| Capital One Property Investments Limited | Financial services | 2023 |
| Capital One Property Management Ltd | Construction | 2025 |
| Capital One Property Partners Ltd | Construction | 2023 |
| Capital One Property Sourcing Ltd | Real estate | 2024 |
| Capital One Property Ventures Ltd | Real estate | 2025 |
| Capital Protect Limited | Financial services | 2004 |
| Capital Web Systems Ltd | Information & communication | 2026 |
| Capri Motors Limited | Wholesale & retail | 2007 |
| Capri Rise Limited | Wholesale & retail | 2024 |
| Capstone Building & Property Services Ltd | Professional & scientific | 2021 |
| Captain Flavours Limited | Hospitality | 2019 |
| Captainslocker Limited | Wholesale & retail | 2014 |
| Captansalar Ltd | Wholesale & retail | 2025 |
| Captivating Strategies Ltd | Professional & scientific | 2025 |
| Captrex Ltd | Professional & scientific | 2022 |
| Captum Capital Limited | Professional & scientific | 1997 |
| Car Accident Repair Service Limited | Wholesale & retail | 2003 |
| Car Accident Repairs Ltd | Wholesale & retail | 2018 |
| Car Concept Limited | Wholesale & retail | 2024 |
| Car Cosmetics Derby Limited | Wholesale & retail | 2006 |
| Car Electronics Derby Ltd | Wholesale & retail | 2011 |
| Car Scheme Limited | Wholesale & retail | 2012 |
| Car Select Ltd | Wholesale & retail | 2017 |
| Carapace Heart Services Limited | Health & social care | 2018 |
| Caravan & Motorhome Sales Limited | Administrative & support | 2007 |
| Carbon Catapult Limited | Professional & scientific | 2024 |
| Carbon Initiative Ltd | Professional & scientific | 2023 |
| Carbon Success Limited | Construction | 2013 |
| Carbot LLP | | 2018 |
| Carbury Investments Limited | Real estate | 1949 |
| Cardiac Measurements Limited | Health & social care | 2024 |
| Cardinalis Care Ltd | Health & social care | 2025 |
| Care Above Services Ltd | Health & social care | 2015 |
| Care Accountancy and Financial Services Limited | Professional & scientific | 2009 |
| Care and Education Community Interest Company | Administrative & support | 2018 |
| Care and Education Group Limited | Health & social care | 2019 |
| Care for Paul Limited | Health & social care | 2008 |
| Care Supply Derby Ltd | Health & social care | 2024 |
| Care Village Care Limited | Professional & scientific | 2019 |
| Care Wise Derby Ltd | Professional & scientific | 2019 |
| Care-Ni Ltd | Health & social care | 2020 |
| Carefirst Healthcare Ltd | Health & social care | 2025 |
| Careflux Limited | Health & social care | 2025 |
| CAREFORLIFE21 Limited | Health & social care | 2022 |
| Carelogicuk Limited | Administrative & support | 2023 |
| Caren Supreme Solutions and Services Limited | Information & communication | 2024 |
| CARERS4ALL Ltd | Public administration | 2023 |
| Cares & Repairs Limited | Construction | 2020 |
| Carewise Solutions Ltd | Other services | 2024 |
| Careys Prestige Valeting & Body Repairs Ltd | Administrative & support | 2010 |
| Cariad Babi Ltd | Wholesale & retail | 2019 |
| Caribbean Express Ltd | Hospitality | 2024 |
| Caribbean Spice Events Ltd | Administrative & support | 2025 |
| Caring Personnel Limited | Administrative & support | 2023 |
| Caring Places Limited | Health & social care | 2025 |
| Caritas Violins Limited | Wholesale & retail | 2019 |
| Carl Hall Transport Services Limited | Transport & logistics | 2014 |
| Carl Molloy Limited | Other services | 2003 |
| Carlisle Advisory Limited | Professional & scientific | 2026 |
| Carlton Travel Ltd | Transport & logistics | 2025 |
| Carman 4X4 Limited | Transport & logistics | 2023 |
| Carman Recovery Limited | Transport & logistics | 2026 |
| Carmen Engineering Ltd | Manufacturing | 2025 |
| Carmichael Collective Limited | Professional & scientific | 2018 |
| Carnall Holdings Ltd | Financial services | 2019 |
| Caroline & Sarah Travel Ltd | Administrative & support | 2019 |
| Caroline Care Limited | Health & social care | 2018 |
| Caroline Nall Curtains Limited | Manufacturing | 2002 |
| Caroline Pearson Limited | Financial services | 2015 |
| Caroline Transport Logistic Ltd | Transport & logistics | 2026 |
| Carpers Yard Ltd | Wholesale & retail | 2019 |
| Carpet Time (Derby) Limited | Wholesale & retail | 2002 |
| Carpets & Flooring Derbyshire Limited | Construction | 2025 |
| Carre Holdings Limited | Financial services | 2023 |
| Carrington Autocentre Ltd | Wholesale & retail | 2018 |
| Carrington Glass Limited | Construction | 1986 |
| Carrington Properties (Derby) Limited | Professional & scientific | 1986 |
| Cars of Essex Limited | Wholesale & retail | 2019 |
| Carshowco Ltd | Administrative & support | 2025 |
| CARSOURCE360 Limited | Wholesale & retail | 2020 |
| Cart Crew (Chesterfield) Limited | Hospitality | 2025 |
| Cart Splash Ltd | Wholesale & retail | 2026 |
| Carter Construction (Derby) Limited | Construction | 2007 |
| Carter Holdings Limited | Financial services | 2017 |
| Carter Sampson Ltd | Real estate | 2020 |
| Carter Sampson Sales Ltd | Real estate | 2024 |
| Carter Webb Limited | Construction | 2020 |
| Cartermarsh Limited | Health & social care | 2006 |
| Carterwill Limited | Hospitality | 2023 |
| Carty Property Portfolio Ltd | Real estate | 2024 |
| Carz 4 YOU Ltd | Wholesale & retail | 2019 |
| Casa Brava Investments Limited | Professional & scientific | 2024 |
| Casa Brava Properties Limited | Real estate | 2005 |
| Casa Clari Limited | Real estate | 2010 |
| Casa D’Avorio Ltd | Wholesale & retail | 2018 |
| Casa Nonno Ltd | Hospitality | 2026 |
| Casa Sicura Home Security Limited | Construction | 2025 |
| Casa Strada (Holdings) Limited | Professional & scientific | 2014 |
| Casa Strada Productions Ltd. | Arts & recreation | 2006 |
| Casa Strada Properties Limited | Real estate | 2015 |