| BIA Planet Ltd | Wholesale & retail | 2017 |
| BIA Site Services Ltd | Construction | 2025 |
| Biafra Liaison UK Ltd | Education | 2024 |
| Biamore Limited | Wholesale & retail | 2021 |
| Bianca Cleaning Limited | Administrative & support | 2024 |
| Biash Logistics Ltd | Wholesale & retail | 2023 |
| BIB Bakehouse 2 Ltd | Hospitality | 2023 |
| BIB Bakehouse 3 Ltd | Hospitality | 2024 |
| BIB Bakehouse 4 Ltd | Hospitality | 2024 |
| BIB Bakehouse JQ Ltd | Hospitality | 2024 |
| Biba Properties Limited | Real estate | 2025 |
| Bibi Avenue Limited | Professional & scientific | 2020 |
| Bibi Property Investments Ltd | Real estate | 2024 |
| Bibis Central Kitchen Limited | Hospitality | 2024 |
| Bibis D SQ Limited | Hospitality | 2023 |
| Bibis Fabrication Ltd | Construction | 2019 |
| BIC Cabling Solutions (UK) Limited | Construction | 2010 |
| Bicamp UK CIC | Health & social care | 2024 |
| Bick Holdings Limited | Real estate | 2020 |
| Bickerton Audio Limited | Professional & scientific | 2026 |
| Bickley & Hill Hook Management Ltd | Extraterritorial | 2007 |
| Bickley House RTM Company Limited | Real estate | 2006 |
| Bicknells Jewellers Limited | Manufacturing | 1979 |
| Bicycle Adventure Club CIC | Arts & recreation | 2023 |
| BID US Investors Limited | Arts & recreation | 2025 |
| Bida Trans Limited | Transport & logistics | 2017 |
| Bidaai Wedding Service Ltd | Transport & logistics | 2016 |
| Bidbase Software Limited | Information & communication | 2023 |
| Bidder Group Limited | Construction | 2017 |
| Biddlebrothers Ltd | Real estate | 2025 |
| Biddleston Limited | Transport & logistics | 2016 |
| Bidell & Webb Ltd | Real estate | 2026 |
| Bidg Construction and Design Ltd | Construction | 2019 |
| Bidonea&Maya Ltd | Transport & logistics | 2023 |
| Bidston Court Management Company Limited | Real estate | 1991 |
| Bies OS Limited | Transport & logistics | 2018 |
| Big B Brands PVT Ltd | Wholesale & retail | 2024 |
| Big B Legal Limited | Administrative & support | 2025 |
| Big B Transport Ltd | Transport & logistics | 2020 |
| Big Bang Prospects (the Hope Hub) CIC | Education | 2021 |
| Big Blessings Ltd | Wholesale & retail | 2015 |
| Big Blue F&C Limited | Wholesale & retail | 2024 |
| Big Boss Constructions Ltd | Construction | 2015 |
| Big Box Trader Ltd | Hospitality | 2018 |
| Big Brothers Club Ltd | Other services | 2025 |
| Big Brum (Theatre in Education) Company Limited | Arts & recreation | 1983 |
| Big Brum Retail Limited | Wholesale & retail | 2018 |
| Big Button Holdings Limited | Financial services | 2017 |
| Big Button Media Limited | Information & communication | 2001 |
| Big Chicken Ltd | Hospitality | 2015 |
| Big Chicken Peri Peri Ltd | Hospitality | 2022 |
| Big City Builders Ltd | Construction | 2023 |
| Big City Recruitment Limited | Hospitality | 2016 |
| Big Clearance Ltd | Wholesale & retail | 2026 |
| Big CV Healthcare Ltd | Health & social care | 2022 |
| Big Daddy Ltd | Wholesale & retail | 2022 |
| Big Dave CIC | Education | 2016 |
| Big Distribution Limited | Wholesale & retail | 2020 |
| Big Eight 88 Ltd | Hospitality | 2023 |
| Big Events Birmingham Ltd | Other services | 2015 |
| Big FAT Slab Ltd | Manufacturing | 2017 |
| Big Fryer Limited | Hospitality | 2008 |
| Big G Consulting Limited | Professional & scientific | 2025 |
| Big Green Coach Holding Limited | Financial services | 2026 |
| Big Green Coach Limited | Transport & logistics | 2009 |
| Big Green Transport Limited | Administrative & support | 2011 |
| Big Guns Live Limited | Arts & recreation | 2014 |
| Big Holiday House Limited | Professional & scientific | 2006 |
| Big Immersion Group Ltd | Hospitality | 2026 |
| Big Johns Payroll Limited | Administrative & support | 2019 |
| Big L Limited | Information & communication | 2005 |
| Big Love Productions Ltd | Administrative & support | 2015 |
| Big MAN Flow Logistics Limited | Transport & logistics | 2025 |
| Big MO Entertainment Ltd | Arts & recreation | 2026 |
| Big Mummas Limited | Hospitality | 2025 |
| Big Munch Birmingham Ltd | Wholesale & retail | 2015 |
| Big on Beds Ltd | Other services | 2018 |
| Big on Time Ltd | Manufacturing | 2019 |
| Big Party Ltd | Wholesale & retail | 2026 |
| Big Picture Consultancy Ltd | Administrative & support | 2011 |
| Big Planning Limited | Administrative & support | 2014 |
| Big POT Ltd | Wholesale & retail | 2021 |
| Big Property Assets Ltd | Real estate | 2019 |
| Big Property Construction Ltd | Construction | 2025 |
| Big Property Investments Ltd | Real estate | 2019 |
| Big Red Marketing Ltd | Professional & scientific | 2020 |
| Big SAJ Handsworth Ltd | Hospitality | 2024 |
| Big SAJ Rookery Road Ltd | Hospitality | 2026 |
| Big SAJ Smethwick Ltd | Hospitality | 2024 |
| Big Security Trustee Limited | Professional & scientific | 2021 |
| Big Shot Snooker Ltd | Arts & recreation | 2022 |
| Big Softies Ltd | Extraterritorial | 2022 |
| Big Star Products Ltd | Wholesale & retail | 2018 |
| Big Stars Limited | Hospitality | 2019 |
| Big Strides Consulting Ltd | Professional & scientific | 2009 |
| Big Strides Ltd | Manufacturing | 2020 |
| Big SUR (High Street) Limited | Construction | 2018 |
| Big T'S Chippy Ltd. | Hospitality | 2015 |
| Big Texas Group Ltd | Manufacturing | 2025 |
| Big Top Decor Ltd | Arts & recreation | 2015 |