| 10 Minute Holiday Ltd | Other services | 2025 |
| 155 at the Courtyard Ltd | Hospitality | 2015 |
| 1ST Able Building & Maintenance Limited | Construction | 1997 |
| 3A Strategies Limited | Administrative & support | 2016 |
| 3DBYW Ltd | Manufacturing | 2025 |
| 3P Construct Limited | Construction | 2024 |
| 5HAW Limited | Administrative & support | 2014 |
| 7K Automotive Ltd | Wholesale & retail | 2024 |
| A & K Mexborough Limited | Wholesale & retail | 2013 |
| A Catlow Complete Utilities Ltd | Construction | 2023 |
| A Cooper Brickwork Ltd | Manufacturing | 2019 |
| A Lynch Designs Ltd | Construction | 2025 |
| A Parsons Interiors Ltd | Construction | 2015 |
| A&K Corporation Ltd | Financial services | 2025 |
| A-Star (Mexborough) Barber Ltd | Other services | 2022 |
| A. C. Paintech Ltd | Manufacturing | 2007 |
| A.M.B. Products Limited | Extraterritorial | 1959 |
| A1 Joinery & SON Limited | Construction | 2003 |
| AAZ Holdings Limited | Extraterritorial | 2021 |
| Abbey Estates (Yorkshire) Limited | Extraterritorial | 2011 |
| Abbey Veterinary Group Limited | Professional & scientific | 2011 |
| Abbey Veterinary Sales Limited | Professional & scientific | 2011 |
| ABE Building Services Ltd | Construction | 2024 |
| Able Construction and Maintenance Limited | Construction | 2023 |
| Above Security Limited | Administrative & support | 2026 |
| Accounting Angels Limited | Professional & scientific | 2000 |
| ACD Holdings Limited | Professional & scientific | 2017 |
| Acgas Holdings Ltd | Financial services | 2025 |
| Acgas Holiday Lettings Ltd | Real estate | 2025 |
| Acgas Residential Lettings Ltd | Real estate | 2025 |
| Acorn (Yorkshire) Limited | Administrative & support | 2008 |
| Acteuro Limited | Manufacturing | 2012 |
| Acute Property and Finance Solutions Ltd | Administrative & support | 2019 |
| Adam Homecare Designs Limited | Construction | 1995 |
| Adam Oates Joinery Limited | Construction | 2015 |
| ADE Investments Ltd | Professional & scientific | 2024 |
| Adfab Engineering Limited | Manufacturing | 1996 |
| Adhiti Group Ltd | Hospitality | 2026 |
| Advanced Roofing & Construction Ltd | Construction | 2025 |
| AEB Logistics Limited | Transport & logistics | 2025 |
| Aegeus Energy Solutions Limited | Wholesale & retail | 2015 |
| AES Training and Consultancy Limited | Professional & scientific | 2022 |
| Aftar Limited | Real estate | 2025 |
| AG Transport (SY) Ltd | Transport & logistics | 2020 |
| Agache Logistics Limited | Transport & logistics | 2023 |
| Agmj Property Maintenance Limited | Construction | 2025 |
| Agnessia Decorating Ltd | Construction | 2020 |
| AHM Labs Ltd | Information & communication | 2025 |
| AIA Real Estate Ltd | Real estate | 2025 |
| Aimee Willow Connex Limited | Administrative & support | 2015 |
| Aircheck Services Limited | Health & social care | 2004 |
| AJ Lock and Key Ltd | Wholesale & retail | 2024 |
| Ajak Energy Ltd | Transport & logistics | 2023 |
| AJB Apex Renovations Ltd | Construction | 2026 |
| AJD3 Ltd | Wholesale & retail | 2022 |
| Akvilla Ltd | Construction | 2024 |
| Alder Tree Catering Ltd | Hospitality | 2019 |
| ALI Hass Ltd | Wholesale & retail | 2025 |
| ALL Children Great and Small Ltd | Education | 2019 |
| ALL Paws Limited | Administrative & support | 2008 |
| Alltherm Insulations Limited | Construction | 2010 |
| Alpha Technical Ltd | Extraterritorial | 2009 |
| ALS Building Contractors Limited | Construction | 2018 |
| ALS Homes Limited | Construction | 2014 |
| Alternative Cycle Limited | Administrative & support | 2009 |
| Amazing Four Ltd | Hospitality | 2023 |
| AMF Fragrance Ltd | Wholesale & retail | 2019 |
| AMM Gardening Services Limited | Administrative & support | 2024 |
| Amsl Properties Limited | Construction | 1992 |
| AMW Restorations Limited | Manufacturing | 2017 |
| Andar Limited | Real estate | 2021 |
| Andrew Holgate (Consulting) Limited | Professional & scientific | 2009 |
| Andrew's Butchery Limited | Wholesale & retail | 2012 |
| Andy Hall Mortgages Ltd | Financial services | 2015 |
| Angela Yardy Ltd | Information & communication | 2023 |
| Angk Food Ltd | Hospitality | 2018 |
| Anmi Trans Ltd | Transport & logistics | 2023 |
| Anorth Ltd | Transport & logistics | 2025 |
| Antika Stone Limited | Wholesale & retail | 2023 |
| Apollo Safety Ltd | Professional & scientific | 2022 |
| Approved G.U.Y.S. Ltd | Transport & logistics | 2022 |
| Aprh Hospitality LLP | | 2020 |
| ARC Electrical & Property Maintenance Ltd | Construction | 2022 |
| Arcc Services Limited | Professional & scientific | 2024 |
| ARG (Nationwide) Limited | Professional & scientific | 2015 |
| ARH Machinery Ltd | Administrative & support | 2022 |
| Arora Foods PVT Ltd | Hospitality | 2025 |
| Arranmore Park Rest Home Ltd | Health & social care | 2020 |
| Arrow Signs Limited | Other services | 2003 |
| Arthur Caddick Electrical Contractors Limited | Construction | 1999 |
| Artisan Flowers Limited | Wholesale & retail | 2022 |
| Artistic Spectrum Limited | Arts & recreation | 2013 |
| ARW Plastering Projects Ltd | Construction | 2023 |
| AS Pizza Ltd | Hospitality | 2022 |
| Ashley House Furniture Ltd | Wholesale & retail | 2023 |
| Askew Property Group Limited | Real estate | 2020 |
| ASM RCN Healthcare Limited | Health & social care | 2025 |
| Assess to Support Limited | Public administration | 2022 |
| Association of Subcontractors Ltd | Other services | 2021 |
| Assurance Through Certification (ATC) Limited | Professional & scientific | 2021 |