| Auto Refurb Bushey Limited | Wholesale & retail | 2026 |
| Avalon TE Abre SUS Puertas Ltd | Administrative & support | 2026 |
| Avalongas Limited | Manufacturing | 2015 |
| Avan Engineering Services Ltd | Professional & scientific | 2012 |
| Avara Capital Limited | Financial services | 2026 |
| AVC Property Ltd | Real estate | 2024 |
| Aventus Wilson Limited | Administrative & support | 2013 |
| Avila Haus Aesthetics Ltd | Other services | 2025 |
| Avneet Ltd | Information & communication | 2022 |
| Avocado Direct Limited | Administrative & support | 2020 |
| Avy's Hair & Beauty Ltd | Other services | 2023 |
| Azachi Ltd | Construction | 2025 |
| Azeemoazee Holdings Ltd | Manufacturing | 2023 |
| Azmis Ltd | Real estate | 2023 |
| Azvdo Consultancy Limited | Professional & scientific | 2023 |
| B P Holdings ( Bushey ) Limited | Professional & scientific | 2023 |
| B&T Investments Limited | Real estate | 2019 |
| Bans Management Limited | Real estate | 2014 |
| Banyan Tree Capital Ltd | Financial services | 2025 |
| Barnett Investments Limited | Real estate | 2014 |
| Barracuda Catering Limited | Hospitality | 2011 |
| Basegate Limited | Real estate | 2000 |
| BAT Construction & OIL Products Trade Corporation Ltd | Mining & quarrying | 2023 |
| Battlecraft Limited | Real estate | 1994 |
| BCL Marketing Limited | Professional & scientific | 2022 |
| Bcmc Limited | Households | 2000 |
| BDA Mechanical Services Limited | Professional & scientific | 2007 |
| Beaumont Estates Limited | Real estate | 2016 |
| Beauty EMA Ltd | Other services | 2017 |
| Beehive Roofing Ltd | Construction | 2026 |
| Bees Joint Ltd | Manufacturing | 2024 |
| Behaviour Consultancy Limited | Education | 2012 |
| Being to Being Limited | Health & social care | 2017 |
| Beirne Transport Limited | Transport & logistics | 2018 |
| Beirut Oriental Foods Ltd | Wholesale & retail | 2025 |
| Bella Rosa Ltd | Hospitality | 2017 |
| Belmont Store Ltd | Wholesale & retail | 2017 |
| Bentley's Barbers Ltd | Other services | 2021 |
| Bentley’Z Barber Ltd | Other services | 2020 |
| Berkmead Limited | Professional & scientific | 2018 |
| Berkoff Limited | Professional & scientific | 1999 |
| Berley Accountants Limited | Professional & scientific | 2010 |
| Bernfam Investments Limited | Administrative & support | 2023 |
| Bespoke House Refurbishment Ltd | Construction | 2018 |
| Best Swim School Ltd | Education | 2022 |
| Better Care 4 U Ltd | Health & social care | 2024 |
| Better Things Marketing Ltd | Information & communication | 2010 |
| Better Things Property Limited | Real estate | 2017 |
| Better Together Consulting Ltd | Other services | 2022 |
| Bexley-M-R Limited | Water & waste | 2026 |
| Beyond Body Ltd | Wholesale & retail | 2025 |
| Beyond Cleaning Group Ltd | Administrative & support | 2022 |
| BH Care Holdings Limited | Financial services | 2026 |
| BH Care Limited | Health & social care | 2015 |
| Bhavi Limited | Wholesale & retail | 2018 |
| Bicester Properties (Bushey) Limited | Real estate | 2007 |
| Bicester Properties Limited | Real estate | 2006 |
| Bigabs Ltd | Wholesale & retail | 2021 |
| Birch Real Estate Ltd | Real estate | 2026 |
| BIS (International) Limited | Wholesale & retail | 1995 |
| Bkr-D Property and Management Company Ltd | Real estate | 2025 |
| Black and White Cars Limited | Transport & logistics | 2020 |
| Black Classic Ltd | Manufacturing | 2006 |
| Black Pearl Properties Limited | Real estate | 2017 |
| Blackrose Management Limited | Administrative & support | 2018 |
| Blake Mortgage and Protection Services Ltd | Financial services | 2018 |
| Blenheim Realty (North London) Ltd | Financial services | 2018 |
| Block D Clouston Avenue RTM Company Limited | Households | 2023 |
| Block F Clouston Avenue RTM Company Limited | Households | 2024 |
| Blue Flame Central Heating Limited | Construction | 2012 |
| Blue Kitchen Limited | Hospitality | 2023 |
| Bluepeek Solution Limited | Information & communication | 2025 |
| Blukat Ltd | Health & social care | 2026 |
| BMC Shared Services Ltd | Real estate | 2025 |
| Bodbud Healthcare Ltd | Public administration | 2024 |
| Boghi Brickwork Ltd | Construction | 2025 |
| Bonsai Property Investment Limited | Real estate | 2011 |
| Boon Beauty Ltd | Other services | 2025 |
| Boost Humidity Control (UK) Ltd | Wholesale & retail | 2022 |
| Bournehall House 2022 RTM Company Limited | Households | 2022 |
| Bournehall House Ltd | Administrative & support | 2012 |
| Boutique Property Services Limited | Real estate | 2022 |
| BPM Process Consulting Ltd | Information & communication | 2019 |
| Brain and Spine Clinic Ltd | Health & social care | 2010 |
| Brand Boost Studio Ltd | Professional & scientific | 2024 |
| Brandi Design Ltd | Information & communication | 2015 |
| Brandon Scott Residential Ltd | Real estate | 2025 |
| Bravebyte Limited | Other services | 1989 |
| Bravery Post Limited | Information & communication | 2021 |
| BRC Wholesale Limited | Wholesale & retail | 2018 |
| Breast Cancer Naked Truth Ltd | Information & communication | 2023 |
| Brenda International PTE Ltd | Manufacturing | 2025 |
| Brenoaia Ltd | Construction | 2019 |
| Breslauer Limited | Real estate | 2006 |
| Bricks Residential Ltd | Real estate | 2023 |
| Bricrown Solutions Limited | Professional & scientific | 1998 |
| Bridge York ROW Limited | Real estate | 2014 |
| Bright Consulting Limited | Professional & scientific | 2001 |
| Bright Kidz PRE School (Pinner) Limited | Education | 2026 |
| Bright Kidz PRE School Limited | Education | 2007 |