| Chimes Coffee Shop Community Interest Company | Hospitality | 2015 |
| China Palace (Crowland) Limited | Hospitality | 2023 |
| Chinese Community in Peterborough C.I.C. | Health & social care | 2024 |
| Chinora Ltd | Health & social care | 2020 |
| Chipbay Limited | Wholesale & retail | 2015 |
| Chips for Chicks Ltd | Wholesale & retail | 2021 |
| Chisenhale Consulting Limited | Extraterritorial | 2004 |
| Chiswick Architectural Limited | Professional & scientific | 2019 |
| Chivenor Residents Company Limited | Households | 2003 |
| Chizah Limited | Health & social care | 2023 |
| Chjh Limited | Health & social care | 2008 |
| Chloe Brassey Consulting Ltd | Administrative & support | 2026 |
| Chnar Investments Ltd | Real estate | 2024 |
| Choice Abode Limited | Health & social care | 2026 |
| Choice Publishing Limited | Information & communication | 2002 |
| Choice Recruitment Limited | Administrative & support | 1996 |
| Choices Care Ltd | Administrative & support | 2011 |
| Choices Glazing Solutions Limited | Wholesale & retail | 2013 |
| Cholmeley Farms Limited | Agriculture & fishing | 1953 |
| Cholswell Road (Abingdon) Residents Company Limited | Other services | 2022 |
| Cholyk Trans Ltd | Transport & logistics | 2016 |
| Chopsclub Limited | Hospitality | 2025 |
| Chosen Creations Limited | Manufacturing | 2024 |
| Chris Brooks Carpentry Limited | Administrative & support | 2013 |
| Chris Clay Courier Services Limited | Transport & logistics | 2015 |
| Chris Dodson Thatching Services Limited | Construction | 2013 |
| Chris Groome Decorating Limited | Construction | 2013 |
| Chris Hawk Services Limited | Construction | 2013 |
| Chris Kohter Mechanical Services Ltd. | Professional & scientific | 2014 |
| Chris POL Ltd | Transport & logistics | 2014 |
| Chris Rezina Ltd | Wholesale & retail | 2017 |
| Chris Rowley Properties Limited | Real estate | 2017 |
| Chris Searle Roofing Ltd | Construction | 2020 |
| Chris TOD Consulting Ltd | Information & communication | 2024 |
| Chris Wallis Consultancy Limited | Professional & scientific | 2012 |
| Chrisan Limited | Health & social care | 2006 |
| Chrismachuks Ltd | Health & social care | 2025 |
| Christina Theo Ltd | Health & social care | 2022 |
| Christine Graham Consultancy Limited | Professional & scientific | 2010 |
| Christopher R Bustance Ltd | Wholesale & retail | 2021 |
| Chrolush Holdings Ltd | Real estate | 2025 |
| Chromasports Limited | Arts & recreation | 2024 |
| Chrome Health Ltd | Health & social care | 2026 |
| Chronicle 21 Limited | Information & communication | 2000 |
| Chrysalis Group Limited | Administrative & support | 2018 |
| Church Crookham Residents Company Limited | Households | 2005 |
| Church Hill Developments Stamford Ltd | Wholesale & retail | 2003 |
| Church Road Flats Limited | Households | 2016 |
| Church View Norton Canon Management Company Limited | Households | 2020 |
| Churches Together in Central Peterborough | Other services | 2011 |
| CIA Detailing Limited | Wholesale & retail | 2021 |
| Ciao Bella Ltd | Wholesale & retail | 2018 |
| Ciao RMK Ltd | Other services | 2015 |
| Cicm (Services) Limited | Education | 1992 |
| CIE Technical Services Limited | Professional & scientific | 2023 |
| Cinderella Excellent Cleaning Ltd | Professional & scientific | 2023 |
| Cine-Sister C.I.C. | Information & communication | 2019 |
| Cinemartini Films Ltd | Arts & recreation | 2023 |
| CIP Driving Ltd | Transport & logistics | 2024 |
| Cipher Consulting Group Ltd | Information & communication | 2024 |
| Cipher Security Services Ltd | Administrative & support | 2024 |
| Ciprus Limited | Health & social care | 2021 |
| Cips Africa Ltd | Other services | 2015 |
| Cips Corporate Services Limited | Wholesale & retail | 1991 |
| Circlefire Electrical Ltd. | Public administration | 2009 |
| Circular Solution Labs Limited | Manufacturing | 2026 |
| Circus Promotions Ltd | Arts & recreation | 1998 |
| Cirrus Blue Limited | Information & communication | 2016 |
| Cirrus Connect Internet Ltd | Information & communication | 2026 |
| Citadel Accountancy Limited | Professional & scientific | 2025 |
| Citadel Property Investments Limited | Real estate | 2022 |
| Citadel Short Term Let's Limited | Hospitality | 2022 |
| Citi Tyres Limited | Wholesale & retail | 2016 |
| Citi Tyres Wholesalers Ltd | Wholesale & retail | 2016 |
| City & County (UK) Limited | Real estate | 2008 |
| City Accountants and Tax Consultants Limited | Professional & scientific | 2017 |
| City Barber Peterborough Ltd | Other services | 2023 |
| City Blinds MK Ltd | Other services | 2025 |
| City Books Ltd | Professional & scientific | 2020 |
| City Build Investments Ltd | Hospitality | 2017 |
| City Build Stays Ltd | Real estate | 2022 |
| City Builders (UK) Ltd. | Construction | 2013 |
| City Cabs Pboro Limited | Transport & logistics | 2015 |
| City College Peterborough Foundation | Education | 2013 |
| City Entertainment Limited | Arts & recreation | 2016 |
| City Group Recruitment Limited | Administrative & support | 2020 |
| City Housing PE Ltd | Real estate | 2020 |
| City Keys Ltd | Real estate | 2024 |
| City Life Property Management Ltd | Real estate | 2015 |
| City Link Cars Ltd | Transport & logistics | 2022 |
| City Mechanics (Cambs) Limited | Wholesale & retail | 2024 |
| City Motors (Cambs) Limited | Wholesale & retail | 2015 |
| City Painters Ltd | Wholesale & retail | 2023 |
| City Resource Limited | Administrative & support | 2008 |
| City Resource Recruitment Limited | Administrative & support | 2024 |
| City Suites & Retreats Ltd | Hospitality | 2025 |
| City Tea Ltd | Wholesale & retail | 2015 |
| City Tyres (Peterborough) Ltd | Wholesale & retail | 2023 |
| Cityfleet Transport Ltd | Transport & logistics | 2026 |
| Citygate Chambers Limited | Professional & scientific | 2016 |