| 4ORTY4 Ltd | Construction | 2011 |
| 4SZN Studios Ltd | Wholesale & retail | 2023 |
| 4X4 Vehicle Hire Limited | Administrative & support | 2011 |
| 5 & 6 Fieldview Limited | Real estate | 2006 |
| 5 Star Building Solution Ltd | Construction | 2024 |
| 54 Wellesley Road Management Limited | Households | 2018 |
| 56/56A Victoria Street Freehold Company Ltd | Households | 2010 |
| 59 High Street Management Limited | Households | 1989 |
| 5B3A Limited | Health & social care | 2021 |
| 60 ELM Park Road Limited | Real estate | 2023 |
| 60 Warwick Gardens Limited | Households | 1987 |
| 63 Tring Road Residents Company Limited | Households | 1994 |
| 65 Perham Road Management Limited | Households | 1994 |
| 7 Star Detailing Ltd | Administrative & support | 2024 |
| 75 Hindes Road Management Limited | Households | 2018 |
| 7VEN Group Ltd | Real estate | 2025 |
| 8-14 Poole Close RTM Company Limited | Households | 2026 |
| 8080 Network Solutions Limited | Information & communication | 2012 |
| 8X8 Communications UK Limited | Extraterritorial | 2012 |
| 8X8 UK Limited | Information & communication | 2004 |
| 9 Castletown Road Management Limited | Households | 1986 |
| 9 SNR Limited | Information & communication | 2024 |
| 900 Cafe Limited | Hospitality | 2023 |
| 93 Developments Ltd | Construction | 2021 |
| 94 Coffee Shop Ltd | Hospitality | 2015 |
| 97 Investments Ltd | Real estate | 2022 |
| 9INE0210 Ltd | Wholesale & retail | 2025 |
| A & B Landscapes and Design Limited | Administrative & support | 2020 |
| A & C Prime Properties Ltd | Real estate | 2026 |
| A + B Systems Ltd. | Wholesale & retail | 1993 |
| A 2 Z Lifting Ltd | Construction | 2025 |
| A Archway Ltd | Hospitality | 2024 |
| A Better Way Consulting Ltd | Professional & scientific | 2021 |
| A C King Construction Ltd | Construction | 2016 |
| A C R S Cleaning Services Limited | Administrative & support | 2023 |
| A CAB Group Ltd | Transport & logistics | 2025 |
| A Daddy Yaad Limited | Wholesale & retail | 2025 |
| A Deus Consultancy Limited | Administrative & support | 2015 |
| A E M Associates Luton Limited | Information & communication | 1938 |
| A for Alfa Ltd | Wholesale & retail | 2026 |
| A Ford Heating Services Ltd | Professional & scientific | 2021 |
| A Great British Clean Tech Recycling Company Limited | Administrative & support | 2024 |
| A Hill Marketing Ltd | Professional & scientific | 2026 |
| A J Andrews Limited | Agriculture & fishing | 1952 |
| A J Cope Builders Limited | Construction | 2011 |
| A J F Motor Engineers Limited | Wholesale & retail | 2007 |
| A J G Automotive Limited | Wholesale & retail | 2016 |
| A K Anaesthetics Limited | Health & social care | 2014 |
| A K Tera Tech Limited | Manufacturing | 2014 |
| A Lane Homes Ltd | Real estate | 2023 |
| A Maid for ALL Commercial Cleaning Ltd | Administrative & support | 2023 |
| A Marked Difference Ltd | Professional & scientific | 2010 |
| A Mcdonagh Medical Limited | Health & social care | 2016 |
| A N S Stores Ltd | Wholesale & retail | 2022 |
| A P Landscaping and Building Services Ltd | Administrative & support | 2012 |
| A Perfect Planet Solar Farm Limited | Construction | 2021 |
| A Proper Logistic Limited | Transport & logistics | 2018 |
| A Roastery Ltd | Manufacturing | 2022 |
| A Smart Move Residential Limited | Real estate | 2019 |
| A Star Services South Ltd | Wholesale & retail | 2011 |
| A Taste of Home (Wingrave) Ltd | Hospitality | 2024 |
| A to Z Plumbing & Building Ltd | Construction | 2019 |
| A Weatherhead Drainage Ltd | Water & waste | 1991 |
| A Weatherhead Ltd | Other services | 1999 |
| A&A PM Ltd | Construction | 2024 |
| A&B Transport Ltd | Transport & logistics | 2014 |
| A&G Raised Access Floors Ltd | Construction | 2019 |
| A&K Temp Staffing Ltd | Administrative & support | 2024 |
| A&L Bespoke Design Ltd | Extraterritorial | 2024 |
| A&M Fabrics Limited | Wholesale & retail | 2020 |
| A&O Property Solutions Ltd | Wholesale & retail | 2023 |
| A&O Woodwork Ltd | Construction | 2016 |
| A&R Educational Services Ltd | Education | 2019 |
| A&S Wilkes Properties Ltd | Real estate | 2023 |
| A-Cabb Ltd | Transport & logistics | 2023 |
| A-Fix Scaffolding Services Ltd | Construction | 2011 |
| A-Z Strategy & Corporate Finance Limited | Financial services | 2024 |
| A. Weatherhead Drilling Services Limited | Construction | 2002 |
| A. Weatherhead Holdings Ltd | Real estate | 1995 |
| A.B.Jenson Electrical Services Limited | Construction | 2014 |
| A.D.E Estate Planning Limited | Other services | 2023 |
| A.D.T.J Limited | Transport & logistics | 2024 |
| A.K.Hughes Limited | Manufacturing | 1962 |
| A.Lorraine Wall Art & Portraits Ltd | Arts & recreation | 2026 |
| A.P.Productions Entertainment & Events Limited | Arts & recreation | 2007 |
| A.S & Sons Design and Build Limited | Construction | 2023 |
| A.S. Howes & Co Limited | Professional & scientific | 2001 |
| A1 Building & Landscaping Ltd | Construction | 2018 |
| A1 Designs and Drafting Limited | Professional & scientific | 2013 |
| A1 Martial Arts Ltd | Education | 2023 |
| A2D Transport Ltd | Transport & logistics | 2024 |
| A2Z Hvac Ltd | Manufacturing | 2025 |
| A2Z Luton Limited | Transport & logistics | 2026 |
| A2Z Peri Peri Limited | Hospitality | 2017 |
| A2Z Roofing and Builders Limited | Construction | 2016 |
| A4 Capital Ltd | Financial services | 2023 |
| A4 Services UK Limited | Professional & scientific | 2018 |
| A41 Cabs Limited | Transport & logistics | 2019 |
| AA & S Services Ltd. | Administrative & support | 2006 |
| AA Roofing Services Limited | Construction | 2017 |