| A.S.A.P. Recovery Limited | Water & waste | 1998 |
| A1 Complete Security Ltd | Manufacturing | 2009 |
| A2B Retail UK Ltd | Wholesale & retail | 2022 |
| A2Z Wealth Management Limited | Professional & scientific | 2023 |
| AA GAS Engineer Limited | Construction | 2020 |
| AA Property Ltd | Real estate | 2023 |
| AAC Developments (Midlands) Ltd | Real estate | 2024 |
| AAD Real Estate Ltd | Real estate | 2020 |
| AAI Aziz Holdings Ltd | Real estate | 2021 |
| Aambers Groundworks Limited | Construction | 2025 |
| AAN Barbers Ltd | Other services | 2025 |
| Aaria Travels Ltd | Transport & logistics | 2024 |
| AB Consultancy Limited | Administrative & support | 2005 |
| Abacus IT Services Limited | Information & communication | 2015 |
| Abacus Wealth Limited | Professional & scientific | 2011 |
| Abbey Group Investments Ltd | Financial services | 2025 |
| Abbey Road Traditional Butchers 2020 Ltd | Manufacturing | 2020 |
| Abbotsgate Limited | Professional & scientific | 2014 |
| Abbotts Security Ltd | Administrative & support | 2022 |
| ABC123CAPSLTD Ltd | Wholesale & retail | 2025 |
| Abdul Manan Khan Ltd | Wholesale & retail | 2025 |
| Abedrive Ltd | Transport & logistics | 2022 |
| Abel Civils Ltd | Construction | 2025 |
| Aberdeen Mobility Transport Limited | Transport & logistics | 2024 |
| Abeyance Media Ltd | Information & communication | 2023 |
| Abhnerolzy Ltd | Transport & logistics | 2023 |
| Abode Security Ltd | Administrative & support | 2025 |
| Abreej Accessories Ltd | Wholesale & retail | 2025 |
| Absolute Company Services Ltd | Wholesale & retail | 2015 |
| ABU Dhabi Ltd | Transport & logistics | 2022 |
| Abyss Talent Solutions Ltd | Administrative & support | 2024 |
| ABZ Capital Limited | Hospitality | 2019 |
| Abzi Audio Engineering Ltd | Manufacturing | 2025 |
| Abzi Travel Services Limited | Transport & logistics | 2026 |
| AC Fast Transport Ltd | Transport & logistics | 2023 |
| Academici Limited | Information & communication | 2005 |
| Acar Holdings Limited | Real estate | 2025 |
| Access Industrial Doors (Midlands) Limited | Construction | 1998 |
| Access Industrial Doors Limited | Extraterritorial | 2005 |
| Accords Transports Ltd | Transport & logistics | 2016 |
| Accountancy & Book-Keeping Services (Midlands) Ltd | Professional & scientific | 2018 |
| Accugrind Ltd | Manufacturing | 2017 |
| Accumill Ltd | Professional & scientific | 2010 |
| Acda Logistics Ltd | Transport & logistics | 2026 |
| Ace Fabrications (WM) Ltd | Manufacturing | 2017 |
| Ace Sections Limited | Manufacturing | 2003 |
| Ace Storage Place Limited | Real estate | 2018 |
| Ace Travel Midlands Ltd | Administrative & support | 2023 |
| Acer Environmental Limited | Professional & scientific | 2017 |
| Acer Holdings and Investments Ltd | Financial services | 2024 |
| Achievement Recruitment Ltd | Administrative & support | 2026 |
| ACJ Construction (Sedgley) Ltd | Construction | 2016 |
| Ackleton Meadows Management Company Limited | Households | 2024 |
| ACL Auto Repairs Limited | Wholesale & retail | 2018 |
| ACL MOT & Repairs Ltd | Wholesale & retail | 2022 |
| Acme Computing Limited | Information & communication | 2011 |
| Acocks Property Management Limited | Households | 1993 |
| Acotis Jewellery Limited | Wholesale & retail | 2025 |
| Acousta Foam Limited | Manufacturing | 1980 |
| Acoustafoam Holdings Limited | Real estate | 2024 |
| Acqi Group Limited | Wholesale & retail | 2025 |
| Acquire Plus Limited | Information & communication | 2018 |
| Acro Roofing Ltd | Construction | 2018 |
| ACS Distance Education Limited | Education | 2002 |
| Action Heart (Trading) Limited | Health & social care | 1990 |
| Active Business Accountants Ltd | Administrative & support | 2008 |
| Active Business Consultants Limited | Professional & scientific | 1991 |
| Active Business Ltd | Professional & scientific | 2015 |
| Activities and Wellbeing Limited | Health & social care | 2022 |
| Actov Change CIC | Education | 2015 |
| AD Dance Ltd | Arts & recreation | 2018 |
| AD Dance Media Ltd | Arts & recreation | 2021 |
| AD Metalwork Solutions Ltd | Manufacturing | 2016 |
| ADA RAE Limited | Wholesale & retail | 2025 |
| Adam Flavell Ltd | Hospitality | 2026 |
| Adams Close Ltd | Real estate | 2016 |
| Adays Multi Services Company Ltd | Other services | 2024 |
| ADB Builders Limited | Construction | 2003 |
| Adcom Limited | Real estate | 2025 |
| Adcom Supported Living Services CIC | Real estate | 2025 |
| ADD Item to Ltd | Professional & scientific | 2025 |
| ADD Marketing Ltd | Professional & scientific | 2021 |
| Addheat Midlands Limited | Wholesale & retail | 2015 |
| Additional Community Medical Services Ltd | Health & social care | 2010 |
| ADE Design & Build Ltd | Construction | 2026 |
| Adek Logistics Limited | Transport & logistics | 2025 |
| Adelin Milos Ltd | Transport & logistics | 2025 |
| ADF Construction Limited | Construction | 2020 |
| ADG Brickwork Contractors Limited | Professional & scientific | 2016 |
| ADG Homes Ltd | Real estate | 2019 |
| Adivas Logistics Ltd | Transport & logistics | 2018 |
| Adivin Ltd | Hospitality | 2025 |
| Adkins Enterprises Limited | Information & communication | 2021 |
| ADM Commercial Services Limited | Professional & scientific | 2026 |
| Admax Corporate Homes Ltd | Administrative & support | 2019 |
| Admax Corporate Limited | Health & social care | 2016 |
| Adrian Albac Transport Limited | Transport & logistics | 2015 |
| Adrian Logistic Group Ltd | Transport & logistics | 2018 |
| Adrian Love Hair Artistry Ltd | Other services | 2025 |
| Adron Properties Limited | Real estate | 2025 |