| B&W Electronics Ltd | Wholesale & retail | 2025 |
| B&W Smart Repairs Ltd | Other services | 2011 |
| B-Legal Consultancy Limited | Professional & scientific | 2025 |
| B-Life International Ltd | Real estate | 2025 |
| B. Patrick Limited | Transport & logistics | 2022 |
| B.C. Tiling Limited | Construction | 1977 |
| B.R Healthcare Group Limited | Health & social care | 2024 |
| B.T. Wills & Trusts Ltd | Professional & scientific | 2018 |
| B21 Security Ltd | Construction | 2025 |
| B2S Cafe Ltd | Hospitality | 2025 |
| B97 Holding Limited | Financial services | 2019 |
| BA 2006 Ltd | Hospitality | 2025 |
| Baba Sandwich Bar Ltd | Hospitality | 2025 |
| Babbish Limited | Hospitality | 2016 |
| Babsp Ltd | Real estate | 2024 |
| Babworth Road Property Management Limited | Households | 2007 |
| Bacca | Other services | 2018 |
| Back on Track Accommodation Limited | Hospitality | 2017 |
| Backlot Ltd | Arts & recreation | 2021 |
| Bacorn Grill Ltd | Hospitality | 2025 |
| BACUS88 Ltd | Transport & logistics | 2017 |
| BAD ASS Baboon Group Ltd | Manufacturing | 2020 |
| BAD Wolf Tattoo Club Ltd. | Other services | 2022 |
| Badawa Ltd | Other services | 2024 |
| Badgers Estates Limited | Professional & scientific | 2024 |
| Badh & Sons Ltd | Real estate | 2020 |
| Badmofo Limited | Wholesale & retail | 2020 |
| Bagrian Transport Ltd | Transport & logistics | 2025 |
| Bags I Ltd | Wholesale & retail | 2021 |
| Bags Suspension Ltd | Wholesale & retail | 2020 |
| Bahay Ltd | Real estate | 2024 |
| Bahram Construction Ltd | Real estate | 2025 |
| Bail Rigg Properties Ltd | Real estate | 2023 |
| Bailey Rimmington TM Ltd | Public administration | 2025 |
| Bailey's Cleaning Services Ltd | Administrative & support | 2025 |
| Bailey's Emporium Ltd | Extraterritorial | 2020 |
| Baileys WFP Systems Limited | Wholesale & retail | 2016 |
| Bailgate Books Limited | Wholesale & retail | 2004 |
| Baines Simmons Limited | Administrative & support | 2001 |
| BAK247 Services Ltd | Wholesale & retail | 2024 |
| Bake Bake Limited | Hospitality | 2019 |
| Bake Battle Roll CIC | Wholesale & retail | 2025 |
| Baker Bars Limited | Hospitality | 2025 |
| Baker Boys (Donc) Ltd | Real estate | 2004 |
| Baker OLE Solutions Limited | Professional & scientific | 2013 |
| Baker Stevens 2 Ltd | Real estate | 2025 |
| Baker Stevens Holdings Ltd | Financial services | 2026 |
| Baker Stevens Ltd | Real estate | 2020 |
| BAKER5 Property Limited | Real estate | 2026 |
| Bakermann Group Ltd | Information & communication | 2022 |
| Bakkar Limited | Extraterritorial | 2014 |
| Bakle Decorators Limited | Construction | 2024 |
| Bala JII Limited | Wholesale & retail | 2024 |
| Balaban Limited | Hospitality | 2018 |
| Balaji Sweets Ltd | Hospitality | 2025 |
| Balanced Life Counselling Ltd | Health & social care | 2025 |
| Balby Care and Home Services Ltd | Health & social care | 2014 |
| Balby Carpet Centre Limited | Wholesale & retail | 2003 |
| Balby Community Library | Arts & recreation | 2012 |
| Balby Court Limited | Real estate | 2018 |
| Balby Court Partnership Limited | Hospitality | 2025 |
| Balby Electric Company Limited | Manufacturing | 1989 |
| Balby Rhino's Ltd | Hospitality | 2016 |
| Balby Store Limited | Wholesale & retail | 2023 |
| Baldur Limited | Extraterritorial | 1993 |
| Bales & Sons Ltd | Real estate | 2020 |
| Balkan Authentic Food 1 Ltd | Hospitality | 2025 |
| Balkenende Coenen Advocaten LLP | | 2013 |
| Ballam Brass Ltd | Arts & recreation | 2025 |
| Ballin Enterprises Ltd | Real estate | 2018 |
| Ballycraigy UK Properties Limited | Real estate | 2013 |
| Ballyvesey Holdings Limited | Financial services | 1995 |
| Ballyvesey Industries Limited | Professional & scientific | 2019 |
| Ballyvesey Properties Limited | Professional & scientific | 2019 |
| Balmer Recruitment Group Ltd | Administrative & support | 2025 |
| Balti Palace Denby Ltd | Hospitality | 2025 |
| Baltic Works Sheffield Ltd | Real estate | 2018 |
| Baltyk Plus Ltd | Wholesale & retail | 2025 |
| BAM LDN Ltd | Professional & scientific | 2022 |
| Bamboo Rocks Ltd | Wholesale & retail | 2024 |
| Bamonte Artist Management Ltd | Arts & recreation | 2005 |
| BAN Security Limited | Administrative & support | 2016 |
| Bana Beauty Limited | Other services | 2025 |
| Bana Mini Market Limited | Wholesale & retail | 2025 |
| Bana Mini Store Limited | Wholesale & retail | 2025 |
| Bando Barbers Ltd | Other services | 2020 |
| Bangaveragepubs Ltd | Hospitality | 2026 |
| Banh BAO Nails 2001 Ltd | Other services | 2025 |
| Banks Consultants Limited | Construction | 2008 |
| Bankwood Holdings Ltd | Extraterritorial | 2019 |
| Bankwood Meats Holdings Limited | Financial services | 2019 |
| Bankwood Meats Limited | Manufacturing | 2004 |
| Bankwood Meats Trustee Limited | Other services | 2025 |
| Banx Ltd | Extraterritorial | 2026 |
| BAO Contracts Ltd | Extraterritorial | 2020 |
| Bapp Industrial Supplies (Doncaster) Limited | Manufacturing | 1989 |
| Barakeepizza Ltd | Hospitality | 2025 |
| Baran Burger Limited | Hospitality | 2024 |
| Barasti Limited | Wholesale & retail | 2017 |
| Barbara Cattle Limited | Wholesale & retail | 1971 |