| Cambridge Country Club Group Limited | Hospitality | 2017 |
| Cambridge Country Club Operations Limited | Hospitality | 2017 |
| Cambridge Education & Research Organisation Ltd. | Education | 2012 |
| Cambridge Facades Limited | Construction | 2023 |
| Cambridge HIP & Knee Surgery Ltd | Health & social care | 2022 |
| Cambridge Precision Health Limited | Health & social care | 2025 |
| Cambridge Private Health Ltd | Health & social care | 2022 |
| Cambridge Syndicate Ltd | Professional & scientific | 2012 |
| Cambridge Tyres Limited | Manufacturing | 2025 |
| Cambridge Women’S Health Limited | Health & social care | 2022 |
| Cambs Property Investment Ltd | Real estate | 2025 |
| Campbell Collins Group Limited | Wholesale & retail | 1982 |
| Campbells Surveyors Limited | Professional & scientific | 2007 |
| Campers Avenue Limited | Real estate | 2023 |
| Cams Fire & Security PLC | Other services | 1984 |
| Camvir Investments Limited | Real estate | 2023 |
| CAN SEE Cant SEE Ltd | Professional & scientific | 2022 |
| Canabide (UK) Limited | Professional & scientific | 2019 |
| Canadent Ltd | Health & social care | 2022 |
| Canary Charcoal Ltd | Wholesale & retail | 2023 |
| Canea Properties Ltd | Real estate | 2019 |
| Canebrake Ltd | Manufacturing | 2015 |
| Canine DIP and Dive Hertford Limited | Administrative & support | 2026 |
| Capital Fire Safety Limited | Professional & scientific | 2012 |
| Capital Kempston Hardwick Limited | Construction | 2016 |
| Capital Property Clearances Limited | Transport & logistics | 2021 |
| Capital Stewartby Limited | Construction | 2016 |
| Capitalwave Investments Ltd | Construction | 2015 |
| Capitalwave Limited | Real estate | 2015 |
| Capture Comms Limited | Manufacturing | 2017 |
| Capture DOP Ltd | Other services | 2014 |
| Caratacus Consulting Limited | Information & communication | 2026 |
| Carbide Recycling Ltd | Water & waste | 2012 |
| Carbon Tree Care Ltd | Agriculture & fishing | 2025 |
| Cardiff Cosmetic Clinic Ltd | Health & social care | 2017 |
| Care 121 Services Ltd | Health & social care | 2015 |
| Care by Buccah Ltd | Health & social care | 2020 |
| Care for Cambodia | Other services | 2013 |
| Care Fully Ltd | Health & social care | 2011 |
| Care Nest Properties Ltd | Real estate | 2024 |
| Care Plus YOU CIC | Health & social care | 2023 |
| Care Quality Consultancy Limited | Other services | 2019 |
| Carefirst Logistics Ltd | Health & social care | 2026 |
| Carer Centricity Ltd | Health & social care | 2023 |
| Careshield Clinical Limited | Education | 2014 |
| Careshield International Ltd | Extraterritorial | 2014 |
| Careshield Learning Limited | Education | 2016 |
| Cari ME Home Limited | Hospitality | 2021 |
| Caring Hair | Health & social care | 2011 |
| Caring Herts CIC | Health & social care | 2026 |
| Carla Kaempfer Services Ltd | Professional & scientific | 2019 |
| Carlo's Barbers Limited | Other services | 2012 |
| Carlton System Installations Limited | Wholesale & retail | 1994 |
| Carlton Taverns Limited | Hospitality | 2023 |
| Carmelite Estates Limited | Real estate | 2026 |
| Carolina Property Holdings Ltd | Real estate | 2020 |
| Carosam Limited | Administrative & support | 2013 |
| Carp Fishing Socials Ltd | Arts & recreation | 2026 |
| Carpathian Blue Security Ltd | Administrative & support | 2022 |
| Carpathica Ltd | Wholesale & retail | 2017 |
| Carpe DM Project Management Limited | Professional & scientific | 2025 |
| Carpenco Engineering Services Ltd | Construction | 2023 |
| Carpencom Ltd | Construction | 2012 |
| Carr Consulting and Communications LLP | | 2016 |
| Carrie in Clover LLP | | 2025 |
| Cars by L88SEU Ltd | Wholesale & retail | 2025 |
| Carter Financial Planning Ltd | Professional & scientific | 2022 |
| Carter Projects and Ventures Limited | Professional & scientific | 2024 |
| Carters Family Butchers (Acle) Limited | Wholesale & retail | 2015 |
| Cartflow Ltd | Wholesale & retail | 2026 |
| Carus Animal Health Limited | Other services | 2017 |
| Casa FE Creatives Ltd | Professional & scientific | 2021 |
| Casa Pro Ltd | Other services | 2024 |
| Casaile Ltd | Real estate | 2024 |
| Casanest Ltd | Real estate | 2025 |
| Case Management CHC Limited | Public administration | 2021 |
| Cassandra Costumes Ltd | Administrative & support | 2026 |
| Casson Fernando Holdings Ltd | Hospitality | 2024 |
| Castillo House Limited | Other services | 2004 |
| Castle Searchers Limited | Real estate | 2022 |
| Castle Shutters Limited | Manufacturing | 2013 |
| Cate Calco Limited | Wholesale & retail | 2018 |
| CATER4YOUR Recruitment Ltd | Administrative & support | 2025 |
| Caterind Limited | Administrative & support | 2017 |
| Caterkit Services Limited | Manufacturing | 1990 |
| Catman Services Limited | Information & communication | 2012 |
| Catmed Ltd | Health & social care | 2024 |
| Catshead Limited | Agriculture & fishing | 2006 |
| Caulfield Holdings LLP | | 2015 |
| Cavan Court Management Company Limited | Real estate | 1989 |
| Cavus Bistro Ltd | Hospitality | 2023 |
| Cawdrons Limited | Other services | 2021 |
| Caxton Gate (Stevenage) Management Company Limited | Real estate | 2018 |
| CB Accountants (UK) Ltd | Professional & scientific | 2014 |
| CB Electrical (UK) Limited | Construction | 2003 |
| CB Healthcare Ltd | Wholesale & retail | 2014 |
| CB One Solution Ltd | Water & waste | 2016 |
| CBT Developments Limited | Manufacturing | 2006 |
| CBY Trading Ltd | Wholesale & retail | 2021 |
| CCB Haulage Ltd | Transport & logistics | 2021 |