| Atoe Trading Ltd | Professional & scientific | 2025 |
| Atria Investments Ltd | Real estate | 2025 |
| Atwell Wilson Motor Museum | Administrative & support | 2010 |
| Atwell Wilson Motor Museum Enterprises Limited | Administrative & support | 2011 |
| Austin Stallan Limited | Real estate | 2021 |
| Avant Garde Research Group Ltd | Professional & scientific | 2022 |
| Avebury DRY Stone Walling Ltd | Construction | 2024 |
| Avebury Mews Management Company (Number 3) Limited | Households | 2005 |
| Avebury Mews Management Company (Number 5) Limited | Households | 2005 |
| Avevo Properties & Investments Ltd | Real estate | 2019 |
| Avocado Property Investments Ltd | Real estate | 2017 |
| Awdry Close 1958 Limited | Extraterritorial | 2015 |
| AWS Plumbing Limited | Construction | 2007 |
| Axcent Limited | Other services | 2018 |
| Axleo Systems Limited | Wholesale & retail | 2026 |
| Azeez Ltd | Hospitality | 2022 |
| B Clarkes Products Ltd | Wholesale & retail | 2024 |
| B S Countryside Management Limited | Administrative & support | 2013 |
| B.Y. Joinery Limited | Professional & scientific | 2002 |
| Back Stage Engineering Ltd | Wholesale & retail | 1990 |
| Back Stage Technologies (Europe) Limited | Professional & scientific | 2000 |
| Back to Fresh Ltd | Wholesale & retail | 2025 |
| Baileo Stays Ltd | Administrative & support | 2020 |
| Baker 47 Developments Limited | Construction | 2022 |
| Baker Holdings Limited | Real estate | 2015 |
| Barefoot Fitness Property Ltd | Real estate | 2022 |
| Bassett Installations of Calne Ltd | Other services | 2011 |
| Bath Signs Ltd | Manufacturing | 2019 |
| Baz-Roll International Limited | Manufacturing | 2011 |
| Baz-Roll Products Limited | Manufacturing | 1973 |
| Bbrb Ltd | Real estate | 2009 |
| Beamway Property Ltd | Real estate | 2025 |
| Beehive Property Rentals Ltd | Real estate | 2019 |
| Bell Meadow (Calne) Management Limited | Households | 2017 |
| Bellamet (UK) Limited | Manufacturing | 1994 |
| BEN Brodie Clinical Coding Limited | Information & communication | 2025 |
| Benjamin Hayford Ltd | Health & social care | 2017 |
| Best Italian Food Ltd | Hospitality | 2025 |
| BEX Design & Print Ltd | Manufacturing | 1996 |
| Bigfly Property Ltd | Real estate | 2020 |
| BIL Group Holdings Limited | Financial services | 2022 |
| BIL Group IH Limited | Manufacturing | 2022 |
| Billy's Girl Ltd | Wholesale & retail | 2025 |
| Bitesize Tax Ltd | Extraterritorial | 2019 |
| Bixteth Partners Limited | Other services | 2018 |
| BKR Property Maintenance Ltd | Construction | 2026 |
| Black Berry Food Ltd | Wholesale & retail | 2023 |
| Black Dog Roofing Ltd | Construction | 2021 |
| Black Dog Taxis Ltd | Transport & logistics | 2018 |
| Black FOX Financial Limited | Financial services | 2016 |
| Black Nova Designs Limited | Information & communication | 2012 |
| Black Trading Limited | Professional & scientific | 2021 |
| Blackland Lakes Limited | Hospitality | 2015 |
| Blend Network Ltd | Other services | 2023 |
| BLF Communications Ltd | Professional & scientific | 2019 |
| BLF Group Ltd | Financial services | 2019 |
| BLF Property Ltd | Real estate | 2024 |
| Blocks Capital Ltd | Financial services | 2022 |
| Blocks Management Ltd | Households | 2022 |
| Blocks Ventures Ltd | Real estate | 2022 |
| Blue Planet Triathlon Limited | Arts & recreation | 2016 |
| Blue Sky Independent School Ltd | Education | 2025 |
| Blue Sky Learning Centre Ltd | Education | 2020 |
| Bluebird Snowsports Limited | Arts & recreation | 2016 |
| Bluegate Services Ltd | Information & communication | 2015 |
| BMC Projects Limited | Administrative & support | 2004 |
| BOA Onda Ltd | Wholesale & retail | 2023 |
| Boatman Admin Services Limited | Administrative & support | 2015 |
| Boatman Enterprises Limited | Professional & scientific | 2022 |
| Bobby & Holes Estates Ltd | Construction | 2021 |
| Bolan Properties Ltd | Financial services | 2021 |
| Bolt Electrical Contractors Limited | Construction | 2012 |
| Bolts Deli Ltd | Wholesale & retail | 2024 |
| Bond Solutions Limited | Administrative & support | 2024 |
| Boomhaus Studio Limited | Professional & scientific | 2025 |
| Borders Pet Foods Limited | Manufacturing | 2016 |
| Bosmino Ltd | Hospitality | 2021 |
| Box Property Group Ltd | Construction | 2010 |
| BP Milling Ltd | Manufacturing | 2021 |
| Brainwise Consulting Ltd | Professional & scientific | 2023 |
| Bramble Cottage Ltd | Hospitality | 2021 |
| Breathe Markets Ltd | Wholesale & retail | 2020 |
| Breathe Property Group Ltd | Financial services | 2019 |
| Bremhill Farm Partnership LP | | 2018 |
| Bremhill Investments Ltd | Financial services | 2018 |
| Brenco CCM Ltd | Professional & scientific | 2021 |
| Brenco Group Ltd | Financial services | 2017 |
| Brenco Property Ltd | Real estate | 2017 |
| Brenco Rivers Street Ltd | Hospitality | 2018 |
| Bright Minder Ltd | Professional & scientific | 2015 |
| Brookstone Collective Ltd | Financial services | 2026 |
| Brookstone Estates Ltd | Real estate | 2026 |
| Brookstone Interim Ltd | Real estate | 2024 |
| Brookstone Property Development Ltd | Real estate | 2026 |
| Brunel Office Supplies Limited | Administrative & support | 1997 |
| BTH Property Ltd | Real estate | 2020 |
| Buckley Renovation Ltd | Construction | 2020 |
| Building Certification Ltd | Construction | 2016 |
| Buist International Ltd | Wholesale & retail | 2017 |
| Bulldog Aeros Limited | Transport & logistics | 2013 |