| Burr Street MOT Centre Limited | Wholesale & retail | 2014 |
| Burrito Bear Burton Ltd | Hospitality | 2021 |
| Burton Brothers Builders Limited | Construction | 2026 |
| Burton Design & Build Ltd | Construction | 2022 |
| Bury Park Business Forum Limited | Other services | 2023 |
| Bury Park Coffee House Ltd | Hospitality | 2018 |
| Business Consultancy Group UK Ltd | Information & communication | 2022 |
| Business Lifeline Limited | Professional & scientific | 2005 |
| Business Present Limited | Wholesale & retail | 2010 |
| Business Promoters Ltd | Other services | 2018 |
| Business Property Solutions Limited | Real estate | 2016 |
| Business Solution Tycoon Ltd | Wholesale & retail | 2025 |
| Business Star Ltd | Professional & scientific | 2020 |
| Busmit Ltd | Wholesale & retail | 2023 |
| Busy Bear Ltd | Wholesale & retail | 2025 |
| Bute Street Film Festival Ltd | Arts & recreation | 2017 |
| Bute Street Projects CIC | Education | 2023 |
| Bute Trading Limited | Hospitality | 2013 |
| Butlers Walsall Ltd | Real estate | 2008 |
| Buttco Group Limited | Wholesale & retail | 2022 |
| Butterfly Apartments Ltd | Real estate | 2024 |
| Butterfly Funerals Limited | Other services | 2014 |
| Butterfly Paving Ltd | Administrative & support | 2020 |
| Buttons Supply Ltd | Wholesale & retail | 2025 |
| Buxton Road Management Limited | Real estate | 2004 |
| Buy and Rent Supper Fast Limited | Real estate | 2026 |
| Buy Limited | Real estate | 1999 |
| Buybox Bros Ltd | Wholesale & retail | 2025 |
| Buyers AID Ltd | Wholesale & retail | 2026 |
| Buyvista Mart Ltd | Wholesale & retail | 2026 |
| Buyzone Global Limited | Wholesale & retail | 2025 |
| Buzzix Media Limited | Wholesale & retail | 2024 |
| BVM Corporate Relocation Ltd | Hospitality | 2024 |
| BW Homes Solutions Ltd | Real estate | 2024 |
| BW Rehman Investments Ltd | Real estate | 2026 |
| BWC - Business Work Consulting UK Limited | Information & communication | 2007 |
| BWC General Builders Ltd | Construction | 2025 |
| BY Fuel Solutions Ltd | Transport & logistics | 2025 |
| BY Gods Grace Limited | Professional & scientific | 2022 |
| BY Naya Ltd | Wholesale & retail | 2025 |
| By.Bubu Ltd | Transport & logistics | 2024 |
| Bylands House (Redbourn) Management Limited | Households | 1999 |
| Byline Social Media Co Limited | Manufacturing | 2026 |
| Bynary Limited | Wholesale & retail | 2024 |
| BYS Records Ltd | Information & communication | 2025 |
| Bytecrafter Services Ltd | Wholesale & retail | 2026 |
| Byteignite Limited | Information & communication | 2013 |
| Bytyci Construction Ltd | Construction | 2017 |
| Bytyci Plastering Ltd | Construction | 2023 |
| BZ Auto's and Tyres Limited | Other services | 2022 |
| BZ Emporium Ltd | Wholesale & retail | 2024 |
| BZ Mechanics Limited | Other services | 2016 |
| Bzzar Trading Ltd | Wholesale & retail | 2021 |
| C & G Construction Academy Ltd | Education | 2025 |
| C & G Construction College Ltd Ltd | Construction | 2019 |
| C & G Fixing Ltd | Construction | 2011 |
| C & G Plastering Academy Ltd | Education | 2013 |
| C & I Trans Company Limited | Transport & logistics | 2025 |
| C & Y Art House Ltd | Education | 2025 |
| C a Waters Ltd | Construction | 2022 |
| C and B Property Holdings Limited | Real estate | 2025 |
| C and J Utility Services Ltd | Construction | 2021 |
| C Asofiei Construct Limited | Construction | 2019 |
| C B a Partnership Limited | Professional & scientific | 2009 |
| C Bridge Ltd | Professional & scientific | 2025 |
| C E C Services (UK) Ltd | Health & social care | 2018 |
| C Hamilton Properties Ltd | Real estate | 2022 |
| C M Autos Repair Ltd | Wholesale & retail | 2024 |
| C N M Consultancy Limited | Administrative & support | 2015 |
| C Napper Electrical Limited | Construction | 2024 |
| C Nyati Limited | Transport & logistics | 2024 |
| C P Transport Services Ltd | Transport & logistics | 2019 |
| C Sharp Logistics Ltd | Transport & logistics | 2016 |
| C&A Logistic Solutions Ltd | Transport & logistics | 2020 |
| C&A Probuilders Ltd | Construction | 2022 |
| C&C Digital Limited | Information & communication | 2025 |
| C&C Luton Ltd | Other services | 2018 |
| C&D Building Compliance Testing Ltd | Professional & scientific | 2025 |
| C&E Brothers Limited | Transport & logistics | 2024 |
| C&E Capital Ltd | Real estate | 2026 |
| C&F Courier Services Ltd | Transport & logistics | 2022 |
| C&G International Limited | Construction | 2019 |
| C&P Exclusive Ltd | Real estate | 2017 |
| C&P Logistic Solutions Ltd | Transport & logistics | 2023 |
| C&R Foods Ltd | Hospitality | 2025 |
| C&R Tiling Limited | Construction | 2017 |
| C&S Projects Ltd | Construction | 2023 |
| C&V Drylining Limited | Construction | 2015 |
| C. & S. Dumpleton Limited | Extraterritorial | 1993 |
| C.E.W. Forklift Training Limited | Education | 2005 |
| C.L.J. Enterprises Limited | Real estate | 2007 |
| C.M.M. Development Contractors Ltd | Construction | 2006 |
| C.P.S. Contract Property Services Limited | Real estate | 1998 |
| C.R.H.Welding Limited | Professional & scientific | 2017 |
| C.W.Sampford Property Limited | Real estate | 2021 |
| C2R Green Limited | Agriculture & fishing | 2023 |
| C4U Care Ltd | Health & social care | 2025 |
| C6 Carbon Design Limited | Wholesale & retail | 2017 |
| CA Dobre Development Ltd | Construction | 2024 |
| Ca-Sa-Miyahstays Ltd | Real estate | 2025 |