| CMS Industrial Services Limited | Manufacturing | 2015 |
| Coaching With Kindness CIC | Health & social care | 2026 |
| Coburn Law Limited | Professional & scientific | 2025 |
| Codecon Limited | Professional & scientific | 1973 |
| COL Properties Limited | Real estate | 2012 |
| Coleman Development Ltd | Real estate | 2020 |
| Columbus TEN Limited | Financial services | 2007 |
| Come Smile With ME Ltd | Health & social care | 2024 |
| Commercial Property Legal Consultant Ltd | Administrative & support | 2026 |
| Commitment to Property Ltd | Financial services | 2024 |
| Community Sports Coaching Limited | Arts & recreation | 2010 |
| Competent Cleaners Limited | Other services | 2000 |
| Complete Technical Solutions (CQV) Limited | Professional & scientific | 2020 |
| Compliance 4 Business Limited | Information & communication | 2016 |
| Concept Electrical UK Limited | Construction | 2009 |
| Concept R Consultants Ltd | Administrative & support | 2014 |
| Concilium North West Ltd | Other services | 2019 |
| Concordia Multi Academy Trust | Education | 2016 |
| Concordia Senior Care Limited | Health & social care | 2026 |
| Condrache Ltd | Transport & logistics | 2022 |
| Confetti Printing Ltd | Wholesale & retail | 2024 |
| Connection Solutions Limited | Energy | 2012 |
| Consort Heath Limited | Health & social care | 2024 |
| Constantin Dragos Danescu Limited | Transport & logistics | 2019 |
| Continental Leisure Projects Markets Limited | Arts & recreation | 2016 |
| Cook & Care Ltd | Hospitality | 2019 |
| Cook Compression Limited | Manufacturing | 1986 |
| Coolworld Rentals UK Limited | Manufacturing | 2017 |
| Cooper Corporate Investments Limited | Construction | 2019 |
| Cora’S Canine Clips Limited | Other services | 2021 |
| Cord Property Developments Limited | Administrative & support | 2011 |
| Core Contract Services Ltd | Administrative & support | 2024 |
| Corfield Engineering Solutions Limited | Construction | 2023 |
| Cortex Electrics Ltd | Construction | 2023 |
| Costello Dental Limited | Health & social care | 2024 |
| Coventry and Warwickshire Swim School LLP | | 2024 |
| Coworkz Ltd | Real estate | 2018 |
| CP Dental Training Limited | Education | 2016 |
| CP Home Lettings Limited | Real estate | 2026 |
| Crafty Dog 23 Ltd | Hospitality | 2023 |
| Crane Medical Care Limited | Health & social care | 2020 |
| Craven & Murray Opticians Limited | Wholesale & retail | 2013 |
| Creative Calm Training Limited | Arts & recreation | 2016 |
| Creative Management Consulting Limited | Professional & scientific | 2014 |
| Creator Classes Ltd | Education | 2020 |
| Crest Asbestos Services Ltd | Construction | 2023 |
| Crest Environmental Services Limited | Water & waste | 2000 |
| Crest Industrial Services (UK) Limited | Water & waste | 2015 |
| Crew Partners Ltd | Information & communication | 2023 |
| Cristian Garage Ltd | Wholesale & retail | 2024 |
| Crucial FX Limited | Professional & scientific | 2011 |
| Crxd Ltd | Information & communication | 2026 |
| CSF Properties Ltd | Real estate | 2025 |
| Cube ADL Holding Ltd | Financial services | 2026 |
| Cumberland Investment Partnership LLP | | 2014 |
| Cumberland Sports Village Limited | Arts & recreation | 2023 |
| Curzon Design and Energy Ltd | Construction | 2012 |
| Custodial Group Ltd | Information & communication | 2020 |
| Custom Joinery Cheshire Ltd | Construction | 2016 |
| Cute Puppies Ltd | Professional & scientific | 2025 |
| CVJ Design Ltd | Professional & scientific | 2020 |
| CW Gymnastics Ltd | Arts & recreation | 2026 |
| CW Security Ltd | Administrative & support | 2018 |
| Cybele Solutions Holdings Limited | Professional & scientific | 2011 |
| Cybele Solutions Limited | Financial services | 2010 |
| Cygnus Live Ltd | Arts & recreation | 2018 |
| D & B Barratt Ltd | Arts & recreation | 2021 |
| D & P Coatings Ltd | Construction | 2021 |
| D a Walklett Limited | Wholesale & retail | 2026 |
| D B Engineering Services Limited | Manufacturing | 2003 |
| D Baig Medical Ltd | Health & social care | 2025 |
| D Barnett Onlytans Limited | Wholesale & retail | 2025 |
| D Dent Ltd | Health & social care | 2020 |
| D Fittes Dental Ltd | Health & social care | 2024 |
| D Morris Ltd. | Hospitality | 2014 |
| D Quilliam Inspection Services Ltd | Professional & scientific | 2026 |
| D W Mcilroy (UK) Limited | Administrative & support | 2017 |
| D&B Tanker Services Limited | Transport & logistics | 2010 |
| D&D Facades Ltd | Construction | 2025 |
| D. Gregory Limited | Health & social care | 2009 |
| D. Morgan PLC | Construction | 1964 |
| D. Smith (Holdings) Limited | Financial services | 2005 |
| D.G.Components Limited | Manufacturing | 2010 |
| D.M. Hodgson Limited | Wholesale & retail | 2002 |
| D.Morgan Demolition Limited | Professional & scientific | 1983 |
| D3 Project Management Ltd | Professional & scientific | 2026 |
| Daes UK Holdings Limited | Financial services | 2026 |
| Dagrac UK Ltd | Financial services | 2020 |
| Daintith Ltd | Health & social care | 2025 |
| Dalcoem Limited | Information & communication | 2017 |
| Dane Piercy Event Entertainment Ltd | Arts & recreation | 2023 |
| Daniel Ball Dental Services Ltd | Health & social care | 2024 |
| Daniel Winston Ltd | Health & social care | 2012 |
| Danmont Ltd | Health & social care | 2025 |
| Danny Burns QS Ltd | Professional & scientific | 2018 |
| Danp Limited | Other services | 2022 |
| Dappa Dogs International Ltd | Wholesale & retail | 2024 |
| DARE2DREAM Mortgages and Financial Services Limited | Professional & scientific | 2021 |
| Data Veritas Limited | Information & communication | 2025 |
| Datatrac Limited | Information & communication | 2022 |