| KR Clothing Ltd | Wholesale & retail | 2026 |
| Krash Tech Limited | Information & communication | 2017 |
| KRC Motors & SON Limited | Wholesale & retail | 2013 |
| Krgt Consulting Limited | Transport & logistics | 2020 |
| Kritya Pharma Ltd | Wholesale & retail | 2024 |
| KS and KS Limited | Construction | 2006 |
| KS Cleaning Solutions Ltd | Administrative & support | 2017 |
| KSS Collective Ltd | Other services | 2026 |
| KTS Retail Ltd | Wholesale & retail | 2022 |
| Kurt Singleton Limited | Construction | 2020 |
| Kuzi Design Ltd | Wholesale & retail | 2019 |
| Kvob Holdings Limited | Financial services | 2025 |
| Kwikstairs Limited | Manufacturing | 2012 |
| Kwikstairs USA Ltd | Manufacturing | 2017 |
| Kyle Homes Ltd | Real estate | 2021 |
| Kyra Developments Ltd | Real estate | 2026 |
| Kytes Motor Repairs Limited | Wholesale & retail | 2025 |
| L Damsell Plumbing & Heating Ltd | Construction | 2017 |
| L for Leather Saddlers Limited | Manufacturing | 2019 |
| L Mathu Ltd | Wholesale & retail | 2023 |
| L Porter Ltd | Professional & scientific | 2014 |
| L V K Resin Flooring Ltd | Construction | 2024 |
| L&L Construction (Wiltshire) Ltd | Construction | 2020 |
| L.F. Replacement Windows Limited | Construction | 1986 |
| L.J Motorworks Ltd | Wholesale & retail | 2026 |
| L.Payne Developments Ltd | Construction | 2021 |
| L2B Aviation Limited | Other services | 2000 |
| L3 Properties Ltd | Real estate | 2020 |
| LA Brisa Foods Ltd | Hospitality | 2025 |
| Lacock Emporium Limited | Manufacturing | 2025 |
| Laddenbrook Car Sales Limited | Wholesale & retail | 2018 |
| Ladder Booties Ltd | Manufacturing | 2022 |
| Ladies Golf Tour Limited | Professional & scientific | 2022 |
| Lady and a Brush Ltd | Construction | 2026 |
| LAG Utilities Ltd | Construction | 2026 |
| Lagard Properties Limited | Real estate | 2025 |
| Lajami LAB Ltd | Financial services | 2022 |
| Lalo Homes and Construction Ltd | Construction | 2026 |
| Lamb Brewery Limited | Hospitality | 2012 |
| Land Agriculture Limited | Other services | 2020 |
| Land and Property Planning Solutions Limited | Professional & scientific | 2006 |
| Land Development & Planning Consultants Limited | Construction | 2001 |
| Langford Rose Ltd | Professional & scientific | 2022 |
| Lansdown Grove Freehold Limited | Households | 2018 |
| Lansdowne Estate Services Ltd | Real estate | 2009 |
| Lara Restaurant Ltd | Hospitality | 2025 |
| Larkspur Dell Ltd | Financial services | 2021 |
| Launch 2 Learning Ltd | Education | 2016 |
| Laurel Lets Limited | Hospitality | 2024 |
| Laurence Cable Writing and Editing Limited | Information & communication | 2015 |
| Lavish Lights Ltd | Wholesale & retail | 2024 |
| Lawley House Management Limited | Real estate | 1985 |
| Layzell Property (1995) Limited | Construction | 1995 |
| LBS Consultancy Limited | Professional & scientific | 2004 |
| LBX Group Ltd | Transport & logistics | 2026 |
| LCS Healthcare Ltd | Professional & scientific | 2011 |
| LDS Consulting Limited | Information & communication | 2025 |
| LE Bechee Bruce Limited | Real estate | 1991 |
| LE DUC Systems Ltd | Professional & scientific | 2021 |
| LE Motor Squad Ltd | Administrative & support | 2018 |
| Leadline Services Limited | Administrative & support | 1996 |
| Leafield Logistics & Technical Services Limited | Manufacturing | 2008 |
| Leafield Ltd | Manufacturing | 2018 |
| Leaflets 2 Leads Ltd | Transport & logistics | 2021 |
| Leafy Lane Playing Fields Ltd. | Arts & recreation | 1996 |
| Leafy Outlook Limited | Arts & recreation | 2020 |
| Learncast Limited | Wholesale & retail | 2026 |
| Lebre Properties (Two) Limited | Real estate | 2023 |
| Lee's Auto-Group Ltd | Wholesale & retail | 2016 |
| Leggy Legs Ltd | Wholesale & retail | 2021 |
| Leisure Building Services Ltd | Wholesale & retail | 2016 |
| Leisurely Ltd | Wholesale & retail | 2020 |
| Lemasonry Holdings Limited | Financial services | 2023 |
| Lemon Cleaning (South) Ltd | Administrative & support | 2019 |
| Leonardos Engineering Consultancy Ltd | Professional & scientific | 2023 |
| Leslie, Ward & Drew Ltd | Professional & scientific | 2014 |
| Lets GET LIT Entertainment Ltd | Hospitality | 2025 |
| Letzclear Limited | Administrative & support | 2024 |
| Levreu Stays Ltd | Real estate | 2026 |
| Lewnah Ltd | Information & communication | 2016 |
| LEY Farm Developments Ltd | Construction | 2025 |
| LF Lets Ltd | Real estate | 2019 |
| LFL Woodworking Ltd | Construction | 2016 |
| LG Management & Advisory Ltd | Professional & scientific | 2026 |
| LGD Properties Limited | Real estate | 2023 |
| Liam Turner Design Ltd | Professional & scientific | 2022 |
| Licata Properties Limited | Real estate | 2023 |
| Lickimat UK Ltd | Manufacturing | 2023 |
| Liddiard Property Holdings Ltd | Real estate | 2022 |
| Life Lens Ltd | Information & communication | 2025 |
| Life Space Solutions Ltd | Professional & scientific | 2002 |
| Lightbar UK Limited | Wholesale & retail | 2017 |
| Lighterman Projects Limited | Construction | 2021 |
| Lights for Learning | Education | 2004 |
| Lignum Barks Limited | Construction | 2019 |
| LIH Properties Ltd | Real estate | 2025 |
| Lildec Ltd | Construction | 2014 |
| Lili Property Management Limited | Real estate | 2023 |
| Lillybrook House Stud LLP | | 2019 |
| Lilydore Ltd | Financial services | 2016 |