| Blackthorn Design & Build Ltd | Construction | 2023 |
| Blended AI Education Limited | Information & communication | 2026 |
| Blue Cube Fabrications Ltd | Manufacturing | 2010 |
| Blue Cube Property Ltd | Construction | 2023 |
| Blue MAY Jewellery Ltd | Wholesale & retail | 2025 |
| Blue Sword Construction Ltd | Construction | 1996 |
| Bluecoat Strategies Limited | Real estate | 2014 |
| Blueprint Property Portfolio Limited | Construction | 2025 |
| Bo-Peep's Nursery Limited | Health & social care | 2006 |
| BOE Ltd | Professional & scientific | 2011 |
| Bonjour London Ltd | Professional & scientific | 2014 |
| Book My NVQ Ltd | Construction | 2019 |
| Born 23 Ltd | Professional & scientific | 2025 |
| Bowers Broker Services Limited | Financial services | 2025 |
| Brae LEA Financial Limited | Professional & scientific | 2016 |
| Bramley Business Services Limited | Professional & scientific | 2003 |
| Bramley Management Limited | Professional & scientific | 2003 |
| Bramley Osteopaths Limited | Health & social care | 2014 |
| Bramley Wireless Solutions Limited | Information & communication | 2009 |
| Brandarrow Enterprises Ltd | Professional & scientific | 2025 |
| Brandsformers Limited | Professional & scientific | 2025 |
| Brightview 360 Limited | Information & communication | 2026 |
| Bristol Concrete Studio Ltd | Manufacturing | 2020 |
| Bristow Associates (UK) Limited | Information & communication | 2015 |
| Bristow Associates Property Limited | Real estate | 2018 |
| Broadcast Innovation Ltd | Information & communication | 2001 |
| Brolen Property Ltd | Real estate | 2023 |
| Brookson (5812C) Limited | Professional & scientific | 2007 |
| Brothers Capital Ltd | Real estate | 2025 |
| Brothers Cove Film Ltd | Information & communication | 2025 |
| Brothers Hub Ltd | Wholesale & retail | 2026 |
| Brownlie Property Rentals Limited | Households | 2023 |
| Build Your Own Drone Limited | Wholesale & retail | 2012 |
| Building&Beauty Limited | Administrative & support | 2012 |
| Bulley's Ground Maintenance Limited | Financial services | 2022 |
| Bullit Logistics Ltd | Transport & logistics | 2020 |
| Business Insights & Accounting Solutions Ltd | Information & communication | 2020 |
| Butlers Carpentry Limited | Manufacturing | 2016 |
| BUZ Creative Landscapes Limited | Administrative & support | 2009 |
| Buzzards Apparel Limited | Manufacturing | 2017 |
| Bytz Limited | Information & communication | 2017 |
| C & L Self Storage Limited | Transport & logistics | 2008 |
| C & M Accounts Payroll & Secretarial Services Ltd | Professional & scientific | 2003 |
| C & P Sipp - F. Motamed Limited | Real estate | 2012 |
| C & R Tree Care & Garden Services Ltd | Agriculture & fishing | 2025 |
| C Best Groundworks Ltd | Construction | 2018 |
| C.A. Renos & Build Ltd | Construction | 2025 |
| C.Splat Consulting Ltd | Financial services | 2010 |
| Cable Safe Solutions Ltd | Wholesale & retail | 2025 |
| CAJ Consultancy Limited | Professional & scientific | 2023 |
| Calleva Building Services Ltd | Construction | 2015 |
| Cani-Care Limited | Other services | 2019 |
| Capita Consulting Ltd | Professional & scientific | 2025 |
| Carbenergy Systems Limited | Professional & scientific | 2020 |
| Carbon Path Ltd | Professional & scientific | 2025 |
| Care Connect & Enable Ltd | Health & social care | 2023 |
| Care Counselling Ltd | Health & social care | 2019 |
| Cargate Freehold Ltd | Households | 2023 |
| Carmmercial Solutions Ltd | Wholesale & retail | 2018 |
| Carping Cooper Ltd | Hospitality | 2018 |
| Cartiller Ltd | Wholesale & retail | 2021 |
| Casson's the English Herb Company Limited | Extraterritorial | 2010 |
| Catherine Blades Bridal Ltd. | Manufacturing | 2011 |
| Centre for Sustainability Accounting | Professional & scientific | 2020 |
| Centuramedia Ltd | Professional & scientific | 2023 |
| CFS Renovations and Repairs Limited | Construction | 2026 |
| CGC Homes Limited | Construction | 2016 |
| CGS Pools Ltd | Construction | 2022 |
| Chambers Residential Estates Limited | Real estate | 2026 |
| Champshire Homes Ltd | Construction | 2024 |
| Chance Holdings Limited | Arts & recreation | 1980 |
| Chapman Building & Design Limited | Construction | 2019 |
| Chappell Building Services Limited | Construction | 2003 |
| Character and Co. Limited | Other services | 2016 |
| Chez SAL Ltd | Arts & recreation | 2018 |
| Chivers People & Change Ltd | Professional & scientific | 2023 |
| Chusan Services Ltd | Professional & scientific | 2025 |
| Clear Perfection Window Cleaning Ltd | Administrative & support | 2021 |
| Clearxperts International Limited | Professional & scientific | 2007 |
| Climate Champions CIC | Professional & scientific | 2025 |
| Clinchmaritime Limited | Professional & scientific | 2018 |
| Clinical Training Solutions Ltd | Public administration | 2018 |
| Cloud Layer Ltd | Wholesale & retail | 2025 |
| Cloudbase Property Limited | Real estate | 2017 |
| Clydesdale Pharma Ltd | Wholesale & retail | 2019 |
| CMA Financial Ltd | Professional & scientific | 2024 |
| CMA Group Limited | Professional & scientific | 2019 |
| CMJ Automotive Ltd | Wholesale & retail | 2021 |
| Cods & Rockers Events & Catering Ltd | Hospitality | 2018 |
| Colledge Group Ltd | Administrative & support | 2026 |
| Compact Garage Doors Ltd | Manufacturing | 2021 |
| Consulting Engineers Ltd | Construction | 2025 |
| Cooke Components Ltd | Wholesale & retail | 2012 |
| Coolio Trading Ltd | Hospitality | 2025 |
| Cooper Film-Props Ltd | Information & communication | 2013 |
| Coppards Limited | Administrative & support | 1988 |
| Copper & Card Limited | Other services | 2018 |
| Cosmos Business Holdings Limited | Financial services | 2020 |
| Cotech Technology Limited | Professional & scientific | 1989 |
| Cotty Tree Surgery Ltd | Administrative & support | 2021 |