| Abad Property Management Ltd | Real estate | 2026 |
| Abalchemy Ltd | Wholesale & retail | 2015 |
| Abara’S Spot Limited | Wholesale & retail | 2025 |
| Abarna Beauty World Ltd. | Other services | 2017 |
| Abarna Silks Limited | Wholesale & retail | 2016 |
| Abbas Investment and Properties Ltd | Real estate | 2025 |
| Abbey Corn Mill (Whalley) Management Limited | Households | 2002 |
| Abbey Dental Supplies Limited | Manufacturing | 2024 |
| Abbey House (Bath) Management Company Limited | Households | 1987 |
| Abbey House Management Company Limited | Households | 1995 |
| Abbey Motorsport Limited | Wholesale & retail | 2001 |
| Abbey Place (West Horsley) Management Company Limited | Households | 2021 |
| Abbey Road P.O. Limited | Wholesale & retail | 2022 |
| Abbeydale Management Company Limited | Households | 1988 |
| Abbeyvale Property Limited | Households | 2005 |
| Abbeywood Practice Limited | Health & social care | 2016 |
| Abbijoe Limited | Wholesale & retail | 1995 |
| Abbots Asset Holdings Limited | Real estate | 2019 |
| Abbots Gate (Stafford) Management Company Limited | Households | 2005 |
| Abbots Yard Residents Company Limited | Households | 2005 |
| Abbott Technologies International Ltd | Information & communication | 2018 |
| Abbotts & Regency Limited | Information & communication | 2013 |
| Abbotts Mews (Cheam) Limited | Households | 1990 |
| Abbotts Mews (Little Lever) Management Company Limited | Households | 2006 |
| Abbotts Wharf Management Limited | Households | 2003 |
| Abbydec Ltd | Administrative & support | 2026 |
| ABC Bath-Monika Grzegorz Domoradzcy Ltd | Wholesale & retail | 2010 |
| ABC Steelproducts Ltd | Wholesale & retail | 2015 |
| Abco Doors & Windows Limited | Wholesale & retail | 2004 |
| Abco London Ltd | Real estate | 2017 |
| ABCR2 Ltd | Hospitality | 2020 |
| ABD Brothers Ltd | Wholesale & retail | 2026 |
| Abdn Construction Resources Ltd | Construction | 2018 |
| Abdoulaye Services Limited | Construction | 2025 |
| Abdul Salam Cars Trucks & Dump Trucks Selling Ltd | Wholesale & retail | 2021 |
| ABE Homes Ltd | Real estate | 2024 |
| Abeera Limited | Administrative & support | 2013 |
| Abel & Wagstaff Limited | Arts & recreation | 2019 |
| Aberdeen Carseat Covers Ltd | Wholesale & retail | 2025 |
| Aberdeen House Residents Limited | Households | 1989 |
| Abernethy Court RTM Ltd | Households | 2009 |
| Abervill Estates Limited | Real estate | 1939 |
| Abery Ltd | Information & communication | 2022 |
| Abeyie Innovation Ltd | Information & communication | 2025 |
| ABFS2 Limited | Financial services | 2020 |
| Abhiadi Solutions Ltd | Information & communication | 2018 |
| ABI Children’S Home Limited | Hospitality | 2025 |
| Abia Daughters UK & Ireland Limited | Other services | 2019 |
| Abiana Autos UK Ltd | Wholesale & retail | 2012 |
| Abibarath UK Limited | Wholesale & retail | 2013 |
| Abilities HR Limited | Administrative & support | 2024 |
| Ability Rehab Limited | Health & social care | 2023 |
| Abimbs Ltd | Administrative & support | 2018 |
| Abingdon Court Management Company Limited | Households | 2003 |
| Abington Park House Management Company Limited | Households | 1975 |
| Abiraa Limited | Hospitality | 2023 |
| Abitomi Services Ltd | Other services | 2021 |
| Abjac Developments Limited | Real estate | 1973 |
| Able & Young International Ltd | Professional & scientific | 2020 |
| Able & Young Limited | Professional & scientific | 2006 |
| Able Trading Co. (Crawley) Limited | | 1982 |
| Able Waste Services Limited | Water & waste | 2012 |
| ABM Electrical Distributors Limited | Wholesale & retail | 1993 |
| ABM Roofing & Building Ltd | Construction | 2021 |
| Abmb Properties Limited | Real estate | 2025 |
| Abode Development Investments Limited | Construction | 2011 |
| Abound Electronics Ltd. | Information & communication | 2011 |
| Above ALL Tree Care Limited | Administrative & support | 2026 |
| Above N Below Rigging Ltd. | Construction | 2015 |
| ABP Travels Ltd | Administrative & support | 2025 |
| ABQ Events Ltd | Hospitality | 2024 |
| ABS Day and Night Nurseries Ltd | Health & social care | 2025 |
| Absolute Insurance Brokers Limited | Financial services | 2008 |
| Absolute Productions Limited | Hospitality | 2001 |
| Absolutely ALL Cars Ltd | Wholesale & retail | 2024 |
| Abyssinian Beauty Products Limited | Manufacturing | 2020 |
| AC Heating & GAS Safety Solution Ltd | Construction | 2020 |
| AC Homes and Consultancy Limited | Professional & scientific | 2025 |
| AC Pharm Limited | Health & social care | 2024 |
| AC Trading Limited | Wholesale & retail | 2023 |
| ACA Aspvkm Maintenance Ltd | Construction | 2019 |
| ACA Aspvm Group Ltd | Construction | 2013 |
| ACA Associates Ltd | Professional & scientific | 2024 |
| Acaciaexotics Ltd | Wholesale & retail | 2024 |
| Academic & Professional Development Center (Apdc) Ltd | Education | 2022 |
| Academic Intelligence Ltd | Information & communication | 2026 |
| Academy of Astrology Ltd | Education | 2008 |
| Academy of Higher Education Ltd | Education | 2011 |
| Academy Surfacing Ltd | Construction | 2019 |
| Acaelus Limited | Other services | 2016 |
| Acardia Limited | Wholesale & retail | 2024 |
| ACC Education Ltd | Administrative & support | 2024 |
| Acceptor Limited | Professional & scientific | 2024 |
| Accman & Co. Accountants Limited | Professional & scientific | 2003 |
| Accolade Care Services UK Limited | Health & social care | 2001 |
| Accolade Care Supported Living Limited | Health & social care | 2024 |
| Accountancy Business Associates Ltd | Professional & scientific | 2006 |
| Accountancy Divisions (City) LLP | | 2008 |
| Accountants Croydon Limited | Professional & scientific | 2020 |
| Accountify Ltd | Professional & scientific | 2015 |