| Barke Properties Limited | Real estate | 2021 |
| Barke Scaffolding Ltd | Construction | 2018 |
| Barker and Associates Party Wall Surveys Ltd | Construction | 2018 |
| Barker Gotelee LLP | | 2016 |
| Barker Gotelee Trust Corporation Limited | Administrative & support | 2023 |
| Barking Engineering Ltd | Manufacturing | 2020 |
| Barley Vale (Framlingham) Management Company Limited | Households | 2019 |
| Barleyfields (Debenham) Management Company Limited | Households | 2023 |
| Barlow & Company Limited | Administrative & support | 1999 |
| Barnard Memorials Limited | Other services | 2012 |
| Barneco Electrical Ltd | Construction | 2019 |
| Barnes Construction Limited | Professional & scientific | 1990 |
| Barnes Plant Limited | Extraterritorial | 1983 |
| Barnett and SON Limited | Construction | 2008 |
| Barnette Studio Limited | Other services | 2014 |
| Barnhill Care Services Ltd | Health & social care | 2015 |
| Barns to Homes Limited | Construction | 2010 |
| Barnstone Construction Limited | Construction | 2009 |
| Baronas Construction Ltd | Construction | 2023 |
| Baroni Supplier Ltd | Wholesale & retail | 2024 |
| Barony Holdings Limited | Real estate | 2015 |
| Barpath Ltd | Wholesale & retail | 2026 |
| Barr Personnel Limited | Administrative & support | 2013 |
| Barrack ROW Ltd | Real estate | 2026 |
| Barridge Building Contractors Ltd | Construction | 2023 |
| Barrow Care Service Ltd | Health & social care | 2023 |
| Barry Hood Farms Limited | Administrative & support | 1961 |
| Barry Keymer Motor Repairs Limited | Wholesale & retail | 2011 |
| Barry Middleton Hockey Limited | Arts & recreation | 2010 |
| Barry's Bodyworks Ltd | Wholesale & retail | 2011 |
| Barsham Vale (Beccles) Management Company Limited | Households | 2021 |
| Bartchipperdoctor Ltd | Construction | 2021 |
| Barton Electrical (Ipswich) Limited | Construction | 2007 |
| Barton Freight Services Company Limited | Transport & logistics | 1976 |
| Barton Property (F & S) Ltd | Real estate | 2012 |
| Bartram Building Services Limited | Construction | 2024 |
| Bartram Property Limited | Construction | 2024 |
| Bartrum Nock Ltd | Information & communication | 2025 |
| Base Displays Limited | Wholesale & retail | 2002 |
| Base Garage (East Anglia) Ltd | Wholesale & retail | 2021 |
| Base Garage Limited | Real estate | 2001 |
| Base Online Limited | Information & communication | 2006 |
| Baseline Surveys & Mapping Limited | Professional & scientific | 2024 |
| Basetek (Holdings) Limited | Financial services | 2008 |
| Basetek (Marine) Limited | Extraterritorial | 2008 |
| Basetek Limited | Wholesale & retail | 2000 |
| Bash Traders Limited | Wholesale & retail | 2025 |
| Basilica Projects Limited | Information & communication | 2023 |
| Basilwood Limited | Wholesale & retail | 2015 |
| Baskett Electrical Ltd | Construction | 2019 |
| Baskwood Limited | Real estate | 1996 |
| Bastion Intelligence Tradecraft Ltd | Administrative & support | 2025 |
| BAT Property Services Ltd | Administrative & support | 2025 |
| Bates Properties (EA) Ltd | Real estate | 2023 |
| Bates Wells Ltd | Professional & scientific | 2013 |
| Bath & Stratford Homes Limited | Real estate | 2015 |
| Bath and Stratford Homes (TC) Limited | Real estate | 2016 |
| Bato Logistics Ltd | Transport & logistics | 2018 |
| Battle Honours Ltd | Administrative & support | 2005 |
| BATTLE4GED Ltd | Health & social care | 2023 |
| Bauder Limited | Wholesale & retail | 1979 |
| Baum UND Pferdgarten Limited | Manufacturing | 2021 |
| Baxter Engineering Limited | Wholesale & retail | 1996 |
| Bay & Lily Floristry Ltd | Wholesale & retail | 2022 |
| Bay of Bengal Takeaway Ltd | Hospitality | 2013 |
| Bay Rentals Ltd | Real estate | 2026 |
| Bayhasme Limited | Hospitality | 2017 |
| Bayhosh Medics Limited | Health & social care | 2023 |
| Baylham Investments Limited | Real estate | 2026 |
| Baylham Joinery Limited | Construction | 2023 |
| Baylham Landscapes Limited | Construction | 2018 |
| Baylis Business Consultancy Ltd | Information & communication | 2014 |
| Bayou Properties Ltd | Real estate | 2024 |
| Bayshore Property Ltd | Real estate | 2025 |
| Baytree Pizza Limited | Wholesale & retail | 2014 |
| BB Construction Limited | Construction | 1993 |
| BB Properties 86 Ltd | Real estate | 2026 |
| BB Timber Frame Ltd | Construction | 2023 |
| BB Tree & Garden Care Ltd | Administrative & support | 2024 |
| BBM Transport Limited | Transport & logistics | 2016 |
| BBQ Grill House East Ltd | Hospitality | 2019 |
| BCC Cargo Ltd | Transport & logistics | 2021 |
| Bcmglobal (UK) Limited | Administrative & support | 1997 |
| Bcmglobal London Limited | Financial services | 2004 |
| Bcmglobal Mortgage Services Limited | Financial services | 1967 |
| Bcpg Ltd | Other services | 2014 |
| BD Property Rentals Limited | Real estate | 2025 |
| BD365 Clean and Clever Solutions Limited | Administrative & support | 2025 |
| BD365 Clean Ltd | Administrative & support | 2018 |
| BD365 Ltd | Real estate | 2018 |
| BDC (Suffolk Holdings) Limited | Financial services | 2017 |
| BDD (Essex) Limited | Construction | 2023 |
| BDF Designs Limited | Professional & scientific | 2011 |
| BDF Interiors Limited | Manufacturing | 2018 |
| Bdonebyb Ltd | Other services | 2023 |
| BDS Transport Services Ltd | Transport & logistics | 2022 |
| BDX Logistics Ltd | Transport & logistics | 2019 |
| BE a Trustee Ltd | Administrative & support | 2024 |
| BE Bronzed Limited | Other services | 2022 |
| BE ME Like WE Ltd | Other services | 2019 |