| Campbeltown 8 Ltd | Hospitality | 2023 |
| Camsta Automotive Ltd | Wholesale & retail | 2026 |
| CAN Buddy Ltd | Wholesale & retail | 2021 |
| CAN WE Clean Ltd | Administrative & support | 2022 |
| Candleinn Ltd | Wholesale & retail | 2025 |
| Capec LP | | 2014 |
| Capital Growth Solutions Ltd | Real estate | 2023 |
| Captuayr Limited | Extraterritorial | 2019 |
| Car Collection and Delivery UK Ltd | Extraterritorial | 2024 |
| Caracal UK Limited | Wholesale & retail | 2008 |
| Cards Express Limited | Wholesale & retail | 2017 |
| Carl Saville Design Ltd | Other services | 2017 |
| Carlyle Portfolio Limited | Real estate | 2009 |
| Carollan Sales LP | | 2014 |
| Caroma Detailing Ltd | Wholesale & retail | 2025 |
| Carrick 2020 Limited | Professional & scientific | 2019 |
| Carrick Bathrooms Limited | Administrative & support | 2002 |
| Carrick Community Transport Group Limited | Transport & logistics | 2007 |
| Carrick Fern Holdings Ltd | Financial services | 2024 |
| Carrick Pharma Ltd | Wholesale & retail | 2021 |
| Carson Coaching Ltd | Professional & scientific | 2018 |
| Casa Alba Consulting Limited | Professional & scientific | 2017 |
| Casa Design Architects Ltd | Professional & scientific | 2014 |
| Casa Dunmar Ltd | Real estate | 2025 |
| Casa Mcmillan Ltd | Real estate | 2020 |
| Cassidy Campbell Limited | Arts & recreation | 2018 |
| Castell Trade LP | | 2014 |
| Castle Clyde Limited | Extraterritorial | 2020 |
| Castlebay Corton Developments Limited | Real estate | 2019 |
| Castlehill Residential Lettings Limited | Households | 2009 |
| Cattle Services (AYR) Limited | Agriculture & fishing | 1965 |
| Cavaza Systems LP | | 2016 |
| CB Invest Limited | Real estate | 2016 |
| Cbhr Limited | Professional & scientific | 2012 |
| CC (Scotland) Ltd | Other services | 2018 |
| CC PAY Ltd | Information & communication | 2024 |
| Ccbj Ltd | Construction | 2025 |
| CCI Engineering Consultancy Limited | Transport & logistics | 2024 |
| CD3 Properties Ltd | Real estate | 2022 |
| CDC Lang Ltd | Health & social care | 2026 |
| CDM (Scotland) Limited | Professional & scientific | 1995 |
| CDS (AYR) Ltd | Other services | 2025 |
| CEH AYR Ltd | Wholesale & retail | 2021 |
| Celigny LAC Limited | Professional & scientific | 2025 |
| Cene Engineering Safety Ltd | Professional & scientific | 2026 |
| Central Asia Trade LP | | 2014 |
| Central Cafe (Stranraer) Ltd | Hospitality | 2020 |
| Central Environmental Ltd | Agriculture & fishing | 2016 |
| Centric Health Limited | Information & communication | 2010 |
| Ceres Events Limited | Administrative & support | 2012 |
| Certa EST Consultancy Ltd | Information & communication | 2018 |
| Certiva Property Solutions Limited | Households | 2026 |
| Cetacean Wave Limited | Professional & scientific | 2013 |
| Cewri Ltd | Information & communication | 2025 |
| Cfmj Limited | Hospitality | 2021 |
| CGB Translations Limited | Professional & scientific | 2012 |
| CGM (Ayrshire) Limited | Transport & logistics | 2016 |
| Chambers Bros. (Farm Appliances) Limited | Wholesale & retail | 1953 |
| Chaud Behind Limited | Hospitality | 2012 |
| Cherry Soda Ecosse Limited | Wholesale & retail | 2020 |
| Chill&Fit Ltd | Manufacturing | 2023 |
| Chinese Takeaway Ltd | Hospitality | 2020 |
| Chonzie Media Ltd | Professional & scientific | 2022 |
| Christie Financial Planning Limited | Financial services | 1998 |
| Christie Lites Glasgow Ltd | Administrative & support | 2023 |
| Christina's Bistro Ltd | Hospitality | 2016 |
| Christison Forestry Consulting Ltd | Agriculture & fishing | 2021 |
| Christopher Begley Aviation and Subsea Services Limited | Other services | 2017 |
| Citadel Taxis (AYR) Limited | Transport & logistics | 2017 |
| Civix Groundworks & Labour Ltd | Hospitality | 2025 |
| Civix Group Ltd | Professional & scientific | 2019 |
| CJL Capital Limited | Financial services | 2024 |
| Cjwm Limited | Real estate | 2021 |
| Clan Holdings (Ireland) Ltd | Financial services | 2026 |
| Clark Automation Solutions Ltd | Professional & scientific | 2012 |
| Clark Builders Ltd | Construction | 2024 |
| Clark Utilities Ltd | Information & communication | 2024 |
| Class Trade Solutions Ltd | Manufacturing | 2023 |
| Claymore Kilts Limited | Wholesale & retail | 2026 |
| Clear Choice Glass (Glasgow) Ltd | Construction | 2019 |
| Clear FP Limited | Financial services | 2017 |
| Clearfield Poultry Ltd | Agriculture & fishing | 2023 |
| Clearview (AYR) Ltd | Administrative & support | 2023 |
| Cleland Pharmacy Limited | Wholesale & retail | 2017 |
| Cleughearn Fishery Ltd | Agriculture & fishing | 2019 |
| Clic Properties AYR Limited | Construction | 2025 |
| Clocktower Events Ltd | Hospitality | 2026 |
| Cloe Trade LP | | 2014 |
| Close Protection Fran Perez Ltd | Administrative & support | 2025 |
| Cloud 9 Salon Ltd | Other services | 2018 |
| Cloud Accounting (Ayrshire) Ltd. | Professional & scientific | 2008 |
| Clova Consult Ltd | Professional & scientific | 2021 |
| Clydco Limited | Professional & scientific | 2012 |
| Clyde & Solway Systems Ltd. | Construction | 2008 |
| Clyde Castle Limited | Extraterritorial | 2020 |
| Clyde Chemical & Hygiene Supplies Ltd | Administrative & support | 2013 |
| Clyde Cruise Ships Limited | Extraterritorial | 2020 |
| Clyde Innovation Limited | Professional & scientific | 2012 |
| Clyde Studios Ltd | Arts & recreation | 2013 |
| Clydebuilt Group Limited | Professional & scientific | 2017 |