| 1-22 Tarn Howes Close Residents Management Company Ltd | Households | 2020 |
| 10 Hampton Road Ltd | Real estate | 2013 |
| 121-131 Battalion Way RTM Company Ltd | Households | 2024 |
| 181-183 ST John Street Freehold Limited | Households | 2022 |
| 18KEYS Ltd | Health & social care | 2020 |
| 19 Property Development Limited | Construction | 2019 |
| 1ST Glass Window Cleaning Ltd | Administrative & support | 2014 |
| 20 Below Limited | Professional & scientific | 2007 |
| 202 Lower Way Limited | Households | 2020 |
| 24-7 Concrete Pumping Services Limited | Construction | 2007 |
| 246 London Road Management Company Limited | Households | 1984 |
| 248 London Road Management Company Limited | Households | 1984 |
| 24T Electrical Limited | Extraterritorial | 2012 |
| 27 Ideas Ltd | Information & communication | 2016 |
| 28 Kenwyn Road Limited | Real estate | 2026 |
| 2LUCKY Ltd | Hospitality | 2022 |
| 2M Property Services Limited | Construction | 2006 |
| 2P Property Ltd | Real estate | 2021 |
| 30-33 Harbury Court RTM Company Ltd | Households | 2021 |
| 3L Limited | Information & communication | 2025 |
| 3M Nails & Beauty Limited | Other services | 2022 |
| 3T Additive Manufacturing Limited | Manufacturing | 1997 |
| 3T Additive Manufacturing Polymers Ltd | Manufacturing | 2020 |
| 4 Kingdoms Ltd | Arts & recreation | 2011 |
| 4-WAY Limited | Real estate | 2002 |
| 4U Gardens Ltd | Administrative & support | 2025 |
| 500 Holdings Limited | Financial services | 2025 |
| 500 Logistics Limited | Transport & logistics | 2016 |
| 500 Moons Limited | Information & communication | 2022 |
| 500 Properties Limited | Real estate | 2025 |
| 6 Park Avenue Limited | Households | 2000 |
| 66 Harwood Road Limited | Real estate | 2013 |
| 88 Belgrave Road Limited | Households | 2008 |
| A & a Restaurant Ltd | Hospitality | 2019 |
| A B Collins Brickwork Limited | Construction | 2005 |
| A K L Trading Ltd | Hospitality | 2011 |
| A to B Executive Cars Ltd. | Transport & logistics | 2009 |
| A&A Catering Services Ltd | Hospitality | 2022 |
| A&N Treats Ltd | Wholesale & retail | 2026 |
| A.S.K Restaurant Ltd | Hospitality | 2025 |
| A.T.M. Limited | Information & communication | 1980 |
| A1 Plant Limited | Administrative & support | 2015 |
| Aarya’S Physio and Rehabilitation Ltd | Health & social care | 2025 |
| AB Leisure Management Ltd | Arts & recreation | 2022 |
| AB Skip Hire Ltd | Water & waste | 2025 |
| Abaillie Ltd | Transport & logistics | 2025 |
| Abbotville Properties Ltd | Construction | 2019 |
| Abec Developments Limited | Real estate | 2026 |
| Able Contracts Refurbishment Ltd | Construction | 1997 |
| Above PAR Translations Limited | Professional & scientific | 2023 |
| Absolutely Steaming Ltd | Other services | 2008 |
| Abundant Land and New Homes UK Limited | Real estate | 2020 |
| AC Lets Ltd | Real estate | 2020 |
| Accounting & Taxation Centre BTD Ltd | Professional & scientific | 2018 |
| Accrete Financial Solutions Limited | Professional & scientific | 2023 |
| Ace Performance Training Ltd | Arts & recreation | 2023 |
| Acorn Furniture Hire Limited | Arts & recreation | 2012 |
| Acorn Testing Limited | Information & communication | 2016 |
| ACP Estates LLP | | 2012 |
| Acra Limited | Administrative & support | 2010 |
| Acres of FUN Limited | Education | 2003 |
| ACS Electrical (UK) Ltd | Construction | 2002 |
| Active Plumbing Services Ltd | Construction | 2006 |
| Active-Display Solutions Ltd | Manufacturing | 2017 |
| Active-Edge Solutions Ltd | Professional & scientific | 2022 |
| Adam & EVE Hair 2014 Limited | Other services | 2014 |
| Adbro Controls Limited | Professional & scientific | 1998 |
| Adept-Nx Ltd | Professional & scientific | 2012 |
| Admin Limited | Professional & scientific | 1994 |
| Admobility Limited | Extraterritorial | 2013 |
| Adrian Eeles Limited | Wholesale & retail | 2011 |
| Advantage Benefits Ltd | Administrative & support | 2016 |
| Adwood Court (Thatcham) Management Company Limited | Households | 1991 |
| AER Minerals Ltd | Mining & quarrying | 2026 |
| Aestheticproducts Limited | Wholesale & retail | 2025 |
| Afcp Limited | Information & communication | 2019 |
| African Safari Tours Limited | Professional & scientific | 2017 |
| AG Data Analysis Limited | Professional & scientific | 2009 |
| Agibility Ltd | Information & communication | 2013 |
| AGILITY4U Ltd | Information & communication | 2023 |
| Agleam Windows Limited | Administrative & support | 2015 |
| Agratas Info Limited | Real estate | 2023 |
| Ai-Ingelby Ltd | Professional & scientific | 2026 |
| Aima Infotech Limited | Information & communication | 2024 |
| Airborne Visual Media Limited | Extraterritorial | 2024 |
| Aivilo Computer Limited | Wholesale & retail | 2022 |
| Aivilo Digital Accountancy Limited | Professional & scientific | 2022 |
| Aiwon Business Services Ltd. | Information & communication | 2018 |
| Aiwon Consultancy Limited | Information & communication | 2018 |
| AJ Gray Ltd | Professional & scientific | 2011 |
| Ajacs IT Consulting Ltd | Information & communication | 2019 |
| AJB Electrical Contracting Ltd | Manufacturing | 2011 |
| AJB Plumbing and Heating (Berkshire) Ltd | Construction | 2019 |
| Akatech Limited | Wholesale & retail | 2019 |
| AKD Consultants Limited | Administrative & support | 2015 |
| Alberts Dent Services Limited | Health & social care | 2020 |
| Albon GAS Services Limited | Construction | 2013 |
| Alex Howard Group Ltd | Financial services | 2020 |
| Alfa GSK Ltd | Hospitality | 2022 |
| Alfred & Alfred Limited | Real estate | 2010 |