| A. Clarke International Limited | Transport & logistics | 2020 |
| A. Kapila Limited | Health & social care | 2011 |
| A.C. Locks Ltd | Construction | 2021 |
| A.J.F. Electrical Limited | Construction | 2003 |
| A.N.T. Welding Limited | Manufacturing | 2005 |
| A.R.D Housing Ltd | Real estate | 2019 |
| A.S.T. Design Limited | Information & communication | 2008 |
| A.T Trading Limited | Wholesale & retail | 2014 |
| A.T. Plastering & Tiling Limited | Construction | 2013 |
| A.T.B. Holdings Limited | Extraterritorial | 2016 |
| A.T.B. Systems Limited | Manufacturing | 1994 |
| A1 Traders (LYE) Limited | Hospitality | 2023 |
| AA GAS & Plumbing Limited | Construction | 2012 |
| AA GAS Solutions Ltd | Construction | 2021 |
| AA Helicopters Ltd | Transport & logistics | 2014 |
| AA Medical Ltd | Wholesale & retail | 2009 |
| AA Minibus Travels Ltd | Transport & logistics | 2014 |
| AA Security Systems Ltd | Administrative & support | 2016 |
| Aakad Ltd | Information & communication | 2022 |
| Aamiri Trading Ltd | Wholesale & retail | 2024 |
| Aaron Wilkes History Limited | Information & communication | 2016 |
| AB Racking Services Limited | Construction | 2015 |
| AB1TECH Ltd | Water & waste | 2020 |
| Abara Limited | Information & communication | 2026 |
| Abbey Gardens Ludlow Management Company Limited | Households | 2004 |
| Abbeyfields Consulting Limited | Real estate | 2020 |
| Abby Eaton Limited | Wholesale & retail | 2021 |
| ABC Lucas Limited | Wholesale & retail | 2021 |
| ABC Plumbing, Heating & GAS Services Limited | Construction | 2004 |
| ABE Foods Trading Limited | Hospitality | 2026 |
| ABE Holdings Limited | Financial services | 2026 |
| Abijax Labradors Ltd | Agriculture & fishing | 2021 |
| Abika Property Group Limited | Hospitality | 2025 |
| ABM Taxis Ltd | Transport & logistics | 2021 |
| Above Average Properties Limited | Real estate | 2015 |
| ABS Business Services Limited | Professional & scientific | 2002 |
| Abstract Carpets Limited | Wholesale & retail | 2010 |
| Abundance Property Holdings Ltd | Professional & scientific | 2024 |
| ABW Communications Ltd | Professional & scientific | 2024 |
| AC Engineering Services (Midlands) Ltd | Professional & scientific | 2025 |
| Academic Choice Limited | Administrative & support | 2009 |
| Accountancy With LSB Ltd | Professional & scientific | 2025 |
| Accreditation Society Limited | Education | 2008 |
| Acorn Polish and Floor Repairs Ltd | Construction | 2018 |
| Acorn Support Limited | Administrative & support | 2009 |
| Acorn Travel Group Ltd | Administrative & support | 2011 |
| Acorn Venture Holdings Limited | Administrative & support | 2011 |
| Acquis Media Limited | Arts & recreation | 2004 |
| Acre Farm Park Limited | Hospitality | 1979 |
| ACT Associates Limited | Information & communication | 1991 |
| Action Grandad Limited | Extraterritorial | 2023 |
| Active Adventurers Ltd | Arts & recreation | 2015 |
| Active Car Wash Supplies Ltd | Wholesale & retail | 2013 |
| ACTIVE24/7 Ltd | Wholesale & retail | 2024 |
| Actualise Learning Ltd | Professional & scientific | 2011 |
| ADA & EMA LEO Beam Limited | Water & waste | 2025 |
| ADA Builders Ltd | Construction | 2018 |
| Adam Lippitt Trading Organisation Ltd | Wholesale & retail | 2014 |
| Adam's Style Barbers Ltd | Other services | 2017 |
| Adams & ING Limited | Real estate | 2021 |
| Adams Barber Club Ltd | Other services | 2024 |
| Adams Barber Room Ltd | Other services | 2026 |
| Adan Naheem Ltd | Construction | 2025 |
| Adapt Properties Ltd | Construction | 2019 |
| Adaptiv Risk Management Ltd | Professional & scientific | 2026 |
| Added Value Consultants Limited | Professional & scientific | 2013 |
| Addison Saws Limited | Wholesale & retail | 2000 |
| Admin Ninjas Ltd | Administrative & support | 2022 |
| Admiral Designs Limited | Manufacturing | 2012 |
| Adms Agencies Ltd | Wholesale & retail | 2023 |
| Adom (Properties) Limited | Real estate | 2021 |
| Advance Tool Hire Limited | Manufacturing | 1980 |
| Advanced Composite Machining Limited | Manufacturing | 2014 |
| Advanced Organics West Midlands Ltd | Agriculture & fishing | 2023 |
| Advanced Vehicle Security Ltd | Administrative & support | 2020 |
| Advent Mcvalley Limited | Construction | 2021 |
| Adventure Caravans Limited | Wholesale & retail | 2007 |
| Adventure Quest (Great Bridge) Ltd | Administrative & support | 2017 |
| Advocacy Services Limited | Professional & scientific | 2004 |
| ADY CON Way Limited | Construction | 2025 |
| Aequalis Living Ltd | Real estate | 2024 |
| Aequalis Property Group Ltd. | Financial services | 2024 |
| Aequalis Property Investments Ltd | Real estate | 2024 |
| Aero Sales Solutions Ltd | Professional & scientific | 2020 |
| Aerosurv Ltd | Professional & scientific | 2023 |
| Aesthetic Balance Ltd | Health & social care | 2024 |
| AEV Property Limited | Real estate | 2026 |
| Aeviternityshore Ltd | Wholesale & retail | 2023 |
| AEX Finance Limited | Professional & scientific | 2024 |
| AFD Logistics Limited | Transport & logistics | 2006 |
| Afterglow Cleaning Solutions Ltd | Administrative & support | 2026 |
| AG Travel Escapes Ltd | Administrative & support | 2026 |
| AGE Concern Stourbridge and Halesowen | Health & social care | 1996 |
| Agile Quality Solutions Ltd | Information & communication | 2021 |
| AGK Education Consultancy Ltd | Education | 2026 |
| AGM Agencies (Midlands) Ltd | Wholesale & retail | 2003 |
| Agmtaj News PVT Limited | Wholesale & retail | 2025 |
| Agreavespa Ltd | Health & social care | 2022 |
| Agrm Ltd | Transport & logistics | 2023 |
| Agrs Trading Limited | Wholesale & retail | 2026 |