| Avon Fastenings Limited | Wholesale & retail | 2005 |
| Avon Healthcare Limited | Wholesale & retail | 2009 |
| Avon Heat Pumps Ltd | Construction | 2021 |
| Avon Phone Shop Ltd | Wholesale & retail | 2023 |
| Avon Plating Limited | Manufacturing | 2002 |
| Avon Property Limited | Real estate | 2013 |
| Avon Repair Services Ltd | Wholesale & retail | 2025 |
| Avon Search & Selection Ltd | Administrative & support | 2018 |
| Avon Services Heating and Plumbing Ltd | Construction | 2018 |
| Avon Support Limited | Health & social care | 2011 |
| Avon Technology Consultants Ltd | Administrative & support | 2023 |
| Avon Trailers Limited | Wholesale & retail | 2025 |
| Avon Windows and Doors Ltd | Construction | 2023 |
| Avonclean (Stratford) Ltd | Administrative & support | 2007 |
| Avoncot Limited | Hospitality | 2011 |
| Avoncroft Residential Limited | Professional & scientific | 2023 |
| Avongard Holdings Limited | Financial services | 2016 |
| Avongard Limited | Professional & scientific | 1979 |
| Avonmore Associates Limited | Construction | 2014 |
| Avonside Caravan Site Limited | Hospitality | 1962 |
| Avonside Carpentry & Glazing Ltd | Financial services | 2021 |
| Avonspa Electrics Limited | | 1979 |
| Avtr Management & Publishing Ltd | Arts & recreation | 2012 |
| Awards Management Services Limited | Professional & scientific | 2017 |
| Aypex Limited | Administrative & support | 2016 |
| AZ2025 Ltd | Wholesale & retail | 2025 |
| Aztec Builders (Stratford) Limited | Construction | 2016 |
| B & B London Limited | Hospitality | 2009 |
| B & B London Properties Limited | Administrative & support | 2008 |
| B Biran Consulting Ltd | Information & communication | 2024 |
| B M Prickett Joinery Ltd | Manufacturing | 2003 |
| B&N Car Sales Ltd | Wholesale & retail | 2022 |
| B13 Holdings Limited | Administrative & support | 2017 |
| B13 Technology Vietnam Ltd | Information & communication | 2019 |
| B6 Project Management Limited | Construction | 2019 |
| Baas Technologies Limited | Professional & scientific | 1993 |
| Baby Piggy Ltd | Other services | 2025 |
| Baby Transport Ltd | Transport & logistics | 2025 |
| Back Focus Limited | Extraterritorial | 2025 |
| BAD Apple Hair Stratford Limited | Other services | 2018 |
| Badis Jewellery Limited | Wholesale & retail | 2020 |
| BAG8 Ltd | Wholesale & retail | 2024 |
| Baggett Project Services Limited | Professional & scientific | 2016 |
| Bailey Plumbing and Heating Limited | Construction | 2003 |
| Bainbridge & Co. Limited | Professional & scientific | 2016 |
| Bakemail Limited | Extraterritorial | 2015 |
| Balance App Limited | Health & social care | 2019 |
| Balance Leisure Services Limited | Wholesale & retail | 1997 |
| Balmoral Care Ltd | Health & social care | 2014 |
| Balti Kitchen Ltd | Hospitality | 2025 |
| BAM Investments Limited | Real estate | 2024 |
| Bancroft Cruisers Limited | Administrative & support | 2011 |
| Bang Trade Ltd | Wholesale & retail | 2013 |
| Bangingbargins Ltd | Wholesale & retail | 2025 |
| Banner Department Limited | Professional & scientific | 2022 |
| Banyan Home Care Services Limited | Health & social care | 2009 |
| Bar-None Healthcare LLP | | 2009 |
| Baraset Properties Limited | Real estate | 2016 |
| Barberia Ltd | Other services | 2023 |
| Barbers Flooring Limited | Wholesale & retail | 2009 |
| Barbers Properties Ltd | Real estate | 2025 |
| Barcley Williams Limited | Wholesale & retail | 2008 |
| Bardia's Limited | Hospitality | 2017 |
| Barford Auto Sales Ltd | Wholesale & retail | 2024 |
| Barhill Enterprises Ltd | Hospitality | 2020 |
| Barlestone Management Company Limited | Households | 2015 |
| Barleycrest Properties Limited | Construction | 2016 |
| Barncroft Management Investment Ltd | Professional & scientific | 2017 |
| Barretts Drainage Ltd | Construction | 2016 |
| Barry the Butcher (Wholesale) Limited | Wholesale & retail | 2019 |
| Barry the Butcher Limited | Wholesale & retail | 2005 |
| Bartolotti Limited | Other services | 2025 |
| Barton Orchards Limited | Real estate | 2016 |
| Baskerville Wharf (Birmingham) Limited | Other services | 2017 |
| Baskerville Wharf LLP | | 2011 |
| Bassbros Limited | Wholesale & retail | 2020 |
| Bastian IP Limited | Professional & scientific | 2025 |
| Batchheader Limited | Information & communication | 2010 |
| Battlebridge Group Limited | Professional & scientific | 1993 |
| Bazaar Events Limited | Administrative & support | 2017 |
| BCE Groundworks & Services Ltd | Construction | 2024 |
| BCL Brice Limited | Financial services | 2025 |
| BD Trinder Limited | Construction | 2025 |
| BDR Group Limited | Information & communication | 2022 |
| BDR Technical Solutions Ltd | Information & communication | 1995 |
| BDR Voice & Data Solutions Ltd | Information & communication | 1991 |
| BE Loyal Limited | Extraterritorial | 2007 |
| BE Wealth LLP | | 2024 |
| Beacon Insights Ltd | Information & communication | 2025 |
| Bear PIT Theatre Ltd | Arts & recreation | 2011 |
| Beaufield Holdings Limited | Financial services | 2021 |
| Beaufield Investments Limited | Real estate | 1995 |
| Beaufort Harbour Limited | Real estate | 2012 |
| Beaufort Residential Limited | Real estate | 2020 |
| Beauty Brands Connect Limited | Other services | 2017 |
| Beauty Media Limited | Information & communication | 2009 |
| Beech Court Residents CV37 7UQ Limited | Households | 2008 |
| Beech Properties (Oxhill) Ltd | Professional & scientific | 2004 |
| Bell Systems Limited | Information & communication | 2002 |
| BEN Field Specialised Construction Ltd | Construction | 2021 |