| Brero Ltd | Real estate | 2026 |
| Brick Boxes Ltd | Real estate | 2014 |
| Brick Clean UK Ltd | Other services | 2022 |
| Brick on the River Ltd | Hospitality | 2017 |
| Brickgraph Limited | Information & communication | 2022 |
| Bridgesol Ltd | Wholesale & retail | 2024 |
| Bright Buds Collective Ltd | Education | 2025 |
| Bright Education Alliance Ltd | Education | 2021 |
| Bright Housing Ltd | Real estate | 2023 |
| Bright News Limited | Administrative & support | 2021 |
| Bright Space Cheshunt Limited | Real estate | 2023 |
| Bright Space Co Work Limited | Real estate | 2023 |
| Bright Sparks Pre-School and OUT of School Club Limited | Health & social care | 2018 |
| Brightside Carpentry Limited | Manufacturing | 2017 |
| Brightstone Property Care Ltd | Transport & logistics | 2026 |
| Brimson Media Ltd | Information & communication | 2010 |
| Britaniashield Limited | Transport & logistics | 1997 |
| British Heritage Limited | Information & communication | 2000 |
| Britline Fibre Ltd | Construction | 2026 |
| BRJ Automotive Ltd | Wholesale & retail | 2026 |
| BRJ Real Estate Ltd | Real estate | 2025 |
| Brook Case Limited | Other services | 2025 |
| Brooke Investments Ltd | Construction | 2021 |
| Brookfield Flats Limited | Real estate | 2013 |
| Brookline Sports Advisory Limited | Professional & scientific | 2025 |
| Broosterz UK Ltd | Hospitality | 2024 |
| Browz Limited | Other services | 2014 |
| Broxbourne Borough Youth Limited | Other services | 2012 |
| Broxbourne Environmental Services Trading Limited | Water & waste | 2018 |
| Broxbourne S C Limited | Arts & recreation | 2023 |
| Brps Patel Ltd | Real estate | 2026 |
| Brufer Properties & Co. Ltd | Real estate | 2025 |
| Brute Force Fitness Ltd | Manufacturing | 2024 |
| Brylee Healthcare Ltd | Administrative & support | 2019 |
| Bsherie Ltd | Wholesale & retail | 2023 |
| Bubba Investments Ltd | Financial services | 2022 |
| Bubble Resources Limited | Construction | 2013 |
| Bubu Limited | Other services | 2020 |
| Buckland & Armstrong Limited | Administrative & support | 2024 |
| Buildfuture Holdings Ltd | Financial services | 2026 |
| Building Services 4U Ltd | Construction | 2018 |
| Buildmoat Ltd | Information & communication | 2026 |
| Buildwright Contractors Ltd | Construction | 2026 |
| Bulfusion Ltd | Wholesale & retail | 2025 |
| Bureau of Extraordinary Affairs Ltd | Arts & recreation | 2016 |
| Burgeon Facilities Management Limited | Administrative & support | 2025 |
| Burns Road (Melbourne) Management Company Limited | Households | 2014 |
| Bushby Building (UK) Ltd | Other services | 2014 |
| Bushpenpiz Ltd | Real estate | 2024 |
| Businessconnect Practice Limited | Real estate | 2014 |
| Bustaurant Limited | Transport & logistics | 2020 |
| Busu Projects Ltd | Construction | 2025 |
| Butterflies Child & Baby Care Services Limited | Health & social care | 2011 |
| Bvhaus Ltd | Real estate | 2025 |
| BY Estates Limited | Real estate | 2014 |
| BY Sephora Ltd | Other services | 2024 |
| BY Sindy Ltd | Wholesale & retail | 2020 |
| BYM Holdings Ltd | Administrative & support | 2016 |
| BYM Letting NO 14 Limited | Real estate | 2020 |
| BYM Lettings NO 4 Limited | Real estate | 2019 |
| Byron Investments Enfield Limited | Real estate | 2022 |
| C and K Estates Management Ltd | Households | 2025 |
| C M DOE Lighting Limited | Construction | 2018 |
| C P Bathrooms Limited | Wholesale & retail | 2025 |
| C T & L Holdings Ltd | Real estate | 2025 |
| C W Lewis Electrical Services Ltd | Construction | 2013 |
| C W Lewis Services Ltd | Construction | 2019 |
| C&A Movement Ltd | Professional & scientific | 2021 |
| C&D Bookkeeping Ltd | Professional & scientific | 2018 |
| C&M Marketing Ltd | Professional & scientific | 2025 |
| C.E.L Group (1989) Limited | Construction | 2020 |
| C.M.G. Investments Limited | Real estate | 1990 |
| C.On Group Ltd | Transport & logistics | 2023 |
| C.Onetwenty Ltd | Wholesale & retail | 2013 |
| C.U.70 Ltd | Construction | 2015 |
| C2G Wealth Management Ltd | Financial services | 2019 |
| CA Hair Limited | Other services | 2025 |
| Cablecom Limited | Information & communication | 2022 |
| Cabletech Communications Limited | Information & communication | 2012 |
| Caesar Housing Care Ltd | Real estate | 2023 |
| Caesar Housing CIC | Health & social care | 2023 |
| Caesium Solutions Ltd | Professional & scientific | 2017 |
| Cafe Aydin Limited | Hospitality | 2022 |
| Cafe Cooks Ltd | Hospitality | 2006 |
| Cafe MRT Limited | Hospitality | 2026 |
| Caffe Juma Ltd | Hospitality | 2025 |
| Cagatay Property Ltd | Real estate | 2026 |
| Cake Baker Ltd | Wholesale & retail | 2022 |
| Caldecot Consultancy Limited | Transport & logistics | 2017 |
| Call Thru Care Ltd | Administrative & support | 2024 |
| Calltracks Limited | Information & communication | 2008 |
| Calypso Travel Limited | Administrative & support | 1996 |
| CAM Caddie Ltd | Wholesale & retail | 2015 |
| Campovan Ltd | Hospitality | 2025 |
| Canary Wharf Gunes Limited | Hospitality | 2025 |
| Canbek Estates Ltd | Real estate | 2026 |
| Canfud Trading Limited | Other services | 2021 |
| Cani Plastering Ltd | Construction | 2023 |
| Cankies Limited | Information & communication | 2022 |
| Cannon Travel Limited | Administrative & support | 1991 |