| 1-2-3 Bounce Ltd | Manufacturing | 2019 |
| 3PAREZ Limited | Real estate | 2025 |
| A & H Ceiling Limited | Construction | 2017 |
| A C S Bower Limited | Construction | 2004 |
| A&N Building Solutions Ltd | Construction | 2014 |
| A.P.C. Garden Services Ltd | Administrative & support | 2021 |
| Abacus Edutech Limited | Information & communication | 2022 |
| Abacus Training Solutions Ltd | Education | 2022 |
| Abitar Properties Limited | Households | 2017 |
| Accessible Motor Company (WAV) Limited | Wholesale & retail | 2009 |
| Ace Taxis (West Oxfordshire) Limited | Transport & logistics | 2009 |
| AD Frost Consulting Ltd | Financial services | 2017 |
| ADD Impact Advisory Ltd | Professional & scientific | 2025 |
| Adekkd Care Services Ltd | Administrative & support | 2019 |
| Adfen Investments Limited | Financial services | 2013 |
| Advanced Fibreoptic Engineering Limited | Manufacturing | 2005 |
| Advanced Oral Healthcare Solutions Limited | Manufacturing | 2018 |
| Advertasty Ltd | Professional & scientific | 2023 |
| Afors Women’S Health Limited | Health & social care | 2019 |
| AGE of Love Property Ltd | Real estate | 2025 |
| AIQ Decisions Ltd | Information & communication | 2023 |
| Airbus Military UK Limited | Manufacturing | 2012 |
| Airtanker Finance Limited | Administrative & support | 2007 |
| Airtanker Holdings Limited | Administrative & support | 2007 |
| Airtanker Limited | Administrative & support | 2007 |
| Airtanker Services Limited | Transport & logistics | 2007 |
| AJD Tax Limited | Professional & scientific | 2021 |
| AJF Carpentry Ltd | Construction | 2026 |
| Alchem Trading Ltd | Wholesale & retail | 2023 |
| Alessia&Co Ltd | Health & social care | 2021 |
| ALL Star South Ltd | Hospitality | 2026 |
| Allsworth Roofing Limited | Construction | 2001 |
| Alma Global Limited | Administrative & support | 2025 |
| Alma Risk Limited | Administrative & support | 2015 |
| Almas Saba Limited | Wholesale & retail | 2024 |
| Alto Energy Limited | Wholesale & retail | 2016 |
| Alto Investments & Property Limited | Real estate | 2020 |
| AM Wireless Ltd | Information & communication | 2024 |
| Amaav Limited | Real estate | 2025 |
| AMN Ayub Ltd | Wholesale & retail | 2025 |
| Apadana Renovation Ltd | Construction | 2025 |
| Apex GSS Limited | Administrative & support | 2015 |
| Apex Loft Solutions Ltd | Construction | 2025 |
| Applebeegreen Ltd | Extraterritorial | 2015 |
| Appledeane Wood Ltd | Real estate | 2025 |
| Aqua-Tek Engineering Limited | Construction | 2010 |
| Aranova Systems Limited | Information & communication | 2015 |
| Arcus Underfloor Limited | Wholesale & retail | 2023 |
| Argyll Defence & Security Advisors Limited | Public administration | 2025 |
| Arhwithrans Limited | Construction | 2020 |
| Arterial Moving Limited | Transport & logistics | 2000 |
| Artisan Nook Ltd | Wholesale & retail | 2025 |
| Astongold Limited | Arts & recreation | 2006 |
| Asyncjam Ltd | Information & communication | 2023 |
| Aurora Quality Inspections Ltd | Construction | 2022 |
| Auto Skinz Wrapping Limited | Professional & scientific | 2025 |
| Autotex Repair Limited | Wholesale & retail | 2020 |
| Avalon Software (UK) Limited | Information & communication | 2004 |
| Aylesbury Mushrooms (Farms) Limited | Agriculture & fishing | 1945 |
| Azra Barber Ltd | Other services | 2021 |
| Azrt Limited | Real estate | 2025 |
| B Dearman Joinery Limited | Wholesale & retail | 2006 |
| B&E Academy Ltd | Education | 2025 |
| B.S.L Window & Door Solutions Ltd | Construction | 2025 |
| Backops Limited | Hospitality | 2019 |
| Baddr Ltd | Information & communication | 2026 |
| Baij Ltd | Professional & scientific | 2017 |
| Barbers of Corn Street Limited | Other services | 2009 |
| Bari Store Ltd | Wholesale & retail | 2025 |
| Barkode Pet Supplies Ltd | Wholesale & retail | 2025 |
| BE Boxed Limited | Wholesale & retail | 2011 |
| Begbroke Smart Repair Limited | Wholesale & retail | 2015 |
| Belinha Limited | Health & social care | 2020 |
| Belstone Management Services Limited | Administrative & support | 2011 |
| Bennett Shipping Ltd | Financial services | 2023 |
| Bennetts Property Maintenance Ltd | Construction | 2024 |
| Better Workplace Limited | Professional & scientific | 2024 |
| BFL Training Limited | Other services | 2010 |
| BG Car Keys Limited | Professional & scientific | 2022 |
| Big Fish Farm Community Interest Company | Agriculture & fishing | 2024 |
| Black Bourton Road Management Company Limited | Extraterritorial | 2007 |
| Blenheim Roofing and Property Maintenance Oxfordshire Ltd | Construction | 2021 |
| Blizzard Security Services Ltd | Administrative & support | 2023 |
| Bluebell Healthcare Solutions Ltd | Health & social care | 2024 |
| Bluebell Property Construction Limited | Construction | 2026 |
| BNM Property Limited | Real estate | 2015 |
| Bobteddy Images Limited | Arts & recreation | 2015 |
| Boot & Associates Limited | Manufacturing | 2010 |
| Bourton Road Butchers Ltd | Wholesale & retail | 2018 |
| Boutique Box Ltd | Wholesale & retail | 2022 |
| Braemont Properties Ltd | Real estate | 2025 |
| Brecon LLP | | 2006 |
| Brightinho Mentality Ltd | Transport & logistics | 2025 |
| Brikly Ltd | Information & communication | 2025 |
| Brize Self Drive Limited | Administrative & support | 2018 |
| Broadshires Fencing Supplies Limited | Wholesale & retail | 2025 |
| Broadsword Management Services Limited | Professional & scientific | 2012 |
| Brunel Safety Solutions Limited | Professional & scientific | 2014 |
| Brylloyd Interiors Limited | Manufacturing | 2026 |
| Business Technologies Ltd | Information & communication | 2003 |