| AB Trades Limited | Wholesale & retail | 2025 |
| Ab&Fa Solutions Ltd | Wholesale & retail | 2025 |
| AB80 Ltd | Professional & scientific | 2026 |
| ABA Lettings Ltd | Real estate | 2020 |
| Abaco Build Limited | Construction | 2024 |
| Abacross Limited | Information & communication | 2016 |
| Abacus (Bristol) Limited | Water & waste | 1988 |
| Abacus Commercial Services Ltd | Administrative & support | 2021 |
| Abacus Homes (Bristol) Limited | Real estate | 2025 |
| Abacus Legal and Mediation Services Ltd | Administrative & support | 2012 |
| Abacus Red Limited | Real estate | 2009 |
| Abacus Therapeutics Ltd | Extraterritorial | 2026 |
| Abad Global Limited | Wholesale & retail | 2025 |
| Abal Insight Ltd | Professional & scientific | 2011 |
| Abalulu Education Limited | Education | 2021 |
| Abamog Ltd | Information & communication | 2024 |
| Abanaki (UK) Limited | Manufacturing | 2000 |
| Abaris Consulting Limited | Professional & scientific | 2013 |
| Abashars Ltd | Wholesale & retail | 2023 |
| Abaview Property Relocations Ltd | Real estate | 2021 |
| Abbadi Surgical Consulting Limited | Health & social care | 2025 |
| Abbas Tool Hire Ltd | Administrative & support | 2024 |
| Abbas Windows and Doors Limited | Construction | 2015 |
| Abbassi Properties Ltd | Real estate | 2018 |
| Abberley Data & Electrical Ltd | Construction | 2018 |
| Abberwick Limited | Professional & scientific | 2018 |
| Abbeville Cafes Ltd | Hospitality | 2019 |
| Abbey & Hamilton Limited | Health & social care | 2016 |
| Abbey Building (SW) Limited | Construction | 2014 |
| Abbey Communication Ltd | Education | 2013 |
| Abbey Communication Training Ltd | Education | 2024 |
| Abbey Cottage Residents Management Company Limited | Administrative & support | 2004 |
| Abbey GAS Services Limited | Construction | 2002 |
| Abbey Gateway Productions Limited | Information & communication | 2004 |
| Abbey House (Cambridge) Ltd. | Real estate | 1998 |
| Abbey House Stores Ltd | Wholesale & retail | 2022 |
| Abbey Kitchens (Bath) Limited | Manufacturing | 2002 |
| Abbey Lifts Limited | Construction | 1982 |
| Abbeyfield Bristol and Keynsham Society | Health & social care | 1966 |
| Abbeyfield Homes Limited | Real estate | 2023 |
| Abbeymoor Veterinary Centres Limited | Extraterritorial | 2012 |
| Abbeywood Estates Limited | Real estate | 2000 |
| Abbie House Management Committee Limited | Households | 2005 |
| Abbie Mechanical Ltd | Construction | 2025 |
| Abbie's Café Limited | Hospitality | 2023 |
| Abbishvision Properties Limited | Professional & scientific | 2021 |
| Abbots Gate (Bristol) Management Limited | Households | 1993 |
| Abbots Investments Limited | Financial services | 1990 |
| Abbots Leigh Dairy Limited | Manufacturing | 2014 |
| Abbots Leigh Kennels Limited | Extraterritorial | 2017 |
| Abbots Way Management Company Limited | Households | 2016 |
| Abbotsford Road Limited | Real estate | 2007 |
| Abbotskerswell Veterinary Centre Limited | Extraterritorial | 2016 |
| Abbotswood Controls Ltd | Construction | 2009 |
| Abbotswood Management Company Limited | Households | 1983 |
| Abbotswood Veterinary Centre Ltd. | Professional & scientific | 2015 |
| Abbott Grab Hire Ltd | Water & waste | 2019 |
| Abbott Skip Hire Limited | Water & waste | 2012 |
| Abby Gjames Ltd | Public administration | 2023 |
| ABC Bathrooms Limited | Wholesale & retail | 2021 |
| ABC Blinds (South West) Limited | Manufacturing | 2004 |
| ABC Church Road Management Company Limited | Real estate | 2019 |
| ABC Detailing Ltd | Wholesale & retail | 2020 |
| ABC Hair Company Limited | Other services | 2010 |
| ABC Learning Options Limited | Education | 2026 |
| ABC Recruitment & Training Ltd | Administrative & support | 2016 |
| ABC Solutions Limited | Professional & scientific | 2003 |
| ABC Utilities Bristol Ltd | Construction | 2023 |
| Abcd Property Finance Ltd | Financial services | 2025 |
| Abce Limited | Administrative & support | 2007 |
| Abcl Properties Limited | Real estate | 2020 |
| Abdb Enterprise Limited | Transport & logistics | 2025 |
| ABDIRAHMAN84 Ltd | Wholesale & retail | 2022 |
| Abdisalam Logistics Limited | Transport & logistics | 2019 |
| Abdul Kabir Ltd | Wholesale & retail | 2021 |
| Abdullah Bashir Ltd | Wholesale & retail | 2024 |
| Abdus Salam Ltd | Wholesale & retail | 2026 |
| ABE Orchard Limited | Information & communication | 2015 |
| Abeeha Enterprises Limited | Wholesale & retail | 2018 |
| Abei Energy Green I Limited | Energy | 2021 |
| Abei Energy Green II Limited | Energy | 2021 |
| Abei Energy Green III Limited | Energy | 2021 |
| Abei Energy Green IV Limited | Energy | 2021 |
| Abei Energy Green IX Ltd | Energy | 2022 |
| Abei Energy Green V Limited | Energy | 2021 |
| Abei Energy Green VI Limited | Energy | 2022 |
| Abei Energy Green VII Ltd | Energy | 2022 |
| Abei Energy Green Viii Ltd | Energy | 2022 |
| Abei Energy Green X Ltd | Energy | 2022 |
| Abei Energy Limited | Energy | 2019 |
| Abel IT Solutions Ltd | Information & communication | 2018 |
| Abel Moreira Holding Ltd | Health & social care | 2025 |
| Abellinger Consulting Limited | Education | 2019 |
| Aberarder Estate Limited | Agriculture & fishing | 2023 |
| Aberdar Consulting Services Limited | Information & communication | 2025 |
| Aberdare Estates Limited | Construction | 2019 |
| Aberdare NO 1 Limited | Construction | 2026 |
| Abergavenny Facilities Limited | Real estate | 1998 |
| Abertawe Climbing Ltd | Arts & recreation | 2021 |
| Abes Properties UK Ltd | Real estate | 2019 |