| BH Woodland Holdings Ltd | Financial services | 2024 |
| BHC Payroll Ltd | Administrative & support | 2024 |
| Bhenito Limited | Information & communication | 2022 |
| BHF Landscaping Limited | Administrative & support | 2010 |
| BHP Sports & Prestige Ltd | Wholesale & retail | 2018 |
| BHX Holdings Ltd | Arts & recreation | 2026 |
| Biarri Networks UK Limited | Professional & scientific | 2022 |
| BIC Marketing Ltd | Wholesale & retail | 2020 |
| Bickhel Ltd | Information & communication | 2023 |
| Bico Beauty Limited | Other services | 2024 |
| Bicycle Buddy Limited | Other services | 2022 |
| Bielan-Trans Ltd | Transport & logistics | 2016 |
| Bifam Limited | Wholesale & retail | 2019 |
| Big Boss Capital Limited | Financial services | 2020 |
| Big Brain Racing Ltd | Arts & recreation | 2022 |
| Big Data Dynamics Ltd | Information & communication | 2020 |
| Big Island Holdings Limited | Professional & scientific | 2020 |
| Big NED Limited | Professional & scientific | 2024 |
| Big on Tyres Limited | Wholesale & retail | 2017 |
| Big Red Robe Ltd | Professional & scientific | 2022 |
| Big Shade Limited | Wholesale & retail | 2023 |
| Big Sky Accounting Limited | Professional & scientific | 2014 |
| Big Strong Love Limited | Administrative & support | 2004 |
| Big Top Scaffolding Solutions Ltd | Construction | 2023 |
| Big Trigs Wellness and CBD Center Ltd | Wholesale & retail | 2026 |
| Big Wangers Inc. Ltd | Information & communication | 2018 |
| Big Y Events Community Interest Company | Hospitality | 2025 |
| BIG1TRUCK Ltd | Transport & logistics | 2013 |
| Bigadan UK Limited | Construction | 2015 |
| Bigben Digital Limited | Information & communication | 2025 |
| Bijke Ltd | Professional & scientific | 2025 |
| Bike Clinic Limited | Manufacturing | 2018 |
| Bike House 10 Limited | Manufacturing | 2024 |
| Bike Pedlars (Retford) Limited | Wholesale & retail | 2012 |
| Billann Ltd | Extraterritorial | 2021 |
| BILLHENSTORES2064 Ltd | Wholesale & retail | 2025 |
| Billie's Agricultural Enterprise Limited | Information & communication | 2022 |
| Billingley Christmas Trees Limited | Wholesale & retail | 2004 |
| Bilso Ltd | Transport & logistics | 2014 |
| Bilton Jeans Ltd | Arts & recreation | 2008 |
| Bingham & Young Optics Ltd | Health & social care | 2023 |
| Bingham Building & Landscaping Services Ltd | Construction | 2015 |
| Bingham Carpets Ltd. | Wholesale & retail | 1999 |
| Bingham Property (Wentdale) Limited | Real estate | 2011 |
| Bintakay Limited | Wholesale & retail | 2021 |
| Biomend Ltd | Health & social care | 2026 |
| Biophilic Funeral Centres Ltd | Other services | 2023 |
| Biowise Limited | Water & waste | 2001 |
| BIP Network Logistics Ltd | Transport & logistics | 2021 |
| Birch Enterprises Ltd | Administrative & support | 2023 |
| Birch LEA Properties Limited | Real estate | 2024 |
| Birch Mortgage & Financial Solutions Limited | Financial services | 2014 |
| Birchwood Property Investments Limited | Real estate | 1998 |
| Bircotes and Harworth Sports and Social Club Limited | Hospitality | 2009 |
| Bircotes Consult Limited | Health & social care | 2019 |
| Bird & Badger Inns Ltd | Hospitality | 2016 |
| Bird Heating and Interiors Ltd | Construction | 2024 |
| Bird Noise Ltd | Arts & recreation | 2012 |
| Birding Abroad Limited | Arts & recreation | 2015 |
| Birdwing Design Limited | Professional & scientific | 2005 |
| BIS Transport Limited | Transport & logistics | 2017 |
| Biscuit Billy's Limited | Hospitality | 2019 |
| Bishop & Co. Limited | Professional & scientific | 1987 |
| Bishop Accountants Limited | Professional & scientific | 2009 |
| Bishopp PR Limited | Other services | 2025 |
| Bishops Croft (Sandal) Management Company Limited | Real estate | 2009 |
| Bishopsville Limited | Information & communication | 2019 |
| Bismight Shipping and Cargo Solutions Ltd | Transport & logistics | 2025 |
| Bitechen Ltd | Information & communication | 2025 |
| Bitmez Estate Limited | Real estate | 2024 |
| Bitumexpo Ltd | Construction | 2025 |
| Bizintegrate Limited | Information & communication | 2014 |
| Bizmaint Ltd | Other services | 2025 |
| BJB TM Limited | Construction | 2025 |
| BJL RIG Access Limited | Construction | 2015 |
| BJN Mobile Mechanic Ltd | Wholesale & retail | 2026 |
| BJS Inspection Services Ltd | Professional & scientific | 2006 |
| BK Scotswood LLP | | 2011 |
| BKH Property Limited | Real estate | 2023 |
| BKV Commerce Ltd | Information & communication | 2025 |
| Black Bull (Waugh) Limited | Hospitality | 2013 |
| Black Cat Bidco Limited | Professional & scientific | 2008 |
| Black Diamond Investments | | 2009 |
| Black Diamond Nominee Limited | Real estate | 2009 |
| Black Diamond Security Ltd | Administrative & support | 2010 |
| Black Donny Ltd | Administrative & support | 2024 |
| Black FOX Ltd | Wholesale & retail | 2024 |
| Black Giraffe Solutions Ltd | Professional & scientific | 2025 |
| Black HVS Limited | Construction | 2018 |
| Black Oak Engineering Ltd | Professional & scientific | 2025 |
| Black Peak Trading Ltd | Wholesale & retail | 2018 |
| Black Pearl Investments LP | | 2009 |
| Black Rose Construction Limited | Construction | 2019 |
| Black Swan Court Management Co Limited | Households | 1997 |
| Blackett Aviation Consulting Limited | Professional & scientific | 2014 |
| Blackout Hot Yoga Ltd | Arts & recreation | 2025 |
| Blackroute Services Limited | Transport & logistics | 2026 |
| Blackstar Property Group Ltd | Construction | 2023 |
| Blackstone Care Services Ltd | Health & social care | 2019 |
| Blackstone Legal Costing UK Limited | Professional & scientific | 2012 |