| Abax Consultants Limited | Professional & scientific | 2025 |
| Abba Utilities Ltd | Construction | 2026 |
| Abbasi Photography Limited | Professional & scientific | 2018 |
| Abbey Creations Ltd | Administrative & support | 2015 |
| Abbey Antique & Furnishing Ltd | Manufacturing | 1991 |
| Abbey Group Restoration Limited | Financial services | 2025 |
| Abbey Industrial Sales Co.Limited | Wholesale & retail | 1962 |
| Abbie Nail Artist Ltd | Information & communication | 2023 |
| Abbot Cleaning Care Limited | Administrative & support | 2017 |
| Abbott K9 Security Ltd | Administrative & support | 2025 |
| Abbotts Home's Ltd | Real estate | 2025 |
| ABC Gone Estates Limited | Real estate | 2022 |
| ABC Gone Ltd | Real estate | 2010 |
| ABC Venture Studio Opco Ltd | Professional & scientific | 2024 |
| Abcd Logistics Ltd | Transport & logistics | 2024 |
| ABD Gardi Ltd | Wholesale & retail | 2025 |
| Abdap Limited | Information & communication | 2022 |
| Abdul Karim & Sons Ltd | Construction | 2015 |
| Abdul Karim Investment Ltd | Real estate | 2024 |
| ABE Construct Ltd | Construction | 2025 |
| Abel Finance Limited | Financial services | 2024 |
| Abella Cafe Ltd | Hospitality | 2020 |
| Abella SUS Ltd | Health & social care | 2019 |
| Aberffraw Global Ltd | Wholesale & retail | 2025 |
| ABG Builders Ltd | Construction | 2015 |
| Abhijeet SPV Ltd | Real estate | 2023 |
| ABI Catering Limited | Hospitality | 2023 |
| Abiden C H Ltd | Health & social care | 2021 |
| Abigail Contracting Ltd | Professional & scientific | 2026 |
| Ability Recruitment Group Limited | Administrative & support | 2018 |
| Abim Services Ltd | Professional & scientific | 2026 |
| Abiqo Group Ltd | Other services | 2018 |
| Abis Care Ltd | Health & social care | 2016 |
| Abisew Logistics Limited | Transport & logistics | 2024 |
| Abitaff Limited | Professional & scientific | 2019 |
| Abjk Consultants Ltd | Information & communication | 2012 |
| ABK Builders Ltd | Construction | 2020 |
| ABL Electrical Solutions Ltd | Construction | 2024 |
| Able Emergency 24/7 Limited | Construction | 2025 |
| Able Removals Limited | Transport & logistics | 2005 |
| Able Shopfitters Ltd | Construction | 2025 |
| ABN Fire Limited | Construction | 2019 |
| ABN Integrated Services Limited | Construction | 2009 |
| ABN London Ltd | Administrative & support | 2020 |
| ABN Security Systems Limited | Construction | 2019 |
| Abna MQ Ltd | Other services | 2020 |
| Abode Mechanical Ltd | Construction | 2019 |
| About YOU Events Ltd | Professional & scientific | 2016 |
| Abpro Interior Limited | Construction | 2022 |
| ABR Jugnu Ltd | Wholesale & retail | 2025 |
| Abrss Limited | Real estate | 2024 |
| ABS Advisors Limited | Professional & scientific | 2015 |
| ABS Locksmiths Ltd | Administrative & support | 2026 |
| ABS Security Services Ltd | Administrative & support | 2022 |
| Absolutdata Ltd | Professional & scientific | 2014 |
| Absolute Carpentry Team Ltd | Construction | 2021 |
| Absolute Facades Limited | Construction | 2019 |
| Absolute Language Solutions Ltd | Professional & scientific | 2008 |
| Absolute Lofts for Homes Ltd | Construction | 2020 |
| Absolute Plates Ltd | Wholesale & retail | 2025 |
| ABW Plumbing Limited | Construction | 2010 |
| Aby's Luxe Collection Limited | Wholesale & retail | 2026 |
| Abyclau Ltd | Construction | 2026 |
| Abyssinia Ethiopian Flavours Ltd | Hospitality | 2018 |
| AC Holdings International Ltd | Financial services | 2021 |
| AC Investments International Limited | Real estate | 2020 |
| AC Steel Fabrication Ltd | Manufacturing | 2014 |
| Academic Horizon Limited | Education | 2025 |
| Academy Metals Ltd | Wholesale & retail | 2020 |
| Academy Place RTM Company Limited | Households | 2019 |
| Acaiva Group Ltd | Financial services | 2026 |
| ACC Experts Ltd | Professional & scientific | 2023 |
| ACC Tax Consultants Ltd | Professional & scientific | 2021 |
| Access Appointments Consultancy Limited | Administrative & support | 2010 |
| Access Deliveries Ltd | Transport & logistics | 2018 |
| Access Excel Solutions Limited | Information & communication | 2012 |
| ACCESS2GARDENS Ltd | Construction | 2025 |
| Acclaim Pictures Ltd | Information & communication | 2018 |
| Accord Electrical Wholesalers Limited | Wholesale & retail | 1994 |
| Accord Estates Limited | Hospitality | 2008 |
| Account and Finance Ltd | Professional & scientific | 2017 |
| Accountancy & Consultancy Limited | Professional & scientific | 1996 |
| Accountancy & Tax Crew Ltd | Professional & scientific | 2023 |
| Accountancy Bookkeeping Services Ltd | Professional & scientific | 2017 |
| Accountax Bridge Limited | Professional & scientific | 2019 |
| Accountax Group Ltd | Professional & scientific | 2018 |
| Accountax Outsourcing Ltd | Professional & scientific | 2018 |
| Accounting Enterprise Ltd | Professional & scientific | 2024 |
| Accounting Group for Hypia OIL and GAS Ltd | Wholesale & retail | 2019 |
| Accounting Services Group Limited | Administrative & support | 2019 |
| Accounting Services Task Force Ltd. | Professional & scientific | 2013 |
| Accountsbury Limited | Professional & scientific | 2024 |
| Accountsdesk Ltd | Information & communication | 2020 |
| Accountstein Ltd | Professional & scientific | 2021 |
| Accraine Ltd | Wholesale & retail | 2018 |
| Acctaxx Limited | Professional & scientific | 2016 |
| Accumulated Assets Ltd | Real estate | 2023 |
| Accunova Consulting Ltd. | Professional & scientific | 2024 |
| Accurate Accountancy Services Ltd | Professional & scientific | 2013 |
| Accurate Welding & Engineering Limited | Construction | 2004 |