| Karsan Catering Ltd | Hospitality | 2023 |
| Kash Logistics Ltd | Transport & logistics | 2024 |
| Katang Limited | Professional & scientific | 2008 |
| Keates & Co Accountants Ltd | Professional & scientific | 2022 |
| Keates & Co Probate Services Ltd | Professional & scientific | 2016 |
| Keddie Consultancy & Coaching Ltd | Professional & scientific | 2022 |
| Kelvinbrae Limited | Professional & scientific | 2005 |
| Kenilworth 1969 Limited | Extraterritorial | 2015 |
| Kenilworth Management (UK) Limited | Real estate | 2019 |
| Kensington Court RTM Company Ltd | Households | 2008 |
| Kensington Mews Management Company Limited | Households | 2014 |
| Keste Tax & Accounting Limited | Professional & scientific | 2014 |
| Kevin Chorley Limited | Construction | 2010 |
| Kevin Horn Butchers Ltd | Wholesale & retail | 2024 |
| KEW Ventures Limited | Professional & scientific | 2010 |
| Key Objective Operations Ltd | Real estate | 2025 |
| Keyincode Ltd | Professional & scientific | 2017 |
| Keystone Resilience Limited | Professional & scientific | 2010 |
| Khipu Holdings Limited | Administrative & support | 2012 |
| Khipu Networks Limited | Information & communication | 2004 |
| KICK512 (Television) Ltd | Information & communication | 2020 |
| Killeen Property Investments Ltd | Real estate | 2026 |
| Kind Lines & Little Feelings Ltd | Other services | 2025 |
| Kings Road (Fleet) Management Limited | Households | 2003 |
| Kingscote Construction Limited | Construction | 2021 |
| Kingswood Concepts Limited | Administrative & support | 2007 |
| Kinney Property One Ltd | Real estate | 2026 |
| Kinsol Ltd | Construction | 2026 |
| Kitc Limited | Construction | 2025 |
| KJB Hart Accountancy Services Ltd | Professional & scientific | 2017 |
| KJM Hairdressers Ltd | Other services | 2017 |
| Kl-Roofing Ltd | Construction | 2022 |
| KM Joinery & Property Services Ltd | Construction | 2021 |
| Knoll Court Fleet Residents Association Limited | Professional & scientific | 1971 |
| KNP Retail Ltd | Wholesale & retail | 2026 |
| Kore Garden Architecture Ltd | Construction | 2026 |
| Korrect SW Limited | Administrative & support | 2009 |
| Kraam Limited | Information & communication | 2022 |
| KS & Sons Ltd | Real estate | 2023 |
| KSD Accountancy Limited | Professional & scientific | 2017 |
| Kudhoyah Limited | Health & social care | 2016 |
| Kurdish Barbers & Hairstyles Limited | Other services | 2019 |
| Kwota Ltd | Information & communication | 2020 |
| Kyle Healthcare Services Ltd | Health & social care | 2016 |
| L & S Buckland Limited | Construction | 2024 |
| L B Farm Limited | Real estate | 2002 |
| L P D Projects Limited | Professional & scientific | 1997 |
| Labram Holmes Limited | Real estate | 2022 |
| Lagoon Fourteen Limited | Financial services | 2025 |
| Lakaya Limited | Hospitality | 2025 |
| Lambert & Macfarlane Electrical Ltd | Construction | 2016 |
| Lanes 4X4 Limited | Wholesale & retail | 2021 |
| Larstal Limited | Financial services | 2019 |
| Lasergenix Limited | Professional & scientific | 2025 |
| Latam HQ Health Ltd | Professional & scientific | 2015 |
| Latham Consultancy Limited | Financial services | 2014 |
| Laxandre Ltd | Health & social care | 2022 |
| Lazenby Trading & Holdings Limited | Professional & scientific | 2017 |
| LC Consulting Services Ltd | Administrative & support | 2024 |
| Lcjb Properties Limited | Real estate | 2022 |
| LE Chene Consultancy Ltd | Professional & scientific | 2017 |
| LEA Sports Limited | Manufacturing | 2020 |
| Leaders for Life Limited | Professional & scientific | 2013 |
| Leeryan Consultancy Ltd | Professional & scientific | 2007 |
| Left Foot Pass Ltd | Education | 2020 |
| Legallean Ltd | Real estate | 2022 |
| Leggero Forte Limited | Professional & scientific | 2013 |
| Leo-Loza Ltd | Hospitality | 2024 |
| Lesjay Ltd | Health & social care | 2022 |
| Level Build Construction Ltd | Construction | 2022 |
| Level Three Creative Limited | Administrative & support | 2004 |
| Lewensryk Ltd | Professional & scientific | 2016 |
| Lewis Advanced Digital Ltd | Information & communication | 2026 |
| Lewis Conservatoire Limited | Wholesale & retail | 2016 |
| Lewis House (Farnborough) RTM Company Ltd | Households | 2021 |
| Lewis Performing Arts LLP | | 2023 |
| LF Vascular Ltd | Health & social care | 2025 |
| LG & Sons Limited | Transport & logistics | 2023 |
| LGM Products Limited | Wholesale & retail | 1998 |
| Life Athletes Limited | Extraterritorial | 2015 |
| Lifeline Elder Care Limited | Health & social care | 2025 |
| Lifestyle Fitness Ltd | Other services | 2025 |
| Lift and Balance Limited | Arts & recreation | 2025 |
| Lightwell Ltd | Public administration | 2025 |
| Lime Jellyfish Ltd | Wholesale & retail | 2017 |
| Lindam Shipping Ltd | Wholesale & retail | 2025 |
| Lindens Limited(The) | Real estate | 1980 |
| Lindisfarne 2000 Limited | Hospitality | 1998 |
| Linkway Parade Limited | Real estate | 1985 |
| Linlong Ltd | Real estate | 2022 |
| Linstol MNH Limited | Professional & scientific | 2023 |
| Linstol Travel Limited | Professional & scientific | 2025 |
| Linstol UK Limited | Other services | 2002 |
| Liquorice Creative Ltd | Professional & scientific | 2005 |
| Lisa Balliache PR Limited | Administrative & support | 2009 |
| Lisa Macdonald Limited | Administrative & support | 2019 |
| Lisa Mcspadden Psychology Limited | Education | 2024 |
| Lite Work Designs Ltd | Manufacturing | 2023 |
| Litework Designs Group Ltd | Financial services | 2025 |
| Little Elves Community Pre-School Ltd | Education | 2012 |