| 37/39 Eastfield Road (Management Co) Limited | Administrative & support | 1996 |
| 3FORGE UK Ltd | Information & communication | 2024 |
| 99 Alternatives Ltd | Information & communication | 2017 |
| A&J Pharma Ltd | Manufacturing | 2023 |
| Absolute Windows Ltd | Construction | 2017 |
| Adox Ltd | Professional & scientific | 2026 |
| Adto Specialist Cleaning Services Ltd | Administrative & support | 2025 |
| Advanced Technologies Investments Limited | Professional & scientific | 1984 |
| Affordable Vehicles Ltd | Financial services | 2018 |
| Affordable Windows & Construction Ltd | Construction | 2014 |
| AGE Concern Slough and Berkshire East | Health & social care | 1999 |
| AL Rayyan Hospitality Limited | Real estate | 2012 |
| Alexandras Community Care Ltd | Health & social care | 2017 |
| Alexandras Podiatry Care Ltd | Health & social care | 2025 |
| Aliri Investments Limited | Real estate | 2017 |
| Alpha Tradex Ltd | Wholesale & retail | 2025 |
| Always Photography Limited | Professional & scientific | 2003 |
| Amity Cargo Services Limited | Professional & scientific | 1989 |
| Analysis 21 Limited | Other services | 2024 |
| Andy Williams SFX Ltd | Information & communication | 2021 |
| Annapoorna IT Solutions Ltd | Information & communication | 2017 |
| Ansett Aircraft Spares & Services Limited | Wholesale & retail | 1987 |
| AOE Engineering Limited | Professional & scientific | 2008 |
| AR Aviacom Limited | Wholesale & retail | 2014 |
| Ashburton Projects Limited | Construction | 2011 |
| Ashleigh Property Holdings Limited | Professional & scientific | 2001 |
| Athena HR Consultancy Ltd | Administrative & support | 2020 |
| Athena Roofing Limited | Construction | 2021 |
| AWK Fittings Limited | Wholesale & retail | 2021 |
| Azura Advisors UK Limited | Administrative & support | 2016 |
| Azura Security Company Limited | Professional & scientific | 2015 |
| Bacia Limited | Information & communication | 2016 |
| Barrow & Gale Limited | Manufacturing | 1995 |
| Barrow Hepburn & Gale Ltd | Manufacturing | 2015 |
| Barrow Hepburn Gale Limited | Manufacturing | 2021 |
| Barrow Hepburn Limited | Manufacturing | 2023 |
| Bask (PVT) Ltd | Real estate | 2020 |
| Beech Court (Burnham) Limited | Extraterritorial | 2003 |
| Beeches Learning and Development Trust | Education | 2011 |
| Bespoke Care at Home Ltd | Other services | 2011 |
| Big Ben's Fish & Chips Ltd | Hospitality | 2016 |
| Blanc Rooms Ltd | Real estate | 2025 |
| Boron Consortium Services Limited | Professional & scientific | 2010 |
| BPL Business Media Limited | Information & communication | 1990 |
| Brandmovers Europe Limited | Information & communication | 2008 |
| Brew & Brunch by Luxfood Ltd | Hospitality | 2025 |
| Brook END Farm Management Company Limited | Extraterritorial | 2002 |
| Brooklyns Financial Ltd | Financial services | 2010 |
| Brooklyns Residential Ltd | Real estate | 2015 |
| Burnham Law Practice Limited | Professional & scientific | 2013 |
| Burnham Physiotherapy and Sports Injury Clinic Limited | Health & social care | 2008 |
| Business in Education Associates LLP | | 2009 |
| Care Concern Group Limited | Health & social care | 2017 |
| Care Concern Management EA 2 Limited | Health & social care | 2017 |
| Care Concern Management NH Limited | Health & social care | 2019 |
| Catchum 88 Limited | Extraterritorial | 1988 |
| Chamonix Private Equity LLP | | 2008 |
| Chauvin Arnoux U.K. Limited | Wholesale & retail | 1986 |
| Choralis Consulting Limited | Administrative & support | 2003 |
| Chris Greve Ltd | Construction | 2022 |
| Churchill's Finest Hour Limited | Arts & recreation | 2021 |
| Clemi Capital Finance Ltd | Financial services | 2010 |
| Cliveden Business Services Ltd | Professional & scientific | 2016 |
| Collaborative Health Care Ltd | Administrative & support | 2014 |
| Contact Intelligence Limited | Professional & scientific | 2013 |
| Cornacre Management Ltd | Financial services | 2015 |
| Cromwell & Mason Ltd | Wholesale & retail | 2021 |
| Cyber Risk Ltd | Information & communication | 2017 |
| D Property Investment Ltd | Real estate | 2023 |
| Dalefine Limited | Hospitality | 1988 |
| Daleo Limited | Professional & scientific | 2007 |
| Deco Magna Limited | Other services | 2017 |
| Deeside Care LLP | | 2013 |
| Distillery Direct Limited | Professional & scientific | 2008 |
| DR R V Fitness Limited | Other services | 2023 |
| DR Sophia Puri Limited | Health & social care | 2025 |
| Dropmore Road (Burnham) Management Company Limited | Households | 2010 |
| Dynamic Resourcing Group Limited | Professional & scientific | 2007 |
| Dynamic Resourcing Services Limited | Administrative & support | 2006 |
| Eacotts Financial Services Limited | Financial services | 2013 |
| Eacotts Holdings Limited | Financial services | 2018 |
| Eacotts International Limited | Professional & scientific | 1995 |
| Eacotts Limited | Professional & scientific | 2018 |
| Eagle Service & Machinery Limited | Administrative & support | 1999 |
| Elaraedgex Ltd | Information & communication | 2025 |
| Electracom Projects (UK) Ltd | Construction | 2008 |
| Electracom Services (UK) Ltd | Construction | 2024 |
| Elgin Holdings Limited | Real estate | 2008 |
| Elite Landscapes Holdco Limited | Financial services | 2026 |
| Elite Landscapes Limited | Construction | 1999 |
| Elra Energy Limited | Health & social care | 2025 |
| EM PHO Ltd | Hospitality | 2023 |
| Emerald Formula Limited | Information & communication | 2016 |
| Eminent Consultancy Ltd | Other services | 2016 |
| Estrid Studios UK Ltd | Wholesale & retail | 2023 |
| Eternis UK Limited | Wholesale & retail | 2014 |
| Exeter Care Developments Limited | Health & social care | 2017 |
| Falcon Cleaners UK Ltd | Administrative & support | 2023 |
| Feuk Limited | Professional & scientific | 2015 |
| Fittrackpro Ltd | Information & communication | 2026 |