| 1.61 Capital Ltd | Real estate | 2026 |
| 1.61 London Belgravia Ltd | Real estate | 2026 |
| 1.61 London Citadel Ltd | Real estate | 2026 |
| 1.61 London Developments Ltd | Construction | 2021 |
| 1.61 London Knightsbridge Ltd | Real estate | 2026 |
| 1.61 London Ltd | Construction | 2010 |
| 1.61 London SJW 1 Limited | Construction | 2024 |
| 1.61 London SJW Holdings Limited | Financial services | 2024 |
| 1.61 London SJW Limited | Construction | 2022 |
| 1.61 Westminster Limited | Real estate | 2026 |
| 10K Media Ltd | Information & communication | 2021 |
| 11 - 13 Tudor Mansions (Freehold) Company Limited | Households | 2018 |
| 121 Virtual Fitness Ltd | Arts & recreation | 2020 |
| 12TH Studio Ltd | Professional & scientific | 2022 |
| 180 Brighton Road Freehold Limited | Real estate | 2019 |
| 1ST Advanced Heating & Plumbing Limited | Construction | 2010 |
| 21 Carpentry Limited | Construction | 2023 |
| 242057 Limited | Hospitality | 2025 |
| 2CREATE Training Solutions LLP | | 2019 |
| 2MS Construction Holdings Ltd | Financial services | 2025 |
| 2MS Construction Ltd. | Construction | 2007 |
| 2QUEST Limited | Transport & logistics | 2019 |
| 32 Byne Road Ltd | Real estate | 2014 |
| 360 Property Services (Sussex) Limited | Construction | 2017 |
| 3C Media Ltd | Professional & scientific | 2014 |
| 3POINT Recruitment Group Ltd | Administrative & support | 2025 |
| 4 Cleantech Ltd | Energy | 2018 |
| 4CARTERS Ltd | Real estate | 2020 |
| 4K-AV Ltd | Information & communication | 2015 |
| 4PL Ltd | Transport & logistics | 2016 |
| 5 Star Plumbing & Heating (Sussex) Limited | Construction | 2019 |
| 505 Digital Ltd | Professional & scientific | 2020 |
| 55 Tivoli Crescent (Brighton) Freehold Limited | Households | 2011 |
| 59&1ST Ltd | Administrative & support | 2018 |
| 63 Perham Road Limited | Extraterritorial | 1994 |
| 7 Alexandra Villas (Brighton) Limited | Households | 2007 |
| 72 Electrical Ltd | Construction | 2009 |
| 9U Travel Ltd | Administrative & support | 2023 |
| A C G Builders Sussex Limited | Administrative & support | 2017 |
| A C G Groundworks Ltd | Administrative & support | 2018 |
| A N & Sons Properties Ltd | Real estate | 2025 |
| A Plus Rated Windows Limited | Construction | 2014 |
| A Y Developers Ltd | Construction | 2019 |
| A Y Hill Brow Ltd | Real estate | 2022 |
| A Y Old Shoreham Road Ltd | Real estate | 2022 |
| A Y Portfolios Ltd | Real estate | 2022 |
| A&Ab Limited | Wholesale & retail | 2025 |
| A&B Interiors Limited | Construction | 2015 |
| A-Z Online Training Limited | Education | 2024 |
| A.E. Adams (Holdings) Limited | Professional & scientific | 2007 |
| A.E.Adams(Henfield)Limited | Manufacturing | 1965 |
| A.M.B Auto Services Limited | Extraterritorial | 2015 |
| Aaron Barbour Consultancy Ltd | Professional & scientific | 2023 |
| Abacus Brighton Limited | Wholesale & retail | 2023 |
| Abbott Aviation Ltd | Professional & scientific | 2024 |
| Able House Limited | Health & social care | 2016 |
| Accent Consulting Limited | Professional & scientific | 2022 |
| Ace Assets Limited | Professional & scientific | 2004 |
| Ace Taxis (West Sussex) Ltd | Transport & logistics | 2014 |
| Ace Vehicle Leasing Limited | Administrative & support | 2026 |
| ACF Contracts Ltd | Construction | 2017 |
| Ackerman Music Limited | Wholesale & retail | 2002 |
| ACP Business Holdings Ltd | Financial services | 2024 |
| Across Analyse Ltd | Information & communication | 2021 |
| Active Network Services Ltd | Information & communication | 2016 |
| Active Network Solutions Limited | Information & communication | 2002 |
| Acumensa Consulting Ltd | Administrative & support | 2019 |
| Acute Audio Productions Limited | Administrative & support | 2012 |
| Adamantem Products Limited | Wholesale & retail | 2018 |
| Adar Real Estate Ltd | Real estate | 2025 |
| Addev Parafix Ltd | Extraterritorial | 2025 |
| Admodigital Limited | Professional & scientific | 2014 |
| ADS Consultancy Sussex Ltd | Professional & scientific | 2013 |
| Adsett Design Ltd | Professional & scientific | 2023 |
| Adur Home Care Ltd | Health & social care | 2023 |
| Adur Trading Ltd | Wholesale & retail | 2008 |
| Adur Valley Vets Limited | Professional & scientific | 2019 |
| Adur Voluntary Action | Other services | 2009 |
| Adventury XR Limited | Information & communication | 2024 |
| Aegis Data Solutions Ltd | Information & communication | 2023 |
| Aequitas Consultancy Ltd | Professional & scientific | 2025 |
| Aeronerd Limited | Transport & logistics | 2016 |
| AES HUT Ltd | Wholesale & retail | 2025 |
| Aesthetics of Sussex Ltd | Other services | 2020 |
| Affin Accounts Ltd | Financial services | 2026 |
| Agenor Training and Development Limited | Administrative & support | 1998 |
| Aidan Conlin Ltd | Hospitality | 2019 |
| Aimhigher Coaching Ltd | Health & social care | 2024 |
| Aitchison Associates Limited | Professional & scientific | 2001 |
| AJ Gordon & Sons Builders Limited | Construction | 2012 |
| AK Studios Architecture Limited | Information & communication | 2019 |
| Al-Aziz Solutions Ltd | Information & communication | 2024 |
| Alarmshock Ltd | Manufacturing | 2015 |
| Alden Accountants Ltd | Professional & scientific | 2011 |
| Aldingbourne Support Limited | Health & social care | 2022 |
| Aldous Clinical Research Consultancy Limited | Professional & scientific | 2022 |
| Alkhair Brother Ltd | Hospitality | 2025 |
| ALL Trails Ltd | Wholesale & retail | 2025 |
| ALL Types of Ltd | Construction | 2021 |
| Allied Law Ltd | Professional & scientific | 2017 |