| Castle NO 30 Ltd | Real estate | 2021 |
| Castle Operations Ltd | Financial services | 2010 |
| Castle Park Guest House Ltd | Hospitality | 2019 |
| Castle Pharmacovigilance Limited | Professional & scientific | 2009 |
| Castle Properties Limited | Construction | 2004 |
| Castle Removals Limited | Transport & logistics | 2013 |
| Castle Road Supermarket Ltd | Wholesale & retail | 2019 |
| Castle Rock Contracts Limited | Professional & scientific | 2016 |
| Castle Rock Plumbing, Heating and Renewables Ltd | Construction | 2026 |
| Castle Rockbysea Ltd | Real estate | 2024 |
| Castle Shawarma House Ltd | Hospitality | 2023 |
| Castle Street Development Company Limited | Administrative & support | 2024 |
| Castle Street Nominees Limited | Extraterritorial | 1972 |
| Castle Street Trustees | Professional & scientific | 1991 |
| Castle Sween Holiday Park Limited | Hospitality | 2026 |
| Castle Transport L.P. | | 2012 |
| Castle Trees Arborists Ltd | Agriculture & fishing | 2025 |
| Castle View Cigars Ltd | Wholesale & retail | 2025 |
| Castle View Edinburgh Limited | Real estate | 2023 |
| Castle View Gift Shop Limited | Wholesale & retail | 2025 |
| Castle Zenon Ltd | Real estate | 2024 |
| Castlebrae Sales and Letting Limited | Real estate | 2006 |
| Castlebrook Associates L.P. | | 2010 |
| Castlebrook Industrial L.P. | | 2014 |
| Castlebrook Investments L.P. | | 2011 |
| Castlecliffe Consulting Limited | Education | 2025 |
| Castlecorp L.P. | | 2010 |
| Castlecorp Services L.P. | | 2010 |
| Castlecrown Limited | Professional & scientific | 2001 |
| Castledean Limited | Professional & scientific | 2001 |
| Castlegate Investments (Edinburgh) Limited | Hospitality | 1979 |
| Castlegate Union Limited | Financial services | 2019 |
| Castlegrange Investments L.P. | | 2011 |
| Castlelaw Alpha LP | | 2016 |
| Castlelaw Bonded Warehouses (Glenrothes) Ltd | Real estate | 2022 |
| Castlelets Limited | Real estate | 2024 |
| Castlereagh International LP | | 2015 |
| Castlewood Europe L.P. | | 2008 |
| Castlewood Investments L.P. | | 2011 |
| Castlewood Sales L.P. | | 2011 |
| Casuum LP | | 2017 |
| Cat & Peacock Garden Centre Ltd | Wholesale & retail | 2015 |
| Cat DIM SUM Limited | Hospitality | 2022 |
| Cat Professional Limited | Professional & scientific | 2009 |
| Cat Scotland Ltd | Other services | 2020 |
| Cat Ventures Holding LP | | 2025 |
| Cat's Cradle Education and Organising Ltd | Education | 2022 |
| Cataclistum Ltd | Wholesale & retail | 2021 |
| Catahoula Limited | Information & communication | 2026 |
| Catalina Promotions LP | | 2016 |
| Catalog Ltd | Wholesale & retail | 2011 |
| Catalyst Business Solutions Limited | Professional & scientific | 2014 |
| Catalyst EPF (S) GP Limited | Administrative & support | 2007 |
| Catalyst EPF (S) Limited Partnership | | 2007 |
| Catalyst EPF (Scots) GP Limited | Financial services | 2008 |
| Catalyst EPF (Scots) L.P. | | 2008 |
| Catalyst EPF II (S) GP Limited | Administrative & support | 2014 |
| Catalyst EPF II (S) LP | | 2014 |
| Catalyst EPF II (Scots) GP Limited | Administrative & support | 2014 |
| Catalyst EPF II (Scots) LP | | 2014 |
| Catalyst Frontier Group Limited | Wholesale & retail | 2025 |
| Catalyst Insight Partners Ltd | Professional & scientific | 2022 |
| Catalytic Capital Ltd | Financial services | 2026 |
| Catalyzor Ltd | Professional & scientific | 2024 |
| Catbatdog Ltd | Wholesale & retail | 2021 |
| Catch at Bijou by the Sea Ltd | Hospitality | 2023 |
| Catch Technologies Limited | Information & communication | 2017 |
| Catcher and Caught Ltd | Manufacturing | 2026 |
| Catchment Moray Holdings Limited | Professional & scientific | 2000 |
| Catchment Moray Limited | Water & waste | 2000 |
| Catchment TAY Holdings Limited | Water & waste | 1998 |
| Catchment TAY Limited | Water & waste | 1998 |
| Catchy Solution LP | | 2016 |
| Catco Developments L.P. | | 2009 |
| Catco Resources L.P. | | 2011 |
| Catena Trading LP | | 2017 |
| Catering Brasero Ltd | Hospitality | 2025 |
| Catering Edinburgh Ltd | Hospitality | 2016 |
| Catering Equipment Repairs and Maintenance Limited | Manufacturing | 2009 |
| Catering Industries LP | | 2012 |
| Catesby Development Land Limited | Construction | 2010 |
| Catesby Estates (Developments II) Limited | Construction | 2003 |
| Catesby Estates (Developments) Limited | Construction | 2006 |
| Catesby Estates Promotions Limited | Construction | 2004 |
| Catesby Land and Planning Limited | Construction | 2004 |
| Catesby Land Promotions Limited | Construction | 2005 |
| Catesby Promotions Limited | Construction | 2006 |
| Cathcart Associates Group Limited | Professional & scientific | 2013 |
| Cathcart Associates Ltd | Administrative & support | 2009 |
| Cathcart Group Holdings Limited | Financial services | 2020 |
| Cathcart Technology Holdings Limited | Financial services | 2020 |
| Cathedral City Estates Limited | Real estate | 2012 |
| Catherine Bowie Training Services Limited | Education | 2009 |
| Catherine Rayner Trading Ltd | Wholesale & retail | 2019 |
| Catherine Rutter PA Limited | Administrative & support | 2019 |
| Cathian Investments Limited | Administrative & support | 2019 |
| Cathkin Energy Limited | Energy | 2004 |
| Cathkin Services L.P. | | 2014 |
| Cation IT Consulting Limited | Extraterritorial | 2014 |
| Catlab Ltd | Wholesale & retail | 2015 |