| Callaflow Ltd | Castle Eden, | 2020 |
| Callaghan Finance Limited | Liverpool | 2025 |
| Callaghan Financial Coaching Limited | Edinburgh | 2018 |
| Callan Connect Group Limited | Birmingham | 2024 |
| Callan Method Group Limited | London | 2015 |
| Callana Holdings Ltd | Castlewellan | 2022 |
| Calland Capital Limited | Rugby | 2025 |
| Calland Properties Limited | London | 1973 |
| Callander Mortgage Solutions Ltd | Stockton-On-Tees | 2019 |
| Callands Consultancy Limited | Warrington | 2015 |
| Callanish Capital Ltd | London | 2021 |
| Callanish Partners Ltd | London | 2020 |
| Callard Holding 25 Limited | Liss | 2025 |
| Callaway & Sons Insurance Consultants Limited | Essex | 2000 |
| Callaway Group Ltd | Caterham | 2021 |
| Callaway Holdings Limited | Pevensey Bay | 2020 |
| Callaway Sykes Associates Limited | Essex | 1971 |
| Callbean Limited | Richmond | 2018 |
| Caller Financial Solutions Ltd | Barnstaple | 2011 |
| Callerz Futures Ltd | Epping | 2026 |
| Calleva Holding Limited | Bridgwater | 2024 |
| Callida Finance Group Ltd | Wirral | 2022 |
| Callidus Holding Company Limited | London | 2023 |
| Callidus Wealth Management Ltd | Edinburgh | 2013 |
| Callie Creative Group Limited | London | 2024 |
| Callie Creative Limited | London | 2023 |
| Calligrew Ventures Ltd | Cheltenham | 2025 |
| Callington Investments Limited | London | 2024 |
| Calliper Investments Ltd | Hemel Hempstead | 2024 |
| Callisterhall Holdings Limited | Edinburgh | 2021 |
| Callistio Group Limited | Uttoxeter | 2025 |
| Callistio Limited | Oldham | 2026 |
| Callisto Capital Ltd | Ilford | 2024 |
| Callisto Finance Limited | Altrincham | 2021 |
| Callisto Offshore Wind Holdings Limited | London | 2022 |
| Callisto Offshore Wind Limited | London | 2022 |
| Callisto UK Bidco Limited | London | 2025 |
| Callisto UK GP Limited | London | 2025 |
| Callm Investments Ltd | Luton | 2019 |
| Callow GAS Holdings Limited | Stourport-On-Severn | 2021 |
| Calls Landing Ltd | Doncaster | 2025 |
| Callshaw Ltd | Clitheroe | 2023 |
| Callshaw Topco Ltd | Clitheroe | 2025 |
| Callson Limited | Edinburgh | 1980 |
| Callum Small Mortgages Limited | Sittingbourne | 2020 |
| Calluna Capital Ltd | Bristol | 2020 |
| Calluna Enterprises Ltd | Taunton | 2011 |
| Calluna Financial Limited | Alloa | 2024 |
| Calluna House Ltd | Taunton | 2016 |
| Calluna Silva Limited | London | 2024 |
| Callund and Company Limited | Reading | 1975 |
| Cally Mains Limited | Castle Douglas | 2025 |
| Cally Yard Holdings Ltd | London | 2021 |
| Cally Yard Mezzco Ltd | London | 2022 |
| Callyn Ltd | Hornchurch | 2024 |
| Calm Capital Investment Limited | Newport | 2026 |
| Calm Finance Holdings Limited | London | 2008 |
| Calm Investments Ltd | London | 2013 |
| Calma Specialty Ltd | London | 2024 |
| Calmag Holdings Limited | Reading | 2023 |
| Calmcast Limited | Gateshead | 2019 |
| Calmeco Holdings Ltd | Northampton | 2024 |
| Calmez Ltd | London | 2006 |
| Calmfors Holding Ltd | London | 2022 |
| Calminster Group Ltd | Leigh On Sea | 2022 |
| Calmlight Limited | Whitefield | 2012 |
| Calmor Holdings Limited | Dungiven | 2026 |
| Calmore Investment | Derry | 2025 |
| Calmseas Limited | Cheltenham | 1999 |
| Calnic Investments Limited | London | 2009 |
| Calon Energy (Investments) Limited | London | 2012 |
| Calon Energy Limited | London | 2014 |
| Calon Holdings Ltd | Cookstown | 2019 |
| Calon Mortgages Ltd | Llanelli | 2023 |
| Calor Pension Trust Limited | Warwick | 1964 |
| Calow Holdco Ltd | Bury | 2024 |
| Calow Holdings & Marketing Ltd | Sheffield | 2023 |
| Calpa Capital Ltd | London | 2017 |
| Calpa Coombes Investments Limited | Wallington | 2026 |
| Calpark (Holdings) Limited | Glasgow | 2024 |
| Calpe Capital Limited | London | 2026 |
| Calpe Financial Solutions Limited | Romsey | 2005 |
| Calpe Holdco Limited | London | 2014 |
| Calpe Holdings Limited | Godalming | 2023 |
| Calrom TIG Co Ltd | Ellesmere Port | 2023 |
| Calsam Holdings Limited | Belfast | 2024 |
| Calshot Group Limited | Southampton | 2021 |
| Calsite Company Limited | Manchester | 2012 |
| Calsite Holdings Limited | Manchester | 2021 |
| Caltheon Ltd | Wimborne | 2023 |
| Caltherm Industries Limited | Cheserton | 1981 |
| Calthorpe Medical Limited | Birmingham | 2025 |
| Calton Wealth Management Ltd | Edinburgh | 2020 |
| Caltz Investment Holdings Ltd | Preston | 2019 |
| Calum Biggs Ltd | Mountain Ash | 2023 |
| Calunga Ltd | London | 2025 |
| Caluu UK Holdings Ltd | London | 2024 |
| Caluu UK Intermediary Ltd | London | 2024 |
| Calver Groom Limited | Surrey | 2006 |
| Calver Group Limited | Hope Valley | 2020 |