| 01855610 Limited | | 1984 |
| 104 Oval Road Limited | Real estate | 2016 |
| 10PT Limited | Wholesale & retail | 2014 |
| 12 Mazenod Avenue Ltd | Households | 1999 |
| 23 Barton Road Ltd | Real estate | 2024 |
| 33 Club CIC | Hospitality | 2025 |
| 349 Design Ltd | Professional & scientific | 2008 |
| 35 Foods Ltd | Administrative & support | 2006 |
| 360 Project Management Consulting Limited | Professional & scientific | 2021 |
| 4 Seconds Limited | Professional & scientific | 2010 |
| 46 Barton Road Ltd | Real estate | 2024 |
| 4OUR Services Limited | Wholesale & retail | 2007 |
| 5 Kites Education Ltd | Education | 2021 |
| A & H Joinery Associates Ltd | Manufacturing | 2022 |
| A & M Black Associates Ltd. | Education | 2015 |
| A J Barry Rotor Training and Consultancy Limited | Other services | 2017 |
| A J Hawes Ltd | Wholesale & retail | 2026 |
| A P Contractors Limited | Administrative & support | 2003 |
| A Pridham Coaching & Consulting Limited | Professional & scientific | 2024 |
| A to B Recruitment Limited | Administrative & support | 2016 |
| A&F GAS Services Ltd | Administrative & support | 2017 |
| A&N Productions Limited | Arts & recreation | 2017 |
| A&T Collectables Limited | Wholesale & retail | 2025 |
| A. Pignone Services Ltd | Other services | 2013 |
| A.G. Evans Holdings Limited | Professional & scientific | 1998 |
| A.G. Evans Properties Limited | Real estate | 1998 |
| A.G.E. Beauty Services Ltd | Manufacturing | 2022 |
| A.J. Barber Limited | Construction | 1996 |
| A.J. Groom & SON Limited | Agriculture & fishing | 2003 |
| A.J.A. Taylor and Company Limited | Construction | 1922 |
| A.L.F. Productions Limited | Information & communication | 1999 |
| A.R. Glazing & Building Services Limited | Construction | 2000 |
| A.Tan Consultancy Ltd | Professional & scientific | 2019 |
| A.V.Hessel Limited | Real estate | 1959 |
| Aahh Trading Limited | Hospitality | 2016 |
| Abishia Limited | Wholesale & retail | 2020 |
| Abstack Ltd | Information & communication | 2019 |
| ACB Coaching Limited | Other services | 2014 |
| Access Integrated Systems Limited | Administrative & support | 2004 |
| Accountring Limited | Professional & scientific | 2017 |
| Ace London Limited | Administrative & support | 2017 |
| Ace People Limited | Professional & scientific | 2018 |
| Acorn Building Services (Bucks) Limited | Construction | 2009 |
| ACT One Studio Limited | Professional & scientific | 2024 |
| Action Computing Limited | Information & communication | 2019 |
| Actioncoach West Dorset Ltd | Professional & scientific | 2021 |
| Active Fire Safety Limited | Public administration | 1998 |
| Actuarial Intelligence Ltd | Information & communication | 2020 |
| Acuitas Consultants Limited | Information & communication | 2024 |
| Adams Management Limited | Construction | 2015 |
| Adaptare Ltd | Administrative & support | 2024 |
| Adaptive Decisions Ltd | Information & communication | 2023 |
| Adcallidus Consulting Limited | Information & communication | 2024 |
| Adept IT Solutions Ltd | Information & communication | 2019 |
| Adeptstar Limited | Professional & scientific | 2019 |
| Adhere Ltd | Administrative & support | 2015 |
| Adhesive Brokers Ltd | Wholesale & retail | 2023 |
| Adlington Young Ltd | Professional & scientific | 2016 |
| Adminuser Limited | Real estate | 1998 |
| ADP Communication Services Limited | Information & communication | 2015 |
| Adrian Cole Frics Limited | Professional & scientific | 1999 |
| Adult Social Care Law Limited | Other services | 2019 |
| Advantage AI Limited | Information & communication | 2024 |
| Advantage Sourcing Limited | Professional & scientific | 2024 |
| Advising Today Ltd | Real estate | 2024 |
| Aedisz Ltd | Professional & scientific | 2024 |
| Aesop Business Park (Management) Limited | Other services | 2019 |
| Aeternum Cornell Ltd | Financial services | 2025 |
| Aevitas Solutions Ltd | Information & communication | 2019 |
| Affina Search Ltd | Administrative & support | 2017 |
| Afkari Ltd | Education | 2022 |
| AGE Ceramics Ltd | Construction | 2023 |
| Ageequneek Limited | Administrative & support | 2020 |
| Agency Management Ltd | Other services | 2001 |
| Agha Ivan Lounge Ltd | Hospitality | 2026 |
| Agile Floworks Limited | Information & communication | 2018 |
| Agilis Limited | Information & communication | 2018 |
| Agilis Mobile Limited | Information & communication | 2017 |
| Agtech Talent Solutions Limited | Administrative & support | 2024 |
| Agyapp Ltd | Information & communication | 2019 |
| Ah-Eng Limited | Professional & scientific | 2026 |
| AIC Quattro Automotive Ltd | Wholesale & retail | 2018 |
| Aitch GEE Training Limited | Education | 2012 |
| Aitkins Property Services Ltd | Real estate | 2016 |
| AJ Reward Limited | Administrative & support | 2019 |
| Aj's Cutz Ltd | Extraterritorial | 2025 |
| AJA Taylor Investments Ltd | Real estate | 2016 |
| AJF Property Holdings Ltd | Real estate | 2026 |
| AJK Finance Systems Ltd | Professional & scientific | 2024 |
| AJM Consultancy Limited | Information & communication | 2021 |
| AJP Mobile Valeting Services Ltd | Administrative & support | 2023 |
| AJR Spark Limited | Information & communication | 2024 |
| Akeman Salon Ltd | Other services | 2026 |
| Akumar Consulting Limited | Information & communication | 2020 |
| Alan Donald & Company Ltd | Financial services | 2014 |
| Aldbury Community Support | Other services | 2020 |
| Alex Watkins Consulting Limited | Information & communication | 2014 |
| ALH Property Maintenance Limited | Construction | 2020 |
| Alice Kane Properties Ltd | Real estate | 2025 |
| Align & Scale Ltd | Professional & scientific | 2026 |