| Carlyn Davie Medical Services Limited | Health & social care | 2025 |
| Carmichael (Scotia) Limited | Manufacturing | 2009 |
| Cashman & Co Limited | Information & communication | 2017 |
| CBR Solar Ltd | Construction | 2024 |
| CC Homecare Limited | Health & social care | 2022 |
| CDL (Edinburgh) Limited | Real estate | 2026 |
| Celid Investments Ltd | Real estate | 2022 |
| Centro Network Limited | Professional & scientific | 2024 |
| Cerberus Scaffolding Ltd | Construction | 2021 |
| Certifi Electrical Contractors Ltd | Construction | 2023 |
| Certus Facilities Services Ltd | Administrative & support | 2018 |
| Chai Counselling Ltd | Other services | 2019 |
| Change Fitness Limited | Professional & scientific | 2008 |
| Chapter One Hair Spa Limited | Other services | 2012 |
| Chapter One Properties Limited | Other services | 2024 |
| Charles Taylor Woodwork & Design Limited | Manufacturing | 1987 |
| Charleston Gore Limited | Professional & scientific | 2017 |
| Chattan Commercial Properties Limited | Real estate | 2019 |
| Chertsey Investments Ltd. | Real estate | 2005 |
| Chris Duffy Property (Edinburgh) Ltd | Other services | 2020 |
| Chris Keppie Painters & Decorators Ltd | Construction | 2026 |
| Chris Matson Limited | Professional & scientific | 2016 |
| Christie’S Exterior Cleaning Ltd | Construction | 2026 |
| Christina Gaiger Architects Limited | Professional & scientific | 2026 |
| Christopher Harding Creative Limited | Information & communication | 2015 |
| Ciemme Limited | Real estate | 2017 |
| City Centre Rooms (Edinburgh) Limited | Hospitality | 2013 |
| City Elite Travel Ltd | Transport & logistics | 2018 |
| Citysweep Limited | Construction | 2006 |
| CKF Consultancy Limited | Information & communication | 2016 |
| Clandom Limited | Real estate | 2023 |
| Cleanroom Skills Academy CIC | Education | 2026 |
| Cleata Limited | Information & communication | 2020 |
| Cloud 9 Installs Ltd | Professional & scientific | 2026 |
| CLOUD9CREPZ Ltd | Wholesale & retail | 2025 |
| CM Resources Ltd | Administrative & support | 2012 |
| Cm-Cr Group Ltd | Other services | 2024 |
| CMH Scarr Limited | Health & social care | 2015 |
| Cocoroco Communications Ltd | Professional & scientific | 2009 |
| Coffee Angel (Edinburgh) Ltd. | Hospitality | 2012 |
| Coldwells Art Company Limited | Other services | 2004 |
| Colin Cochrane & SON (Dalkeith) Limited | Construction | 1958 |
| Colquhoun Properties Limited | Real estate | 2020 |
| Comet Commercial Vehicles Limited | Transport & logistics | 2008 |
| Commercial Vehicle Advice Limited | Transport & logistics | 2023 |
| Common Sense Marketing Limited | Information & communication | 2018 |
| Complementary Properties Limited | Real estate | 1992 |
| Connectpro Ltd. | Professional & scientific | 2000 |
| Connolly's Services Ltd | Professional & scientific | 2026 |
| Connor FOX Recruitment Solutions Ltd | Administrative & support | 2019 |
| Consilium Sports Group Ltd | Professional & scientific | 2019 |
| Consumer Choice Financial Services Limited | Extraterritorial | 2020 |
| Coorie DUN Limited | Hospitality | 2019 |
| Copper Heating Limited | Construction | 2021 |
| Copy Pastd Ltd | Professional & scientific | 2023 |
| Corbie Consulting Limited | Professional & scientific | 2008 |
| Cordery Contracts Ltd | Construction | 2022 |
| Core Conservation Ltd | Construction | 2013 |
| Cortex Aerospace Ltd | Professional & scientific | 2024 |
| Counsellingnewhaven Ltd | Health & social care | 2026 |
| CP Business Solutions Ltd | Administrative & support | 2023 |
| CP Property Edinburgh Ltd | Other services | 2017 |
| CP Textile Ltd | Wholesale & retail | 2024 |
| Craig Bain Ltd | Administrative & support | 2023 |
| Craig Melrose Fabrications Ltd | Manufacturing | 2026 |
| Craigelachie Consulting Ltd | Professional & scientific | 2018 |
| Crawford Cleaning Ltd | Administrative & support | 2020 |
| Crawford Group East Ltd | Administrative & support | 2023 |
| Creativity UN- Limited | Professional & scientific | 2024 |
| Crest Apps Ltd | Information & communication | 2026 |
| Criminal Games Ltd | Information & communication | 2025 |
| CRM Investments Limited | Financial services | 2017 |
| Crossview Property Consultants Ltd | Real estate | 2016 |
| Crowe Plumbing & Heating Ltd | Construction | 2015 |
| Crustworx Ltd | Hospitality | 2023 |
| Crystal Property Edinburgh Ltd | Real estate | 2025 |
| Crystals Limited | Wholesale & retail | 2002 |
| CSC FM Services Ltd | Administrative & support | 2025 |
| CSQ Consult Ltd | Construction | 2012 |
| CTC Quality & Safety Limited | Construction | 2012 |
| Cuthberts of Edinburgh Limited | Construction | 2019 |
| Cutting Edge Psychology Ltd | Administrative & support | 2024 |
| CVC Solutions Ltd. | Other services | 2023 |
| CW Fireplaces Limited | Manufacturing | 2025 |
| Cybersphere Consulting Limited | Information & communication | 2025 |
| CYC Joinery and Garage Conversions Ltd | Construction | 2020 |
| Cyviz Limited | Professional & scientific | 2012 |
| D & J Commercial Property Limited | Real estate | 2021 |
| D & J Property Lettings Ltd | Real estate | 2017 |
| D Consilio (DC) Properties Limited | Real estate | 2021 |
| D H Property Services Ltd | Real estate | 2015 |
| D Harrison & SON (Joiners & Carpenters) Ltd | Manufacturing | 2020 |
| D Harrison and SON Developments Ltd | Construction | 2026 |
| D Napier Accountancy Ltd | Professional & scientific | 2017 |
| D&E Property Developments Ltd | Construction | 2025 |
| D&G Roofing Contracts Ltd | Construction | 2022 |
| D2 Architectural Design Ltd | Professional & scientific | 2010 |
| Daglish Investments Limited | Real estate | 2023 |
| Dahanberu Ltd | Real estate | 2020 |
| Dalgetty Holdings Limited | Real estate | 2024 |