| 01864176 Limited | Wholesale & retail | 1984 |
| 03392200 Limited | Wholesale & retail | 1997 |
| 10 Aldebert Management Co Ltd | Households | 2021 |
| 11SAT Ltd | Real estate | 2018 |
| 132 Beach Road Limited | Financial services | 2019 |
| 1SAT XL LLP | | 2018 |
| 1ST Choice Partners LLP | | 2021 |
| 1ST Choice Property Investments Ltd. | Real estate | 2005 |
| 1ST Step Housing (Kent) Limited | Real estate | 2014 |
| 231 Studios Limited | Information & communication | 2024 |
| 235 Wynyard Woods Limited | Real estate | 2011 |
| 29 High Church Wynd Limited | Households | 2005 |
| 3 Park Road Limited | Households | 2007 |
| 3A Healthcare Ltd | Health & social care | 2023 |
| 3RD Planet Clothing Limited | Wholesale & retail | 2024 |
| 4 Seasons Home Improvements NE Ltd | Administrative & support | 2026 |
| 48 Chatsworth Road Ltd | Real estate | 2022 |
| 4ALPHA (9BG) Ltd | Real estate | 2019 |
| 4ALPHA Investments Ltd | Real estate | 2019 |
| 4ALPHA Partners LLP | | 2016 |
| 4EVER Cherished Ltd | Wholesale & retail | 2023 |
| 579 ATP Limited | Administrative & support | 2016 |
| 5X5 Solutions Limited | Information & communication | 2021 |
| 6 Madeira Parade Limited | Real estate | 2008 |
| 6/8 London Road Limited | Hospitality | 2011 |
| 60 Granada Management Limited | Real estate | 2026 |
| 66 Front Street Limited | Extraterritorial | 2015 |
| 718 Services Ltd | Administrative & support | 2023 |
| 71M Investments Ltd | Real estate | 2026 |
| 888 Enterprise Limited | Information & communication | 2021 |
| 999FINE Finds Limited | Wholesale & retail | 2026 |
| A & C Lewis WP Ltd | Administrative & support | 2024 |
| A & C Mccallum WP Ltd | Administrative & support | 2024 |
| A & K Zonfrillo WP Ltd | Professional & scientific | 2024 |
| A & P Moxon WP Ltd | Administrative & support | 2024 |
| A & R Sheekey Limited | Financial services | 2010 |
| A Britton & C Hewitt WP Ltd | Administrative & support | 2024 |
| A Flynn WP Ltd | Administrative & support | 2024 |
| A Hatch Specialist Practioner Services Limited | Health & social care | 2013 |
| A L Waterson Ltd | Professional & scientific | 2025 |
| A M Commissioning Limited | Construction | 2011 |
| A Malick (AM) Consultants Ltd | Construction | 2013 |
| A Paul Estates Ltd | Real estate | 2025 |
| A Paul Innovations Ltd | Health & social care | 2015 |
| A S Gupta Holdings Ltd | Financial services | 2024 |
| A V H Bricklaying & Building Services Limited | Construction | 2021 |
| A Watson WP Ltd | Administrative & support | 2024 |
| A Wilson Holdings Ltd | Real estate | 2023 |
| A Wilson Partnership LLP | | 2023 |
| A&A Drilling Ltd | Professional & scientific | 2014 |
| A&A Kaushal WP Ltd | Professional & scientific | 2024 |
| A&M Soleas WP Ltd | Administrative & support | 2024 |
| A&V Lindberg WP Ltd | Professional & scientific | 2024 |
| A. G. Haulage Services Ltd | Transport & logistics | 2017 |
| A19 Motor Company Ltd | Wholesale & retail | 2025 |
| A2B Electrical Limited | Construction | 2023 |
| A4CARECONNECT Limited | Administrative & support | 2023 |
| AAA Homecare Durham Limited | Health & social care | 2025 |
| AAA Homecare Northumberland Limited | Health & social care | 2025 |
| AAA Homecare Teesside Limited | Health & social care | 2025 |
| AAA Homecare Yorkshire Limited | Health & social care | 2025 |
| Aaaps Limited | Health & social care | 2013 |
| Aanco (UK) Limited | Manufacturing | 1983 |
| Aanco 2025 Limited | Financial services | 2025 |
| Aanco Group Limited | Financial services | 2021 |
| Aanco Holdings Limited | Financial services | 2020 |
| Aarna Properties Limited | Real estate | 2021 |
| AB Lettings Limited | Real estate | 2020 |
| Abacus Planning Management Limited | Professional & scientific | 2022 |
| Abba Direct Ltd | Other services | 2022 |
| ABC Counselling, Play Therapy & Family Solutions C.I.C. | Other services | 2015 |
| Able Docks Limited | Extraterritorial | 2011 |
| Able Humber Port Services Limited | Extraterritorial | 2011 |
| Able Ports Limited | Extraterritorial | 2011 |
| Able Redcar Port Limited | Transport & logistics | 2019 |
| Able South Tees Limited | Transport & logistics | 2019 |
| Able Teesport Ltd | Transport & logistics | 2019 |
| Able UK Ports Limited | Extraterritorial | 2011 |
| Abmf Property Services Ltd | Construction | 2019 |
| Above View Bar Ltd | Hospitality | 2025 |
| Absolute Estates Ltd | Real estate | 2019 |
| Absolute Trading & Commerce Holdings Ltd | Financial services | 2020 |
| Absolute Trading & Commerce Ltd | Wholesale & retail | 2020 |
| ABU Algassim Publishing House Limited | Information & communication | 2024 |
| ABZ Capitalz & Investments Ltd | Wholesale & retail | 2025 |
| Acapuk Limited | Financial services | 2024 |
| ACB Fabrications Limited | Construction | 2025 |
| Accelerated Business Solutions Limited | Information & communication | 2006 |
| Acculabs Diagnostics UK Limited | Health & social care | 2010 |
| Acculabs Ltd | Health & social care | 2026 |
| Acfw Property Lettings Limited | Real estate | 2020 |
| ACM Investments & Consultancy Limited | Financial services | 2019 |
| Acorn Care Providers Limited | Health & social care | 2012 |
| Acquitas LLP | | 2017 |
| Acredale Estates Limited | Real estate | 2002 |
| ACS Carpentry and Joinery Limited | Real estate | 2017 |
| ACTIV2 Limited | Wholesale & retail | 2015 |
| ACW Capital Ltd | Real estate | 2022 |
| ADA Supervision Limited | Construction | 2026 |
| Adadonis Ltd | Construction | 2023 |