| James Plastering Limited | Construction | 2013 |
| James Service UK Ltd | Construction | 2024 |
| JAY P Holdings Limited | Financial services | 2020 |
| Jayan Accountants Ltd | Professional & scientific | 2021 |
| Jaynik Group Limited | Financial services | 2017 |
| JD General Building Works Ltd | Construction | 2024 |
| JDM Building Solutions Limited | Construction | 2020 |
| JDS Investments & Holdings Ltd | Professional & scientific | 2023 |
| Jedmonds Automotive Services Limited | Professional & scientific | 2014 |
| Jemorton Ltd | Professional & scientific | 2014 |
| Jemsina Care Limited | Health & social care | 2018 |
| Jestech Limited | Information & communication | 2026 |
| JJ Publishing Ltd | Information & communication | 2025 |
| John a Hyde & Co Limited | Professional & scientific | 2013 |
| Johnsons 4 X 4 Limited | Wholesale & retail | 2011 |
| Jones & Sink Associates Limited | Wholesale & retail | 2010 |
| Jones Incorporated Ltd | Professional & scientific | 2024 |
| Jordanmedlink Ltd | Financial services | 2025 |
| Josand Trading Ltd | Wholesale & retail | 2025 |
| JPD Creative Consultancy Ltd | Professional & scientific | 2020 |
| JPW Autos Surrey Ltd | Wholesale & retail | 2023 |
| JRH Interiors Limited | Professional & scientific | 2007 |
| JTB Rail Limited | Construction | 2023 |
| Jules Gardens Ltd | Administrative & support | 2021 |
| Jules Property Limited | Real estate | 2021 |
| Juno Sourcing Limited | Wholesale & retail | 2017 |
| Just Awnings Limited | Construction | 2006 |
| Justice Wealth Management Ltd | Professional & scientific | 2021 |
| Jwas Limited | Information & communication | 2015 |
| K D Roofing Services Ltd | Construction | 2016 |
| K K Machine Hire Limited | Administrative & support | 1990 |
| K&M Desserts Ltd | Hospitality | 2021 |
| K-Mac Holdings Ltd | Real estate | 2023 |
| K.K. Water Purification Ltd. | Wholesale & retail | 1990 |
| KAD (Southeast) Ltd | Wholesale & retail | 2018 |
| Kamiss Barbers Ltd | Other services | 2024 |
| Kard Collectibles Limited | Wholesale & retail | 2026 |
| Karsons Properties Limited | Real estate | 2002 |
| Karuna Care Group Limited | Financial services | 2026 |
| Katie Jayne Tutors Ltd | Education | 2015 |
| Kazim Estates Ltd | Real estate | 2017 |
| KC Locksmiths & Security Limited | Extraterritorial | 2020 |
| Kcmn Consulting Ltd | Professional & scientific | 2026 |
| KD Cafe Restaurant Limited | Hospitality | 2024 |
| Keggo Ltd | Information & communication | 2026 |
| Keighley Lifts Limited | Construction | 1895 |
| Kekas Ltd | Hospitality | 2026 |
| Kharalis Ltd | Professional & scientific | 2015 |
| Kilmiston House Management Company Limited | Real estate | 1965 |
| Kilnwood Vale Management Company Limited | Households | 2013 |
| Kingfisher Business Advisors Ltd | Professional & scientific | 2011 |
| Kinu LUX Ltd | Other services | 2026 |
| Kira&Co Ltd | Wholesale & retail | 2025 |
| Kirklands Care Group Limited | Financial services | 2020 |
| Kirklands Care Limited | Health & social care | 2018 |
| Kirklands Healthcare Limited | Health & social care | 1995 |
| Kirsty's Aesthetic Touch Limited | Other services | 2024 |
| KIT for YOU Ltd | Wholesale & retail | 2025 |
| KK Balers Limited | Manufacturing | 1993 |
| Kmhr Ltd | Administrative & support | 2007 |
| KML Housing Limited | Real estate | 2022 |
| Knight & Sons Ltd | Construction | 2020 |
| Knights Groundworks and Construction Limited | Construction | 2018 |
| KOR3 Ltd | Professional & scientific | 2023 |
| Koyoma Ltd | Transport & logistics | 2020 |
| KRC Sobrinho Limited | Other services | 2016 |
| KRC Tax & Accountancy Ltd | Professional & scientific | 2023 |
| KSA Transport & Hire Ltd | Transport & logistics | 2023 |
| KT15 Hand Car Wash Ltd | Wholesale & retail | 2025 |
| KTV Spa Ltd | Other services | 2024 |
| Kumo.Io Limited | Information & communication | 2025 |
| Kwik Kall Ltd | Transport & logistics | 2025 |
| L Mach Heating Ltd | Construction | 2022 |
| L P M (Professional Recruitment) Limited | Administrative & support | 1980 |
| L. Hough Building & Roofing Services Limited | Construction | 2009 |
| L.R. Geotechnical Ltd | Professional & scientific | 2024 |
| LA Fontana Beauty Limited | Extraterritorial | 2022 |
| Labchem International Limited | Wholesale & retail | 2007 |
| Ladybird Propco Ltd | Real estate | 2017 |
| Lagoon Pools Holdings Ltd | Financial services | 2017 |
| Lakshmi Sadan Estate Holdings Ltd | Real estate | 2015 |
| Landscape Estates Limited | Administrative & support | 2001 |
| Laros Move Group Limited | Transport & logistics | 2024 |
| Laser Consultants Ltd | Professional & scientific | 2021 |
| Lawnscience North Surrey Limited | Administrative & support | 2019 |
| Laxmi Living Ltd | Real estate | 2019 |
| LCM Stoica Ltd | Wholesale & retail | 2023 |
| LCP Nexus Ltd | Professional & scientific | 2025 |
| LDB Wakeschool Limited | Administrative & support | 2017 |
| LDO Consultants Ltd | Professional & scientific | 2025 |
| LE OPS Consulting Ltd | Information & communication | 2024 |
| Lean Process Partners Ltd | Professional & scientific | 2019 |
| Learning United Limited | Education | 2017 |
| Learnmore Network Limited | Professional & scientific | 2011 |
| Learnmore Skills Ltd | Education | 1986 |
| LEE Woods Transport Services Limited | Transport & logistics | 2002 |
| Lernitude Ltd | Education | 2025 |
| Lewis Accountancy Services Limited | Professional & scientific | 2024 |
| Lexa Lettings Limited | Real estate | 2023 |
| Lexa Services Limited | Professional & scientific | 2017 |