| Cdmc Properties Ltd | Real estate | 2018 |
| Cecily Developments Limited | Real estate | 2020 |
| Central City Media Ltd | Information & communication | 2014 |
| Centrical Global Limited | Professional & scientific | 2009 |
| Centurians Gate Management Company Limited | Households | 2000 |
| Cerney Cheese Limited | Manufacturing | 2016 |
| Cerney House Limited | Real estate | 2016 |
| Cerney Motor Services Limited | Wholesale & retail | 2011 |
| Cerney's Crown Limited | Hospitality | 2023 |
| CET Enterprises Ltd | Arts & recreation | 2012 |
| Ceylon Cinnamon (Cirencester) Limited | Wholesale & retail | 2022 |
| CF (Cirencester) Limited | Real estate | 2004 |
| CFD 3 Limited | Professional & scientific | 2025 |
| CGA Financial & Investment Services Limited | Financial services | 1991 |
| CGM Search Limited | Professional & scientific | 2026 |
| Chairmans Network Limited | Other services | 2008 |
| Challenge Social Ltd | Information & communication | 2019 |
| Chambers Psychiatric Services Limited | Health & social care | 2002 |
| Change, Grow, Thrive LLP | | 2023 |
| Chantel Elshout Design Consultancy Limited | Wholesale & retail | 2011 |
| Chapter C Limited | Professional & scientific | 2000 |
| Charge Point Limited | Manufacturing | 2015 |
| Charity Point Ltd | Wholesale & retail | 2022 |
| Charles Dickins Holdings Limited | Financial services | 1996 |
| Charles Dickins Limited | Financial services | 1923 |
| Charles Harding Lettings (North) Ltd | Real estate | 2011 |
| Charlie Bettinson Photography Ltd | Professional & scientific | 2023 |
| Charlotte Holland Hairdressing Limited | Other services | 2024 |
| Charlton Lane Estates Limited | Real estate | 2020 |
| Charlton Recruitment (UK) Limited | Administrative & support | 2014 |
| Charm PR Limited | Administrative & support | 2003 |
| Checkmates Designs Ltd | Wholesale & retail | 2022 |
| Cheeky Swine Events Limited | Hospitality | 2025 |
| Cheers Ltd | Hospitality | 2018 |
| Chefs OS Ltd | Administrative & support | 2017 |
| Cheltenham News Ltd | Wholesale & retail | 2011 |
| Cheltenham Trade Commercials Limited | Wholesale & retail | 2025 |
| Cherry Lakes Limited | Agriculture & fishing | 2011 |
| Chese Stores Ltd | Wholesale & retail | 2025 |
| Chesterton Estates Limited | Real estate | 2018 |
| CHH Associates Ltd | Administrative & support | 2010 |
| CHH Management Limited | Households | 2007 |
| Chica Senora Ltd | Hospitality | 2025 |
| Chicp Limited | Hospitality | 2015 |
| Chip 4736 Limited | Manufacturing | 1992 |
| Choice Controls Limited | Administrative & support | 2004 |
| Chris Bruton Limited | Construction | 2002 |
| Chris Rodgers Consulting Limited | Professional & scientific | 1998 |
| Christian Mobey Limited | Manufacturing | 2001 |
| Christopher Stanley Architecture & Planning Ltd. | Professional & scientific | 1999 |
| Churchford Limited | Real estate | 2021 |
| Churn Construction Ltd | Construction | 2025 |
| Chutney B Limited | Professional & scientific | 2010 |
| CIA Fire & Security Limited | Administrative & support | 2008 |
| Circl Learning Ltd | Education | 2018 |
| Ciren Business Launch Support CIC | Administrative & support | 2020 |
| Ciren Convenience Store Ltd | Wholesale & retail | 2019 |
| Ciren Eats Limited | Wholesale & retail | 2020 |
| Ciren Technology Limited | Information & communication | 2022 |
| Cirencester Antiques Centre Limited | Wholesale & retail | 2012 |
| Cirencester Automation Solutions Ltd | Professional & scientific | 2011 |
| Cirencester Barber Shop Ltd | Other services | 2022 |
| Cirencester Bike Drop C.I.C. | Wholesale & retail | 2024 |
| Cirencester Bowling Club Limited | Arts & recreation | 1983 |
| Cirencester Brewery Ltd | Manufacturing | 2011 |
| Cirencester Carpet Centre Limited | Wholesale & retail | 2003 |
| Cirencester Cobbler Limited | Other services | 2024 |
| Cirencester Cohousing Limited | Construction | 2018 |
| Cirencester Computer Repairs Ltd | Wholesale & retail | 2011 |
| Cirencester Computers Limited | Extraterritorial | 2005 |
| Cirencester Fabrication Services Limited | Manufacturing | 2009 |
| Cirencester Friendly Membership Rewards Limited | Financial services | 2017 |
| Cirencester Furniture Project C.I.C. | Wholesale & retail | 2024 |
| Cirencester Garden Maintenance Limited | Administrative & support | 2023 |
| Cirencester Golf Club Limited | Arts & recreation | 1915 |
| Cirencester Housing for Young People | Real estate | 2021 |
| Cirencester Kids Stuff C.I.C. | Wholesale & retail | 2024 |
| Cirencester Kingshill School | Education | 2011 |
| Cirencester Light Opera Limited | Arts & recreation | 1999 |
| Cirencester Ltd | Financial services | 2024 |
| Cirencester Mortgage Co Limited | Financial services | 2015 |
| Cirencester Music Academy Ltd | Wholesale & retail | 2025 |
| Cirencester Open Air Swimming Pool Ltd | Arts & recreation | 2015 |
| Cirencester Opportunity Group Limited | Education | 2014 |
| Cirencester Park Farms Limited | Agriculture & fishing | 1962 |
| Cirencester Park Polo Club | Arts & recreation | 2007 |
| Cirencester Radio Limited | Information & communication | 2014 |
| Cirencester Sales & Lettings Limited | Real estate | 2017 |
| Cirencester Smiles Limited | Health & social care | 2022 |
| Cirencester Tyre & Exhaust Centre Limited | Wholesale & retail | 2005 |
| Cirencester Vape Co Ltd | Wholesale & retail | 2016 |
| Cirencester VW Specialists Ltd | Wholesale & retail | 2017 |
| Cirencester Wood Finishing Limited | Manufacturing | 2017 |
| Cirenium Limited | Information & communication | 2025 |
| Cirrus Insights Ltd | Information & communication | 2024 |
| Citrus Compliance Ltd | Financial services | 2022 |
| Citrus Funding Limited | Financial services | 2017 |
| City Bank Road (Residents) Limited | Households | 2006 |
| City Management Limited | Households | 2024 |
| Civic Intelligence Academy Ltd | Information & communication | 2024 |