| Kamtec Models Limited | Manufacturing | 2012 |
| Kanarya Bognor Limited | Hospitality | 2025 |
| Kane Mechanical Services Limited | Manufacturing | 2018 |
| Kane the Barber Ltd | Other services | 2025 |
| KAP Electrical South Ltd | Construction | 2023 |
| Karacx Consulting Ltd | Professional & scientific | 2024 |
| Karen Mccoll Consulting Ltd | Professional & scientific | 2020 |
| Kataria & Sons Limited | Wholesale & retail | 2016 |
| Katseye Blends Ltd | Wholesale & retail | 2022 |
| Kaus Limited | Wholesale & retail | 2025 |
| KB Training & Development Ltd | Other services | 2016 |
| Kc&L Limited | Administrative & support | 2017 |
| Kcgl Builders Ltd | Construction | 2020 |
| KD Enterprise Trades Ltd | Wholesale & retail | 2017 |
| KD Properties Enterprise Ltd | Real estate | 2022 |
| Keane Plumbing & Heating Limited | Construction | 2016 |
| Kedek Limited | Professional & scientific | 1972 |
| Keith Mcnally Trading Ltd | Professional & scientific | 2025 |
| Keles 2025 Limited | Hospitality | 2025 |
| Kellyways Ltd | Transport & logistics | 2022 |
| Kennedy Automotive Limited | Wholesale & retail | 2026 |
| Kent Toilet Hire Limited | Administrative & support | 2021 |
| Kents Yard Management Company Limited | Real estate | 2024 |
| Kepler Technologies Ltd | Information & communication | 2022 |
| Kerfim Solutions Ltd | Wholesale & retail | 2019 |
| Kerwood Management Ltd | Households | 2021 |
| Keshav MSM Limited | Wholesale & retail | 2021 |
| Kesingbourne Consultancy Ltd | Professional & scientific | 2019 |
| Kevin Enwereji Ltd | Professional & scientific | 2025 |
| Kevin Peskett Carpentry and Joinery LLP | | 2011 |
| Kevin Stedman Education Consultant Ltd | Professional & scientific | 2011 |
| Keymer Landscapes Limited | Administrative & support | 2002 |
| KHA01 Ltd | Construction | 2026 |
| Kids GET Busy Limited | Extraterritorial | 2007 |
| Kimball Stunts Limited | Arts & recreation | 2025 |
| Kinetic-Id Ltd | Manufacturing | 2018 |
| Kingley Consulting Limited | Administrative & support | 2016 |
| Kingley Investments Ltd | Real estate | 1994 |
| Kingston Contractors Sussex Limited | Construction | 2020 |
| Kinsellas's Ltd | Hospitality | 2026 |
| Kinship & Kind Ltd | Households | 2026 |
| Kiss ME Quick Limited | Health & social care | 2025 |
| Kitchen Design 4 YOU Limited | Wholesale & retail | 2024 |
| Kitchen Facelift & Renewal Limited | Wholesale & retail | 2002 |
| KJL Solutions Limited | Information & communication | 2010 |
| KLC Ventures (Property) Ltd | Real estate | 2024 |
| KLC Ventures Ltd | Professional & scientific | 2022 |
| KLK Restaurant Ltd | Hospitality | 2025 |
| Knight Gate Consultancy Ltd | Professional & scientific | 2023 |
| Knight Strategic Consultants Ltd | Administrative & support | 2023 |
| Knightc Composites Ltd | Manufacturing | 2024 |
| KO Food Limited | Wholesale & retail | 2023 |
| Koru Design Limited | Professional & scientific | 2003 |
| Koye 2009 Limited | Wholesale & retail | 2022 |
| KRASI78 Ltd | Other services | 2015 |
| Kronos Finishes Ltd | Administrative & support | 2017 |
| KRS Real Estate Management Ltd | Real estate | 2025 |
| Kruger Brent Training Limited | Construction | 2014 |
| Kulig Engineering Ltd | Other services | 2019 |
| Kuzet Group Ltd | Construction | 2025 |
| Kvpc Limited | Professional & scientific | 2016 |
| KWA Property Ltd | Real estate | 2022 |
| Kyodo Consulting Ltd | Information & communication | 2007 |
| L a Works Ltd | Construction | 2023 |
| L and M Mains and Moling Limited | Water & waste | 2024 |
| L Ashcroft Brickwork Ltd | Construction | 2018 |
| L E Plumbing and Heating Limited | Construction | 2017 |
| L. Fritz Technology (UK) Limited | Professional & scientific | 1995 |
| L.A.Dawkins Construction Ltd | Construction | 2020 |
| L.M Builds Ltd | Construction | 2023 |
| L.N.B. Limited | Professional & scientific | 1993 |
| LA Carpentry & Building Ltd | Construction | 2018 |
| LA Mode Group CIC | Wholesale & retail | 2024 |
| LA Saucy Salsa Ltd | Hospitality | 2015 |
| LA Vida Tapas Ltd | Hospitality | 2025 |
| Labfacility Group Limited | Manufacturing | 2002 |
| Labfacility Limited | Manufacturing | 1971 |
| Lacode Ltd | Information & communication | 2024 |
| Lambda Aerospace Limited | Manufacturing | 2019 |
| Lambda Construction and Refurbishment Limited | Construction | 2014 |
| Lancaster Construction Limited | Construction | 2021 |
| Langley SUB Limited | Hospitality | 2010 |
| Langridge Scaffolding Limited | Administrative & support | 2011 |
| Lapthorne Limited | Professional & scientific | 2016 |
| Latfood Ltd | Wholesale & retail | 2020 |
| Latham Grove (Ashington) Residents Management Company Ltd | Households | 2025 |
| LAU Construction South Ltd | Construction | 2023 |
| Lauren Amara Ltd | Other services | 2026 |
| Lauren Gardens Management Company Limited | Extraterritorial | 2012 |
| Laurentiu & Lovin Construction Ltd | Construction | 2017 |
| Lavant Cricket Club Limited | Arts & recreation | 2024 |
| LB Home and Garden Services Ltd | Administrative & support | 2024 |
| LC Printworks Ltd | Manufacturing | 2022 |
| LDK Consulting Limited | Professional & scientific | 2025 |
| Learn With LEE Limited | Education | 2007 |
| Leaseholdings Ltd | Hospitality | 2009 |
| LEE & Sons Property Ltd | Households | 2025 |
| Legacy Property Development (Hampshire) Limited | Real estate | 2026 |
| LEGACY1931 Limited | Real estate | 2026 |
| Legends Custom Shop Ltd | Wholesale & retail | 2022 |