| Assured Logistics Ltd | Transport & logistics | 2016 |
| Astravia Ltd | Information & communication | 2024 |
| Atcp Investments Ltd | Financial services | 2024 |
| Ative Project Ltd | Manufacturing | 2026 |
| Atkinson Barnes Limited | Professional & scientific | 2013 |
| Atlantic Management Services Ltd | Professional & scientific | 2022 |
| Atom Scientific Recruitment Ltd | Administrative & support | 2025 |
| ATS Aero Limited | Transport & logistics | 1973 |
| Augmented Systems Ltd | Professional & scientific | 2023 |
| Aura Holistics Ltd | Health & social care | 2025 |
| Autosustain Ltd | Professional & scientific | 2016 |
| Avanti Environmental Group Limited | Administrative & support | 1997 |
| Avanti Environmental Holdings Limited | Administrative & support | 2008 |
| Avasons Ltd | Administrative & support | 2023 |
| Avokado Technologies Limited | Information & communication | 2021 |
| B M Veale Transport Limited | Transport & logistics | 2011 |
| B&H Prestige Limited | Arts & recreation | 2016 |
| Babbuddoiu Ltd | Hospitality | 2024 |
| Baby Bird (UK) Limited | Real estate | 1999 |
| BAD Films Eitt Limited | Information & communication | 2024 |
| Baht. Design Studio Ltd | Professional & scientific | 2020 |
| Bailey Aviation Ltd | Professional & scientific | 2023 |
| Balance Brazilian Jiu-Jitsu Ltd | Arts & recreation | 2025 |
| Balance Consulting (Healthcare) Limited | Professional & scientific | 2010 |
| Balfour Properties (Marlow) Limited | Real estate | 1996 |
| Ballpark Media Ltd | Information & communication | 2014 |
| Bambam Services Limited | Information & communication | 2026 |
| Bank Apartments RTM Company Limited | Households | 2004 |
| BAP Pharma Group Limited | Administrative & support | 2015 |
| BAP Pharma Holdings Limited | Financial services | 2022 |
| BAP Pharma Limited | Health & social care | 2010 |
| Baratti Associates Limited | Professional & scientific | 2016 |
| Barbara Picheta Consulting Limited | Professional & scientific | 2012 |
| Barbicus Court Management Company Limited | Households | 2004 |
| Barbon Beck Ltd | Professional & scientific | 2026 |
| Barefoot Diva Ltd | Other services | 2014 |
| Barn Bledlow Limited | Professional & scientific | 2017 |
| Barons Court Management Company Limited | Households | 2012 |
| Barons Court Residents Management Company Limited | Households | 1997 |
| Barq Technologies Limited | Professional & scientific | 2021 |
| Barrett Legal Limited | Professional & scientific | 2025 |
| Barrett Move Limited | Real estate | 2020 |
| Base Pilates Ltd | Arts & recreation | 2020 |
| Basement Civil Developments Ltd | Construction | 2025 |
| Bastion Enterprise Ltd | Professional & scientific | 2009 |
| Batoul Trading Ltd | Wholesale & retail | 2021 |
| Bbme Media Group Limited | Arts & recreation | 1995 |
| BBY Waterside Limited | Real estate | 2017 |
| BCG Developments Ltd | Real estate | 2024 |
| BCG Performance Ltd | Extraterritorial | 2025 |
| BDC Lighting Ltd | Construction | 2025 |
| Beacon Hill Advisory Limited | Professional & scientific | 2024 |
| Beacon Hill Holdings Limited | Financial services | 2018 |
| Beacon Hill Tax Consulting LLP | | 2019 |
| Beaumont Court (Abercromby Avenue) Management Company Limited | Real estate | 2007 |
| Because Stories Ltd | Professional & scientific | 2026 |
| Beech House Management Company Limited | Households | 1982 |
| Beechcroft Marlow Limited | Professional & scientific | 2022 |
| Beechengrove Limited | Households | 2011 |
| Beechtree Consulting Ltd | Professional & scientific | 2023 |
| Beep Beep Limited | Professional & scientific | 2003 |
| Begins With W Limited | Financial services | 2022 |
| Behind the Beat Limited | Information & communication | 2020 |
| Bell Properties Limited | Real estate | 2017 |
| Belle Store Ltd | Wholesale & retail | 2019 |
| Bellworthy Close (Maidenhead) Management Company Limited | Households | 2018 |
| Belwich Ltd | Real estate | 2023 |
| Bemrose Holdings Ltd | Administrative & support | 2018 |
| BEN Cole Consulting Limited | Information & communication | 2018 |
| Benchmark Psychological Services Limited | Professional & scientific | 2006 |
| Benchmark Strategy Ltd | Households | 2022 |
| Benjamin R Chivers Ltd | Construction | 2019 |
| Bentleys Cleaning Services Ltd | Wholesale & retail | 2019 |
| Berkshire Care Association | Other services | 2006 |
| Berrylands House Limited | Real estate | 2012 |
| Berwick Residents (Marlow) Limited | Households | 1986 |
| Bespoke Light Limited | Construction | 2018 |
| Best Resolution Ltd | Manufacturing | 2016 |
| Beyond Bespoke Ltd | Manufacturing | 2019 |
| BEYOND11 Ltd | Professional & scientific | 2025 |
| BG Rating Consultancy Ltd | Professional & scientific | 2018 |
| BGK Global Ltd | Professional & scientific | 2023 |
| BGK Natures Energy Ltd | Health & social care | 2026 |
| BHB (Sidmouth) Ltd | Real estate | 2016 |
| Bhere.Tv Limited | Information & communication | 2014 |
| Bialto Limited | Real estate | 2016 |
| Bibin Limited | Health & social care | 2019 |
| Bickley Group Limited | Administrative & support | 2020 |
| Big Betty Food Company Group Limited | Financial services | 2022 |
| Big Betty Food Company Limited | Hospitality | 2022 |
| Big Tiff Limited | Professional & scientific | 2007 |
| Biohack London Ltd | Wholesale & retail | 2025 |
| Bioinsights Consulting LLP | | 2023 |
| Biophonica Ltd | Administrative & support | 2022 |
| Birchville Management Company Limited | Households | 1987 |
| Biro ITN Limited | Financial services | 2019 |
| Bisham Abbey Sailing and Navigation School Ltd | Arts & recreation | 1998 |
| Bisham Court Limited | Households | 2005 |
| Bisham Estate Limited | Households | 2025 |
| Bisham Sales & Marketing Ltd | Professional & scientific | 2026 |