| AAP Floorcare Ltd | Construction | 2026 |
| Aapli Mumbai Street Food Limited | Hospitality | 2026 |
| Aaqib Abbas Ltd | Wholesale & retail | 2025 |
| AAR Marketing Ltd | Professional & scientific | 2026 |
| Aarham Info Tech Limited | Information & communication | 2021 |
| Aarna North West Ltd | Real estate | 2025 |
| Aarnyx Labs Ltd | Information & communication | 2026 |
| Aaron Malcolm Ltd | Real estate | 2021 |
| Aaron Remikie Limited | Other services | 2025 |
| Aaron's Landscaping & Gardening Ltd | Other services | 2019 |
| Aarvn IT Ltd | Information & communication | 2018 |
| Aavi Associates Ltd | Health & social care | 2023 |
| Aayesha Food Limited | Hospitality | 2024 |
| Aazam Trading Limited | Wholesale & retail | 2026 |
| AB Air Conditioning and Refrigeration Ltd | Manufacturing | 2016 |
| AB Avon Limited | Transport & logistics | 2015 |
| AB Building&Maintenance Ltd | Construction | 2018 |
| AB Communications Limited | Information & communication | 2024 |
| AB Corporate Finance Ltd | Professional & scientific | 2007 |
| AB Development Services Ltd | Professional & scientific | 2024 |
| AB Facilities Consultants Ltd | Real estate | 2026 |
| AB Fitout Limited | Construction | 2013 |
| AB Flagging Ltd | Construction | 2022 |
| AB Imaging Ltd | Professional & scientific | 2022 |
| AB Infrastructure Ltd | Water & waste | 2018 |
| AB Joinery Services Limited | Construction | 2021 |
| AB Luxuries Limited | Real estate | 2020 |
| AB Property Holdings Group Limited | Financial services | 2024 |
| AB Property Solutions Ltd | Construction | 2025 |
| AB Quality Repair Ltd | Wholesale & retail | 2026 |
| AB Supplements Ltd | Wholesale & retail | 2023 |
| AB Telecoms Ltd | Information & communication | 2021 |
| AB Top Ltd | Wholesale & retail | 2026 |
| AB Trent Limited | Transport & logistics | 2015 |
| Ab&C Safety Consultants Limited | Professional & scientific | 2025 |
| AB700 Ltd | Professional & scientific | 2012 |
| Abaarco Limited | Wholesale & retail | 2023 |
| Abab Group Ltd | Information & communication | 2026 |
| Abaca Healthstore Limited | Wholesale & retail | 2014 |
| Abacus Build & Design Ltd | Construction | 2023 |
| Abacus Engineering Supplies Ltd | Wholesale & retail | 2015 |
| Abacus Liverpool Ltd | Professional & scientific | 2026 |
| Abacus Property Maintenance (Liverpool) Ltd | Construction | 2006 |
| Abben Services Limited | Financial services | 2025 |
| Abbercom Limited | Professional & scientific | 2002 |
| Abberton Building Services Limited | Construction | 2018 |
| Abberton Construction Ltd | Construction | 2026 |
| Abbey Builders Limited | Construction | 2021 |
| Abbey Building and Maintenance Ltd | Construction | 2023 |
| Abbey Damp Liverpool Ltd | Construction | 2022 |
| Abbey ENG LLP | | 2008 |
| Abbey Gardens Limited | Construction | 2024 |
| Abbey Group Industrial Services Limited | Manufacturing | 2017 |
| Abbey Group International Limited | Manufacturing | 2016 |
| Abbey Group Protect Limited | Manufacturing | 2018 |
| Abbey Integrated Welfare Limited | Health & social care | 2016 |
| Abbey Lloyd Limited | Information & communication | 2019 |
| Abbey Manor (Buildwas) Limited | Hospitality | 2018 |
| Abbey Road Wine Bar Ltd | Hospitality | 2017 |
| Abbeystead (Northwest) Ltd | Real estate | 2004 |
| Abbeystead Care Ltd | Real estate | 2004 |
| Abbeystead Construction Ltd | Construction | 2021 |
| Abbeystead Group Limited | Financial services | 2017 |
| Abbeystead Holiday Lets Limited | Hospitality | 2024 |
| Abbeystead Projects (Design and Build) Limited | Construction | 1986 |
| Abbies Cleaning Limited | Administrative & support | 2025 |
| Abbie’S Kitchen & Lounge Ltd | Hospitality | 2025 |
| Abbigate NW Limited | Financial services | 2003 |
| Abbotsford Court 2026 Limited | Households | 2026 |
| Abbotsford Road Freehold Limited | Real estate | 2020 |
| Abbott Debt Recovery Ltd | Extraterritorial | 2005 |
| Abbs Civil Construction Limited | Construction | 2019 |
| Abbys Cafe Ltd | Hospitality | 2024 |
| ABC Accounting Ltd | Professional & scientific | 2015 |
| ABC Business Services UK Limited | Professional & scientific | 2025 |
| ABC Case Management Services Ltd | Professional & scientific | 2012 |
| ABC Gym Limited | Arts & recreation | 2019 |
| ABC Property Services Limited | Real estate | 2017 |
| ABC Security Services Ltd | Construction | 2008 |
| ABC Shopping Limited | Construction | 2012 |
| Abcd Community Services Limited | Administrative & support | 2011 |
| Abcd Recruit Limited | Administrative & support | 2026 |
| Abcs CMG CIC | Arts & recreation | 2023 |
| ABD AL Rahman Catering Ltd | Hospitality | 2020 |
| Abdi Properties Limited | Real estate | 2020 |
| Abdo Sukari Ltd | Professional & scientific | 2020 |
| Abdu Ecom 6 Ltd | Wholesale & retail | 2025 |
| Abdual Ltd | Wholesale & retail | 2025 |
| Abdul SAM Ltd | Wholesale & retail | 2025 |
| Abedo Prive Ltd | Administrative & support | 2026 |
| Abel Business Enterprises Ltd | Construction | 2000 |
| Abel Glazing Ltd | Construction | 2025 |
| Abels Ecommerce Ltd | Wholesale & retail | 2026 |
| Abeni Lane Ltd | Wholesale & retail | 2025 |
| Aber Ltd | Administrative & support | 2016 |
| Aberdeen Engineering Solutions Ltd | Professional & scientific | 2013 |
| Aberdeen Foam Limited | Professional & scientific | 2002 |
| Aberikebab Ltd | Manufacturing | 2024 |
| Aberko Engineering Limited | | 1984 |
| ABERRY237 Ltd | Health & social care | 2025 |