| Aryan Advisory Ltd | Information & communication | 2025 |
| Aryan Stores Ecclesfield Ltd | Wholesale & retail | 2025 |
| Aryanetix Ltd | Information & communication | 2018 |
| Arzhad Ltd | Real estate | 2010 |
| Arzoo KBS Ltd | Hospitality | 2017 |
| AS & Co. Properties Ltd | Real estate | 2025 |
| AS 628 Limited | Hospitality | 2026 |
| AS Larry Ltd | Professional & scientific | 2016 |
| AS Millhouses Ltd | Professional & scientific | 2011 |
| AS Music School LLP | | 2012 |
| ASA Delicia Limited | Manufacturing | 2025 |
| Asaak Ltd | Administrative & support | 2020 |
| Asaaz Ltd | Wholesale & retail | 2017 |
| Asad Karim Group Ltd | Professional & scientific | 2021 |
| Asad Medical Services Limited | Health & social care | 2021 |
| Asali Desserts Ltd | Hospitality | 2025 |
| Asante Direct Limited | Transport & logistics | 2008 |
| Asap Digital Limited | Manufacturing | 2005 |
| Asapsworth Ltd | Real estate | 2023 |
| ASB Family Investment Co Ltd | Real estate | 2024 |
| ASB Play Centre Limited | Arts & recreation | 2022 |
| Asbestos Abatement UK Ltd | Water & waste | 2019 |
| Asbestos Claims Lawyers Limited | Professional & scientific | 2016 |
| Asbiro Investors Ltd | Education | 2018 |
| Asbv Limited | Real estate | 2025 |
| ASC Contractors Ltd | Water & waste | 2018 |
| ASC Contracts Ltd | Water & waste | 2009 |
| ASC Electrical Projects Limited | Construction | 2011 |
| ASC Ices Limited | Hospitality | 2013 |
| ASC Property Management Services Ltd | Real estate | 2016 |
| Ascend Architecture Ltd | Professional & scientific | 2022 |
| Ascend Digital Ltd | Information & communication | 2022 |
| Ascendia Ventures Ltd | Information & communication | 2023 |
| Ascendien Ltd | Wholesale & retail | 2024 |
| Ascension Sales & Hire Limited | Wholesale & retail | 2021 |
| Ascension Scaffolding Property Investment Ltd | Financial services | 2021 |
| Ascent Homes Limited | Real estate | 2019 |
| Ascent Legal Services Limited | Professional & scientific | 2004 |
| Ascent Leisure Company Ltd | Hospitality | 2025 |
| Ascent Leisure Group Ltd | Hospitality | 2025 |
| Ascent Lifts Limited | Manufacturing | 2015 |
| Ascentel Limited | Financial services | 2021 |
| Ascentry Ltd | Professional & scientific | 2021 |
| Ascot Roofing & Building Services Ltd | Construction | 2021 |
| Ascure Nova Limited | Wholesale & retail | 2019 |
| ASD 32 Limited | Financial services | 2017 |
| ASD Law Limited | Financial services | 2017 |
| ASD Real Estate Ltd | Administrative & support | 2015 |
| Aseiro Industries Ltd | Manufacturing | 2025 |
| Aset (1982) Limited | Education | 1982 |
| ASF Accounting Services Limited | Professional & scientific | 2020 |
| ASF16 Limited | Transport & logistics | 2019 |
| ASG Bulk Haulage Ltd | Transport & logistics | 2011 |
| ASG Consulting (Sheffield) Ltd | Administrative & support | 2020 |
| ASG Highways Ltd | Construction | 2023 |
| Asgard Group Ltd | Professional & scientific | 2006 |
| Asghar Asset Management Ltd | Real estate | 2025 |
| Asgq Holdings Ltd | Real estate | 2025 |
| ASH & Partner Property Ltd | Real estate | 2025 |
| ASH (SY) Limited | Wholesale & retail | 2015 |
| ASH Avionics Ltd | Professional & scientific | 2026 |
| ASH Commmercial and Residential Limited | Real estate | 2017 |
| ASH Networks Limited | Information & communication | 2018 |
| ASH Pubs Ltd | Hospitality | 2025 |
| ASH Refractories Limited | Other services | 2015 |
| ASH Tree Properties Limited | Real estate | 2014 |
| ASH3 Limited | Wholesale & retail | 2025 |
| Ashantigraham Medical Company Limited | Health & social care | 2025 |
| Ashay Dance CIC | Arts & recreation | 2023 |
| Ashbee Properties Limited | Real estate | 2021 |
| Ashberry Group Ltd. | Real estate | 2024 |
| Ashbourne Self Catering Limited | Hospitality | 2016 |
| Ashbrook Garage Services Limited | Wholesale & retail | 2008 |
| Ashbrook Vehicle Hire Ltd | Administrative & support | 2013 |
| Ashbrooke House Nursing Home Limited | Education | 1999 |
| Ashcor Tarmacadam Limited | Construction | 2016 |
| Ashcroft Couriers Ltd | Transport & logistics | 2025 |
| Ashcroft Land & Property Ltd | Real estate | 2026 |
| Ashdale North West Limited | Extraterritorial | 2008 |
| Ashe Logic Ltd | Wholesale & retail | 2025 |
| Ashel Optics Ltd | Health & social care | 2026 |
| Ashen ODE Creations Limited | Information & communication | 2025 |
| Asher Global Limited | Information & communication | 2024 |
| Ashfan Limited | Wholesale & retail | 2025 |
| Ashfar & SON Limited | Hospitality | 2023 |
| Ashfield Court Limited | Real estate | 2010 |
| Ashfield Groundworks Ltd | Construction | 2023 |
| Ashfield Hypnotherapy Ltd | Other services | 2023 |
| Ashford Advisory Limited | Professional & scientific | 2023 |
| Ashford Property Holdings Limited | Real estate | 2017 |
| Ashgate - MO Ltd | Hospitality | 2020 |
| Ashgate Building Services Limited | Construction | 2021 |
| Ashgate Property Developments Limited | Construction | 2003 |
| Ashgate Road Limited | Financial services | 2018 |
| Ashgrove Consultants Limited | Professional & scientific | 2024 |
| Ashhuby Taxi Services Ltd | Transport & logistics | 2026 |
| Ashiana Sheffield | Hospitality | 2006 |
| Ashland Court Maintenance RTM Company Limited | Households | 2007 |
| Ashland Estates Limited | Construction | 2019 |
| Ashlea Property Limited | Real estate | 2020 |