| AB1 Financial Planning Ltd | Financial services | 2004 |
| AB56 Limited | Agriculture & fishing | 2019 |
| ABA Assets Limited | Real estate | 2016 |
| ABA Dent Ltd | Health & social care | 2024 |
| Abacab Two Limited | Professional & scientific | 2001 |
| Abaco Taxis Ltd | Extraterritorial | 2011 |
| Abacus Commercial Ltd | Real estate | 2007 |
| Abacus Financial Marketing Limited | Professional & scientific | 1999 |
| Abalon Investments LP | | 2020 |
| Abalton Properties Ltd | Real estate | 2021 |
| Abandoned Artists CIC | Education | 2023 |
| Abarbala Ltd | Information & communication | 2023 |
| Abas Marketing Ltd | Professional & scientific | 2022 |
| ABB Capital LP | | 2015 |
| ABB FIX Ltd | Construction | 2025 |
| ABB Leap Logistic LP | | 2016 |
| Abba Throne Limited | Wholesale & retail | 2025 |
| Abbanoy Logistics Limited | Wholesale & retail | 2002 |
| Abbasi Global Ltd | Wholesale & retail | 2022 |
| Abbasi Private Hire LP | | 2011 |
| Abbasi PVT Hire Ltd | Administrative & support | 2023 |
| Abbastanza LP | | 2014 |
| Abbey (UK) Travel Limited | Administrative & support | 2008 |
| Abbey Constructors Group | | 1994 |
| Abbey Consultants LP | | 2016 |
| Abbey Flooring (Scotland) Ltd | Wholesale & retail | 2019 |
| Abbey Global L.P. | | 2016 |
| Abbey Industrial L.P. | | 2012 |
| Abbey Intertrade L.P. | | 2012 |
| Abbey Project Ltd | Construction | 2025 |
| Abbey Removals & Storage (Perth) Limited | Transport & logistics | 2007 |
| Abbey Road (Barnsley) LP | | 2007 |
| Abbeyford Leisure Limited | Hospitality | 2011 |
| Abbeygrove Properties L.P. | | 2009 |
| Abbeyhill Footcare Limited | Health & social care | 2014 |
| Abbeyline Investments L.P. | | 2010 |
| Abbeymill Business Centre Limited | Real estate | 2017 |
| Abbeymount Estates Limited | Construction | 2016 |
| Abbeymount Media Limited | Professional & scientific | 2003 |
| Abbeyvale Investments L.P. | | 2011 |
| Abbeyview Investment Partners Limited | Real estate | 2024 |
| Abbeywood Corporation L.P. | | 2012 |
| Abbing SC Ltd | Professional & scientific | 2025 |
| Abbot Investment Trading (Scotland) Partnership SP | | 2022 |
| Abbotsford Advisory Ltd | Professional & scientific | 2022 |
| Abbotsford Guest House Ltd | Hospitality | 2023 |
| Abbotshaugh Property Limited | Real estate | 2003 |
| Abbotsinch WSM Limited | Administrative & support | 2012 |
| Abbott Supply Company L.P. | | 2010 |
| Abbott UK Enterprises Limited Partnership | | 2021 |
| Abbs Property Investments Ltd | Real estate | 2024 |
| ABC (EDI) Ltd | Professional & scientific | 2022 |
| ABC Alliance LP | | 2017 |
| ABC Capital LP | | 2022 |
| ABC Chinese Takeaway Limited | Hospitality | 2016 |
| ABC Edin Limited | Hospitality | 2025 |
| ABC Holdings (Edin) Ltd | Real estate | 2019 |
| ABC International Group LP | | 2019 |
| ABC Invest LP | | 2015 |
| ABC Investments (Edin) Ltd | Real estate | 2021 |
| ABC Legal Limited | Professional & scientific | 2025 |
| ABC Management Services | Real estate | 1985 |
| ABC Marine LP | | 2016 |
| ABC Schools (Holdings) Limited | Professional & scientific | 2005 |
| ABC Schools Limited | Administrative & support | 2005 |
| ABC Success LP | | 2015 |
| ABC Technology L.P. | | 2008 |
| Abc-Accessories Ltd | Wholesale & retail | 2017 |
| Abcg Ltd | Other services | 2024 |
| Abcpt Ltd | Health & social care | 2023 |
| Abdive Offshore Services Limited | Professional & scientific | 2003 |
| Abdm Ltd | Wholesale & retail | 2025 |
| Abdul and Brother Ltd | Hospitality | 2024 |
| Abdul Halal Market Ltd | Wholesale & retail | 2019 |
| Abdulbutt Ltd | Wholesale & retail | 2024 |
| Abdullah Saleh and Partners for Trading Ltd | Wholesale & retail | 2024 |
| Abdush Foods Limited | Hospitality | 2025 |
| ABE Consulting Ltd | Professional & scientific | 2021 |
| Abeamus Ltd | Professional & scientific | 2020 |
| Abek Contracts Limited | Construction | 2023 |
| Abel & Co Services Ltd | Information & communication | 2007 |
| Abel Tasman Limited | Real estate | 2023 |
| Abela Group LP | | 2017 |
| Abeli Corporate LP | | 2018 |
| Abelina Alliance LP | | 2018 |
| Abella Global LP | | 2015 |
| Abelo Aviation Servicing UK Limited | Administrative & support | 2015 |
| Abeltra Project LP | | 2016 |
| Aben Management LP | | 2017 |
| Aber Management Company Ltd | Extraterritorial | 2012 |
| Aberarder Partnership LLP | | 2015 |
| Abercairn Limited | Hospitality | 1994 |
| Abercastle Investments Limited | Professional & scientific | 1985 |
| Abercastle NV Limited | Administrative & support | 2008 |
| Abercastle Property Holdings Limited | Construction | 1994 |
| Abercorn Care Limited | Administrative & support | 1996 |
| Abercorn Cctv Limited | Information & communication | 2016 |
| Abercorn Funeral Services Limited | Other services | 1962 |
| Abercorn Portfolio Ltd | Construction | 2026 |
| Abercrombie Property Management Limited | Real estate | 1999 |