| Kingsholme Court Maintenance Limited | Households | 1971 |
| Kingsland Court Management Company Limited | Households | 2001 |
| Kingswood Trade Frames Limited | Construction | 2021 |
| Kinverdale Court Management Company Limited | Households | 1989 |
| Kipsh Trans Global Ltd | Transport & logistics | 2016 |
| Kirkuk Travel Limited | Transport & logistics | 2024 |
| Kirsten Hemingway Ltd | Extraterritorial | 2020 |
| Kirumi Limited | Hospitality | 2025 |
| Kiss This Company Limited | Arts & recreation | 2010 |
| KJ Garden Machinery Limited | Other services | 2025 |
| Klass Ltd | Other services | 2021 |
| Klosed Ltd | Professional & scientific | 2026 |
| KM Coastal Limited | Health & social care | 2024 |
| KMB Logistics Ltd | Transport & logistics | 2022 |
| Kmiecik Limited | Transport & logistics | 2026 |
| KMT Fire & Security Ltd | Professional & scientific | 2023 |
| Knightlow WSM Residents Ltd | Households | 2023 |
| Knightsbridge Auction House Ltd | Wholesale & retail | 2022 |
| Knightstone Electrical Ltd | Construction | 2025 |
| Knightstone Island Limited | Households | 2009 |
| Knightstone Property Development Ltd | Construction | 2019 |
| Knightstone Residential Ltd | Real estate | 2021 |
| Knight’S Cafe Limited | Hospitality | 2022 |
| Knowledge Republic Limited | Extraterritorial | 2012 |
| Kobuk Limited | Construction | 2018 |
| Kolins Synergy Global Investment Limited | Wholesale & retail | 2022 |
| Komandoss Ltd | Transport & logistics | 2025 |
| Kooibiza Ltd | Administrative & support | 2019 |
| Koolvent TEK Ltd | Construction | 2019 |
| Korca Solutions Ltd | Professional & scientific | 2025 |
| KOS Cuts Limited | Other services | 2026 |
| Kounnou Financial Services Ltd | Financial services | 2014 |
| Kovdev Ltd | Information & communication | 2025 |
| KP Marketing Ltd | Arts & recreation | 2024 |
| KR Electrical (SW) Ltd | Construction | 2023 |
| KS Commercial Cleaners Ltd | Administrative & support | 2025 |
| KS Weston Ltd | Wholesale & retail | 2015 |
| KSI Cleaning Limited | Administrative & support | 2026 |
| KTI Investments Ltd | Real estate | 2025 |
| Kulsiri Araya Limited | Hospitality | 2025 |
| Kumeso Ltd | Health & social care | 2023 |
| Kurd & Barbers Ltd | Other services | 2025 |
| Kurd Star Barber 1 Ltd | Other services | 2026 |
| Kurdish CUT Ltd | Other services | 2026 |
| Kustom Installations Ltd | Information & communication | 2020 |
| Kwld Bricklaying Ltd | Construction | 2023 |
| KWP Financial Planning Limited | Financial services | 2014 |
| Kyati Limited | Wholesale & retail | 2017 |
| Kyle Watts Construction Company Ltd | Construction | 2025 |
| Kyosei Engagement Ltd | Information & communication | 2025 |
| L & P.O.Properties Ltd | Real estate | 2025 |
| L a Design & Build Limited | Construction | 2023 |
| L D Walsh Plastering Contractors Ltd | Construction | 2009 |
| L R Bricklaying Contractors Ltd | Construction | 2016 |
| L S T Electrical Ltd | Administrative & support | 2016 |
| L Squared Consulting Ltd | Professional & scientific | 2022 |
| L&Dp Properties Limited | Real estate | 2025 |
| L.M. Holmes Ltd | Construction | 2018 |
| LA Nuova Musica | Arts & recreation | 2010 |
| Labogene UK Ltd | Professional & scientific | 2009 |
| Lake View, Laurel Homes, Management Company Ltd | Construction | 2024 |
| Lakeside Cars South West Ltd | Wholesale & retail | 2024 |
| Lala Kias Ltd | Health & social care | 2018 |
| Lamabo Ltd | Health & social care | 2018 |
| Lamadrid Limited | Education | 2017 |
| Lancaster Brooks Property Management Limited | Real estate | 2022 |
| Land & Prosper Limited | Real estate | 2025 |
| Landbased Services Ltd | Agriculture & fishing | 2021 |
| Landscore Mansions Limited | Households | 2024 |
| Lanesra Estates Limited | Real estate | 2024 |
| Langcourt Holdings Limited | Professional & scientific | 2012 |
| Langcourt Limited | Manufacturing | 1984 |
| Langcourt Properties Limited | Real estate | 2012 |
| Langdon Lifts Ltd | Manufacturing | 2022 |
| Langport 2005 RTM Company Limited | Households | 2005 |
| Langport Transport Limited | Transport & logistics | 2017 |
| Lannings Trees & Fences Limited | Administrative & support | 2023 |
| Lansdown Court (Weston Super Mare) Limited | Households | 1974 |
| Lansdown Gardens (Worle) Residents Company Limited | Households | 1987 |
| Lanyard Court Management Company Limited | Households | 2002 |
| Laporte Developments Limited | Education | 2022 |
| Larimar Entertainments Limited | Arts & recreation | 2023 |
| Lasam Group Limited | Wholesale & retail | 2017 |
| Lasam Limited | Wholesale & retail | 2010 |
| Latrussi Limited | Manufacturing | 2023 |
| Lauf Transport Ltd | Transport & logistics | 2015 |
| Laurel Homes SW Ltd | Construction | 2024 |
| Laurel House Winscombe Management Company Limited | Households | 1999 |
| Lauri Beckett Ltd | Information & communication | 2026 |
| Laver Financial Limited | Financial services | 2017 |
| Laver Wealth Limited | Financial services | 2017 |
| Lawders Orchard Limited | Extraterritorial | 2015 |
| Lawders Orchard Management Limited | Real estate | 2018 |
| Laxia Lettings Limited | Real estate | 2019 |
| Lazy Acres Ltd | Wholesale & retail | 2008 |
| LB Plastering Services Ltd | Construction | 2019 |
| LBK Supplies Ltd | Wholesale & retail | 2023 |
| LBS Training & Assessing Ltd | Education | 2024 |
| LDD Cellar GAS Ltd | Hospitality | 2021 |
| Learn Projects Ltd | Professional & scientific | 2016 |