| Acumen Systems Limited | Information & communication | 2016 |
| Acute Care Chiropractic Clinic Limited | Health & social care | 2002 |
| Acute Gym Services Ltd | Manufacturing | 2019 |
| Acute Heating Ltd | Construction | 2022 |
| ACW Solutions Ltd | Information & communication | 2013 |
| ACW Tradelink Ltd | Wholesale & retail | 2024 |
| AD & MAK Ltd | Other services | 2024 |
| AD Capital Limited | Real estate | 2021 |
| AD Compliance & Technical Services Limited | Professional & scientific | 2010 |
| AD Consulting Group Ltd | Administrative & support | 2025 |
| AD Electricals Ltd | Construction | 2025 |
| AD Electrics Limited | Construction | 2015 |
| AD Grip Limited | Construction | 2024 |
| AD Holdings (Yorkshire) Ltd | Real estate | 2020 |
| AD Marketing Leeds Ltd | Professional & scientific | 2025 |
| AD Moody Limited | Professional & scientific | 2025 |
| AD Optical Ltd | Other services | 2010 |
| AD Outdoor Solutions Ltd | Administrative & support | 2024 |
| AD Plastering UK Commercial Ltd | Construction | 2016 |
| AD Plumbing Limited | Construction | 2023 |
| AD Project Delivery Ltd | Information & communication | 2019 |
| AD Renewable Lending Limited | Financial services | 2018 |
| AD Softwares Ltd | Information & communication | 2025 |
| AD Surveying Ltd | Administrative & support | 2021 |
| AD10 Limited | Health & social care | 2019 |
| AD3 Envelope Printers Limited | Manufacturing | 2005 |
| ADA Meher Ltd | Administrative & support | 2025 |
| Adage Dance Ltd | Wholesale & retail | 2015 |
| Adair Building Services (Yorkshire) Ltd | Construction | 2024 |
| Adam Drummond Sports Medicine Limited | Health & social care | 2024 |
| Adam Gray Hairdressing Limited | Other services | 2022 |
| Adam Grocers Ltd | Wholesale & retail | 2014 |
| Adam Holdings (Leeds) Limited | Professional & scientific | 2014 |
| Adam ISA Zack Limited | Real estate | 1998 |
| Adam Jatt Ltd | Hospitality | 2025 |
| Adam Leeds Ltd | Hospitality | 2026 |
| Adam Mario Khan-Dessi Ltd | Extraterritorial | 2022 |
| Adam Pinks Ltd | Wholesale & retail | 2026 |
| Adam's Plumbing & Maintenance Limited | Construction | 2019 |
| Adammukhtar Ltd | Wholesale & retail | 2025 |
| Adamo Exchange Ltd | Wholesale & retail | 2021 |
| Adams Electrical Safety Limited | Construction | 2014 |
| Adams Leeds Store Ltd | Wholesale & retail | 2025 |
| Adams Letting & Management Ltd | Hospitality | 2018 |
| Adams Media and Entertainment Ltd | Professional & scientific | 2026 |
| Adams PHG Ltd | Construction | 2022 |
| Adams Potatoes Limited | Wholesale & retail | 2005 |
| Adams Properties (UK) Limited | Real estate | 1999 |
| Adams Property Lettings Ltd | Real estate | 2022 |
| Adams RTT Ltd | Administrative & support | 2018 |
| Adams Tailored Travel Ltd | Administrative & support | 2024 |
| Adams Tebb (Skipton) Limited | Wholesale & retail | 2007 |
| Adams Tyres Limited | Wholesale & retail | 2020 |
| Adamson Project Management Ltd | Construction | 2024 |
| Adamson Studio Ltd | Information & communication | 2023 |
| Adapt Care Ltd | Wholesale & retail | 2020 |
| Adapt Labs Ltd | Information & communication | 2017 |
| Adapt Resettlement CIC | Hospitality | 2023 |
| Adaptive Edge Ltd | Professional & scientific | 2016 |
| Adaptive Integration Partners Limited | Information & communication | 2008 |
| Adaptive Tech Ltd | Information & communication | 2016 |
| Adarak Ltd | Information & communication | 2019 |
| Adarsh Limited | Health & social care | 2011 |
| Adav Logistics Ltd | Transport & logistics | 2026 |
| ADB Familyco | Financial services | 2018 |
| ADB Holdings Limited | Real estate | 2017 |
| ADC Engineering Services Ltd | Professional & scientific | 2025 |
| Adco Products Limited | Manufacturing | 2003 |
| Adcra Healthcare Ltd | Health & social care | 2024 |
| ADD Properties (Yorkshire) Ltd | Real estate | 2025 |
| ADD Property Holdings Ltd | Real estate | 2022 |
| ADD Roofing, Building & Scaffolding Contractors Ltd | Construction | 2026 |
| Adda's Cleaning Co Ltd | Administrative & support | 2026 |
| Addall Ltd | Real estate | 2021 |
| Added Value Concepts Limited | Wholesale & retail | 2001 |
| Addictive Media Limited | Information & communication | 2003 |
| Addiscombe DSP Ltd | Households | 2004 |
| Addison & Steele Tailoring Limited | Extraterritorial | 2000 |
| Additive Design Ltd | Professional & scientific | 2015 |
| Addlestone Keane Limited | Professional & scientific | 2012 |
| Addreach Limited | Health & social care | 2016 |
| Addyson Pope Limited | Professional & scientific | 2024 |
| ADE Nexus Limited | Professional & scientific | 2026 |
| Adeen Enterprises Ltd | Real estate | 2025 |
| Adeen Excellence Ltd | Real estate | 2025 |
| Adehs Ltd | Wholesale & retail | 2023 |
| Adekola Creative Wellbeing Ltd | Arts & recreation | 2026 |
| Adel Aesthetic Clinic Limited | Other services | 2016 |
| Adel Community Garden CIC | Arts & recreation | 2023 |
| Adel Leeds Ltd | Real estate | 2022 |
| Adel Legal Ltd | Administrative & support | 2018 |
| Adel Limited | Real estate | 2024 |
| Adel Management Company Limited | Households | 1985 |
| Adel Management Consultancy Limited | Professional & scientific | 2013 |
| Adel Mill Management Limited | Households | 1993 |
| Adel Plumbing & Heating Ltd | Construction | 2016 |
| Adel Skin Clinic Ltd | Other services | 2024 |
| Adel TAP Ltd | Hospitality | 2024 |
| Adel Tiling Solutions Limited | Construction | 2014 |
| Adel WAR Memorial Association | Other services | 2014 |