| 00475198 Limited | Extraterritorial | 1949 |
| 02869982 Limited | Wholesale & retail | 1993 |
| 1 Kings Grove Limited | Households | 1993 |
| 11-22 Islet Park Property Management Limited | Hospitality | 1997 |
| 11:11 Systems UK Limited | Information & communication | 2007 |
| 12 ST Lukes Road Freehold Limited | Households | 2005 |
| 121HEALTH&CARE Limited | Health & social care | 2015 |
| 160 Sinclair Road Limited | Households | 1996 |
| 1650 Coffee Co Ltd | Hospitality | 2024 |
| 17 Hillside RTM Company Limited | Households | 2005 |
| 170 Prospect Road Management Limited | Households | 2001 |
| 196 Tilehurst Road (Reading) Management Company Limited | Households | 2006 |
| 1ST-EUROPEAN Limited | Administrative & support | 1996 |
| 2 Brookes Consulting Limited | Information & communication | 2007 |
| 2-IN-2-1 Ltd | Other services | 1999 |
| 20 Rocks Lane Management Company Limited | Real estate | 1989 |
| 28 Alma Road Management Company Limited | Households | 1998 |
| 28 Oriental Place Limited | Real estate | 2005 |
| 33 Coley Hill RTM Company Limited | Real estate | 2005 |
| 35 Barn Crescent Management Company Limited | Real estate | 2004 |
| 360 Media Studio Ltd | Information & communication | 2005 |
| 39/41 Barnsdale Road Reading Limited | Extraterritorial | 1994 |
| 3K Property Services Limited | Real estate | 2000 |
| 3M Pension Trustees Limited | Professional & scientific | 1979 |
| 3M Products Limited | Financial services | 1973 |
| 3M UK Holdings Limited | Financial services | 1929 |
| 3M United Kingdom Public Limited Company | Manufacturing | 1973 |
| 4 Dukes Avenue Chiswick Limited | Extraterritorial | 1994 |
| 4 Season Care Ltd | Health & social care | 2014 |
| 4 U Cars Limited | Manufacturing | 1978 |
| 44 Baker Street Limited | Real estate | 2007 |
| 45 and 47 Church Road Earley (Reading) Management Company Limited | Administrative & support | 1995 |
| 487-493 Urrw FH Co Ltd | Households | 2026 |
| 4X4 - Without a Club Limited | Other services | 2006 |
| 53 Chandos Road Limited | Real estate | 2006 |
| 63 Hencroft Street South Limited | Households | 2006 |
| 7 Erleigh Road Reading Management Company Limited | Households | 1994 |
| 7-13 RAY Mill Road West Management Company Limited | Households | 1995 |
| 71A Hamilton Road Limited | Households | 1985 |
| 80 Osborne Road, Windsor (Management) Limited | Real estate | 1985 |
| 9R Distribution Limited | Administrative & support | 1995 |
| A & a TV Limited | Administrative & support | 1998 |
| A & J Builders Limited | Construction | 2004 |
| A & S Property Contractors Ltd | Construction | 2001 |
| A 2 O Coaching Limited | Other services | 2003 |
| A Buxey Electrical & Data Ltd | Construction | 1997 |
| A Chandler Trading Limited | Financial services | 2025 |
| A K Travel Worldwide Limited | Transport & logistics | 2005 |
| A M Marine Trimming Ltd | Manufacturing | 2020 |
| A One Builders & Merchants Ltd | Construction | 2001 |
| A P Souvenirs & Gifts Limited | Wholesale & retail | 2007 |
| A.B. Fashions Limited | Administrative & support | 1998 |
| A.B.C. Services (Thatcham) Limited | Construction | 2003 |
| A.D.S. Partners Limited | Construction | 2001 |
| A.E. Management Services Ltd | Real estate | 1994 |
| A.H.Lansley Residential Limited | Real estate | 2004 |
| A.L.S. Presentation Limited | Manufacturing | 1992 |
| A.Maan Architectural Services Limited | Professional & scientific | 2003 |
| A1 Property Services Limited | | 1988 |
| Abacus Solutions Limited | Real estate | 1994 |
| Abbey Windows and Conservatories Limited | Administrative & support | 2004 |
| Abbotwood Limited | Education | 2007 |
| Abbvie Biotherapeutics Limited | Health & social care | 2016 |
| ABC Computer Engineers Limited | Wholesale & retail | 1998 |
| AC Technical Consulting Ltd | Professional & scientific | 2021 |
| Academe Development Limited | Administrative & support | 2006 |
| Academy Windows and Conservatories Limited | Construction | 2000 |
| Accessible Retail Limited | Other services | 2002 |
| Accommodation Windsor Limited | Hospitality | 2014 |
| Ace Thames Security Limited | Administrative & support | 2001 |
| Acer Management Services Ltd | Professional & scientific | 2004 |
| Aces Project Management Limited | Professional & scientific | 2004 |
| Acorn Construction (Newbury) Limited | Construction | 2003 |
| Activation Services Limited | Information & communication | 1999 |
| Active Design Consultants Limited | Information & communication | 1998 |
| Active Risk Management Services Limited | Arts & recreation | 2006 |
| Adam Take -Away Limited | Hospitality | 2025 |
| Adaptosucceed Ltd. | Information & communication | 2007 |
| Adira Technologies Limited | Information & communication | 2020 |
| Adspay Ltd | Professional & scientific | 2003 |
| Advancechief Limited | Extraterritorial | 1992 |
| Advanced Audio and Vision Limited | Professional & scientific | 2001 |
| Advanced Stretch Ceilings, Walls & Blinds Limited | Construction | 2019 |
| Advancia Limited | Information & communication | 2023 |
| ADY Godwin Specialist Car Body Repairs Limited | Wholesale & retail | 2000 |
| AFE Limited | Professional & scientific | 2003 |
| Afton Chemical Limited | Manufacturing | 1975 |
| AGH Services Ltd | Real estate | 2006 |
| Agrim Global Solutions Ltd. | Information & communication | 2015 |
| AI Dizital Solutions Ltd | Information & communication | 2020 |
| Aimtoaid Limited | Information & communication | 1998 |
| Airinmar Limited | Administrative & support | 1995 |
| Akshire Springs Limited | Real estate | 2020 |
| Aldershot Exhaust Tyre & Battery Company Limited | | 1974 |
| Alere AS Holdings Limited | Professional & scientific | 2011 |
| Alere UK Holdings Limited | Professional & scientific | 2001 |
| Alexandra Road Reading (Management) Company Limited | Households | 1984 |
| Alexandriaforpress&Printing &Publishing Limited | Information & communication | 2020 |
| ALL Brick & Stone UK Limited | Wholesale & retail | 2003 |
| Alliance Strategies Limited | Information & communication | 2002 |