| Connected Care Ltd | Health & social care | 2023 |
| Connected Communities Ltd | Other services | 2016 |
| Connected Housing Ltd | Real estate | 2025 |
| Connected Housing Solutions Ltd | Hospitality | 2025 |
| Connected Mobility Ltd | Professional & scientific | 2020 |
| Connected Solutions IT Ltd | Information & communication | 2022 |
| Connectfirst Academy Ltd | Education | 2026 |
| Connectfutures C.I.C. | Administrative & support | 2016 |
| Connectfutures Group Ltd | Administrative & support | 2023 |
| Connectify Limited | Real estate | 2026 |
| Connecting Element Limited | Information & communication | 2019 |
| Connecting Through Clay and Art CIC | Education | 2026 |
| Connection Capital Carried Interest Limited | Professional & scientific | 2012 |
| Connection Capital Investments Limited Partnership | | 2009 |
| Connection Capital LLP | | 2009 |
| Connection Capital Management LLP | | 2009 |
| Connection Riverside Birmingham Limited Partnership | | 2012 |
| Connection Riverside Meridian Limited Partnership | | 2014 |
| Connection Riverside Pentagon Limited Partnership | | 2014 |
| Connection Riverside Sittingbourne Limited Partnership | | 2012 |
| Connection Riverside Torquay Limited Partnership | | 2015 |
| Connection Riverside Vauxhall Limited Partnership | | 2013 |
| Connection Riverside Warth Limited Partnership | | 2013 |
| Connection Service Limited | Professional & scientific | 2016 |
| Connection Systems Limited | Administrative & support | 2010 |
| Connection Therium NO 1 LLP | | 2017 |
| Connection Therium NO 2 LLP | | 2018 |
| Connections Consultancy Limited | Professional & scientific | 2015 |
| Connections Transport Ltd | Transport & logistics | 2022 |
| Connective Online Limited | Information & communication | 2022 |
| Connectivity Partners Ltd | Information & communication | 2019 |
| Connectous Ltd | Construction | 2025 |
| Connectrecruitmenthub Ltd | Administrative & support | 2023 |
| Connellys' Gym Limited | Other services | 2020 |
| Connex Social Housing Limited | Real estate | 2018 |
| Connexion Precision Finance Limited | Financial services | 2018 |
| Connexion Precision Technologies EBT Limited | Administrative & support | 2022 |
| Connexion Precision Technologies Limited | Professional & scientific | 2017 |
| Connexium Limited | Professional & scientific | 2024 |
| Connik Jewellery Ltd | Wholesale & retail | 2021 |
| Connix Consulting Limited | Real estate | 2024 |
| Connolly's Group Ltd | Financial services | 2020 |
| Connolly's Holdings Ltd | Financial services | 2018 |
| Connolly's Wine Bars Ltd | Wholesale & retail | 2018 |
| Connolly’S PUB Group Ltd | Hospitality | 2023 |
| Connor Dowds Ltd | Construction | 2024 |
| CONO4 Ltd | Professional & scientific | 2024 |
| Conoscenza Ltd | Health & social care | 2021 |
| Conquer Career Ltd | Administrative & support | 2021 |
| Conquer IT Limited | Information & communication | 2014 |
| Conquer Security Ltd | Administrative & support | 2025 |
| Conrea Limited | Hospitality | 2026 |
| Conroy Real Estate Limited | Real estate | 2004 |
| Conscious Hospitality Ltd | Real estate | 2023 |
| Conscious Ventures Global Limited | Information & communication | 2024 |
| Conservative Friends of Romania Limited | Administrative & support | 2019 |
| Conset Limited | Professional & scientific | 2019 |
| Consilient Care Ltd | Wholesale & retail | 2025 |
| Consilium Agency Limited | Real estate | 2020 |
| Consilium Global Limited | Professional & scientific | 2014 |
| Consilium Technical Services Limited | Information & communication | 2014 |
| Consilix Ltd | Professional & scientific | 2024 |
| Consistent Fitness Ltd | Arts & recreation | 2025 |
| Consol Tanning Limited | Financial services | 2010 |
| Consolle MAN Ltd | Wholesale & retail | 2025 |
| Consoltech Limited | Information & communication | 2025 |
| Consort Glass Ltd | Wholesale & retail | 2026 |
| Consort Glass Solutions Ltd | Wholesale & retail | 2019 |
| Consort Residents Management Company Limited | Households | 2019 |
| Consortium Holdings Limited | Financial services | 1999 |
| Consortium Jewellery Limited | Manufacturing | 1986 |
| Constant Continuity Limited | Information & communication | 2014 |
| Constantin Ovidiu Limited | Manufacturing | 2022 |
| Constantin Transport SRL Limited | Wholesale & retail | 2026 |
| Constantine Investments Limited | Real estate | 2007 |
| Constat International Limited | Other services | 2018 |
| Constellation Training Ltd | Education | 2022 |
| Constest Events Limited | Arts & recreation | 2024 |
| Constituency Estates Ltd | Real estate | 2024 |
| Constology Ltd | Professional & scientific | 2018 |
| Construct & Cool Limited | Construction | 2025 |
| Construct Aden Limited | Professional & scientific | 2025 |
| Construct Facades Ltd | Construction | 2025 |
| Constructavision Ltd | Professional & scientific | 2025 |
| Constructb Limited | Real estate | 2019 |
| Constructed Ltd | Construction | 2025 |
| Construction Solutions (Birmingham ) Limited | Real estate | 2020 |
| Construction and Demolition Services Limited | Construction | 2019 |
| Construction BFF Ltd | Construction | 2023 |
| Construction Builders Clean Ltd | Water & waste | 2020 |
| Construction College Midland Limited | Education | 2023 |
| Construction Design Management Limited | | 1990 |
| Construction Halley Limited | Construction | 2025 |
| Construction Holdings Limited | Construction | 2020 |
| Construction Management and Building Control Ltd | Professional & scientific | 2019 |
| Construction Needs Limited | Construction | 2012 |
| Construction Products Limited | | 1985 |
| Construction Senior Talent Ltd | Administrative & support | 2012 |
| Construction Services and Facilities Ltd | Construction | 2022 |
| Construction Shield Ltd | Financial services | 2018 |