| KRM Cast Holdings Limited | Financial services | 2021 |
| KRM Contractors Limited | Construction | 1996 |
| Krofman Trans Ltd | Transport & logistics | 2019 |
| Kronicle Investments Ltd | Real estate | 2019 |
| Kronicle Solutions Limited | Information & communication | 2015 |
| KS Bookkeeping & Accounts Ltd | Professional & scientific | 2023 |
| KS Logico Ltd | Professional & scientific | 2022 |
| Ksjm Ltd | Information & communication | 2014 |
| KSW Consulting Limited | Professional & scientific | 2024 |
| KTI Services Ltd | Professional & scientific | 2014 |
| Ktkosmetics Ltd | Wholesale & retail | 2025 |
| Kuboo Limited | Professional & scientific | 2010 |
| Kudnett Limited | Professional & scientific | 2021 |
| Kudos Assessments Limited | Education | 2014 |
| Kudos Support Ltd | Health & social care | 2024 |
| Kuldip Ltd | Wholesale & retail | 2012 |
| Kuldip Sahota Production Ltd | Information & communication | 2022 |
| Kumari Chand-Mayo Limited | Hospitality | 2016 |
| Kunbi Skin Ltd | Health & social care | 2023 |
| Kurdistan Barbers 1 Ltd | Other services | 2026 |
| Kvatech Ltd | Administrative & support | 2018 |
| Kwmb Ltd | Professional & scientific | 2026 |
| KWP Automation & Training Ltd | Professional & scientific | 2022 |
| KWR Associates Limited | Professional & scientific | 2014 |
| Kyrus Limited | Manufacturing | 2008 |
| L & C Refurb Limited | Construction | 2023 |
| L B Systems Limited | Construction | 2014 |
| L H Fire Ltd | Construction | 2023 |
| L J P Trading Ltd | Hospitality | 2018 |
| L K Carpentry & Building Services Ltd | Construction | 2019 |
| L N Taylor Limited | Professional & scientific | 2022 |
| L R D Consultancy Limited | Professional & scientific | 2024 |
| L W Townsend Limited | Professional & scientific | 2022 |
| L&C Construction & Groundworks Ltd | Construction | 2023 |
| L&C Dugdale Homes Ltd | Hospitality | 2025 |
| L&C Electrics Ltd | Construction | 2025 |
| L&F Consulting Limited | Professional & scientific | 2021 |
| L&J Full Delivery Ltd | Transport & logistics | 2017 |
| L&L White Appliances Ltd | Wholesale & retail | 2019 |
| L&P Installations Ltd | Construction | 2025 |
| L'S Kitchen Thai & Chinese Ltd | Hospitality | 2026 |
| L.E.R Electrical Services Ltd | Construction | 2019 |
| L.Griffiths&Sons Ltd | Wholesale & retail | 2026 |
| L.T.C.E. Soloutions Ltd | Information & communication | 2017 |
| LA Casita Ironbridge Ltd | Hospitality | 2022 |
| LAB Vegas Limited | Professional & scientific | 2016 |
| Labdorite Ltd | Health & social care | 2022 |
| Labfax Limited | Manufacturing | 2009 |
| Labocha & Upton Ltd | Real estate | 2010 |
| Ladin Limited | Wholesale & retail | 2015 |
| Lady of Ledger Bookkeeping Ltd | Professional & scientific | 2015 |
| Ladywell Manor Limited | Real estate | 2023 |
| Lakes Hotels Ltd | Hospitality | 2025 |
| Lakeside Plant Centre Limited | Wholesale & retail | 2004 |
| Lakeside Restaurant Limited | Hospitality | 2026 |
| Lakeview Restaraunt Ltd | Hospitality | 2026 |
| Lakhtree Estates Limited | Real estate | 2026 |
| Lakhtree Holdings Limited | Financial services | 2026 |
| Lalabo Ltd | Other services | 2022 |
| Laluna Property Investments Ltd | Real estate | 2024 |
| Lamb Developments NE Ltd | Real estate | 2024 |
| Lambda Manufacturing Limited | Manufacturing | 2008 |
| Lamia Ltd | Other services | 2019 |
| Land Referencing Academy Limited | Professional & scientific | 2015 |
| Land Referencing Consortium Limited | Professional & scientific | 2019 |
| Land Referencing Services LLP | | 2008 |
| Landau Court Management Company Limited | Administrative & support | 1989 |
| Landau Limited | Education | 1995 |
| Landlink Communications Ltd | Information & communication | 2020 |
| Landmark Computer Consultants Limited | Construction | 1997 |
| Landrina Ltd | Other services | 2023 |
| Langdale Housing & Compliance Ltd | Financial services | 2020 |
| Langthorpe Management Ltd | Real estate | 2021 |
| Langy's Lettings Limited | Real estate | 2022 |
| Lapd Solutions Ltd | Education | 2017 |
| Laper Ltd | Other services | 2020 |
| Lapis Enterprises Holdings Limited | Financial services | 2025 |
| Lapis Enterprises Property Limited | Financial services | 2025 |
| Lapis Home Limited | Financial services | 2020 |
| Larch Holdings Ltd | Agriculture & fishing | 2020 |
| Larese Ltd | Other services | 2020 |
| Larkspur & PT Limited | Professional & scientific | 2025 |
| Larnix Ltd | Administrative & support | 2020 |
| Larry Car Parts Limited | Wholesale & retail | 2016 |
| Laser Craft Workshop Ltd | Manufacturing | 2023 |
| Lash & Beauty Ltd | Other services | 2025 |
| Lash Glory Ltd | Wholesale & retail | 2021 |
| Lastiv Ltd | Other services | 2019 |
| Laugh & Learn Day Nursery Ltd | Health & social care | 2026 |
| Laura Butler Coaching Ltd | Other services | 2018 |
| Laures Ltd | Other services | 2019 |
| Lawley Hair and Beauty Ltd | Other services | 2024 |
| Lawleydp Limited | Health & social care | 2022 |
| Laws Design Limited | Professional & scientific | 2015 |
| Lazerland (UK) Ltd | Arts & recreation | 2012 |
| Lazo Limited | Real estate | 1981 |
| LCG Installations Ltd | Manufacturing | 2025 |
| LCR City Stay Ltd | Hospitality | 2025 |
| LDG Logistics Ltd | Administrative & support | 2025 |
| LDP BMS Consultancy Limited | Professional & scientific | 2021 |