| Bowerbird Landscapes Limited | Administrative & support | 2026 |
| Bozpo Limited | Health & social care | 1998 |
| Brambles Partnership Ltd. | Agriculture & fishing | 2016 |
| Brandcast Health Limited | Extraterritorial | 1999 |
| Brandcast Limited | Extraterritorial | 2008 |
| Breathalyser Direct Ltd | Wholesale & retail | 2007 |
| Brian Leach Consulting Limited | Information & communication | 2004 |
| Bridgwood & Co. Ltd | Professional & scientific | 2024 |
| Britannia Mining Solutions (UK) Limited | Professional & scientific | 2025 |
| British Fluid Power Association Limited | Administrative & support | 1964 |
| BRM Delivery Limited | Transport & logistics | 2025 |
| Broctun Estates Limited | Real estate | 2016 |
| Bromley's of Cotswolds Ltd | Hospitality | 2024 |
| Bronsens Consulting Limited | Professional & scientific | 2008 |
| Brooke Cars Limited | Wholesale & retail | 2003 |
| Brown COW Events Ltd | Hospitality | 2024 |
| Brown COW Food Company Ltd | Hospitality | 2021 |
| Bruern Enterprises Limited | Agriculture & fishing | 1979 |
| Bruern Holdings Ltd | Agriculture & fishing | 2024 |
| Bryars Limited | Information & communication | 2022 |
| Bugeja Investments Ltd | Real estate | 2016 |
| Building Stone Limited | Manufacturing | 2017 |
| Burford Contracting and Consulting Limited | Extraterritorial | 2014 |
| Burford Highway Hotel Property Company Limited | Extraterritorial | 1977 |
| Burford Road Management Company Limited | Households | 1999 |
| Burnish & Co. Limited | Professional & scientific | 2013 |
| Burnt Orange (UK) Limited | Other services | 2013 |
| Business Grant Services Limited | | 1986 |
| Buttercups Cotswolds Limited | Education | 2025 |
| Byline Developments Limited | Construction | 2008 |
| Byline Group Limited | Administrative & support | 2007 |
| C B Collier Quarry Limited | Real estate | 2019 |
| C E Izod Ltd | Agriculture & fishing | 2015 |
| Cafe DE LA Post Ltd | Wholesale & retail | 2019 |
| Calmworks Ltd. | Extraterritorial | 2018 |
| Canine Games Ltd | Information & communication | 2024 |
| Canis Dog Grooming Ltd | Other services | 2023 |
| Care Compassion and Conversation Ltd | Health & social care | 2013 |
| Care in Comfort Limited | Other services | 2022 |
| Cashmere Dachshund Ltd | Manufacturing | 2013 |
| Castle Bank Consulting Ltd | Extraterritorial | 2013 |
| Catherine Merridale Limited | Education | 2012 |
| Cellmark Limited | Professional & scientific | 2021 |
| Centaur Travel Retail Europe Limited | Wholesale & retail | 2000 |
| Cftx Ltd | Information & communication | 2025 |
| Chad Lakes Ltd | Hospitality | 2025 |
| Chadlington Quality Foods Limited | Wholesale & retail | 2001 |
| Chadlington Village Green | Administrative & support | 2010 |
| Chalk International Limited | Real estate | 2017 |
| Chamserve Limited | Administrative & support | 2006 |
| Chaordic Limited | Information & communication | 2012 |
| Charisma Capital Limited | Real estate | 2011 |
| Charlbury Accountancy Services Ltd | Administrative & support | 2013 |
| Charlbury Brewing Company Limited | Manufacturing | 2004 |
| Charlbury Cricket Club | Arts & recreation | 2008 |
| Charlbury Deli and Cafe Limited | Wholesale & retail | 1991 |
| Charlbury Riverside Festival CIC | Arts & recreation | 2021 |
| Charlbury Technology Limited | Information & communication | 2017 |
| Charlie Longsdon Racing Limited | Arts & recreation | 2014 |
| Charlsbury Enterprises Ltd | Hospitality | 2018 |
| Chaston Conway Limited | Real estate | 2006 |
| Chatheroe Dog Training Ltd | Administrative & support | 2025 |
| Cherubs Nursery and After Care Limited | Health & social care | 2012 |
| Chipping Norton Body Shop Ltd | Wholesale & retail | 2013 |
| Chipping Norton Builders Limited | Construction | 2010 |
| Chipping Norton Cars Ltd | Transport & logistics | 2020 |
| Chipping Norton Cellars Ltd | Wholesale & retail | 2026 |
| Chipping Norton Container Storage Limited | Extraterritorial | 2025 |
| Chipping Norton Lido Limited | Arts & recreation | 2004 |
| Chipping Norton Self Storage Limited | Extraterritorial | 2018 |
| Chipping Norton Storage Limited | Administrative & support | 2014 |
| Chipping Norton Tyres Ltd | Other services | 2017 |
| Chippy Pizza Ltd | Hospitality | 2023 |
| Chivel Farm Limited | Agriculture & fishing | 1966 |
| Chivel Limited | Professional & scientific | 2008 |
| Chopperholdings Ltd | Financial services | 2026 |
| Christophers Cordials Limited | Manufacturing | 2024 |
| Church View (Shipton Under Wychwood) Management Company Limited | Households | 2001 |
| Churchill Farm Limited | Agriculture & fishing | 2017 |
| Circularity Solutions Limited | Professional & scientific | 2017 |
| City Cows Ltd | Wholesale & retail | 2013 |
| Cjwb Property Limited | Real estate | 2021 |
| Clack & Pettifer Limited | Construction | 2004 |
| Claire Hudson Limited | Health & social care | 2010 |
| Clan Alpine Limited | Real estate | 2026 |
| Clarke Business Group Limited | Financial services | 2011 |
| Clarke Construction Limited | Construction | 2009 |
| Clayfield Investments Limited | Arts & recreation | 1962 |
| Cleaning 21 Commercial Ltd | Administrative & support | 2016 |
| CLEANING21 Ltd | Administrative & support | 2016 |
| Cleeves Farm Estates LLP | | 2010 |
| Clement Wyatt Ltd | Wholesale & retail | 2010 |
| Clockwork Moon Limited | Manufacturing | 2012 |
| Clothesource Limited | Information & communication | 1999 |
| Clothesource Management Services Limited | Professional & scientific | 1999 |
| Club Key Limited | Information & communication | 2021 |
| Coached by Gemma Ltd | Education | 2025 |
| Cobalt Robotics Ltd | Professional & scientific | 2025 |
| Cochranes of Oxford Limited | Manufacturing | 1962 |
| Coldairbnb Limited | Arts & recreation | 2023 |