| APM Property Development Ltd | Real estate | 2023 |
| APN Group Managed Services Limited | Administrative & support | 2023 |
| APN Group Specialist Collections Limited | Administrative & support | 2024 |
| Apna Dera Oldham Limited | Hospitality | 2023 |
| Apna Ghar Limited | Real estate | 2025 |
| Apollo Care Solutions Ltd | Health & social care | 2025 |
| Apparel Design Studio Limited | Administrative & support | 2012 |
| Apple Tree Decor Ltd | Arts & recreation | 2018 |
| Apple Tree Trading Ltd | Transport & logistics | 2019 |
| Apple Tyres Ltd | Wholesale & retail | 2012 |
| Applebys Business Centre Limited | Real estate | 1998 |
| Appledore Nursery Moorside Ltd | Education | 2017 |
| Appledore Private Day Nursery Ltd | Education | 2014 |
| Applesmile Limited | Real estate | 2021 |
| Appletex (International) Holdings Ltd | Professional & scientific | 2022 |
| Appletex (International) Limited | Manufacturing | 1978 |
| Applewood Accountancy Ltd | Professional & scientific | 2011 |
| Applewood Data Services Limited | Construction | 2005 |
| Appliances Oldham Ltd | Wholesale & retail | 2021 |
| Apprentice Living Limited | Hospitality | 2025 |
| APS Land and Developments Ltd | Construction | 2025 |
| APS Properties and Investments Limited | Real estate | 2025 |
| APS159 Limited | Arts & recreation | 2021 |
| APX Consultants Ltd | Professional & scientific | 2025 |
| AQ PTI Limited | Real estate | 2022 |
| AQI Holdings Limited | Information & communication | 2015 |
| AQS Business Solution Ltd | Professional & scientific | 2023 |
| Aqua Safe Solutions Limited | Professional & scientific | 2025 |
| Aqua Verdant Ltd | Manufacturing | 2024 |
| Aquarius Decorators Limited | Construction | 2019 |
| Aquatzi Ltd | Arts & recreation | 2015 |
| AR Beauty & Training Academy by Amina Limited | Other services | 2025 |
| AR DM Properties Ltd | Real estate | 2023 |
| AR Europe Ltd. | Wholesale & retail | 2015 |
| AR Infosys Limited | Information & communication | 2018 |
| AR Peak Limited | Education | 2022 |
| AR Prime Motors Ltd | Wholesale & retail | 2024 |
| AR Taxi Cars Ltd | Administrative & support | 2024 |
| AR ZEN Zone Limited | Wholesale & retail | 2024 |
| Ar&M Group Limited | Wholesale & retail | 2022 |
| Ar-Cnc Ltd | Manufacturing | 2025 |
| ARA Property Group Limited | Real estate | 2023 |
| Arachis Property Ltd | Real estate | 2022 |
| Arafah Rahman Ltd | Real estate | 2024 |
| Aran Road Construction Limited | Manufacturing | 2016 |
| ARB Global Ltd | Wholesale & retail | 2019 |
| ARB Innovators Ltd | Information & communication | 2021 |
| Arbaz&Bro Ltd | Wholesale & retail | 2022 |
| Arbeez Ltd | Hospitality | 2019 |
| ARC & the Art Limited | Administrative & support | 2026 |
| ARC Assets Ltd | Real estate | 2017 |
| ARC Assist Ltd | Financial services | 2025 |
| ARC Industrial Welding Limited | Manufacturing | 2018 |
| ARC Internet Limited | Information & communication | 2010 |
| ARC NW Ltd | Administrative & support | 2023 |
| Arc-Pay Ltd | Information & communication | 2019 |
| Arcarta Ltd | Professional & scientific | 2015 |
| Archer Blinds Limited | Construction | 2003 |
| Archr Consulting Limited | Administrative & support | 2025 |
| Arco Property Holdings Ltd | Real estate | 2025 |
| Arcoris Ltd | Real estate | 2026 |
| Arcotex Limited | Manufacturing | 2025 |
| Arctic Spas Eryri Ltd | Wholesale & retail | 2025 |
| Ardent Inspection Services Limited | Professional & scientific | 2022 |
| Ardent Virtual Limited | Administrative & support | 2024 |
| Arder Limited | Other services | 2017 |
| Ardere Solutions Ltd | Construction | 2011 |
| Ardern's of Oldham Limited | Real estate | 1947 |
| Areeba Nazir Ltd | Administrative & support | 2016 |
| Ares Firepro Ltd | Construction | 2022 |
| Ares Pro Development Ltd | Construction | 2020 |
| Arewa Security Services Ltd | Administrative & support | 2023 |
| Argentsky Operations Ltd | Other services | 2025 |
| ARI Barbers Oldham Ltd | Other services | 2024 |
| Aria Intelligent Solutions Limited | Administrative & support | 2012 |
| Aria's Science Ltd | Information & communication | 2018 |
| Ariba (Ramsbottom) Ltd | Hospitality | 2026 |
| Arielle's Property Ltd | Real estate | 2023 |
| Aries Export Ltd | Water & waste | 2025 |
| Arif Legal Ltd | Professional & scientific | 2025 |
| Aringold UK Limited | Administrative & support | 2025 |
| Arisas Signature Limited | Wholesale & retail | 2026 |
| Aristocrat Bespoke Furnishings Limited | Wholesale & retail | 2019 |
| Aristot Learning Ltd | Education | 2025 |
| Arjal Limited | Real estate | 2011 |
| ARK Financial Planning Limited | Financial services | 2003 |
| Arkady Management Limited | Administrative & support | 2003 |
| ARL Real Estate Limited | Real estate | 2021 |
| Arlington Group Properties Ltd | Real estate | 2017 |
| Arlo Vitamins Ltd | Wholesale & retail | 2025 |
| Armaan Properties Oldham Ltd | Administrative & support | 2017 |
| Armacell Insulation UK Holding Limited | Financial services | 2012 |
| Armacell United Kingdom Holding Limited | Financial services | 2000 |
| Armada Healthcare Ltd | Health & social care | 2010 |
| Armchair Oasis Ltd | Wholesale & retail | 2025 |
| Armer Quality Components Limited | Manufacturing | 1989 |
| Armous Foods Ltd | Hospitality | 2017 |
| Armstrong Containers Ltd | Administrative & support | 2019 |
| Armstrong Developments Limited | Real estate | 2008 |
| Armstrong Lettings Ltd | Administrative & support | 2019 |