| KP Engineering Services Ltd | Professional & scientific | 2015 |
| KP LUX Living Ltd | Real estate | 2026 |
| KPM Consulting Service Limited | Mining & quarrying | 2015 |
| KPM Events Limited | Professional & scientific | 2017 |
| KR Decorators Ltd | Construction | 2011 |
| Krab Shells Limited | Real estate | 2017 |
| Kreas Property Management Limited | Professional & scientific | 2025 |
| Kredo IT Limited | Information & communication | 2007 |
| KS Connexions Limited | Construction | 2017 |
| KSB Healthcare Limited | Health & social care | 2021 |
| KSD Enterprise Ltd | Financial services | 2018 |
| KSM Groundworks Limited | Construction | 2016 |
| Kt-As Properties Ltd | Real estate | 2025 |
| KTF CAD Software Limited | Information & communication | 2019 |
| Ktmx Limited | Real estate | 2021 |
| Kuamka Ltd | Information & communication | 2012 |
| Kuching Putih Limited | Real estate | 2021 |
| Kuma Property Management Limited | Real estate | 2012 |
| Kumari Holdings Limited | Professional & scientific | 2026 |
| Kumari Investments Limited | Real estate | 2026 |
| Kundan Bride Limited | Extraterritorial | 2017 |
| Kuredo Group Ltd | Wholesale & retail | 2020 |
| Kush Services Limited | Administrative & support | 2021 |
| KW Law LLP | | 2009 |
| Kwalee Labs Ltd | Information & communication | 2025 |
| Kwalee Ltd | Information & communication | 2011 |
| Kwinsper Consultancy Limited | Professional & scientific | 2013 |
| KY Cleaning Services Ltd | Other services | 2026 |
| KYE Holdings Limited | Professional & scientific | 2021 |
| L & B UPS Limited | Energy | 2007 |
| L & M Automotive Limited | Wholesale & retail | 2025 |
| L & W Engineering Solutions Ltd | Extraterritorial | 2019 |
| L Dunn Reports Ltd | Real estate | 2012 |
| L H Engineering Limited | Construction | 2014 |
| L Higham Butchers Ltd | Wholesale & retail | 2019 |
| L P Machinery Limited | Professional & scientific | 2019 |
| L3B Immobilier Ltd | Construction | 2015 |
| L5 Executive Services Ltd | Professional & scientific | 2014 |
| LA Barbera Barbers Limited | Wholesale & retail | 2026 |
| LAB Awesome Limited | Education | 2017 |
| Lacivert Ltd | Professional & scientific | 2019 |
| Ladc Limited | Construction | 2020 |
| Lagoona Sands Limited | Wholesale & retail | 2024 |
| LAJ Health Ltd | Health & social care | 2023 |
| Lakeside Capital Investments Holdings Limited | Real estate | 2023 |
| LAL and Sons Limited | Wholesale & retail | 2005 |
| Lamaa Food Holdings Ltd | Hospitality | 2024 |
| Lamats Limited | Wholesale & retail | 2005 |
| Lambent Industries Limited | Wholesale & retail | 2008 |
| Lambs END Ltd | Agriculture & fishing | 2014 |
| Lamotte Europe Limited | Wholesale & retail | 2013 |
| Lamotte UK Limited | Wholesale & retail | 2023 |
| LAN33 Ltd | Transport & logistics | 2020 |
| Lancaster House Property Company Ltd | Real estate | 2014 |
| Lancea Konsult UK Limited | Information & communication | 2026 |
| Land Partnership Developments (Norton) Limited | Professional & scientific | 2024 |
| Landlordsrescue.Com Limited | Information & communication | 2022 |
| Langford Drainage Solutions Ltd | Construction | 2023 |
| Language Business Breakthrough Ltd | Administrative & support | 2024 |
| Lansdowne Laundry Ltd | Other services | 2022 |
| Lansdowne Law Limited | Professional & scientific | 2014 |
| Lapworth Asset Management Limited | Professional & scientific | 2008 |
| Laram Tech Limited | Information & communication | 2026 |
| Larch Consulting Limited | Professional & scientific | 1995 |
| Lark Design Studio Ltd | Professional & scientific | 2017 |
| Larkstoke Advisors Limited Liability Partnership | | 2018 |
| Larkstoke Corporate Services Ltd | Administrative & support | 2024 |
| Larkstoke Services Ltd | Administrative & support | 2018 |
| Laroma (Newry) Ltd | Real estate | 2013 |
| Lasagesse Consulting Limited | Professional & scientific | 2025 |
| Lasalign Limited | Wholesale & retail | 1985 |
| Laser Safety Advisory Limited | Professional & scientific | 2012 |
| Lashxl Ltd | Other services | 2025 |
| Lasting Impressions Communications Limited | Professional & scientific | 2011 |
| Latner Properties Limited | Professional & scientific | 2006 |
| Launch Matrix Ltd | Information & communication | 2022 |
| Launch Systems Ltd | Information & communication | 1996 |
| Lavata Group Limited | Professional & scientific | 2017 |
| Lawful London Limited | Wholesale & retail | 2019 |
| Lawler Squared Ltd | Information & communication | 2023 |
| Lawriehr Ltd | Administrative & support | 2022 |
| Laxpol Limited | Professional & scientific | 2014 |
| Layopay Limited | Information & communication | 2022 |
| Laystall Land Ltd | Real estate | 2015 |
| LC Equestrian Limited | Wholesale & retail | 2020 |
| LC Green Limited | Hospitality | 2025 |
| LC Ground and Property Services Ltd | Construction | 2026 |
| LCK Management Limited | Professional & scientific | 2021 |
| LD Plastering (Leamington) Ltd | Construction | 2017 |
| LDW Project Consulting Limited | Professional & scientific | 2023 |
| LE Buns Ltd | Hospitality | 2025 |
| LE Dent Limited | Health & social care | 2024 |
| LE Fioria Ltd | Hospitality | 2024 |
| LE Keux Cosmetics Ltd | Wholesale & retail | 2020 |
| LE Keux Franchises Limited | Professional & scientific | 2017 |
| LE Keux Vintage Enterprises Limited | Wholesale & retail | 2012 |
| LEA Building Consultants Limited | Construction | 2014 |
| Leaderize Ltd | Education | 2021 |
| Leading Edge Coaching Limited | Professional & scientific | 2007 |
| Leading Solutions Limited | Professional & scientific | 2000 |