| Bold Resources Ltd | London | 2025 |
| Boldon Drilling Limited | Nottingham | 1972 |
| Boliden Commercial UK Ltd | Coventry | 2006 |
| Bolton Easy LET Ltd | London | 2019 |
| Bolton Precision Engineering Limited | Carnoustie | 2008 |
| Bolu Trading Company Ltd | Cambridge | 2018 |
| Boma Pipe Limited | Aberdeen | 1991 |
| Bomar Offshore Ltd | Aberdeen | 2008 |
| Bona Borado Ltd | Banchory | 2015 |
| Bonluck Ltd | Mildenhall | 2024 |
| Bonnar Sand & Gravel Co. Limited | Glasgow | 1975 |
| Bono Energy Limited | London | 2019 |
| Bonohgroup Ltd | London | 2025 |
| Boomrealm International Limited | Downham Market | 2007 |
| Bora Energi Limited | London | 2026 |
| Borch WIX Energy Advisors Limited | Chichester | 2020 |
| Border Stone Quarries Limited | Carlisle | 2010 |
| Borders & Southern Falkland Islands Limited | London | 2005 |
| Borders & Southern Petroleum PLC | London | 2004 |
| Borough Green Sand Pits Limited | Canterbury | 1956 |
| Borr Drilling Land Support Limited | Aberdeen | 2013 |
| Borr Drilling Management (UK) Limited | London | 2017 |
| Borycki Investments (PVT) Limited | London | 2017 |
| Boskalis Subsea Services Limited | Fareham | 2003 |
| Boston Building and Construction Limited | Boston | 2018 |
| Bosveld Services Limited | Swadlincote | 2013 |
| Boudicca Exploration and Production Limited | Newquay | 2014 |
| Boudicca Resources Limited | Newquay | 2014 |
| Boundary Stone Park Developments Ltd | Preston | 2019 |
| Bournewood Sand & Gravel Limited | Swanley | 1999 |
| Bowery Resources Limited | Oxford | 2021 |
| Bowland Resources (NO.2) Limited | Windsor | 2008 |
| Bowland Resources Limited | Windsor | 2009 |
| Bowleven Limited | Edinburgh | 2001 |
| Boxlock Engineering Limited | Bath | 2011 |
| Boyle Aggregate Equipment Engineering Limited | Dungannon | 2011 |
| Boylestone Estates Ltd | Glasgow | 2022 |
| BP (ABU Dhabi) Limited | Middlesex | 1962 |
| BP (GTA Mauritania) Finance Limited | Middlesex | 2019 |
| BP (GTA Senegal) Finance Limited | Middlesex | 2019 |
| BP Adua Limited | Sunbury On Thames | 2024 |
| BP Adua Operating Company Limited | Sunbury On Thames | 2024 |
| BP Agung I Limited | Sunbury On Thames | 2022 |
| BP Agung II Limited | Sunbury On Thames | 2022 |
| BP Amoco Exploration (Faroes) Limited | Liverpool | 1965 |
| BP Barong Limited | Sunbury On Thames | 2026 |
| BP Bintuni Limited | Sunbury On Thames | 2026 |
| BP Drawa Limited | Sunbury On Thames | 2026 |
| BP East Kalimantan CBM Limited | Middlesex | 2007 |
| BP Energy Company of Kirkuk Limited | Sunbury On Thames | 2024 |
| BP Engineering Ltd | London | 2023 |
| BP Exploration (Alpha) Limited | Middlesex | 1971 |
| BP Exploration (Azerbaijan) Limited | Middlesex | 1987 |
| BP Exploration (Caribbean) Limited | Sunbury On Thames | 2024 |
| BP Exploration (Caspian Sea) Limited | Middlesex | 1946 |
| BP Exploration (D230) Limited | Middlesex | 2019 |
| BP Exploration (Delta) Limited | Middlesex | 1970 |
| BP Exploration (Epsilon) Limited | Middlesex | 1971 |
| BP Exploration (Shafag-Asiman) Limited | Sunbury On Thames | 2011 |
| BP Exploration (Shah Deniz) Limited | Middlesex | 1996 |
| BP Exploration (South Atlantic) Limited | Sunbury On Thames | 2012 |
| BP Exploration (STP) Limited | Middlesex | 2018 |
| BP Exploration (Uzbekistan) Limited | Middlesex | 2026 |
| BP Exploration Argentina Limited | Middlesex | 2019 |
| BP Exploration Beta Limited | Middlesex | 1967 |
| BP Exploration Company (Middle East) Limited | Middlesex | 1914 |
| BP Exploration Company Limited | Aberdeen | 1877 |
| BP Exploration Indonesia Limited | Middlesex | 1971 |
| BP Exploration Libya Limited | Middlesex | 2005 |
| BP Exploration Mediterranean Limited | Sunbury On Thames | 2023 |
| BP Exploration North Africa Limited | Middlesex | 2005 |
| BP Exploration Operating Company Limited | Middlesex | 1935 |
| BP Exploration Orinoco Limited | Middlesex | 1958 |
| BP Exploration Services India Limited | Sunbury On Thames | 2025 |
| BP Gaea II Limited | Sunbury On Thames | 2025 |
| BP Gaea Limited | Sunbury On Thames | 2025 |
| BP GAS Marketing Limited | Middlesex | 1967 |
| BP INV3 Bidco Ltd | London | 2017 |
| BP INV3 Holdco Ltd | London | 2017 |
| BP INV3 Midco Ltd | London | 2017 |
| BP INV3 Topco Ltd | London | 2017 |
| BP Karabagh Operating Company Limited | Sunbury On Thames | 2017 |
| BP Kuwait Limited | Middlesex | 1934 |
| BP Namibia Energy Limited | Sunbury On Thames | 2026 |
| BP Offshore & Logistics Ltd | Glasgow | 2025 |
| BP Pipelines (Tanap) Limited | Sunbury On Thames | 2013 |
| BP Senegal Investments Limited | Sunbury On Thames | 2016 |
| BP Shafag-Asiman Limited | Sunbury On Thames | 2011 |
| BPC Uruguay Holdings Limited | London | 2020 |
| BPE Ltd | London | 2017 |
| BPK Engineering Ltd | Kirkcaldy | 2025 |
| BPL Mining Limited | Birmingham | 2018 |
| BQI FUM Innovation Ltd | Sittingbourne | 2018 |
| Bradonwell Limited | Suffolk | 2006 |
| Bradwell West Ltd | Crewe | 2023 |
| Braemore Platinum Limited | London | 2006 |
| Braemore Resources Limited | London | 2005 |
| Brainbank Energy Limited | Milton Keynes | 2014 |
| Brankling Petroscience Limited | Weymouth | 2012 |
| Branston Consulting Ltd | Lincoln | 2021 |