4U Ltd | Administrative & support | 2013 |
| Auventis Ltd | Wholesale & retail | 2026 |
| Auvergne Ltd | Administrative & support | 2016 |
| Avari Investment Management Ltd | Real estate | 2025 |
| Avey & SON Ltd | Construction | 2013 |
| Avonland Capital Partners Holdings Ltd | Real estate | 2026 |
| Avonland Capital Partners Investments Ltd | Real estate | 2026 |
| Avonland Capital Partners Management Ltd | Real estate | 2026 |
| Aximiz Limited | Manufacturing | 2024 |
| Axiom Management Services Ltd | Administrative & support | 2002 |
| Ayaoge Company Limited | Wholesale & retail | 2023 |
| B & a Installations Ltd | Construction | 2021 |
| B C D Cold Rolled Strip Limited | Manufacturing | 1973 |
| B D Railways Limited | Professional & scientific | 2013 |
| B Green Controls Ltd | Construction | 2026 |
| B Hawkins Plant Hire & Contracting Ltd | Construction | 2012 |
| B&M Old and New Roofs Ltd | Construction | 2025 |
| B. Wheatley & Sons Ltd | Administrative & support | 2002 |
| BAE Hospitality Services Ltd | Hospitality | 2025 |
| Bail Electrical Solutions Ltd. | Construction | 2012 |
| Bailey's Hair & Beauty Ltd | Other services | 2022 |
| Baja Properties Ltd | Real estate | 2022 |
| Baked Apple (West Midlands) Limited | Wholesale & retail | 2019 |
| Baker Brows Limited | Other services | 2019 |
| Baker Enterprises Limited | Professional & scientific | 2018 |
| Banks & Cope Engineering Limited | Construction | 1998 |
| Bark and Bean Coffee Shop Ltd | Hospitality | 2024 |
| Barmy Garms Ltd | Wholesale & retail | 2024 |
| Barney Homes Ltd | Construction | 2016 |
| Barnwell Property Holdings Ltd | Construction | 2025 |
| Barnwell Renovations Ltd | Construction | 2025 |
| Barrett Electrical Security & Fire Ltd | Construction | 2019 |
| Basil Research Initiative Ltd | Professional & scientific | 2024 |
| Baxter & Bloom Ltd | Extraterritorial | 2024 |
| Bay View Properties (Cardiff) Ltd | Real estate | 2025 |
| Baynhall Holdings I Ltd | Other services | 2022 |
| Baynhall Investments Ltd | Professional & scientific | 2020 |
| Bcjc Property Limited | Real estate | 2020 |
| Bdj-Cards Ltd | Wholesale & retail | 2026 |
| BDM Fitness Limited | Other services | 2021 |
| BE Property Services Ltd | Construction | 2024 |
| Beachcroft Construction Services Limited | Professional & scientific | 2024 |
| Beachcroft Management Services Limited | Real estate | 2025 |
| Beacon Farm Forestry Limited | Agriculture & fishing | 2021 |
| Bean Supplies Limited | Administrative & support | 2019 |
| Beard Meister Ltd | Wholesale & retail | 2022 |
| Beattie Scaffolding Ltd | Construction | 2022 |
| Beck Farm Trading Limited | Agriculture & fishing | 2020 |
| Beck Prosper Limited | Manufacturing | 2004 |
| Beddoes Scaffolding Ltd | Construction | 2024 |
| BEE (Midlands) Limited | Extraterritorial | 2019 |
| Beebee Distribution Ltd | Wholesale & retail | 2022 |
| Beer and Banter Ltd | Hospitality | 2015 |
| Bella Capelli Limited | Other services | 2003 |
| BEN Cooke Construction Ltd | Construction | 2015 |
| BEN Love (Holdings) Ltd | Administrative & support | 2020 |
| Benchmark Site Management & Engineering Ltd | Administrative & support | 2014 |
| Bendito Holdings Limited | Financial services | 2019 |
| Bennetts Construction Worcestershire Ltd | Construction | 2022 |
| Bennetts Property Worcestershire Limited | Real estate | 2025 |
| Bernard Moseley Kidz Entertainment Limited | Arts & recreation | 2023 |
| Bespoke Liners Ltd | Manufacturing | 2009 |
| Bespoke Wigs by Justine Ltd | Other services | 2024 |
| BESPOKE52 Ltd | Extraterritorial | 2023 |