| Collins Heritage Ltd | Real estate | 2026 |
| Collins L Limited | Wholesale & retail | 2022 |
| Collins Marketing LLP | | 2021 |
| Collins Mechanical Services Ltd | Construction | 2008 |
| Comap Control Holdings Limited | Financial services | 2019 |
| Comap Control Limited | Wholesale & retail | 2019 |
| Comfy Haven Ltd | Wholesale & retail | 2025 |
| Comida Management Limited | Construction | 2015 |
| Common Sense Britain Ltd | Other services | 2025 |
| Compliance and Locum Solutions Ltd | Health & social care | 2022 |
| Concept Facade Systems Ltd | Manufacturing | 2019 |
| Concept Housing Association CIC | Real estate | 2008 |
| Concept Illustrated Services Limited | Transport & logistics | 2025 |
| Concept Stainless Limited | Wholesale & retail | 1990 |
| Concrete Flooring Network Limited | Construction | 2012 |
| Connect Social Care Ltd | Health & social care | 2022 |
| Connelly C SOT Limited | Wholesale & retail | 2000 |
| Consolidated Bearings & Seals Limited | Professional & scientific | 1987 |
| Contador Consulting Limited | Professional & scientific | 2026 |
| Content Inc Limited | Administrative & support | 2014 |
| Continental Food 2023 Limited | Hospitality | 2014 |
| Conway Safety Solutions Ltd | Financial services | 2024 |
| Cookseystradingcompany Ltd | Wholesale & retail | 2023 |
| Cooper Paul 1265 Limited | Transport & logistics | 2014 |
| Coopers Way Limited | Hospitality | 2019 |
| Copper Legal Consulting Limited | Administrative & support | 2019 |
| Coral Healthcare Ltd | Health & social care | 2024 |
| Coreguard Limited | Wholesale & retail | 2019 |
| Corelink Distribution Ltd | Transport & logistics | 2025 |
| Cornelius Investment Services Limited | Financial services | 2021 |
| Corrbabs Limited | Wholesale & retail | 2022 |
| Corro Trans Ltd | Transport & logistics | 2021 |
| Cosmetic Consulting Company Limited | Wholesale & retail | 2019 |
| Cosmodigix Limited | Wholesale & retail | 2024 |
| Costinel Ayan Dumitru Limited | Transport & logistics | 2026 |
| Cotraco Ltd | Wholesale & retail | 2024 |
| Court House (Malvern) Limited | Health & social care | 2021 |
| Cousins Furniture Stores Limited | Wholesale & retail | 1983 |
| Coziness Properties Ltd | Real estate | 2025 |
| CP Sandwell Limited | Hospitality | 2019 |
| CPC Techno Solutions Limited | Information & communication | 2021 |
| CPC Training Consultants Ltd | Professional & scientific | 2010 |
| CPH Property Group Ltd | Construction | 2026 |
| Cpns Limited | Real estate | 2000 |
| Crafted Inspiration Limited | Professional & scientific | 2017 |
| Crawford Technology Consulting Ltd | Information & communication | 2024 |
| Crayon Car Company Ltd | Wholesale & retail | 2017 |
| CRE (W.Mids) Limited | Real estate | 1969 |
| CRE (Walsall) Limited | Real estate | 2016 |
| CRE8 Sales Solutions Limited | Administrative & support | 2013 |
| Cream and Crumbs Ltd | Manufacturing | 2026 |
| Creamos Services Limited | Transport & logistics | 2025 |
| Creative Design & Printing Ltd | Manufacturing | 2022 |
| Creative Eden Ltd | Information & communication | 2018 |
| Cresstar ( Enterprises) Limited | Manufacturing | 2005 |
| Crete Floor Limited | Construction | 2017 |
| Crewnest Recruitment Ltd | Administrative & support | 2025 |
| Crispy COD Ltd | Hospitality | 2024 |
| Crispy Crust Ltd | Hospitality | 2024 |
| Cristian Muja Ltd | Transport & logistics | 2025 |
| Crossroad Logistics Limited | Transport & logistics | 2026 |
| Crown Barbers Club Ltd | Other services | 2020 |
| Crown International College London Ltd | Education | 2020 |
| Crown Screw Holdings Limited | Wholesale & retail | 2024 |
| Crown Screw Limited | Wholesale & retail | 2005 |
| CRP Acquisitions Limited | Professional & scientific | 2018 |
| Cryotherapy Midlands Ltd | Other services | 2015 |
| Crysh Ltd | Transport & logistics | 2024 |
| Cscm Limited | Information & communication | 2000 |
| CSK Property Group Ltd | Real estate | 2021 |
| CSK Support 24 Ltd | Health & social care | 2013 |
| Cuddles and Snuggles Limited | Manufacturing | 2026 |
| CUI - Count US in Limited | Education | 2021 |
| Cullen's Investments Limited | Financial services | 2019 |
| Cullen's Residential Investments Limited | Real estate | 2026 |
| Cullis T Limited | Wholesale & retail | 2015 |
| Cumbrian Developments Ltd | Construction | 2024 |
| Curative Ltd | Real estate | 2011 |
| Currall Lewis & Martin (Construction) Limited | Construction | 2000 |
| Cutek Ltd | Wholesale & retail | 2024 |
| Cuxson Gerrard Employees Trustees Limited | Professional & scientific | 2026 |
| CV Merchant Limited | Wholesale & retail | 2021 |
| Cxcentricity Ltd | Professional & scientific | 2022 |
| Cymrlogic Services Limited | Information & communication | 2026 |
| D Benson Property Ltd | Real estate | 2026 |
| D C Financial Midlands Limited | Financial services | 2010 |
| D Hamilton Traffics Ltd | Construction | 2025 |
| D Nails & Spa Ltd | Other services | 2024 |
| D Pitts Ltd | Construction | 2026 |
| D&B Exotic African Coffees Ltd | Wholesale & retail | 2018 |
| D&G Courier Logistics Ltd | Transport & logistics | 2024 |
| D&J Properties (Rugby) Limited | Real estate | 2020 |
| D'Cocina Birmingham Ltd | Hospitality | 2025 |
| D.F. Logistics Solutions Limited | Transport & logistics | 2003 |
| D.O Corporation Limited | Wholesale & retail | 2026 |
| Daily Haul Ltd | Transport & logistics | 2008 |
| Dainelis Ltd | Wholesale & retail | 2024 |
| Dakem International Limited | Wholesale & retail | 2024 |
| Dalhar Properties Ltd | Real estate | 2017 |
| DAN Insulation Ltd | Construction | 2025 |