| Clermiston Vape HUT Ltd | Wholesale & retail | 2026 |
| Clermont Hotel Management Limited | Hospitality | 1968 |
| Clerwood Business Support Ltd | Administrative & support | 2023 |
| Clerwood Consultants Limited | Construction | 1997 |
| Clerwood Consulting Ltd | Information & communication | 2024 |
| Cleveland Business LP | | 2021 |
| Cleverjump Group LP | | 2017 |
| CLH Limited | Professional & scientific | 2019 |
| Click and Rent Ltd | Hospitality | 2015 |
| Click Transfert LP | | 2017 |
| Click Whirr Ltd | Information & communication | 2011 |
| Click YES Below LP | | 2014 |
| Clickads L.P. | | 2014 |
| Clickbang LP | | 2016 |
| Clicklist Ltd | Information & communication | 2026 |
| Clickmint Ltd | Wholesale & retail | 2025 |
| Clickstar Holdings Limited | Financial services | 2021 |
| Clickzou LP | | 2025 |
| Clienta Solutions Limited | Professional & scientific | 2026 |
| Clientmap Ltd | Information & communication | 2015 |
| Cliff Golf Ltd | Wholesale & retail | 2012 |
| Cliff Port LP | | 2016 |
| Cliff Shine Alliance LP | | 2016 |
| Cliff Technologies Limited | Administrative & support | 1996 |
| Cliffburn Property Limited | Real estate | 2016 |
| Cliffmark Systems L.P. | | 2013 |
| Clifford Alliance LP | | 2016 |
| Cliffword Trade LP | | 2012 |
| Clifton Networks L.P. | | 2014 |
| Cliftonmill Investments Limited | Real estate | 2004 |
| Clil International LP | | 2016 |
| Climacore Ltd | Information & communication | 2025 |
| Climate Change Legal Initiative Community Interest Company | Professional & scientific | 2023 |
| Climate Friendly Culture Ltd | Information & communication | 2022 |
| Climatescope Ltd | Professional & scientific | 2023 |
| Climbwired International Ltd | Professional & scientific | 2020 |
| Clinical and Corporate Wellbeing Ltd | Other services | 2026 |
| Clinical Biochemistry Conferences | Other services | 2003 |
| Clinical Diagnosis Ltd | Health & social care | 2026 |
| Clinical Healthcare Crew Limited | Administrative & support | 2022 |
| Clinical IT Ltd | Information & communication | 2015 |
| Clinicus LP | | 2021 |
| Clinitek (Stoke) GP Ltd | Financial services | 2020 |
| Clinitek Investor (Stoke) LP | | 2020 |
| Clinitek Investor GP Ltd | Financial services | 2019 |
| Clinitek Investor LP | | 2019 |
| Clinivia Health & Living Ltd | Health & social care | 2023 |
| Clint Estates Limited | Agriculture & fishing | 1939 |
| Clinton Mccraig Ltd | Professional & scientific | 2022 |
| Clio Trade LP | | 2015 |
| Clio Trading LP | | 2016 |
| Clip-On Limited | Information & communication | 2013 |
| Clive SLP | | 1996 |
| Cljc Property Ltd | Hospitality | 2026 |
| Clobco Ltd | Information & communication | 2017 |
| Clocktime | Arts & recreation | 2024 |
| Clocktower Leisure Ltd | Wholesale & retail | 2023 |
| Clockwise Software LP | | 2015 |
| Clockwork Global LP | | 2016 |
| Clockwork Group Holdings Limited | Professional & scientific | 2001 |
| Clockwork Live Ltd | Professional & scientific | 2023 |
| Clockwork Properties Limited | Real estate | 1999 |
| Clof II Partnership LP | | 2010 |
| Clondarl LP | | 2016 |
| Clongiffen Herd Ltd | Agriculture & fishing | 2009 |
| Clopton International | | 1990 |
| Clorettex LP | | 2017 |
| Closecut Barbers Ltd | Other services | 2026 |
| Closet Brewing Limited | Manufacturing | 2023 |
| Clotech Consulting LP | | 2016 |
| Cloth Ears Audio Ltd | Information & communication | 2020 |
| Clothing Baba Ltd | Wholesale & retail | 2025 |
| Cloud 9 Accounting Team Ltd | Professional & scientific | 2019 |
| Cloud Access Ltd | Information & communication | 2021 |
| Cloud C Consulting Limited | Information & communication | 2011 |
| Cloud Conception LP | | 2016 |
| Cloud Core LP | | 2017 |
| Cloud Ease LP | | 2016 |
| Cloud EX Vision LP | | 2015 |
| Cloud Finance & Accounting Ltd | Professional & scientific | 2018 |
| Cloud Moon Ltd | Wholesale & retail | 2025 |
| Cloud Native Quality Ltd | Information & communication | 2024 |
| Cloud Scotland Ltd | Information & communication | 2019 |
| Cloud Security Alliance (Europe) CIC | Information & communication | 2011 |
| Cloud Services LP | | 2011 |
| Cloud System Science LP | | 2016 |
| Cloud Tribe Ltd | Information & communication | 2017 |
| CLOUD9 Edinburgh Limited | Wholesale & retail | 2020 |
| Cloudbreak Management LP | | 2017 |
| Cloudbreak Marketing LP | | 2017 |
| Cloudcoco Holdings Limited | Administrative & support | 1986 |
| Cloudharbor Tech Ltd | Extraterritorial | 2025 |
| Cloudkaline LP | | 2016 |
| Cloudless Media Holding LP | | 2019 |
| Cloudsecure Services Limited | Information & communication | 2019 |
| Cloudsoft Corporation Limited | Information & communication | 2008 |
| Cloudtech Networking LP | | 2016 |
| Cloudwind Properties Ltd | Real estate | 2025 |
| Cloudyhale Impex LP | | 2013 |
| Clova Estate Limited | Agriculture & fishing | 1995 |