| Clydebuilt Holdings Limited | Professional & scientific | 2017 |
| Clydeco Limited | Professional & scientific | 2012 |
| Clydecom Limited | Professional & scientific | 2012 |
| Clydex Limited | Professional & scientific | 2012 |
| CMC Renewables Ltd | Construction | 2022 |
| Cmci Ltd | Real estate | 2025 |
| CMW Holdings Ayrshire Ltd | Real estate | 2023 |
| CNH Autos (Ayrshire) Ltd | Wholesale & retail | 2019 |
| Coarha Limited | Public administration | 2014 |
| Coastal Property AYR Ltd | Real estate | 2025 |
| Codecure Limited | Administrative & support | 2025 |
| Coffee Love Ltd | Hospitality | 2026 |
| Coffee Pixies Ltd | Hospitality | 2020 |
| Colart PFP (GP) Limited | Professional & scientific | 2013 |
| Colart PFP (LP) Limited | Professional & scientific | 2013 |
| Colart Scotland LP | | 2013 |
| Coleen Mckay Limited | Professional & scientific | 2022 |
| Collective Networking Ltd | Other services | 2025 |
| Collector One Limited | Wholesale & retail | 2026 |
| Colourful Choices Limited | Wholesale & retail | 2024 |
| Comaea Consulting (UK) Ltd | Professional & scientific | 2024 |
| Combined Inns (Eglinton) Limited | Hospitality | 2015 |
| Comfort Seating UK Ltd | Wholesale & retail | 2020 |
| Commando Property Group Ltd | Real estate | 2026 |
| Commsmasters Consulting Ltd | Professional & scientific | 2018 |
| Complete Caravan Company Ltd | Wholesale & retail | 2019 |
| Complete Cleaning Contracts Limited | Other services | 2009 |
| Completeica Limited | Professional & scientific | 2025 |
| Composite Projects and Resources Limited | Manufacturing | 2014 |
| Confriskate Ltd | Other services | 2018 |
| Connectnow Utilities Limited | Administrative & support | 2006 |
| Conquest Cycle Wear Ltd | Manufacturing | 2009 |
| Conquest Sports & Leisure Limited | Manufacturing | 2017 |
| Conquest Sportswear Limited | Manufacturing | 2017 |
| Contractor Aero Ltd | Professional & scientific | 2024 |
| Coral Contracts Ltd | Construction | 2020 |
| Core Deal Hub Ltd | Professional & scientific | 2025 |
| Corebody Ltd | Other services | 2025 |
| Corespace Ltd | Real estate | 2026 |
| Corespace Nominees Ltd | Real estate | 2026 |
| Corespace Selkirk 1 Ltd | Real estate | 2026 |
| Corespace Selkirk 2 Ltd | Real estate | 2026 |
| Corporate Travel Ltd | Administrative & support | 2025 |
| Corsewall Limited | Construction | 1995 |
| Corton Clean Limited | Other services | 2012 |
| Corton Plants Limited | Hospitality | 2018 |
| Corum (AYR) Limited | Real estate | 2005 |
| Cosmic Girl Ltd | Health & social care | 2023 |
| Costa Trading LP | | 2017 |
| Coughtrie Homes Ltd | Construction | 2025 |
| Courtney Properties and Developments Ltd. | Administrative & support | 2006 |
| Cova Deli Ltd | Hospitality | 2022 |
| Cowans Land and Property Development Ltd | Construction | 2024 |
| CPM Joinery & Timber Preservation Ltd | Construction | 2021 |
| CRA Solutions Ltd | Professional & scientific | 2018 |
| Craig Green Electrical Ltd | Construction | 2022 |
| Craig Group Holdings Limited | Financial services | 2022 |
| Craig Mcronald Transport Ltd | Transport & logistics | 2024 |
| Craig Murray Limited | Construction | 2018 |
| Craig Murray Solutions Limited | Construction | 2024 |
| Craig Tara Deluxe Caravan Holidays Limited | Hospitality | 2021 |
| Craig Wilson Holdings Limited | Financial services | 2021 |
| Craig Wilson Limited | Agriculture & fishing | 2002 |
| Craig-Leigh Transport Ltd | Transport & logistics | 2025 |
| Craig-Leigh Transport Services Ltd | Transport & logistics | 2018 |
| Craigie Development Limited | Education | 1985 |
| Craigie Retail Ltd | Wholesale & retail | 2025 |
| Craigowan Marine Limited | Professional & scientific | 2015 |
| Creative Media Holdings Ltd | Information & communication | 2026 |
| Creatur Limited | Professional & scientific | 2019 |
| Creston Assets LP | | 2014 |
| Crewgreen LP | | 2014 |
| Cristalclear Cleaning Ltd | Administrative & support | 2013 |
| Crofthead Holiday Park Limited | Hospitality | 2001 |
| Cromwell Consulting AYR. Limited | Information & communication | 2021 |
| Crosshead Media Ltd | Information & communication | 2019 |
| Crown Handbags Limited | Wholesale & retail | 2022 |
| Crown Leisure Vehicles Limited | Wholesale & retail | 2013 |
| Crown Street Lighting Ltd | Wholesale & retail | 2018 |
| Crucible (Blantyre) Limited | Professional & scientific | 2019 |
| Crucible (Dundee) Limited | Professional & scientific | 2017 |
| Crucible (Edinburgh Park) Limited | Professional & scientific | 2017 |
| Crucible (Galston) Limited | Professional & scientific | 2016 |
| Crucible (Stirling) Limited | Professional & scientific | 2016 |
| Crucible (Torrance Park) Limited | Professional & scientific | 2019 |
| Crucible Developments (Residential) Limited | Real estate | 2019 |
| Crucible Developments (Scotland) Limited | Administrative & support | 2012 |
| Crucible Developments Asset Management Limited | Administrative & support | 2015 |
| Cruickshanks Aviation Engineering Limited | Manufacturing | 2018 |
| Crumbs & Cocktails Limited | Hospitality | 2014 |
| Crumwood Investments Limited | Information & communication | 2014 |
| CS Composites Ltd | Manufacturing | 2023 |
| CSG Electrical Services Ltd | Construction | 2025 |
| Csjc Caravans Ltd | Wholesale & retail | 2026 |
| CTL Avionics Limited | Other services | 2025 |
| Cucina Marcia | | 1978 |
| Culinary Creations Five Ltd | Hospitality | 2024 |
| Culzean Consulting Ltd | Financial services | 2011 |
| Culzean Holdings Limited | Financial services | 2025 |
| Culzean Transport (Ayrshire) Ltd | Transport & logistics | 2013 |