| Chameleon Personnel Services Limited | Administrative & support | 2003 |
| Champ Developments Limited | Construction | 2024 |
| Chance Fashion & Co Ltd | Wholesale & retail | 2019 |
| Chancery Barr Financial Services Limited | Financial services | 1994 |
| Change Fusion Consulting Ltd | Professional & scientific | 2023 |
| Change Health Solutions Limited | Health & social care | 2010 |
| Change Insights Consultancy Ltd | Professional & scientific | 2020 |
| Change Views Limited | Professional & scientific | 2014 |
| Changeindex Limited | Households | 1990 |
| Chanmuk Limited | Real estate | 2018 |
| Channel Catalyst Limited | Professional & scientific | 2026 |
| Chaos City Comics & Empire Records Limited | Wholesale & retail | 2019 |
| Chaosiq Limited | Information & communication | 2018 |
| Chapman Property Investment and Lettings Ltd | Real estate | 2024 |
| Chapter 2 Media Ltd | Professional & scientific | 2020 |
| Charis Financials Ltd | Information & communication | 2017 |
| Charland Homes Limited | Construction | 2015 |
| Charles Edwards Heritage Limited | Wholesale & retail | 2021 |
| Charles Perry EOT Limited | Extraterritorial | 2022 |
| Charlie Mornin Ltd | Wholesale & retail | 2018 |
| Charlie White Limited | Extraterritorial | 2013 |
| Charlie's Trout Limited | Wholesale & retail | 2016 |
| Charlie’S Smokehouse Ltd | Manufacturing | 2021 |
| Charlotte Close Management Limited | Real estate | 1999 |
| Charndon DCL Ltd | Real estate | 2016 |
| CHARNDON(15)DCL Ltd | Real estate | 2016 |
| Chartergroup Alliance Ltd | Professional & scientific | 2019 |
| Chartman Holdings Limited | Financial services | 2015 |
| Chartridge Logistics Ltd | Transport & logistics | 2014 |
| Chartwood Consulting Limited | Information & communication | 2019 |
| Charville Management Limited | Households | 1985 |
| Chase Angels Ltd | Wholesale & retail | 2020 |
| Chasholl Management Company Ltd | Real estate | 2009 |
| Chassay Studio Limited | Professional & scientific | 2011 |
| Chaulden Practice Limited | Health & social care | 2025 |
| CHD Construction Services Limited | Extraterritorial | 2002 |
| Checkback International Group T/A Vetting Solutions Centre Ltd | Administrative & support | 2014 |
| Checkout Clean Limited | Households | 2014 |
| Checksplease Limited | Administrative & support | 2008 |
| Cheddington Developments Limited | Construction | 2019 |
| Cheery Homes Ltd | Real estate | 2019 |
| Cheerz Express Limited | Hospitality | 2016 |
| Chef Danny Lucas Ltd | Hospitality | 2024 |
| Chef Express Grill Limited | Hospitality | 2022 |
| Chelsea Denholm Therapy Ltd | Health & social care | 2021 |
| Chelsea Well Women Ltd | Health & social care | 2012 |
| Chelsham Consulting Limited | Professional & scientific | 2013 |
| Chembio Ltd | Professional & scientific | 2008 |
| Chemical & General Trading Limited | Real estate | 1992 |
| Cheongdam Ltd | Hospitality | 2022 |
| Chequer Rooms Limited | Health & social care | 2025 |
| Chequers Sandwich Bars Limited | Hospitality | 2000 |
| Cherry Nails Spa Ltd | Other services | 2025 |
| Cherry Tree Property Solutions Ltd | Real estate | 2023 |
| Chess Valley Anglers Limited | Agriculture & fishing | 2000 |
| Chesterheath Property Limited | Construction | 2000 |
| Cheval Noir Capital Limited | Financial services | 2025 |
| Chiamh Properties Ltd | Real estate | 2025 |
| Chiappecreative Limited | Professional & scientific | 2019 |
| Chic Services Ltd | Professional & scientific | 2022 |
| Chickenlicious Limited | Hospitality | 2016 |
| Chiffon Limited | Arts & recreation | 2023 |
| Chikkizza(St Albans) Limited | Hospitality | 2018 |
| Child Profiles Ltd | Health & social care | 2016 |
| Children First Leadership Ltd | Professional & scientific | 2025 |
| Chill@Chillies Ltd | Hospitality | 2023 |
| Chinsky & Co Ltd | Construction | 2019 |
| Chipizza Limited | Hospitality | 2024 |
| Chiswell Catering Ltd | Hospitality | 2021 |
| Chivenor Place Limited | Real estate | 2015 |
| Chris Bramwell Associates Limited | Administrative & support | 2007 |
| Chris Cross Limited | Real estate | 2021 |
| Chris Gomez Rugby Ltd | Education | 2013 |
| Chris Oladogba Limited | Information & communication | 2017 |
| Chrissie Hiller Coaching Ltd | Other services | 2021 |
| Christeven Consultancy Ltd | Professional & scientific | 2012 |
| Christian Construct Ltd | Manufacturing | 2020 |
| Christie Alexandra Limited | Extraterritorial | 2020 |
| Christine Parker - Medical Imaging Consultancy Ltd | Professional & scientific | 2024 |
| Christopher Baker-Pigram Limited | Financial services | 2023 |
| Christopher Wharton & Sons Limited | Manufacturing | 1993 |
| Christopher Wharton Goldsmith Limited | Wholesale & retail | 2000 |
| Chudleigh Estates Limited | Construction | 1936 |
| Church View Property 2023 Limited | Real estate | 2023 |
| Church View Property Limited | Real estate | 2018 |
| Churchill Inventories Ltd | Information & communication | 2019 |
| Churchill Lettings Ltd | Real estate | 2014 |
| Churchill Roofing & Builders Ltd | Construction | 2026 |
| Churchill's Estates Limited | Real estate | 2018 |
| Ciao Bella Holdings Limited | Professional & scientific | 2003 |
| Ciao Bella Property Limited | Real estate | 2015 |
| Ciao Bella Restaurant Limited | Hospitality | 1999 |
| Cimcon Software (UK) Limited | Information & communication | 2016 |
| Cinema Agency Limited | Professional & scientific | 2023 |
| Circuit ST Albans Ltd | Arts & recreation | 2022 |
| Circuit Supplies (UK) Limited | Wholesale & retail | 1993 |
| Cism Research Ltd | Professional & scientific | 2018 |
| CIT Consulting Ltd | Information & communication | 2016 |
| City Grey Capital Limited | Extraterritorial | 2023 |
| City Grey Group Limited | Extraterritorial | 2023 |