| Collective Pathways Limited | Gainsborough | 2025 |
| Collective Pensions Limited | London | 2025 |
| Collective Solutions Limited | Rotherham | 2025 |
| Collective VC Ltd | London | 2022 |
| Collective Ventures Group Ltd | London | 2026 |
| College Green Stores Holdings Limited | Hereford | 2026 |
| College Green Ventures Limited | Dungannnon | 2022 |
| College Grove Holdings Limited | Wakefield | 2017 |
| College Health Holdings Ltd | Rochester | 2020 |
| College Hill Capital Limited | London | 2020 |
| Collegia Partners Trustees Limited | Oxford | 2019 |
| Collegian Holdings Limited | Cookstown | 2022 |
| Collegiate House Limited | London | 1992 |
| Collegiate Management Services Limited | London | 1986 |
| Collegiate Securities PLC | Horsham | 1992 |
| Coller Capital Limited | London | 1995 |
| Colleran Holdings Limited | Heckmondwike | 2026 |
| Collett Acquisitions Limited | Halifax | 2025 |
| Collett Group Limited | Hereford | 1973 |
| Collett Holdings Limited | Halifax | 2016 |
| Collextion Limited | London | 2014 |
| Colley Holdings Limited | Driffield | 2025 |
| Colley Investments Holdings Limited | York | 2021 |
| Colliance Investments Ltd | London | 2021 |
| Collicutt Holdings Limited | Tonbridge | 2019 |
| Collidr Asset Management Limited | London | 2009 |
| Collidr Capital Limited | London | 2014 |
| Collie Holdings Limited | Musselburgh | 2023 |
| Collieflowers Holdings Limited | Morecambe | 2025 |
| Collier & Clark Group Limited | Lossiemouth | 2020 |
| Collier & Glynne Limited | Colchester | 2012 |
| Collier Brothers Holding Limited | Isleham | 2022 |
| Collier Group Holdings Limited | Portsmouth | 2026 |
| Collier Root Holdings Ltd | Colchester | 2025 |
| Collier Walker Limited | Loughborough | 2017 |
| Colliers Building Consultancy Holdings Limited | London | 2016 |
| Colliers Capital Holdings Limited | London | 2007 |
| Colliers Investment Management Italy Holdings Ltd | London | 2022 |
| Colliers Investment Management UK Holdings Limited | London | 2021 |
| Collinbridge Holdings Ltd | Belfast | 2010 |
| Collindale Limited | Frodsham | 2021 |
| Colling Investments Ltd | York | 2024 |
| Collingbourne Wealth Management Ltd | Winchester | 2005 |
| Collington Capital Limited | London | 2022 |
| Collington Holdings Limited | Nottingham | 2020 |
| Collingtree Ewan | London | 2018 |
| Collingtree Financial Limited | Northampton | 2006 |
| Collingwood Business Solutions Limited | North Shields | 1996 |
| Collingwood Insurance Services (U.K.) Limited | North Shields | 2001 |
| Collingwood Nominees Limited | Beaconsfield | 2014 |
| Collingwood Richardson and Co Limited | Shrewsbury | 1984 |
| Collingworth Capital Limited | London | 2025 |
| Collins & Clark Group Developments Limited | Norwich | 2018 |
| Collins & Co Financial Planning Ltd | Hinckley | 2021 |
| Collins & Co Holdings Ltd | London | 2025 |
| Collins & Darwell Holdings Limited | Leigh | 2012 |
| Collins & Sons Property Holdings Limited | Sheffield | 2018 |
| Collins (Contractors) Group Limited | Orpington | 2024 |
| Collins Canine Company Ltd | Cardiff | 2024 |
| Collins Capital Services Ltd | London | 2023 |
| Collins Clan Limited | Woking | 2025 |
| Collins Co Holdings Limited | Huntingdon | 2025 |
| Collins Communications Ltd | London | 2020 |
| Collins Dale Capital Investments Ltd | London | 2017 |
| Collins Dale Capital Partners Ltd | London | 2014 |
| Collins Education Ltd | Maldon | 2025 |
| Collins Enterprises (UK) Limited | East Sussex | 2006 |
| Collins Financial Enterprises Ltd | Portsmouth | 2024 |
| Collins Financial Ltd. | Motherwell | 2018 |
| Collins Group Holdings Ltd | Birmingham | 2021 |
| Collins Group Investments Limited | Covell Cross | 2001 |
| Collins Heritage Mortgages Limited | London | 2025 |
| Collins Holdings Ltd | Solihull | 2021 |
| Collins Investments Group Limited | Peterborough | 2026 |
| Collins Ladywell Limited | Kent | 2018 |
| Collins Medical Services Limited | Newry | 2013 |
| Collins Morgan Group Ltd | Glasgow | 2016 |
| Collins Nets Holdings Limited | Dorchester | 2013 |
| Collins Porter Financial Ltd | Paisley | 2019 |
| Collins Project Holdings Limited | Norwich | 2022 |
| Collins Sarri Statham Investments Limited | Muswell Hill | 2008 |
| Collins Vision Limited | Cosham | 2013 |
| Collinsdale Limited | Gateshead | 1992 |
| Collinson Ceramics Holdings 2 Limited | London | 2024 |
| Collinson Ceramics Holdings Limited | Edinburgh | 2020 |
| Collinson Group Holdings Limited | London | 2021 |
| Collinson Holdings Garstang Ltd | Preston | 2024 |
| Collinson Holdings Limited | Garstang | 1994 |
| Collinson Insurance Brokers Ltd. | London | 1994 |
| Collinson Insurance Services Limited | London | 1963 |
| Collinson Taylor Capital Ltd. | Durham | 2017 |
| Collinsowo UK Ltd | Glasgow | 2019 |
| Collinstown Contracting Limited | Bexleyheath | 2007 |
| Collioure Ventures Ltd. | Brighton | 2017 |
| Collis & Cantrill Holdings Ltd | Burntwood | 2018 |
| Collis Financial Services Limited | South Petherton | 2013 |
| Collkarn Group Limited | Newcastle Upon Tyne | 2026 |
| Colloco (Holdings) Limited | Sheffield | 2020 |
| Colloco Financial Limited | Epsom | 2013 |
| Colltex FOX Holdings Limited | Huddersfield | 2021 |