| James W Parker Limited | Construction | 2007 |
| Jansen UK Limited | Manufacturing | 2006 |
| JAX Properties Limited | Hospitality | 2001 |
| JD Knight Quantity Surveying LLP | | 2005 |
| Jdcd Financial Consultancy Limited | Financial services | 2006 |
| Jdfi Services Ltd | Administrative & support | 2022 |
| Jetlark Limited | Professional & scientific | 2023 |
| John Blaney Limited | Professional & scientific | 2000 |
| John Dorse Ltd | Agriculture & fishing | 2003 |
| John Heathcoat & Company (Holdings) Limited | Professional & scientific | 1984 |
| John HOW Carpets Limited | Wholesale & retail | 2007 |
| John Slater Planning Limited | Professional & scientific | 2016 |
| John T Jones & Co Limited | Professional & scientific | 2003 |
| JPS Land Limited | Real estate | 2025 |
| JSM Property Services Limited | Real estate | 2002 |
| Jukebox Property Ltd | Real estate | 2020 |
| K & M Butchers Limited | Wholesale & retail | 2003 |
| K a & T D Developments Limited | Construction | 2007 |
| K a & T D Williams Limited | Construction | 2005 |
| K J Hill Finance Limited | Financial services | 2008 |
| K J Stoneman & Co Limited | Professional & scientific | 2008 |
| K Moore & SON Limited | Construction | 1994 |
| K&M Delicatessen Ltd | Wholesale & retail | 2016 |
| K. Burn Building Contractors Limited | | 1988 |
| K.J. Howard Civil Engineering Limited | Water & waste | 1997 |
| K.P.W. Support Ltd | Hospitality | 2002 |
| Kaimoana Limited | Agriculture & fishing | 2003 |
| KAY Elliott Architects Limited | Professional & scientific | 1988 |
| Keans Limited | Wholesale & retail | 1995 |
| Keith Holder Kitchens & Bedrooms Limited | Wholesale & retail | 2003 |
| Kelkat Limited | Other services | 2007 |
| Kempley's Catch Limited | Hospitality | 2003 |
| Keogh Innovation Ltd | Information & communication | 2024 |
| Kerrihouse Limited | Households | 1978 |
| Kevin Down Building Services Limited | Construction | 2007 |
| Key West Properties Limited | Real estate | 2023 |
| Keypitts OFF Road Adventures Ltd | Arts & recreation | 2016 |
| KGM Plumbing & Heating Limited | Construction | 2006 |
| Kiastm Limited | Health & social care | 2007 |
| Kifat Ltd | Transport & logistics | 2018 |
| Kingswood Hotel Limited | Professional & scientific | 2004 |
| Kingwell Developments Limited | | 1986 |
| Kirk Radio (Exeter) Limited | Wholesale & retail | 1970 |
| Kirkhams Tyres Limited | Wholesale & retail | 1999 |
| Kitsungi Ltd | Health & social care | 2020 |
| KK Research Technology Limited | Manufacturing | 1993 |
| KMC Group Limited | Professional & scientific | 1999 |
| Knight & Maiden Limited | Other services | 2003 |
| Knight Scientific Limited | Manufacturing | 1990 |
| Koinonia Management Ltd. | Other services | 1992 |
| Kova Industries Limited | | 1994 |
| L C S Systems (UK) Limited | Construction | 2007 |
| L D Services (SW) Limited | Construction | 2026 |
| L J Brickwork Limited | Construction | 2006 |
| LA Pive Limited | Agriculture & fishing | 1998 |
| LA Rosaire Management Company Limited | Households | 2023 |
| Laboratoire Neustrie Ltd | Manufacturing | 1998 |
| Lacey Hickie & Caley Limited | Professional & scientific | 1991 |
| Lack Funeral Services (Holdings) Limited | Professional & scientific | 2006 |
| Ladys Mile Developments Limited | Financial services | 2005 |
| Laine Electrical Contractors Limited | Manufacturing | 2002 |
| Lamisell Beams Limited | Extraterritorial | 2005 |
| Lamisell Limited | Wholesale & retail | 2001 |
| Lammasfield Limited | | 1986 |
| Lancemarch Limited | Households | 1996 |
| Landflow Ltd | Professional & scientific | 1988 |
| Lands Road Property Company Limited | Professional & scientific | 2000 |
| Langridge Organic Farm Limited | Agriculture & fishing | 2007 |
| Lawrence & RAE Wholesale Fish Limited | Wholesale & retail | 2003 |
| LCA Services Limited | Professional & scientific | 2005 |
| Leach Brothers Limited | Construction | 2003 |
| Ledger Scaffolding Limited | Construction | 2007 |
| LEE Abbey Fellowship | Other services | 2002 |
| LEE Abbey Trust Limited | Professional & scientific | 1944 |
| Leepar Limited | Real estate | 2001 |
| Legal Skills Development Limited | Education | 2005 |
| Leigh Farm Gourmet Foods Limited | Manufacturing | 2007 |
| Leighton James Limited | Extraterritorial | 2005 |
| Leisureware Stores Ltd | Wholesale & retail | 1998 |
| Lemuria Contracting Ltd | Transport & logistics | 2017 |
| Lena Solutions Limited | Information & communication | 2007 |
| Lesewix Ltd | Manufacturing | 2018 |
| Lewis Davey Consulting Ltd | Administrative & support | 2018 |
| Lewis, Brookes & Company Limited | Professional & scientific | 2002 |
| LHC Group Limited | Financial services | 1997 |
| Lifestyle Lettings (South West) Limited | Real estate | 2003 |
| Lightsworn Media Ltd | Information & communication | 2024 |
| Lincombe Storage Limited | Transport & logistics | 2000 |
| Lings Leisure Limited | Arts & recreation | 2003 |
| Linkpinnacle Ltd | Other services | 2023 |
| Little Copse Garage Limited | Wholesale & retail | 2003 |
| Little Dog Productions Limited | Information & communication | 1998 |
| Little Oak Construction Limited | Wholesale & retail | 1988 |
| Little Silver Wood Limited | Administrative & support | 2018 |
| LJW Hepatology Consulting Ltd | Health & social care | 2025 |
| Lloyd Barnes Accountancy Recruitment Limited | Administrative & support | 2004 |
| LLPS4 Limited | Financial services | 2021 |
| Local V/Dubs Limited | Wholesale & retail | 2002 |
| London Land Investments Limited | Professional & scientific | 1999 |
| Longley Consulting Limited | Professional & scientific | 2006 |