| Kidz 1ST Ltd | Education | 2007 |
| Kikapu Limited | Wholesale & retail | 2002 |
| Kilmorey Court Limited | Households | 1986 |
| Kilsin Limited | Administrative & support | 2006 |
| Kimhalliday Limited | Information & communication | 2002 |
| Kimti Investments Limited | Construction | 2002 |
| Kinderoos Limited | Education | 2005 |
| Kindmulti Limited | Administrative & support | 1992 |
| Kinergy UK Ltd | Wholesale & retail | 2007 |
| Kingbrook Properties Limited | Real estate | 2001 |
| Kings Precision Limited | Other services | 2005 |
| Kingsbury Windows Limited | Construction | 2003 |
| Kingsley Barber Shop Ltd | Other services | 2023 |
| Kingsmith Limited | Real estate | 2007 |
| Kingsthorpe Care Limited | Health & social care | 2007 |
| Kingston Wild Flowers Limited | Administrative & support | 2004 |
| Kingstone Ornamental Stoneware Limited | Administrative & support | 2005 |
| Kingsway Locks Limited | Administrative & support | 2003 |
| Kingswood Creek Management Company Limited | Households | 2008 |
| Kinnective Care Limited | Health & social care | 2023 |
| Kinomatic Pictures Limited | Information & communication | 2023 |
| Kirun IT Solutions Ltd | Professional & scientific | 2018 |
| KIT Chan Chef at Home Limited | Hospitality | 2000 |
| Kitchen Tech Ltd | Wholesale & retail | 1998 |
| Kitchens South East PLC | | 2000 |
| KK Chicken & Pizza Ltd | Hospitality | 2019 |
| KK Pharma Ltd | Wholesale & retail | 2022 |
| KK UK Management Ltd | Real estate | 2020 |
| KKS Developers Ltd | Construction | 2023 |
| Klima Limited | Professional & scientific | 2007 |
| Klor Ltd | Administrative & support | 2007 |
| KM Lawyers Limited | Professional & scientific | 1989 |
| KM7 Investments Ltd | Administrative & support | 2018 |
| KM7 Ltd | Administrative & support | 2018 |
| KMC UK Limited | Wholesale & retail | 1999 |
| Knightbourn Limited | Other services | 1995 |
| Knights-Modak Developments Ltd. | Real estate | 2007 |
| Knightsgate Partners Limited | Professional & scientific | 2014 |
| Knky Limited | Other services | 2007 |
| Knox Advisory Limited | Professional & scientific | 2016 |
| Koliqi Marble Ltd | Construction | 2003 |
| Koosag Investments Limited | Construction | 1996 |
| Korahi Ltd | Hospitality | 2025 |
| Korbond Industries Limited | Wholesale & retail | 1983 |
| Korinnia Limited | Hospitality | 2025 |
| KP Automobile PVT Limited | Wholesale & retail | 2006 |
| KP Property Developers Limited | Real estate | 2021 |
| Kpmc Limited | Professional & scientific | 1996 |
| Kprs Consultants Ltd | Construction | 2007 |
| KPS Properties Limited | Real estate | 2004 |
| Kril Limited | Information & communication | 2000 |
| Krinil Ltd | Wholesale & retail | 2024 |
| Krintech Limited | Manufacturing | 2007 |
| Krwn Limited | Information & communication | 2020 |
| Kryltd Ltd | Manufacturing | 2015 |
| Krystal London Limited | Manufacturing | 2001 |
| KS Property Ventures LLP | | 2022 |
| KSE Hospitality Ltd | Hospitality | 2020 |
| Ksmv Properties Limited | Real estate | 2020 |
| KSS Engineering Ltd | Construction | 2006 |
| KSS Project Services Limited | Professional & scientific | 2007 |
| KTS Consulting Limited | Information & communication | 1998 |
| Kufaan Medical Ltd | Information & communication | 1985 |
| KUW Consulting Ltd | Professional & scientific | 2001 |
| KW Media Systems Ltd | Manufacturing | 2017 |
| Kyvsai Limited | Financial services | 2024 |
| L & L Restaurants Limited | Real estate | 1976 |
| L & P Enterprises Limited | Health & social care | 1966 |
| L D H Grab Services Ltd | Construction | 2003 |
| L P Patel & Co Limited | Professional & scientific | 2007 |
| L Smith Construction Ltd | Construction | 2007 |
| L' Ecole DE Ballet Ltd | Education | 2020 |
| L'Artiste Affame Limited | Hospitality | 1994 |
| L.I.M.O Property Services Ltd | Real estate | 2023 |
| LA Source Consulting Limited | Information & communication | 2007 |
| La-Mac Transport Limited | Information & communication | 2000 |
| Labib Trans Enterprise Limited | Information & communication | 1998 |
| Laboratorie Medicals Limited | Other services | 2003 |
| Lake Accountancy Services Limited | Professional & scientific | 1997 |
| Lambda Advanced Technology Limited | Professional & scientific | 2002 |
| Lamber & Sons Limited | Construction | 2003 |
| Lambpalm Limited | Construction | 1976 |
| Lancer Consulting Limited | Professional & scientific | 2006 |
| Landmark Property London Holdings Ltd | Real estate | 2016 |
| Langbrights Limited | Professional & scientific | 1999 |
| Language Safaris Limited | Education | 1991 |
| Lannis Peta Spiro Limited | Professional & scientific | 2001 |
| Lapraya Ltd | Extraterritorial | 2003 |
| Lapstone Investments Limited | Real estate | 2002 |
| Larchwood Enterprises Limited | Households | 1989 |
| Larcom Systems Limited | Financial services | 2019 |
| Laretta Limited | Health & social care | 2005 |
| Laser Joinery UK Ltd | Construction | 2001 |
| Latal Services Limited | Information & communication | 2005 |
| Latent Energy Services Ltd | Construction | 2024 |
| Laudan Limited | Wholesale & retail | 2018 |
| Laurant Properties Limited | Real estate | 2002 |
| Laurel Park Management Company Limited | Real estate | 2002 |
| Laurel Property Holdings Limited | Real estate | 2021 |
| Laurence Factor & Co. Limited | Other services | 2003 |