| Control Entertainment Limited | Information & communication | 2008 |
| Cookes Contracts Limited | Administrative & support | 2009 |
| Cookschool Gregg Brown Limited | Education | 2025 |
| Coombe Hill Ltd | Professional & scientific | 2012 |
| Coombe Roofing and Structural Waterproofing Limited | Construction | 2021 |
| Cooper Brewer Ltd | Financial services | 2019 |
| Coostietech Ltd | Wholesale & retail | 2021 |
| Copper Octopus Ltd | Information & communication | 2014 |
| Core Golf Limited | Wholesale & retail | 2011 |
| Core Group Holdings Limited | Manufacturing | 2021 |
| Core Plumbing and Heating Ltd | Construction | 2015 |
| Core Plus Tuition Ltd | Education | 2023 |
| Core Production Limited | Manufacturing | 2019 |
| Core Real Estate Limited | Real estate | 2007 |
| Core Surgical Limited | Manufacturing | 1998 |
| Corezy Company Ltd | Administrative & support | 2009 |
| Cornelia LEX Limited | Administrative & support | 2020 |
| Cornhill Banbury Limited | Real estate | 2020 |
| Cornish Autocars Limited | Wholesale & retail | 2012 |
| Cornwall Realty Limited | Real estate | 2015 |
| Corpav Ltd | Construction | 2024 |
| Corporate Innovations Group Limited | Financial services | 2018 |
| Corporate Innovations Group Trustees Limited | Other services | 2023 |
| Corriefi Ltd | Professional & scientific | 2007 |
| Corse Concierge Limited | Professional & scientific | 2016 |
| Cosgrove Property Limited | Real estate | 2019 |
| Cosmin Rusu Limited | Wholesale & retail | 2019 |
| Costow Farms Limited | Agriculture & fishing | 2009 |
| Costy Doroftei Logistics Limited | Transport & logistics | 2019 |
| Cosy Wolf Ltd | Hospitality | 2019 |
| Cotefield Holdings Limited | Real estate | 2018 |
| Cotefield Nursery Limited | Wholesale & retail | 2009 |
| Cotefield Treecare Ltd | Agriculture & fishing | 2025 |
| Cotswold and Country Properties Limited | Real estate | 2021 |
| Cotswold Asset Finance Ltd | Financial services | 2022 |
| Cotswold Bespoke Properties Limited | Construction | 2023 |
| Cotswold Body Imaging Ltd | Health & social care | 2026 |
| Cotswold Building & Landscaping Works Limited | Construction | 2023 |
| Cotswold Bundles Ltd | Wholesale & retail | 2024 |
| Cotswold Cable Company Limited | Information & communication | 2020 |
| Cotswold Ceramics Ltd | Construction | 2020 |
| Cotswold Climate Limited | Construction | 2024 |
| Cotswold Dining Ltd | Hospitality | 2020 |
| Cotswold Eggs Limited | Agriculture & fishing | 2012 |
| Cotswold Farriers Limited | Other services | 2023 |
| Cotswold Finance Ltd | Financial services | 2022 |
| Cotswold Financial Services Ltd | Financial services | 2023 |
| Cotswold JDM Ltd | Wholesale & retail | 2023 |
| Cotswold Knit Ltd | Professional & scientific | 2011 |
| Cotswold Legal Limited | Professional & scientific | 2025 |
| Cotswold Marquees Limited | Manufacturing | 2004 |
| Cotswold Motor Works Ltd | Wholesale & retail | 2025 |
| Cotswold Recovery & Cars Ltd | Wholesale & retail | 2020 |
| Cotswold Sports Camps Limited | Education | 2021 |
| Cotswold Training Club Ltd | Arts & recreation | 2025 |
| Cotswold Walls, Trees & Fences Limited | Construction | 2003 |
| Cotswold Wills and Trusts Ltd | Professional & scientific | 2026 |
| Cotswold Wine Estate Ltd | Manufacturing | 2018 |
| Cotswolds Resorts Limited | Financial services | 2025 |
| Cotswolds to Coast Campers Ltd | Administrative & support | 2021 |
| Cotswoldskin Ltd | Health & social care | 2017 |
| Cotsworld Facilities Company Limited | Real estate | 2021 |
| Cotton Farm Consultancy Limited | Administrative & support | 2011 |
| Counting House RTM Company Limited | Households | 2025 |
| County OIL Tank Solutions Ltd | Wholesale & retail | 2016 |
| Court Information Limited | Information & communication | 1996 |
| Coventry Consulting Ltd | Professional & scientific | 2023 |
| Cpar Delivery Service Ltd | Wholesale & retail | 2024 |
| CR Property Management Limited | Real estate | 2017 |
| Cradle Farm Limited | Agriculture & fishing | 1997 |
| Crafted in Space Ltd | Wholesale & retail | 2023 |
| Crawmach Limited | Wholesale & retail | 2012 |
| CRE8IVE Solutions Ltd | Professional & scientific | 2013 |
| Cream of Cropredy Ltd | Hospitality | 2024 |
| Creative IPR Limited | Administrative & support | 2017 |
| Creative Scholars Consultancy Ltd | Professional & scientific | 2025 |
| Creativs Label Ltd | Other services | 2019 |
| Credoo Ltd | Wholesale & retail | 2015 |
| Creed Music Global Ltd | Information & communication | 2020 |
| Crescent Moon Limited | Wholesale & retail | 2023 |
| Cressida Productions Limited | Arts & recreation | 1985 |
| Crichton Francis Limited | Professional & scientific | 2002 |
| Cripps Recruitment Limited | Administrative & support | 2010 |
| CRM Advanced Limited | Information & communication | 2022 |
| Crm-Uk.Com Limited | Information & communication | 2009 |
| Crmh Limited | Administrative & support | 2015 |
| Crocodog Games Limited | Manufacturing | 2024 |
| Croft Pet Foods Limited | Wholesale & retail | 2010 |
| Cromwell Jones Limited | Real estate | 2022 |
| Cropredy Campers Limited | Administrative & support | 2025 |
| Cropredy Engineering Developments Ltd | Wholesale & retail | 2026 |
| Cropredy GUN Club Limited | Arts & recreation | 1998 |
| Cropredy Pharmacy Limited | Wholesale & retail | 2008 |
| Cross Deep Freeholders Limited | Households | 2008 |
| Cross Embroidery Limited | Manufacturing | 2002 |
| Crossfit Banbury Ltd | Arts & recreation | 2022 |
| Crossways Consulting Ltd | Professional & scientific | 2022 |
| Crouch ST Development Ltd | Real estate | 2016 |
| Crouch ST Investments Ltd | Real estate | 2022 |
| Crown Apartments Banbury Limited | Real estate | 2018 |