| Buxer Pads Ltd | Wholesale & retail | 2024 |
| Buy ME Dinner.Com Ltd | Information & communication | 2025 |
| Buyright Direct Limited | Wholesale & retail | 2024 |
| Buzhiqi Construction Ltd | Construction | 2023 |
| Buzz HK Services Ltd | Administrative & support | 2014 |
| Buzz Housekeeping Services Ltd | Administrative & support | 2005 |
| Buzz.T-Sh Ltd | Wholesale & retail | 2026 |
| BVL Distribution Ltd | Transport & logistics | 2025 |
| BW Motors Group Ltd | Administrative & support | 2025 |
| BWA (Bracknell UK) Ltd | Other services | 2015 |
| BWS London Limited | Information & communication | 2016 |
| BX3 World Ltd | Wholesale & retail | 2026 |
| BXM Designs Ltd | Manufacturing | 2020 |
| BY Magu Ltd | Wholesale & retail | 2026 |
| Bydian Ltd | Other services | 2023 |
| Bydsecurity&Services Ltd | Administrative & support | 2025 |
| Bymik Limited | Information & communication | 2021 |
| Byout Ltd | Real estate | 2024 |
| Bytehive Ltd | Information & communication | 2025 |
| Byteomatic Solutions Ltd | Information & communication | 2019 |
| Bytesphere Digital Ltd | Information & communication | 2025 |
| Bzmart Ltd | Real estate | 2023 |
| C & C Groundworks (UK) Co Ltd | Construction | 2015 |
| C & Drive Ltd | Transport & logistics | 2025 |
| C & F Electrical Contractors Ltd | Construction | 2025 |
| C C Construction (London) Limited | Households | 2015 |
| C E M Design Ltd | Construction | 2020 |
| C Painting & Decorating Services Limited | Construction | 2025 |
| C&C Delivery Ltd | Transport & logistics | 2020 |
| C&M Spedition Ltd | Construction | 2021 |
| C&O Experts Limited | Construction | 2016 |
| C-Wad Consultancy Limited | Professional & scientific | 2024 |
| C. Blumsom Holdings Limited | Professional & scientific | 2015 |
| C.C Global Ventures Ltd | Administrative & support | 2025 |
| Caboodl Tech Limited | Information & communication | 2023 |
| Cabworth Taxi Repairs Ltd | Wholesale & retail | 2016 |
| Cadneil Services Limited | Information & communication | 2020 |
| Cafe Karachii Limited | Hospitality | 2026 |
| Caffe Italiano UK Ltd | Hospitality | 2024 |
| Cajebesto Limited | Hospitality | 2021 |
| Cake and Custard Co Ltd | Wholesale & retail | 2026 |
| Cake Stoppa Limited | Manufacturing | 2023 |
| Cake Thrive Limited | Wholesale & retail | 2017 |
| Cakeaholics Limited | Hospitality | 2025 |
| Cakes Delight Ltd | Wholesale & retail | 2016 |
| Calemir Ltd | Construction | 2018 |
| Cali Property Group Limited | Real estate | 2026 |
| Call Caterlink Ltd | Professional & scientific | 1993 |
| Callalie Cakes Ltd | Manufacturing | 2020 |
| Calu Ltd | Construction | 2015 |
| Camden Capital Limited | Real estate | 2026 |
| Camden Supermarket Ltd | Wholesale & retail | 2026 |
| Camel Imex Company Ltd | Wholesale & retail | 2019 |
| Camp Trans CIC | Arts & recreation | 2023 |
| Campaign for Protection of Religious Minorities in Bangladesh | Health & social care | 2017 |
| Campout Limited | Administrative & support | 2025 |
| CAN Recruitment Ltd | Administrative & support | 2021 |
| Canda Legal and Property Consultancy Ltd | Professional & scientific | 2025 |
| Cannagold CBD Limited | Hospitality | 2019 |
| Cannan Land Enterprise Limited | Health & social care | 2009 |
| Cannon Tunnel & Civils Ltd | Construction | 2024 |
| Canone Ltd | Real estate | 2025 |
| Canwing Limited | Construction | 2021 |
| Canyon Innovations Ltd | Wholesale & retail | 2024 |
| Capital Airports Limited | Transport & logistics | 2024 |
| Capital One Properties Services Ltd | Real estate | 2023 |
| Capitaleye Ltd | Wholesale & retail | 2025 |
| Capitalsif Limited | Real estate | 2020 |
| Caplan and Caplan Ltd | Hospitality | 2023 |
| Cappsten Ltd | Construction | 2024 |
| Captionworldz Ltd | Information & communication | 2017 |
| Car and Colour Limited | Professional & scientific | 2023 |
| Car Clinic Repair Centre Ltd | Wholesale & retail | 2019 |
| Car Keys London UK Ltd | Wholesale & retail | 2025 |
| Caramel Healthcare Limited | Administrative & support | 2022 |
| Carben Health Ltd | Health & social care | 2025 |
| Carciti (UK) Limited | Wholesale & retail | 2021 |
| Cardea Coaching Limited | Professional & scientific | 2023 |
| Care & Kare Works Management Ltd | Administrative & support | 2017 |
| Care City Innovation C.I.C. | Information & communication | 2019 |
| Care Elysian Ltd | Information & communication | 2023 |
| Care for YOU Southend Limited | Health & social care | 2025 |
| Care Properties Group Ltd | Real estate | 2023 |
| Care Qters Ltd | Health & social care | 2022 |
| Care Square Ltd | Real estate | 2020 |
| Carebri Ltd | Health & social care | 2021 |
| Career Academy Trust | Education | 2024 |
| Career Guide Consultancy Ltd | Administrative & support | 2024 |
| Carenextdoor Ltd | Health & social care | 2015 |
| Carerose Cares Limited | Other services | 2013 |
| CARESUPPORT247 Ltd | Administrative & support | 2024 |
| Carex BIO Ltd | Professional & scientific | 2025 |
| Caribbean Cuisine Street Food Limited | Hospitality | 2024 |
| Caribiscus Ltd | Manufacturing | 2019 |
| Caringharbor Ltd | Health & social care | 2023 |
| Carmatics Ltd | Wholesale & retail | 2018 |
| Carnegie Gate Limited | Real estate | 2024 |
| Carpet Factory Shop Limited | Wholesale & retail | 2024 |
| Carriage Solutions (London) Ltd | Other services | 2017 |
| Carriageway Hire Ltd | Administrative & support | 2020 |