| Church Farm Kitchen Limited | Hospitality | 2026 |
| Ciba Brand Immobiliare Ltd | Financial services | 2021 |
| Ciba Brand Limited | Hospitality | 2019 |
| Ciba Wealth Ltd | Real estate | 2026 |
| Cibu Vending LLP | | 2024 |
| Cinderford Area Neighbourhood Development Initiative (C.A.N.D.I.) | Other services | 1996 |
| Cinderford Artspace | Education | 1991 |
| Cinderford Grill & Peri Peri Ltd | Hospitality | 2023 |
| Cinderford Indian Limited | Hospitality | 2024 |
| Cinderford MG Ltd | Wholesale & retail | 2018 |
| Cinderford MOT & Service Centre Ltd. | Wholesale & retail | 1998 |
| Cinderford Nails Ltd | Other services | 2021 |
| Cinderford Recycling Limited | Wholesale & retail | 2015 |
| Cinderford Rugby Football Club Limited | Arts & recreation | 2012 |
| Cinderford Self Storage Limited | Transport & logistics | 2026 |
| Cinderford ST John's Mews Management Limited | Households | 2015 |
| CK Build Ltd | Construction | 2025 |
| CK Properties (Bristol) Ltd | Construction | 2025 |
| Claina Palmer Designs Limited | Wholesale & retail | 2022 |
| Clays Farm Vintage Cider Ltd | Manufacturing | 2022 |
| Clean Ride Detailing Ltd | Administrative & support | 2025 |
| CMR Building Services Ltd | Construction | 2026 |
| Cnlandscapes Ltd | Administrative & support | 2021 |
| Codestore Limited | Administrative & support | 2024 |
| Collafield Construction Consultancy Ltd | Construction | 2020 |
| Collect-A-Pet Limited | Other services | 2009 |
| Cotswold & Country Ltd | Financial services | 2023 |
| Cotswold Mortgage Advice Centre Limited | Financial services | 2019 |
| Cotton Clouds Ltd | Manufacturing | 2008 |
| Country Coverings Ltd | Construction | 2024 |
| Court Farm Garage Limited | Wholesale & retail | 2016 |
| Courtfield Design Limited | Real estate | 2022 |
| Cowboy Barber Ltd | Other services | 2025 |
| Craft RHI Limited | Manufacturing | 2023 |
| Cranbury Wells Limited | Transport & logistics | 1982 |
| Creative Grapevine Limited | Arts & recreation | 2014 |
| Creative Wetlands Ltd | Construction | 2026 |
| Crfc Community Partnership CIC | Education | 2026 |
| Crome Creations Limited | Information & communication | 2012 |
| CSM Carpentry Ltd | Construction | 2017 |
| CTS Drains LLP | | 2026 |
| Cyindus Ltd | Information & communication | 2013 |
| D & H Packaging Limited | Arts & recreation | 2006 |
| D & S Installations (Laundry) Limited | Manufacturing | 2005 |
| D a Neale Ltd | Wholesale & retail | 2017 |
| D B Trading 0 Ltd | Wholesale & retail | 2022 |
| D E Asset Holdings LLP | | 2023 |
| D&H Commercials Ltd | Wholesale & retail | 2026 |
| D. & F. Coleman Limited | Transport & logistics | 1978 |
| Danconst Ltd | Construction | 2019 |
| Dann Property Services Ltd | Real estate | 2025 |
| David Marchio Consulting Limited | Professional & scientific | 2014 |
| Davis & Son's Gloucester Ltd | Transport & logistics | 2018 |
| Davis & Sons Transport Services Ltd | Transport & logistics | 2025 |
| Dean Forest Tech LLP | | 2023 |
| Dean Garage Doors Ltd | Construction | 2002 |
| Dean Heritage Museum Trust | Arts & recreation | 1985 |
| Dean Laser Clay Ltd | Arts & recreation | 2019 |
| Deliciously RAW Limited | Hospitality | 2012 |
| Delta Activities and Sports Ltd | Arts & recreation | 2022 |
| Delta Gymnastics Ltd | Arts & recreation | 2019 |
| Dentistree Aesthetics Ltd | Health & social care | 2019 |
| Deportes Y Ocio Limited | Administrative & support | 2022 |
| Derek W Hancox Limited | Administrative & support | 1996 |
| Deronne Limited | Construction | 1995 |
| Dillon Organic Ltd | Manufacturing | 2016 |
| DJ & Entertainment Services Limited | Arts & recreation | 2020 |
| DJA Consultants Ltd | Construction | 2011 |
| DJB Cleaning Supplies Limited | Administrative & support | 2007 |
| DMA Broadcast Ltd | Manufacturing | 2023 |
| Dock Solutions Limited | Manufacturing | 2004 |
| Dockright Regeneration Limited | Manufacturing | 2008 |
| Dojo Pictures Limited | Information & communication | 2023 |
| Drew Property Law Limited | Professional & scientific | 2023 |
| Drop the MOP Commercial Cleaning Ltd | Administrative & support | 2020 |
| DROP4U Ltd | Transport & logistics | 2025 |
| DS Forest Ltd | Hospitality | 2014 |
| DTL Contracting Ltd | Construction | 2024 |
| Duck Alignment Ltd | Information & communication | 2023 |
| DW Healthcare Ltd | Health & social care | 2011 |
| E a Carter Investments Limited | Real estate | 2017 |
| E B Services (Forest of Dean) Ltd | Wholesale & retail | 2026 |
| E1 Enterprises Ltd | Wholesale & retail | 2007 |
| Ecoheat Southwest Ltd | Construction | 2023 |
| Edginton Holdings Limited | Financial services | 2024 |
| Education International Services Limited | Hospitality | 1986 |
| EGM New Futures Ltd | Financial services | 2019 |
| Elami Utilities Limited | Construction | 2020 |
| Elderflower UK Estates Ltd | Construction | 2025 |
| Elevate Complete Property Services Ltd | Households | 2026 |
| Elevation Scaffolding Ltd | Construction | 2010 |
| Ellis S a J Limited | Wholesale & retail | 2018 |
| Elvn Holdings Ltd | Real estate | 2021 |
| Elvn Ltd | Administrative & support | 2021 |
| EM Network Services Limited | Information & communication | 2025 |
| Embling Design Ltd | Professional & scientific | 2024 |
| Emsop Commercial Limited | Transport & logistics | 2000 |
| Entrust Property and Services Ltd | Real estate | 2023 |
| Envisage Project Solutions Limited | Construction | 2009 |
| Eqops Ltd | Manufacturing | 2025 |