| Chiltern Construction Services Ltd | Construction | 2025 |
| Chiltern Edge Group Ltd | Wholesale & retail | 2020 |
| Chiltern Fire Risk Solutions Ltd | Public administration | 2026 |
| Chiltern Flooring Supplies Limited | Wholesale & retail | 2002 |
| Chiltern GP Chambers Limited | Administrative & support | 2016 |
| Chiltern Gymnastics Limited | Arts & recreation | 2023 |
| Chiltern Heating and GAS Services Ltd | Construction | 2015 |
| Chiltern Hills (HW) Limited | Real estate | 2014 |
| Chiltern Hills Limited | Real estate | 2009 |
| Chiltern Homes (Bucks) Limited | Construction | 2023 |
| Chiltern Hygiene Services Limited | Administrative & support | 2007 |
| Chiltern Land & Leasing Company Limited | Construction | 1982 |
| Chiltern Local Limited | Wholesale & retail | 2010 |
| Chiltern Medics Limited | Health & social care | 2019 |
| Chiltern Mortgage Services Limited | Construction | 2024 |
| Chiltern Mortgages Ltd | Financial services | 2024 |
| Chiltern Paving and Landscaping Limited | Construction | 2026 |
| Chiltern Property Group Ltd | Real estate | 2024 |
| Chiltern Property Management Ltd | Real estate | 2025 |
| Chiltern Property Search Ltd | Professional & scientific | 1996 |
| Chiltern Rangers CIC | Arts & recreation | 2012 |
| Chiltern Reach Office Supplies Ltd | Wholesale & retail | 2005 |
| Chiltern Real Estate Limited | Real estate | 2018 |
| Chiltern Recruitment Holdings Limited | Other services | 2019 |
| Chiltern Recruitment Limited | Administrative & support | 1988 |
| Chiltern Singers Limited | Education | 2023 |
| Chiltern Supply Chain Solutions Ltd | Professional & scientific | 2023 |
| Chiltern Support &Housing Ltd | Hospitality | 2008 |
| Chiltern Utility Solutions Ltd | Administrative & support | 2020 |
| Chilton Pump Solutions Limited | Other services | 2020 |
| Chimney Power Sweeping (Bucks) Ltd | Administrative & support | 2025 |
| Chimney Power Sweeping Ltd | Administrative & support | 2023 |
| China International Trading UK Ltd | Hospitality | 2018 |
| China Trade Expo Ltd | Manufacturing | 2024 |
| Chinnor Auto Repairs Limited | Wholesale & retail | 2019 |
| Chip Chop Building Ltd | Construction | 2022 |
| Chipsaway Cressex Limited | Wholesale & retail | 2003 |
| Chiron - Bujoli Ltd | Information & communication | 2022 |
| Chiswick Brass Festival C.I.C. | Education | 2025 |
| CHM Contracting Ltd. | Information & communication | 2017 |
| Chobham Manor LLP | | 2012 |
| Chobham Manor Property Management Limited | Real estate | 2015 |
| CHOCHO64 Ltd | Other services | 2016 |
| Chocofruit Trading Ltd | Wholesale & retail | 2021 |
| Chodrum Limited | Professional & scientific | 2022 |
| Chongmedicare Limited | Health & social care | 2026 |
| Chorlton Construction Services Ltd | Professional & scientific | 2006 |
| Choudhry Property Management Ltd | Real estate | 2025 |
| Chris Bates Financial Advice Limited | Professional & scientific | 2012 |
| Chris Moss & Associates Ltd | Extraterritorial | 2015 |
| Chrisco Productions Limited | Information & communication | 2017 |
| Christian Held Ltd | Information & communication | 2019 |
| Christmas Cottage Nursery Limited | Education | 2011 |
| Chromaq International Ltd | Professional & scientific | 2013 |
| Chromium Care Limited | Health & social care | 2021 |
| Chromium Ventures Ltd | Professional & scientific | 2024 |
| Chronically Creative Ltd | Wholesale & retail | 2025 |
| Chuckra Ltd | Information & communication | 2004 |
| Chunky (Worldwide) Ltd | Hospitality | 2017 |
| Church House Classics Limited | Wholesale & retail | 2018 |
| Churchside Residents Association (Holmer Green) Limited | Professional & scientific | 2018 |
| CI Furniture Ltd | Wholesale & retail | 2022 |
| Cibola Life Sciences Ltd | Professional & scientific | 2023 |
| Cielo Properties Limited | Real estate | 2023 |
| Cine Engine Ltd | Arts & recreation | 2025 |
| Cineark Ltd | Administrative & support | 2015 |
| Cinematic Pictures Limited | Information & communication | 2013 |
| Cinemotive Limited | Information & communication | 2016 |
| Cinetek Rentals Limited | Information & communication | 2018 |
| Cinevision Ltd | Information & communication | 2012 |
| Cipher Consultancy Limited | Information & communication | 2010 |
| Cippenham Table Tennis Centre Limited | Arts & recreation | 1995 |
| Cipricos Ltd | Transport & logistics | 2019 |
| Circa Removal Ltd | Water & waste | 2023 |
| Circl Limited | Wholesale & retail | 2024 |
| Cirrus (Aeropark) Management Limited | Real estate | 2006 |
| CIS Accountants Ltd | Professional & scientific | 2025 |
| Citadel Projit Limited | Information & communication | 2026 |
| Citimede Investments Limited | Information & communication | 2014 |
| City 2 City Electrical Ltd | Construction | 2023 |
| City Digital Technology Limited | Wholesale & retail | 1998 |
| City Drylining Limited | Construction | 2016 |
| City Farm Systems (China) Ltd | Professional & scientific | 2021 |
| City Farm Systems Limited | Professional & scientific | 2013 |
| City Farm Technologies Limited | Manufacturing | 2013 |
| City Fire Protection & Maintenance Services LLP | | 2007 |
| City Fire Protection Services Limited | Wholesale & retail | 2008 |
| City Food Store Ltd | Wholesale & retail | 2020 |
| City Meets Honey Interiors Limited | Wholesale & retail | 2023 |
| City of London Brokers Limited | Extraterritorial | 1982 |
| CITY2CITY Coaches Ltd | Transport & logistics | 2026 |
| Citytypes Limited | Financial services | 1984 |
| Citywide Cleaners Limited | Administrative & support | 2021 |
| Citywise Travel Ltd | Transport & logistics | 2016 |
| CJ Media Labs Limited | Professional & scientific | 2015 |
| CJC Engineering Services Ltd | Manufacturing | 2025 |
| CJM Properties (Stokenchurch) Limited | Real estate | 2021 |
| CJS Air Conditioning Ltd | Construction | 2020 |
| CJT Tech Ltd | Information & communication | 2021 |
| CKR Equipment Rental Ltd | Administrative & support | 2020 |