| Coskids Ltd | Extraterritorial | 2025 |
| Coslure Ltd | Wholesale & retail | 2025 |
| Cosmaesthetics Limited | Education | 2020 |
| Cosmic Days Limited | Professional & scientific | 2026 |
| Cosmius Ltd | Information & communication | 2026 |
| Cosmixy Limited | Wholesale & retail | 2024 |
| Cosmonova Trade Co., Ltd | Wholesale & retail | 2025 |
| Cosmoseed UK Limited | Wholesale & retail | 2024 |
| Costa Global Moving Ltd | Transport & logistics | 2025 |
| Costantini.Club Ltd. | Wholesale & retail | 2019 |
| Costar Interactive Co. Ltd | Wholesale & retail | 2025 |
| Costco Health Ltd | Wholesale & retail | 2025 |
| Coston Search Limited | Administrative & support | 2025 |
| Cosyev Ltd | Wholesale & retail | 2025 |
| Cotec Designs Limited | Professional & scientific | 1999 |
| Cotswold Echo Innovations Ltd | Information & communication | 2025 |
| Cotswold First AID Hub Ltd | Education | 2026 |
| Cotswold Home & Garden Clearance Ltd | Transport & logistics | 2025 |
| Cotswold Marketing and Events Limited | Professional & scientific | 2025 |
| Cotswold Nest Home Furnishing Ltd | Wholesale & retail | 2025 |
| Cottonkit Ltd | Wholesale & retail | 2025 |
| Cougson Investments Ltd | Professional & scientific | 2024 |
| Could Ltd | Wholesale & retail | 2025 |
| Coutts Transport Limited | Transport & logistics | 1997 |
| Cove Trade Limited | Wholesale & retail | 2026 |
| Covelopers Ltd | Construction | 2025 |
| Covely Consulting Ltd | Professional & scientific | 2026 |
| Covenant Compliance Trading & Services Ltd | Other services | 2026 |
| Covo Solutions Limited | Information & communication | 2026 |
| Covochi’S Beauty LAB Ltd | Other services | 2021 |
| COX Louise Ltd | Wholesale & retail | 2025 |
| Coyeh Investment Ltd | Financial services | 2025 |
| Cozma Consultants Ltd | Professional & scientific | 2017 |
| Cozy Cleaning Limited | Administrative & support | 2025 |
| Cozy Crate Limited | Wholesale & retail | 2025 |
| Cozy Romford Stay Ltd | Hospitality | 2026 |
| CP104 Ltd | Real estate | 2026 |
| Cpbs Properties Ltd | Real estate | 2023 |
| Cpmt Ltd | Education | 2014 |
| Crabag Ltd | Wholesale & retail | 2026 |
| Craft Solar Ltd | Administrative & support | 2019 |
| Craftbloom Limited | Manufacturing | 2026 |
| Craftech Collective Ltd | Wholesale & retail | 2025 |
| Crafthub Global Limited | Information & communication | 2025 |
| Crafting Room Recordings Ltd | Information & communication | 2025 |
| CRAFTS4CATS Ltd | Manufacturing | 2018 |
| Craig Bird Ltd | Education | 2003 |
| Craig Hackley Limited | Extraterritorial | 2021 |
| Cramdien Trade Ltd | Wholesale & retail | 2026 |
| Crappo Cabodel Ltd | Wholesale & retail | 2025 |
| Crarwnvale Ltd | Manufacturing | 2025 |
| Crazy Traveller Ltd | Administrative & support | 2014 |
| CRC Insulation Solutions Ltd | Manufacturing | 2025 |
| CRE8 ENT Ltd | Manufacturing | 2024 |
| Creaflex Ltd | Wholesale & retail | 2025 |
| Creagh-Barry Limited | Health & social care | 2026 |
| Create and Copy Ltd | Professional & scientific | 2021 |
| Creative Canvas Solutions Ltd | Wholesale & retail | 2026 |
| Creative Canvas Studios Ltd | Wholesale & retail | 2024 |
| Creative Field Studio Limited | Administrative & support | 2018 |
| Creative Infosec Limited | Wholesale & retail | 2013 |
| Creative Neurone Network Ltd | Education | 2022 |
| Creative Productions Holdings Limited | Information & communication | 2018 |
| Creative Writing Club Ltd | Information & communication | 2023 |
| Creatively Clever Limited | Other services | 2014 |
| Creatively Splendid Limited | Wholesale & retail | 2021 |
| Creatives for Culture CIC | Arts & recreation | 2025 |
| Creek Horse Ltd | Wholesale & retail | 2025 |
| Creeq Community Interest Company | Arts & recreation | 2023 |
| Crescendochic Ltd | Wholesale & retail | 2025 |
| Crescent Coldstream Ltd | Wholesale & retail | 2025 |
| Crestville Developments Limited | Real estate | 1998 |
| Crestwell Services Limited | Financial services | 2025 |
| Crexita Limited | Wholesale & retail | 2024 |
| Crib of Frames Ltd | Wholesale & retail | 2023 |
| Crib of Shades Ltd | Wholesale & retail | 2025 |
| Crimewatchers Ltd | Administrative & support | 2020 |
| Crimson Film Limited | Information & communication | 2022 |
| Crisisdna Ltd | Professional & scientific | 2025 |
| Critical Moment Theatre CIC | Arts & recreation | 2021 |
| Cromer Wares Ltd | Wholesale & retail | 2025 |
| Cromford Coffee Company Limited | Manufacturing | 2025 |
| Cross and Corner Limited | Health & social care | 2025 |
| Cross Keys Management Company Limited | Real estate | 2016 |
| Crossaxis Global Ltd | Professional & scientific | 2026 |
| Crossshop Innovations Ltd | Wholesale & retail | 2025 |
| Crossvia Ltd | Wholesale & retail | 2026 |
| Crosswave Trading Ltd | Wholesale & retail | 2025 |
| Crossx Top Ltd | Wholesale & retail | 2025 |
| Crown and Coils Ltd | Wholesale & retail | 2024 |
| Crown Holidays Hub Ltd | Administrative & support | 2026 |
| Crown LIN Limited | Wholesale & retail | 2026 |
| Crown Regatta Club (UK) Ltd | Extraterritorial | 2025 |
| Crownbyte Ltd | Information & communication | 2025 |
| Crownpath Ltd | Financial services | 2026 |
| Crownway Trading Ltd | Real estate | 2025 |
| Crs-Systems Internet Solution and Consulting Ltd | Wholesale & retail | 2019 |
| Crsuyarka Ltd | Wholesale & retail | 2026 |
| CRT Marketing Ltd | Professional & scientific | 2023 |
| Crtv UK Ltd | Administrative & support | 2021 |