| Coachouse Mews Management Company Limited | Households | 2005 |
| Coastal Bathroom Studio Ltd | Wholesale & retail | 2011 |
| Coastal Companions Ltd | Health & social care | 2021 |
| Coastal Finance Limited | Professional & scientific | 2013 |
| Coastal Group Holdings Ltd | Real estate | 2020 |
| Coastline Developments Limited | Real estate | 2017 |
| Cobblestones at Milton Management Company Limited | Households | 2015 |
| Cobblestones Court Limited | Households | 1997 |
| Cochrane Close Management Limited | Households | 1995 |
| Col-Tec (Solutions) Limited | Manufacturing | 2000 |
| College Fields Residents Company Limited | Households | 1999 |
| Collins & Butler Limited | Real estate | 2009 |
| Comet Air Limited | Administrative & support | 2016 |
| Compass Point (Southampton) Management Company Limited | Households | 2013 |
| Complete Lettings Ltd | Real estate | 2025 |
| Complisea Limited | Professional & scientific | 2025 |
| Concept (EA) Management Company Limited | Households | 2008 |
| Concept Fire Services Ltd | Public administration | 2020 |
| Concept Visuals Limited | Professional & scientific | 2011 |
| Connect 21 Community Limited | Households | 2007 |
| Connexions (Eastleigh) Management Company Limited | Households | 2010 |
| Conrad Marketing Limited | Professional & scientific | 2021 |
| Constable Grange (Colchester) Management Company Limited | Households | 2017 |
| Consummate Project Consultants Limited | Professional & scientific | 2010 |
| Contained Cycles Ltd | Wholesale & retail | 2022 |
| Context (High Wycombe) Management Company Limited | Households | 2007 |
| Convolve Consulting Ltd | Professional & scientific | 2020 |
| Conway Court (New Milton) Management Limited | Households | 1969 |
| Coopers Edge (NO 4) Management Company Limited | Households | 2013 |
| Coopers Edge (NO.3) Management Company Limited | Households | 2013 |
| Coopers Edge (Parcel 23) Management Company Limited | Households | 2014 |
| Copeland Park (Phase 3) Management Company Limited | Households | 2005 |
| Copeland Park Management Company Limited | Households | 2003 |
| Copenhagen Wharf Management Company Limited | Professional & scientific | 2016 |
| Coppermead Services Ltd | Other services | 2016 |
| Coppice Place Management Company Limited | Households | 2019 |
| Copthorne Residents Association Limited | Households | 2005 |
| Corinne Ellison Consulting Ltd | Professional & scientific | 2025 |
| Cornerways Flat Management Company Limited | Households | 1985 |
| Cornwallis Flats Limited | Households | 1961 |
| COS99 Limited | Real estate | 2022 |
| Coso Ltd | Construction | 2024 |
| Cost Empirical Limited | Professional & scientific | 2024 |
| Cotford Green (Taunton) Management Company Limited | Households | 2005 |
| Cotswold Vale (Long Marston) Management Company Limited | Households | 2018 |
| Cottage Ices Limited | Wholesale & retail | 2012 |
| Cotterstock Meadows (Oundle) Managing Company Limited | Households | 2022 |
| Cottonfields, Gibfield Management Company Limited | Households | 2016 |
| Country Sporting Experience Limited | Real estate | 2015 |
| Court Laurels Management Limited | Real estate | 2009 |
| Coverdale Paignton Management Company Limited | Households | 2017 |
| Cowhides of Brazil Ltd | Hospitality | 2024 |
| Cranbourne Gardens Management Company Limited | Households | 2002 |
| Cranbrook Walk Management Company Limited | Households | 2007 |
| Crawshay Bailey Close Limited | Households | 2016 |
| Crazy Bags Limited | Extraterritorial | 2005 |
| Crazy Horses Limited | Administrative & support | 2000 |
| Creek House Estate Limited | Real estate | 2021 |
| Crescent Mansions (Exeter) Limited | Households | 1983 |
| Cricketers Green (Torquay) Limited | Households | 2006 |
| Croft Gardens (Spencers Wood) Management Company Limited | Households | 2015 |
| Cromwell Place (Little Dunmow) Residents Management Company Limited | Households | 2016 |
| Crossmead House Limited | Households | 1985 |
| Crosswordsite.Com Limited | Information & communication | 2000 |
| Crown Park (Chester) Management Limited | Households | 2012 |
| Crownwood Park Management Company Limited | Households | 1999 |
| CT Consultants Ltd | Professional & scientific | 2023 |
| Cuidarcomamor Ltd | Health & social care | 2024 |
| Cullompton Management Limited | Real estate | 2011 |
| Curtis Commercials Ltd | Wholesale & retail | 2017 |
| Custom Motor Tune Ltd | Wholesale & retail | 2018 |
| Cwrt-Yr-Ysgol Management Company Limited | Households | 2010 |
| CYBERTECH2076 Limited | Manufacturing | 2025 |
| Cyprus Gardens Management Company Limited | Households | 2009 |
| D B Clinical Services Limited | Health & social care | 2022 |
| D H Consulting Limited | Professional & scientific | 1996 |
| Dacres Wood Court Management Company Limited | Households | 2021 |
| Dalifermat Ltd | Information & communication | 2015 |
| Dana's Aquatic Academy Leisure Ltd | Education | 2023 |
| Danes Park (New Milton) Management Company Limited | Households | 2025 |
| Danestream Farm Shop Limited | Hospitality | 2015 |
| Daniel D Butler Limited | Professional & scientific | 2012 |
| Dansland Limited | Professional & scientific | 2005 |
| Daracombe Gardens Management Company Limited | Households | 2013 |
| Daracombe Park Management Company Limited | Households | 2009 |
| Darm Properties Ltd | Real estate | 2023 |
| Darwin Court (Torquay) Limited | Households | 2010 |
| Datasouth UK Limited | Information & communication | 1998 |
| David Taylor Electrical Contractors and Services Limited | Manufacturing | 2012 |
| Dayworth Mews Management Company Limited | Real estate | 2007 |
| DE Havilland Orchard Residents Management Company Limited | Real estate | 2016 |
| DE Montfort Place Management Company Limited | Administrative & support | 2016 |
| Dean's LEA Management Company Limited | Households | 2006 |
| Decoleco Ltd | Transport & logistics | 2026 |
| Decor Lite Ltd | Manufacturing | 2019 |
| Deemrose Limited | Information & communication | 1983 |
| Demeter Property Limited | Real estate | 2012 |
| Derryhill House Management Company Limited | Households | 2025 |
| DES Electrical Services Ltd | Construction | 2018 |
| DFC Construction and Landscaping Ltd | Construction | 2019 |