| 1 Leta Umbrella Ltd | Professional & scientific | 2020 |
| 10 Granville Road Management Limited | Households | 2002 |
| 117 Ebury Street Tenants Limited | Households | 2014 |
| 161-178 Plowman Close Freehold Limited | Households | 2012 |
| 1LETA Finance Limited | Financial services | 2018 |
| 1ST Well Limited | Construction | 2025 |
| 23 Putney Hill Management Company Limited | Households | 2002 |
| 28 + 30 Hans Road Maintenance Limited | Households | 1975 |
| 30 Old Church Street (Freehold) Limited | Administrative & support | 2021 |
| 3A & R Properties Ltd | Wholesale & retail | 2018 |
| 3AR Business Solutions Ltd | Professional & scientific | 2019 |
| 3MS Paints Ltd | Manufacturing | 2017 |
| 4 Bryanston Square Freehold Limited | Households | 2017 |
| 4 Business Limited | Administrative & support | 1999 |
| 4 Ever Shine Ltd | Other services | 2022 |
| 4 Handel Street Limited | Households | 2005 |
| 4 Thought Limited | Information & communication | 1995 |
| 48 Gleneagle Road RTM Company Ltd | Households | 2015 |
| 49 Leicester Road Limited | Real estate | 2018 |
| 5 Bryanston Square Freehold Limited | Households | 2019 |
| 5 Half Moon ST. Management Limited | Households | 1986 |
| 52 ST Lukes Avenue Ltd | Households | 2010 |
| 84-86 Ritherdon Road Limited | Households | 2005 |
| 85 Edith Road RTM Company Ltd | Households | 2013 |
| 88 Accounting & Finance Ltd | Wholesale & retail | 2016 |
| 88-90 Ritherdon Road RTM Company Limited | Households | 2008 |
| 91 Cadogan Gardens RTM Company Limited | Households | 2005 |
| A Property Services Ltd | Construction | 2022 |
| A Star Communications Ltd | Information & communication | 2011 |
| A&T Transport Services (GB) Limited | Transport & logistics | 2014 |
| A-Tech Service Centre Ltd | Wholesale & retail | 2025 |
| A. J. Seeley Limited | Information & communication | 2006 |
| A.L. Mechanical Limited | Construction | 2023 |
| A.S. Handover Limited | Manufacturing | 1949 |
| A.S.T. Services Limited | Wholesale & retail | 1995 |
| A.S.T. Services Trustees Limited | Administrative & support | 2024 |
| A1 Food & Wine Ltd | Wholesale & retail | 2008 |
| A1A Taxis Limited | Transport & logistics | 2009 |
| A2C Support Services CIC | Education | 2025 |
| A99 Ltd | Education | 2013 |
| AAB Home Builds Ltd | Construction | 2020 |
| Aadhiraiyan Services Limited | Health & social care | 2026 |
| Aaidea Ltd | Information & communication | 2025 |
| Aajhziz Ltd | Wholesale & retail | 2025 |
| Aankh Limited | Administrative & support | 2016 |
| AB Dance LLP | | 2014 |
| AB Windows Group Limited | Administrative & support | 2017 |
| AB23 Ltd | Financial services | 2024 |
| Abbey Stationers Limited | Wholesale & retail | 1973 |
| Abhirush Capital Limited | Real estate | 2019 |
| Ability 2 Create Ltd | Education | 2014 |
| Absolute Blinds Limited | Construction | 2001 |
| Absolute Creative Media Limited | Professional & scientific | 2010 |
| Absolute Holidays Ltd | Administrative & support | 2024 |
| Absolute I T Recruitment Limited | Other services | 2017 |
| Absolute Recruit EOT Ltd | Extraterritorial | 2024 |
| Absolute Recruit Ltd | Other services | 2014 |
| ABU Promotions Ltd | Administrative & support | 2024 |
| Access Dental Ltd | Health & social care | 2008 |
| Accident Line Limited | Professional & scientific | 2013 |
| Accolade Measurement Ltd | Professional & scientific | 1993 |
| Accommodating Tastes Limited | Hospitality | 2018 |
| Accountancy Assist Ltd | Professional & scientific | 2013 |
| Accrofab Advanced Titanium Forming Limited | Manufacturing | 2011 |
| Ace WAX Limited | Wholesale & retail | 2020 |
| ACM & Partiners Ltd | Real estate | 2025 |
| Acme Pharma Ltd | Wholesale & retail | 2014 |
| Acorn Gritting Services Limited | Administrative & support | 2020 |
| Acorn Montessori School Limited | Education | 2005 |
| Acorn Services (Herts) Limited | Agriculture & fishing | 2012 |
| Acre Wood Day Nursery (Arlesey) Ltd | Health & social care | 2015 |
| Acumen Advisory Ltd | Professional & scientific | 2015 |
| Adam Bourn Creative Services Limited | Arts & recreation | 2013 |
| Adapa Consulting Limited | Professional & scientific | 2020 |
| Adaptive Management Ltd | Professional & scientific | 2020 |
| Adaptive Solutions Limited | Professional & scientific | 2015 |
| Adbrook Fire Protection Ltd | Construction | 2026 |
| ADC Alliance UK | Other services | 2026 |
| ADD Talent Network Limited | Arts & recreation | 2013 |
| Adele Avenue (Welwyn) Residents Ltd | Other services | 2018 |
| Adelfi Accounting and Bookkeeping Ltd | Professional & scientific | 2020 |
| Adop Studios Ltd | Information & communication | 2024 |
| Advanced Noise Solutions Limited | Professional & scientific | 2002 |
| Advantraq Business Services Limited | Information & communication | 2011 |
| AEG Power Solutions Ltd. | Manufacturing | 1946 |
| Aerosys Limited | Professional & scientific | 2008 |
| AF Automobile Ltd | Wholesale & retail | 2021 |
| Affectionate Living Care Ltd | Health & social care | 2024 |
| Affluence Property Management Ltd | Real estate | 2018 |
| Afpol Ltd | Wholesale & retail | 2025 |
| Afrasiab Limited | Wholesale & retail | 2024 |
| Afroz Holdings Ltd | Financial services | 2023 |
| Afroz Investments Limited | Real estate | 2024 |
| AFT Fluorotec Coatings Limited | Professional & scientific | 2007 |
| AFT Fluorotec Limited | Manufacturing | 1972 |
| Afterguard Ltd | Information & communication | 2020 |
| AG & AG Limited | Real estate | 2023 |
| AGC Green Ltd | Professional & scientific | 2025 |
| Agcd Consulting Ltd | Information & communication | 2025 |
| Ageless Labs Limited | Wholesale & retail | 2025 |