| AB Cars Sales Ltd | Wholesale & retail | 2026 |
| AB Consultancy and Management Limited | Professional & scientific | 2021 |
| AB Horizon Limited | Wholesale & retail | 2025 |
| AB Joinery Kitchens & Bedrooms Limited | Manufacturing | 2017 |
| AB Marketing (Consultancy) Services Ltd | Administrative & support | 2020 |
| AB Probuild Ltd | Construction | 2025 |
| AB Tamsin Ltd | Other services | 2018 |
| ABA Care and Investment Services Ltd | Health & social care | 2021 |
| ABA Investments Limited | Agriculture & fishing | 2015 |
| Abamaba Company Limited | Wholesale & retail | 2024 |
| Abandon US LLP | | 2022 |
| Abar Home Care Service Ltd | Health & social care | 2026 |
| Abax UK Limited | Manufacturing | 2011 |
| Abba Services Limited | Administrative & support | 2026 |
| Abba's Autos Ltd | Wholesale & retail | 2009 |
| Abbey Developments (Peterborough) Limited | Construction | 2014 |
| Abbey Fire Systems Ltd | Public administration | 2025 |
| Abbey Hampton Management Company Limited | Households | 2016 |
| Abbey Trading Limited | Hospitality | 2015 |
| Abbeyfields Bourne Management Company Limited | Households | 2013 |
| Abbeyfields Open Space Management Company Limited | Households | 2013 |
| Abbeyside Limited | Construction | 2020 |
| Abbeythorne Services Company Limited | Professional & scientific | 2023 |
| Abblitt & Co Ltd | Real estate | 2005 |
| Abblitt (Whittlesey) Limited | Professional & scientific | 2021 |
| Abbymajuta Ltd Limited | Health & social care | 2014 |
| ABC Business Support Services, Peterborough Ltd | Administrative & support | 2013 |
| ABC International Marketing Limited | Administrative & support | 2015 |
| Abdelliexpress Limited | Transport & logistics | 2019 |
| Abdul Ahad Trading & Co Ltd | Wholesale & retail | 2026 |
| Abdul Group of Companies Ltd | Wholesale & retail | 2021 |
| Abdul Property Services Ltd | Real estate | 2018 |
| ABE Trans Ltd | Transport & logistics | 2023 |
| Abel Exterior Solutions Ltd | Construction | 2017 |
| Abercrombie Partners Ltd | Professional & scientific | 2013 |
| Abhange Software Services Limited | Information & communication | 2014 |
| Abhi's Kitchen Ltd | Hospitality | 2023 |
| ABI Law Limited | Professional & scientific | 2013 |
| Abi's Trans Ltd | Transport & logistics | 2020 |
| Abia State Indigenes in Diaspora UK & Eire Ltd | Other services | 2017 |
| Abia State Union UK Ltd | Education | 2025 |
| Abibra Properties Limited | Households | 2025 |
| Abif Limited | Wholesale & retail | 2020 |
| Ability International Limited | Manufacturing | 1986 |
| Ability World Limited | Wholesale & retail | 2009 |
| Abiodun Ayanda Ltd | Wholesale & retail | 2024 |
| Abisa Elements Trading Limited | Wholesale & retail | 2024 |
| Abisla Building Services Limited | Construction | 2020 |
| Abisla Property Ltd | Households | 2019 |
| Abisla Whittlesey Limited | Real estate | 2019 |
| Abit of Everything Ltd | Wholesale & retail | 2026 |
| ABK Accountancy Limited | Professional & scientific | 2013 |
| ABL77 Ltd | Real estate | 2025 |
| Able 4 Carpentry Limited | Construction | 2007 |
| Able Fitness (Peterborough) Limited | Arts & recreation | 2022 |
| Ableclean Contract Services Ltd | Administrative & support | 2003 |
| Ablm Associates Ltd | Professional & scientific | 2023 |
| Ablm Associates UK Ltd | Professional & scientific | 2012 |
| ABM Electrical Ltd | Construction | 2023 |
| ABM Trans Ltd | Transport & logistics | 2020 |
| Abms Enterprise Ltd | Wholesale & retail | 2025 |
| About ME Care and Support Limited | Extraterritorial | 2012 |
| About That Security Ltd | Public administration | 2025 |
| Abouturn Consultancy Limited | Professional & scientific | 2023 |
| Abraham Estates Ltd. | Real estate | 1989 |
| Abrojam Unlimited Ltd | Health & social care | 2022 |
| Absham Ltd | Wholesale & retail | 2022 |
| Absolut Security Solutions UK Limited | Manufacturing | 2009 |
| Absolute Cricket Ltd | Wholesale & retail | 2023 |
| Absolute Fitness Trading Ltd | Arts & recreation | 2019 |
| Absolute Motors Limited | Wholesale & retail | 2020 |
| Absolute Property Development Ltd | Construction | 2015 |
| Absolute Property Trading Ltd | Construction | 2022 |
| Absq Accounting Ltd | Professional & scientific | 2015 |
| Abstract AI Ltd | Information & communication | 2025 |
| Abstract Developments Limited | Hospitality | 2008 |
| Abus 786 Ltd | Other services | 2023 |
| Abyr Ltd | Transport & logistics | 2019 |
| ABZ (CRW) Ltd | Hospitality | 2025 |
| AC Food Consulting Limited | Professional & scientific | 2021 |
| AC Holdings & Investments Limited | Financial services | 2024 |
| AC Motors (UK) Limited | Wholesale & retail | 2013 |
| AC Protective Solutions Ltd | Administrative & support | 2025 |
| AC84 Investments Ltd | Real estate | 2025 |
| Acab Transport Ltd | Administrative & support | 2015 |
| Acacia Children's Services Limited | Health & social care | 2023 |
| Academic Health Solutions Ltd | Administrative & support | 2014 |
| Acaet Ltd | Real estate | 2016 |
| Acanthus Care Group Limited | Health & social care | 2026 |
| ACB Project Consultancy Ltd | Professional & scientific | 2023 |
| ACC Healthcare Limited | Health & social care | 2024 |
| Accelerate Marketing Limited | Professional & scientific | 2001 |
| Accent Living Ltd | Real estate | 2021 |
| Accessorieshub Ltd | Wholesale & retail | 2025 |
| Accessory for Less Limited | Wholesale & retail | 2023 |
| Accident Assistance (Peterborough) Ltd | Administrative & support | 2014 |
| Accident Specialists Credit Hire Ltd | Administrative & support | 2018 |
| Accm Flooring Limited | Construction | 2018 |
| Accountancy & Corporate Expertise Limited | Professional & scientific | 2010 |
| Accountancy & Management Consultancy Ltd | Professional & scientific | 2020 |