| 10 Acres Limited | Administrative & support | 2013 |
| 12 Manvers Street Management Company Ltd | Households | 2015 |
| 121 Beer Limited | Professional & scientific | 2004 |
| 1880 Properties Ltd | Real estate | 2022 |
| 1908 Projects Limited | Construction | 2026 |
| 1ST Choice Pallet Racking Services Ltd | Other services | 2015 |
| 1ST Class Tyres & Autocare Limited | Wholesale & retail | 2005 |
| 2 Wheel Service Limited | Wholesale & retail | 2011 |
| 24/7 Online Limited | Information & communication | 2005 |
| 26 Crondace Road Management Company Limited | Real estate | 1997 |
| 27 Budock Terrace Management Limited | Households | 2024 |
| 27 Kilmorie Road (Freehold) Limited | Hospitality | 2009 |
| 2ES Limited | Energy | 1998 |
| 360 Recruitment Professionals Ltd | Administrative & support | 2013 |
| 360 TBG Ltd | Real estate | 2023 |
| 360 TWS Limited | Transport & logistics | 2023 |
| 37 Print Ltd | Manufacturing | 2023 |
| 3B Futures Limited | Real estate | 2023 |
| 3D Filaprint Limited | Wholesale & retail | 2019 |
| 3M Resourcing Ltd | Administrative & support | 2023 |
| 3SIX5 (UK) Limited | Administrative & support | 2012 |
| 40 Bath Street Freehold Ltd | Real estate | 2023 |
| 400M Ltd | Real estate | 2021 |
| 4X4 Vehicle Hire UK Limited | Administrative & support | 2013 |
| 511 Change Consultancy Ltd | Professional & scientific | 2022 |
| 8-BIT Carpenter Ltd | Information & communication | 2020 |
| 88 Films Ltd. | Information & communication | 2012 |
| A & a Lamb Limited | Construction | 2000 |
| A B Medics (UK) Ltd | Health & social care | 2011 |
| A Duncan Plumbing and Heating Ltd | Construction | 2024 |
| A F Electrical Services Limited | Construction | 2007 |
| A Gvaramadze Ltd | Health & social care | 2022 |
| A J Best Limited | Other services | 2006 |
| A Othman Limited | Other services | 2012 |
| A P Dynamic Ltd | Transport & logistics | 2020 |
| A R Banerjee Limited | Health & social care | 2006 |
| A T Contracting & Plant Hire Ltd | Construction | 2012 |
| A W Bespoke Builders Limited | Construction | 2022 |
| A&A Holiday Homes Ltd | Hospitality | 2023 |
| A&A RAD Limited | Health & social care | 2021 |
| A&Z MRF Ltd | Professional & scientific | 2024 |
| A. Emerson Consultancy Ltd | Professional & scientific | 2018 |
| A.B.R. Vehicle Glazing Ltd | Wholesale & retail | 2005 |
| A2B Media Ltd | Information & communication | 2003 |
| A2GR Limited | Real estate | 2018 |
| A5 Truck & Trailer Repair Ltd | Wholesale & retail | 2023 |
| AA Dewes & Sons Limited | Agriculture & fishing | 2016 |
| AAK Urology Ltd | Health & social care | 2025 |
| Aayee Ltd | Real estate | 2015 |
| Abbie Mathew's Ltd | Hospitality | 2024 |
| Abbie Print Ltd | Manufacturing | 2015 |
| Aberdeen 2023 Ltd | Construction | 2023 |
| ABI Central Store Limited | Wholesale & retail | 2026 |
| Abnb Ltd | Administrative & support | 2009 |
| ABR Vehicle Solutions Ltd | Wholesale & retail | 2023 |
| Absg Limited | Other services | 2019 |
| Absimran Ltd | Hospitality | 2023 |
| Absolute Machine Tools Ltd | Manufacturing | 2024 |
| Abstract Design to Light Limited | Extraterritorial | 2004 |
| Abstract Engineering Limited | Manufacturing | 2024 |
| Abstract Lighting Limited | Extraterritorial | 2010 |
| Academy for Healthcare Science Limited | Professional & scientific | 2011 |
| Acceler Ltd | Administrative & support | 2009 |
| Ace Connections Limited | Wholesale & retail | 1996 |
| Aceley Consultancy Ltd | Administrative & support | 2017 |
| ACL Fire & Security Limited | Administrative & support | 2009 |
| ACM Interior Design Ltd | Other services | 2010 |
| ACM Maintenance Limited | Manufacturing | 2009 |
| Acme Care Limited | Health & social care | 2001 |
| Acorn Leadership Development Limited | Professional & scientific | 2023 |
| Acothane UK Limited | Wholesale & retail | 2015 |
| Acqman Consulting Limited | Professional & scientific | 2010 |
| Across the Road Films Limited | Information & communication | 2024 |
| Acrylic 2 U Ltd | Wholesale & retail | 2022 |
| AD Orthopaedics Ltd | Health & social care | 2022 |
| AD Tools and Plastics Ltd | Wholesale & retail | 2024 |
| Adamara Ltd | Transport & logistics | 2014 |
| Adapt Displays Retail Manufacturing Ltd | Wholesale & retail | 2017 |
| ADC Interior Concepts Limited | Other services | 2008 |
| Adjust-It Consultants Ltd | Information & communication | 2026 |
| Admire Property Ltd | Real estate | 2023 |
| Adore Hair and Beaute Ltd | Other services | 2026 |
| ADS Services (Leics) Ltd | Other services | 2019 |
| Advance Print Solutions Limited | Manufacturing | 2018 |
| Advance Property Investments Limited | Real estate | 1954 |
| Advanced Electrical Services (Leicester) Limited | Construction | 1999 |
| Advanced Measurement Group Ltd | Professional & scientific | 2018 |
| Advectus Consulting Ltd | Professional & scientific | 2026 |
| Advent Trust Limited | Health & social care | 2024 |
| Adverse Orbit Ltd | Health & social care | 2021 |
| Aegis Africa Limited | Professional & scientific | 2018 |
| Aegis Auto Ltd | Wholesale & retail | 2025 |
| Aequitas Commercial Services Ltd | Administrative & support | 2018 |
| Aeres Capital Holdings Ltd | Financial services | 2020 |
| Aeron Ltd | Wholesale & retail | 2026 |
| Agalion Ltd | Real estate | 2025 |
| AGH Global Search Ltd | Administrative & support | 2024 |
| Agim Consulting Ltd | Information & communication | 2023 |
| Agnosco Consulting Limited | Other services | 2012 |
| AGS Carpentry & Maintenance Solutions Ltd | Construction | 2015 |