| J. Gordon (Builders) Limited | Real estate | 1967 |
| J.D. Construction (Midlands) Limited | | 1968 |
| J.M.Frier Limited | | 1963 |
| JD Agility LLP | | 2008 |
| JDG Electrical Contractors Limited | Construction | 2003 |
| Jensen Publishing Limited | | 1984 |
| John Caden Security & Investigations Limited | Other services | 2018 |
| John Hanlon & Co. Limited | Administrative & support | 1977 |
| John R. Ford and Sons (Shefford) Limited | Wholesale & retail | 1967 |
| John R.Ford & Sons Limited | Financial services | 1963 |
| JS Focus Properties Limited | Real estate | 2017 |
| K H Networks Limited | Transport & logistics | 2006 |
| K.M. (Advertising) Limited | | 1971 |
| Kara Chicken Limited | Hospitality | 2025 |
| Kash Transport Limited | Transport & logistics | 2017 |
| Kashmir Goldsmith Limited | Other services | 2017 |
| Kiemera Limited | Financial services | 2004 |
| L W Vass Holdings Limited | Real estate | 1996 |
| L.W. Management Limited | Professional & scientific | 1990 |
| Lakshmi Construction Limited | Wholesale & retail | 2003 |
| Lawrence Investments (Luton) Limited | | 1957 |
| Linden Court Management Company (Bournemouth) Limited | Households | 1989 |
| Lockheed Martin UK Ampthill Limited | Manufacturing | 1957 |
| London Gliding Club Proprietary Limited | Arts & recreation | 1931 |
| Longhalf Limited | | 1988 |
| Luton Camera Repair Services Limited | Professional & scientific | 1977 |
| Luton Hotels Limited | Hospitality | 2003 |
| M.J.F. (Luton) Limited | | 1986 |
| Made to Make a Difference Services Limited | Health & social care | 2024 |
| Magstripe Limited | Manufacturing | 1990 |
| Mainline & Metro Engineering Ltd | Construction | 2016 |
| Mandeville Premier Limited | Other services | 2017 |
| Manning & Co (Life & Pensions) Limited | | 1976 |
| Market(Ears Ukeig | | 1999 |
| Mashal Traders Limited | Transport & logistics | 2017 |
| Mass Racing Ltd | Professional & scientific | 2015 |
| Mertech Beds Electrical Limited | | 1965 |
| Michael Browne Associates Ltd. | Professional & scientific | 2005 |
| MR B Autos Ltd | Wholesale & retail | 2018 |
| National Bingo Game Association Limited(The) | Arts & recreation | 1986 |
| Neal Anthony Wealth Ltd | Financial services | 2019 |
| Newstaff Employment Services Limited | Administrative & support | 2006 |
| Newton Park Farm Limited | Agriculture & fishing | 1933 |
| Nexela Communications Ltd | Wholesale & retail | 2005 |
| Oakley Drylining Ltd | Construction | 2004 |
| Oilplan Limited | | 1980 |
| Open House Luton Ltd | Real estate | 2017 |
| ORS Limited | Professional & scientific | 2004 |
| P & P Community Services Ltd | Health & social care | 2003 |
| P and R Travel Agency Limited | Administrative & support | 1990 |
| Parasol Home Improvements Limited | | 1986 |
| Path Transport Limited | | 1979 |
| PCR Contracting Limited | Agriculture & fishing | 2002 |
| Peek Building Limited | Construction | 2003 |
| Penny Foster Accounting Services Limited | Professional & scientific | 2004 |
| Personal Computer Systems Integration Limited | Information & communication | 1996 |
| Philip C Bath Limited | Agriculture & fishing | 1954 |
| Philip Harvey Associates Limited | Professional & scientific | 2002 |
| Polar Events Ltd | Hospitality | 2006 |
| Pondlease Limited | | 1986 |
| Powell Quality Flooring Limited | Construction | 2006 |
| Premier Glazing Systems (Ampthill) Limited | | 1985 |
| PRI Trans Limited | Transport & logistics | 2018 |
| Proving Applications Limited | Information & communication | 2007 |
| R P Gray Limited | Construction | 2003 |
| R. Burgoyne Limited | Administrative & support | 2003 |
| R.G. Electrical Services Limited | Manufacturing | 2006 |
| RA & AA Limited | Transport & logistics | 2017 |
| Red House Global Ltd | Wholesale & retail | 2007 |
| Restart Resources Limited | Education | 2001 |
| Riotous Assembly Limited | Information & communication | 1991 |
| Riverside Towers LLP | | 2007 |
| Robert Yates (Shopfitters) Limited | | 1967 |
| Roco Plant Hire Limited | | 1980 |
| S J Davies Electrical Limited | Construction | 2006 |
| S.L. Services Limited | | 1983 |
| Sandybrook Limited | | 1986 |
| Scarpcrest Limited | | 1980 |
| Shefford Building Supplies Limited | Wholesale & retail | 1973 |
| Simran Development T/A Atlas Land & Development Ltd | Real estate | 2004 |
| Sky High Travel Limited | Administrative & support | 2006 |
| Slipend Haulage Limited | | 1973 |
| Smart FA Limited | Education | 2017 |
| Spantech Limited | Information & communication | 2011 |
| SPD Carpets Limited | Construction | 2006 |
| Spectrum Acoustic Consultants Limited | Professional & scientific | 1989 |
| Splash Clothing Company Limited | Wholesale & retail | 2004 |
| Stapbourne Limited | | 1976 |
| STD Civils Limited | Water & waste | 2006 |
| Steele Ceilings Limited | Administrative & support | 2015 |
| Stephens Haulage Limited | Transport & logistics | 1966 |
| Stopsley Properties Ltd | Real estate | 2010 |
| Surefire Ideas Limited | Information & communication | 2005 |
| Surma Valley Ltd | Transport & logistics | 2012 |
| T & J W Limited | Real estate | 2003 |
| T.J. Bates & SON | Agriculture & fishing | 1958 |
| THE Bedford Cable Co. Limited | | 1989 |
| THE Bismillah Charity | Administrative & support | 2005 |
| THE Water Club Limited | Transport & logistics | 1989 |
| Three Thirteen MAK Limited | Professional & scientific | 2017 |