| Aclo Assets KS Limited | Real estate | 2026 |
| Aclo Assets Ltd | Real estate | 2022 |
| Aclo Assets MH Ltd | Real estate | 2025 |
| ACM Direct Ltd | Professional & scientific | 2017 |
| ACM Events Entertainment Ltd | Administrative & support | 2025 |
| ACM Northwest Limited | Construction | 2024 |
| ACM Window Cleaning Ltd | Administrative & support | 2024 |
| Acme Integrated Services Limited | Households | 2024 |
| Acme Marketing UK Limited | Professional & scientific | 2017 |
| Acmecn Co., Ltd. | Wholesale & retail | 2014 |
| Acmefog Commerce Ltd | Wholesale & retail | 2021 |
| Acmj | Real estate | 2022 |
| ACN Law Limited | Professional & scientific | 2017 |
| ACN Management Ltd | Professional & scientific | 2024 |
| ACN Rail Ltd | Other services | 2020 |
| ACO Accounting Services Ltd | Professional & scientific | 2022 |
| ACO Estate Ltd | Real estate | 2024 |
| ACO Homes Ltd | Real estate | 2024 |
| ACO Management Ltd | Real estate | 2020 |
| Acom Property Limited | Real estate | 2013 |
| Acomb Road Property Management Company Limited | Households | 2013 |
| Acomx Limited | Wholesale & retail | 2023 |
| Acon for Trading Ltd | Wholesale & retail | 2021 |
| Aconique Holdings Ltd | Real estate | 2025 |
| Aconique Ltd | Administrative & support | 2021 |
| Acorn Bidco Limited | Financial services | 2017 |
| Acorn Building and Improvements Ltd | Construction | 2023 |
| Acorn Business Centre Ltd | Real estate | 2023 |
| Acorn Cleaning Manchester Limited | Administrative & support | 2020 |
| Acorn Community Projects Ltd | Other services | 2023 |
| Acorn Complete Limited | Construction | 2007 |
| Acorn Corporate Solutions Ltd | Real estate | 2022 |
| Acorn Doors Glazing Ltd | Manufacturing | 2025 |
| Acorn Doors Ltd | Manufacturing | 2021 |
| Acorn Environment Services Limited | Administrative & support | 1990 |
| Acorn Fixings Limited | Wholesale & retail | 1986 |
| Acorn GAS Services Limited | Construction | 2005 |
| Acorn Grounds Maintenance and Landscaping Ltd | Administrative & support | 2024 |
| Acorn Group Holdings Limited | Financial services | 1992 |
| Acorn Investigations Limited | Administrative & support | 1998 |
| Acorn Investments (Leigh) Limited | Real estate | 2005 |
| Acorn Investments (North West) Limited | Real estate | 2008 |
| Acorn MED Limited | Health & social care | 2017 |
| Acorn Prime Estates Ltd | Real estate | 2026 |
| Acorn Series 1 Income Limited Partnership | | 2010 |
| Acorn Sports Limited | Wholesale & retail | 2024 |
| Acorn to Oaks Properties Limited | Real estate | 2020 |
| Acorn Topco Limited | Financial services | 2017 |
| Acorn Wise Group Limited | Other services | 2020 |
| Acornfield Properties (Durham) Limited | Real estate | 2025 |
| Acornfield Properties Ltd | Real estate | 2020 |
| Acostruct Ltd | Professional & scientific | 2024 |
| Acoustic Design Library Consulting Ltd | Professional & scientific | 2026 |
| Acoustic Design Library Ltd | Extraterritorial | 2022 |
| Acoustic Hardware Limited | Professional & scientific | 2016 |
| Acoustiks Ltd | Manufacturing | 2018 |
| ACP (North West) Limited | Administrative & support | 2007 |
| ACP Child Minding Limited | Education | 2022 |
| ACP Holdings Ltd | Financial services | 2025 |
| ACP Promo Ltd | Wholesale & retail | 2025 |
| ACP Response Ltd | Health & social care | 2023 |
| Acquiesse Limited | Wholesale & retail | 2005 |
| Acquire Property North West Ltd | Real estate | 2022 |
| Acquirtal Holdings Limited | Real estate | 2022 |
| Acquirtal Limited | Real estate | 2022 |
| Acquisition 395445695A Limited | Wholesale & retail | 2010 |
| ACR S.A. Ltd. | Extraterritorial | 2024 |
| Acr:Mcr Limited | Arts & recreation | 2016 |
| Acre & Legacy II Ltd | Real estate | 2022 |
| Acre & Legacy Ltd | Real estate | 2022 |
| Acre Ascent Ltd | Education | 2026 |
| Acre Court Care Home Ltd | Health & social care | 2024 |
| Acre Properties (NW) Ltd | Real estate | 2026 |
| Acregate Property Ltd | Real estate | 2022 |
| Acrehowe Limited | Construction | 2025 |
| Acremart Limited | Wholesale & retail | 2026 |
| Acres Estates Property & Lettings Management Limited | Real estate | 2015 |
| Acres Lane SPV Limited | Real estate | 2022 |
| Acro Services Ltd | Administrative & support | 2008 |
| Acronis-Partner Ltd | Extraterritorial | 2020 |
| Acropolis London Limited | Real estate | 2025 |
| Acros Furniture Ltd | Wholesale & retail | 2024 |
| Across the Global Limited | Education | 2022 |
| Across Ummah CIC | Public administration | 2022 |
| Acrow Storage Equipment Limited | | 1964 |
| Acrux Systems Limited | Other services | 2022 |
| ACS Consult Ltd | Information & communication | 2025 |
| ACS Equity Group Limited | Financial services | 2025 |
| ACS Multi Utility Limited | Construction | 2008 |
| ACS Property Group Limited | Real estate | 2025 |
| ACS Skip Hire (MCR) Limited | Water & waste | 2010 |
| ACS Skip Hire Limited | Administrative & support | 2009 |
| Acst Medical Ltd | Health & social care | 2015 |
| Acstrom Ltd | Professional & scientific | 2026 |
| ACT Art Productions Limited | Administrative & support | 2021 |
| ACT Assist Ltd | Professional & scientific | 2016 |
| ACT Brett Installations Ltd | Construction | 2007 |
| ACT Building Control Limited | Professional & scientific | 2005 |
| ACT Group Limited | Water & waste | 2024 |
| ACT Property Developments Limited | Construction | 2019 |