| AM Kelsey Limited | Construction | 2003 |
| AM Paint and Bodyshop Supplies Ltd | Wholesale & retail | 2024 |
| Am&Bs Limited | Professional & scientific | 2013 |
| AM2PM Properties Ltd | Real estate | 2023 |
| Amad Barber 2026 Ltd | Other services | 2026 |
| Amanuensis Limited | Construction | 1959 |
| Amanzi Spa Limited | Professional & scientific | 2021 |
| Amarella Ltd | Professional & scientific | 2016 |
| Amari Bidco Limited | Information & communication | 2025 |
| Amari Group Limited | Information & communication | 2018 |
| Amari Holdco Limited | Information & communication | 2025 |
| Amari Midco Limited | Information & communication | 2025 |
| Amari Nomineeco Limited | Professional & scientific | 2026 |
| Amarsys Limited | Information & communication | 2001 |
| Amatra Ltd | Information & communication | 2024 |
| AMB Composite Solutions Ltd | Manufacturing | 2025 |
| AMB Garden Maintenance Limited | Administrative & support | 2022 |
| Ambassador Hotel | | 1992 |
| Amber Media Limited | Information & communication | 2018 |
| Amber Productions Limited | Information & communication | 2018 |
| Amberstride Limited | Professional & scientific | 2011 |
| Amberwood (Carlisle) Management Company Limited | Households | 2018 |
| Ambiente Tapas Limited | Hospitality | 2007 |
| Ambiente Tapas Trustees Limited | Hospitality | 2024 |
| Ambleside Homes (Galtres) Limited | Construction | 2017 |
| Ambleside Homes (Sparrow 2025) Ltd | Construction | 2025 |
| Ambleside Homes Limited | Construction | 2014 |
| Ambleside Limited | Construction | 1998 |
| Ambleside Residential Developments Limited | Construction | 2009 |
| Ambrose Street (Management Company) Limited | Households | 2008 |
| Ambush Reality Limited | Arts & recreation | 2006 |
| Ambush Reality Records Limited | Information & communication | 2022 |
| Ambush Reality Services LLP | | 2026 |
| Ambzdt Entertainment Limited | Information & communication | 2018 |
| Amcc Yorkshire Limited | Professional & scientific | 2018 |
| Amco Cctv Ltd. | Administrative & support | 2013 |
| Amco Security Limited | Administrative & support | 1995 |
| Amco Services (Europe) Limited | Administrative & support | 2000 |
| AMCO999 Limited | Administrative & support | 2013 |
| AME Homes Ltd | Construction | 2022 |
| Ameliamindwellness Ltd | Health & social care | 2025 |
| Ameqs Cleaning Services Ltd | Administrative & support | 2026 |
| Amethyst Living Limited | Real estate | 2025 |
| AMG Investco Limited | Real estate | 2024 |
| Amgis Ltd | Professional & scientific | 2020 |
| Amhp Solutions Ltd | Health & social care | 2023 |
| Amijosh Ltd | Health & social care | 2015 |
| AMJ Automotive Ltd | Wholesale & retail | 2026 |
| AMJ Detailing Ltd | Wholesale & retail | 2024 |
| Amnc Ltd | Health & social care | 2023 |
| Amora Studios Ltd | Real estate | 2026 |
| AMP (York) Limited | Transport & logistics | 2016 |
| AMP Global Group Ltd | Financial services | 2021 |
| AMP Music Yorkshire | Arts & recreation | 2009 |
| AMP Procurement Ltd | Administrative & support | 2016 |
| Ampaintworx Ltd | Wholesale & retail | 2024 |
| Amphitryon Leisure Ltd | Hospitality | 2018 |
| Ampleforth Abbey Trading Limited | Agriculture & fishing | 1952 |
| Ampleforth College Enterprises Limited | Real estate | 2024 |
| Ampliphi Ltd | Professional & scientific | 2023 |
| AMR Planning Services Ltd | Professional & scientific | 2024 |
| AMS Heating Limited | Construction | 2013 |
| AMS Medical Ltd | Health & social care | 2020 |
| AMY Jordison Photography Ltd | Professional & scientific | 2021 |
| Amygdale Ltd | Professional & scientific | 2020 |
| Amyork Ltd | Administrative & support | 2023 |
| AN Acre of Land Ltd | Wholesale & retail | 2025 |
| Anada Spa & Wellness Ltd | Administrative & support | 2024 |
| Anakwe Ltd | Information & communication | 2024 |
| Anamamour Limited | Wholesale & retail | 2026 |
| ANB International Orthodontics Ltd | Health & social care | 2025 |
| Anchor FTV Limited | Professional & scientific | 2023 |
| Anchorage Hire Services Ltd | Administrative & support | 2025 |
| Anchorpoint Consulting Ltd | Professional & scientific | 2024 |
| AND Drink Co. Ltd | Wholesale & retail | 2026 |
| Andante Group Limited | Administrative & support | 2020 |
| Anderson (York) Ltd | Construction | 2006 |
| Anderson Abercromby Veterinary Referrals Limited | Extraterritorial | 2011 |
| Anderson Grain Marketing Limited | Agriculture & fishing | 2003 |
| Anderson Minibus Hire Ltd | Transport & logistics | 2025 |
| Anderson Periodontics Ltd | Health & social care | 2023 |
| Anderson Plumbing & Heating Limited | | 2001 |
| Anderson Pollak Legal Ltd | Professional & scientific | 2026 |
| Andjus Ltd | Real estate | 2025 |
| Andrea Beckett Interiors Ltd | Other services | 2006 |
| Andrea Ubhi Limited | Health & social care | 2014 |
| Andrew Beatson Plumbing and Heating Limited | Construction | 2016 |
| Andrew Brind Ltd | Manufacturing | 2014 |
| Andrew Brown Cars T/A Andrew Brown Caravans Ltd | Wholesale & retail | 2020 |
| Andrew Clayton Enterprises Ltd | Information & communication | 2018 |
| Andrew G Podmore & SON Limited | Other services | 2013 |
| Andrew Henderson PMO Ltd | Professional & scientific | 2026 |
| Andrew Osguthorpe Builder Ltd | Construction | 2015 |
| Andrew Ramsden Tiling Limited | Construction | 2016 |
| Andrew Richardson Transport Limited | Transport & logistics | 2014 |
| Andrews Associates (UK) Ltd | Professional & scientific | 2008 |
| Andrews Signs & Engravers Limited | Manufacturing | 2008 |
| Andy Dodsworth Electrical Limited | Construction | 2016 |
| Andy Falconer Consultancy Ltd | Professional & scientific | 2025 |
| Andy Gaines Photography Limited | Professional & scientific | 2015 |