| Alphaconfident International Ltd | Wholesale & retail | 2025 |
| Alpharma Limited | Wholesale & retail | 2012 |
| Alpine Glass Ltd | Construction | 2012 |
| Alpine Heating Ltd | Construction | 2016 |
| Alpine Steak HUT Ltd | Hospitality | 2024 |
| ALR Assets Limited | Health & social care | 2022 |
| ALS Financial Consultants Ltd | Professional & scientific | 2007 |
| Alsabah Limited | Health & social care | 2022 |
| Alsafa ZKM Ltd | Real estate | 2023 |
| Alshifa 5 Ltd | Professional & scientific | 2013 |
| Alspec Home Improvements Ltd | Construction | 2019 |
| Altaf Ltd | Construction | 2024 |
| Altaf Pharm Ltd | Health & social care | 2024 |
| Altaf Solicitors Ltd | Professional & scientific | 2011 |
| Altafs Properties Ltd | Real estate | 2020 |
| Altercroft Ltd | Professional & scientific | 2026 |
| Alterson Consulting Limited | Administrative & support | 2025 |
| Althabit Ltd | Administrative & support | 2024 |
| Altojosa Limited | Other services | 2015 |
| Altrys Arts Limited | Wholesale & retail | 2025 |
| Alva Healthcare Ltd | Administrative & support | 2023 |
| Alvadac Limited | Construction | 1998 |
| Alvin Gems & Jewellery Ltd | Wholesale & retail | 2023 |
| Alvis Cafe Ltd | Hospitality | 2018 |
| Alvorada Holdings Ltd | Wholesale & retail | 2026 |
| Always in Plan Ltd | Manufacturing | 2025 |
| ALX Holdings Limited | Extraterritorial | 1992 |
| Alyaan Enterprises Ltd | Transport & logistics | 2024 |
| AM & HUM Ltd | Wholesale & retail | 2024 |
| AM Busby Ltd | Real estate | 2026 |
| AM Car Salez Ltd | Wholesale & retail | 2026 |
| AM Digital Consultancy Ltd | Information & communication | 2025 |
| AM Financial Ltd | Financial services | 2018 |
| AM Group UK (Holdings) Ltd | Real estate | 2023 |
| AM Investments (Yorkshire) Limited | Administrative & support | 2013 |
| AM Joinery (U.K) Ltd | Manufacturing | 2022 |
| AM Management Estates Limited | Real estate | 2020 |
| AM Optical Limited | Health & social care | 2010 |
| AM Painting Services Ltd | Construction | 2024 |
| AM PFC Ltd | Other services | 2015 |
| AM Pharma Services Ltd | Health & social care | 2025 |
| AM Techpower Ltd | Administrative & support | 2024 |
| AMA Care Group Ltd | Financial services | 2024 |
| AMA Motor Spares Ltd | Wholesale & retail | 2025 |
| AMA Properties Yorkshire Ltd | Real estate | 2021 |
| Amaaima Couture Limited | Wholesale & retail | 2024 |
| Amaan Meat Ltd | Wholesale & retail | 2025 |
| Amaanah Enterprises Limited | Households | 2022 |
| Amaans Express Ltd | Hospitality | 2025 |
| Amaans Grill House Ltd | Hospitality | 2019 |
| Amaari Parfum Ltd | Wholesale & retail | 2019 |
| Amad Couriers Ltd | Transport & logistics | 2026 |
| Amal & Eshaal 1214 Ltd | Construction | 2023 |
| Amal Jewellers Ltd | Manufacturing | 2026 |
| Amalito Limited | Professional & scientific | 2025 |
| Aman Builders ( Yorkshire ) Limited | Construction | 2021 |
| Aman Fruit & VEG Ltd | Wholesale & retail | 2025 |
| Aman Properties Group Limited | Real estate | 2023 |
| Amana Lens Ltd | Information & communication | 2026 |
| Amanah Accountants Bradford Ltd | Professional & scientific | 2021 |
| Amanah Consulting Ltd | Professional & scientific | 2025 |
| Amanahfy Ltd | Information & communication | 2023 |
| Amani Design Studio Ltd | Professional & scientific | 2025 |
| Amani Jewellers Limited | Wholesale & retail | 2025 |
| Amani Silver Ltd | Wholesale & retail | 2025 |
| Amar Deliver Limited | Transport & logistics | 2025 |
| Amar England Limited | Arts & recreation | 2025 |
| Amar Hussain Limited | Administrative & support | 2018 |
| Amas Estates Ltd | Real estate | 2022 |
| Amaupholstery Ltd | Manufacturing | 2021 |
| Amay Associates & Co Ltd | Real estate | 2025 |
| Amaya Investments Ltd | Real estate | 2017 |
| Amayas Cafe Ltd | Hospitality | 2026 |
| Amayas Properties Ltd | Real estate | 2022 |
| Amazea Cart Ltd | Wholesale & retail | 2023 |
| Amazing Grace Empire Limited | Wholesale & retail | 2025 |
| Amazing Gyoza Ltd | Hospitality | 2024 |
| Amazzing Events UK Limited | Hospitality | 2020 |
| AMB Accounting Academy Ltd | Education | 2026 |
| Amba Training Ltd | Education | 2011 |
| Ambarella Investment Ltd | Real estate | 2015 |
| Ambassador Store Ltd | Wholesale & retail | 2024 |
| Ambassadora Global Ltd | Wholesale & retail | 2023 |
| Ambby Home Plan Limited | Other services | 2019 |
| Amber a Properties Ltd | Real estate | 2022 |
| Amber Investments (Yorkshire) Ltd | Real estate | 2019 |
| Amber Online Limited | Wholesale & retail | 2026 |
| Amberco Ltd | Manufacturing | 2020 |
| Amberlode Development Ltd | Real estate | 2026 |
| Amberlode Limited | Financial services | 2020 |
| Amberr Trading Ltd | Wholesale & retail | 2020 |
| Ambient Home Systems Limited | Construction | 2013 |
| AMC Foods (Yorks) Ltd | Wholesale & retail | 2010 |
| AMC Goods & Services Ltd | Wholesale & retail | 2023 |
| Amcomm Ltd | Information & communication | 2025 |
| AMD Metal Fabrications Ltd | Manufacturing | 2024 |
| AMD Yorkshire Limited | Real estate | 2022 |
| AME Pharma Ltd | Health & social care | 2025 |
| Amec Construction Ltd | Energy | 2023 |
| Amedi Yorkshire Ltd | Real estate | 2023 |