| AES Electrical Contractors Limited | Construction | 1999 |
| African and Caribbean Black Welfare Solutions Limited | Administrative & support | 2022 |
| Agency Drivers Lancashire Ltd | Administrative & support | 2007 |
| Agrimac Exports Ltd | Manufacturing | 2014 |
| AHM (North West) Limited | Health & social care | 2003 |
| Ahmed Investments Limited | Real estate | 2001 |
| Ainsworth and Parkinson Limited | Information & communication | 2005 |
| Ainsworths Limited | Professional & scientific | 2004 |
| AIP Painting & Decorating Contractors Limited | Construction | 2007 |
| Aircelle Pension Scheme Trustees Limited | Professional & scientific | 1989 |
| Aitch Tools & Fastners Ltd | Manufacturing | 2006 |
| AJP Engineering Limited | Manufacturing | 2002 |
| Akshar Estates Ltd | Real estate | 2023 |
| Al-Amin Cash & Carry Limited | Wholesale & retail | 2003 |
| Al-Fayyaz Limited | Hospitality | 2002 |
| Aladdin (Accrington) Limited | | 1986 |
| Alan Cottam Agency Limited | Arts & recreation | 2007 |
| Albany International Limited | Manufacturing | 1907 |
| Albion Properties (Bolton) Limited | Real estate | 1989 |
| ALD Business Services Ltd | Professional & scientific | 2007 |
| Alderson and Horan Funeral Services Limited | Administrative & support | 2006 |
| Aldred Limited | Professional & scientific | 2004 |
| Alex Phillips Printing Services Limited | Manufacturing | 2002 |
| Alfaprint (Liverpool) Limited | Transport & logistics | 1985 |
| Alian Energy Solutions Limited | Construction | 2007 |
| Alistair Clarke Media Limited | Administrative & support | 2006 |
| Alistair Hillaby Triumph Motorcycle Specialist Limited | Wholesale & retail | 1997 |
| Alkas Services Ltd | Construction | 2025 |
| Alkron Industrial Limited | Professional & scientific | 1995 |
| Alkron Properties Limited | Real estate | 1996 |
| ALL in One Carers Ltd | Health & social care | 2022 |
| ALL Specs Opticians Ltd. | Health & social care | 1997 |
| Allenby Road Garage Limited | Wholesale & retail | 2007 |
| Alliance Builders & Plumbers Limited | Administrative & support | 2006 |
| Allspares (Wigan) Limited | Wholesale & retail | 1985 |
| Alness Lodge Limited | Health & social care | 2003 |
| Alpe's the Butcher Limited | Wholesale & retail | 2003 |
| Alpha Electrical & Network Services Limited | Construction | 2006 |
| Alphabet Arts Ltd | Arts & recreation | 2005 |
| Altowise Limited | Real estate | 1986 |
| Alvic Construction Limited | Real estate | 1999 |
| Alwyn Brunnel Ltd | Wholesale & retail | 2025 |
| Alwyn's Autocare (Chorley) Limited | Wholesale & retail | 2005 |
| AM Properties (Hyndburn) Limited | Real estate | 2002 |
| Amalgamated Property Investments Ltd | Real estate | 1998 |
| Amay Properties Limited | Real estate | 1981 |
| Ambrose Activity Limited | Administrative & support | 2007 |
| AMC Brothers Ltd | Wholesale & retail | 2022 |
| AMD Properties Limited | Real estate | 2002 |
| Amelhill Limited | Professional & scientific | 2000 |
| Ameriamk Ltd | Professional & scientific | 2019 |
| Amethyst Marketing (U.K.) Limited | Information & communication | 1993 |
| Amplify Hearing Ltd | Wholesale & retail | 2016 |
| AND Thinking Limited | Professional & scientific | 2002 |
| Andele's Cafe Ltd | Hospitality | 2026 |
| Anderson Electrical Installations Limited | Construction | 2007 |
| Andivo Limited | Real estate | 1999 |
| Andrac Land & Property (UK) Limited | Real estate | 2007 |
| Andrew Haig Limited | Administrative & support | 2005 |
| Andy.Ndt Services Ltd | Professional & scientific | 2009 |
| Angel Training Systems Ltd | Education | 2006 |
| Annwen Investments Limited | Real estate | 2005 |
| Answershore Limited | Administrative & support | 2003 |
| Antenn-I Creative Limited | Professional & scientific | 2006 |
| Anthony Shipley Building Consultancy (Asbc) Ltd. | Professional & scientific | 2005 |
| Antony Price Limited | Agriculture & fishing | 2003 |
| Anwar & Company Ltd | Wholesale & retail | 2002 |
| Apeks Marine Equipment Limited | Manufacturing | 1975 |
| Appleton Deeley Limited | Professional & scientific | 2005 |
| Applied (UK) Ltd | Construction | 2002 |
| Aqua DI ORO Ltd | Wholesale & retail | 2025 |
| Arbour Safety Management Ltd | Professional & scientific | 2005 |
| Architectural & Technical Design Limited | Professional & scientific | 1989 |
| Arcmedia Limited | Administrative & support | 2005 |
| Arena Associates Ltd | Administrative & support | 2009 |
| Aresky OIL and GAS Ltd | Other services | 2021 |
| Argyle Engineering Services Limited | Manufacturing | 2003 |
| Argyle Street Joinery Limited | Manufacturing | 2003 |
| Ariom Solutions Limited | Professional & scientific | 2001 |
| ARK Construction (North West) Limited | Construction | 2002 |
| Armacell UK Limited | Manufacturing | 1999 |
| Armitage Financial Advisers Limited | Financial services | 2005 |
| Armstrongs Bakers Limited | Manufacturing | 2008 |
| Arnold Riley and SON Limited | | 1961 |
| Arnside House Ltd | Wholesale & retail | 2003 |
| Artchain Ltd | Information & communication | 2018 |
| Arteria Limited | Wholesale & retail | 2004 |
| Arvacian Limited | Real estate | 2007 |
| ASC Electrical Services Limited | Construction | 2002 |
| Ashedge Limited | Real estate | 1991 |
| Ashfield Mill Co Limited | Financial services | 2008 |
| Ashford Rainham Limited | Professional & scientific | 2002 |
| Ashlea Landscaping Limited | Extraterritorial | 1982 |
| Ashlea Limited | Construction | 2000 |
| Ashton Mortgage & Financial Solutions Limited | Financial services | 2004 |
| Ashton Office Supplies Limited | Wholesale & retail | 1987 |
| Ashway Properties Ltd | Extraterritorial | 2000 |
| Ashworth Treasure (BOC) Limited | Professional & scientific | 2002 |
| Ashworth Treasure Limited | Professional & scientific | 2003 |
| Asistobe Ltd | Administrative & support | 2007 |