| Kimberley Hill Photography Limited | Professional & scientific | 2018 |
| Kindle Investments Limited | Real estate | 2025 |
| Kings Mount Ltd | Real estate | 2023 |
| Kiniki Holdings Limited | Financial services | 2010 |
| Kiniki Limited | Professional & scientific | 1992 |
| Kinnersley 1 Limited | Construction | 2025 |
| Kirkhallam Limited | Hospitality | 2019 |
| Kirkley Solutions Ltd | Professional & scientific | 2017 |
| KIT Milligans Ltd | Other services | 2025 |
| Kitty Hawk Consultants Limited | Information & communication | 2005 |
| KJ Stoke Property Services Ltd | Real estate | 2025 |
| Kjonjones Ltd | Health & social care | 2026 |
| KK4 Solutions Limited | Administrative & support | 2021 |
| KLP Property Limited | Real estate | 2023 |
| KLS Business Solutions Ltd | Professional & scientific | 2017 |
| KMF Group Holdings Limited | Financial services | 2018 |
| KMF Manufacturing Group Limited | Financial services | 2025 |
| KML Cleaning Ltd | Administrative & support | 2024 |
| Knightsgate Limited | Financial services | 2025 |
| Know Your Compliance Limited | Information & communication | 2018 |
| Knowles & Associates Limited | Professional & scientific | 2023 |
| Knox Installations Ltd | Construction | 2013 |
| Knox OIL & GAS Ltd | Manufacturing | 2016 |
| Koko Digital Limited | Professional & scientific | 2007 |
| KOL Capital Limited | Real estate | 2024 |
| Kommand Travel Ltd | Administrative & support | 2023 |
| KON Services (N.I) Ltd | Construction | 2025 |
| Koodalloor Ltd | Health & social care | 2014 |
| Kord Holdings Ltd | Real estate | 2022 |
| Kose Health Limited | Health & social care | 2020 |
| Kose Kebab 1 Ltd | Hospitality | 2024 |
| KP & SC Investments Limited | Real estate | 2019 |
| KP & VR Limited | Wholesale & retail | 2025 |
| KP Assets Limited | Real estate | 2018 |
| Kpas Galgate Ltd | Hospitality | 2018 |
| Kpmr Ltd. | Construction | 2010 |
| KPS Property Ventures Ltd | Real estate | 2026 |
| KPV Investments Ltd | Real estate | 2020 |
| KPV Propco Ltd | Real estate | 2014 |
| KR Annett Handling Solutions Ltd | Construction | 2015 |
| Kratos Finance Limited | Financial services | 2024 |
| KRC Ecological Ltd | Professional & scientific | 2018 |
| Krispers Limited | Hospitality | 2019 |
| Kronos Consultants Limited | Other services | 2019 |
| KRP Cooling Solutions Ltd | Construction | 2021 |
| KRP Property Ltd | Real estate | 2025 |
| Krupasanam Property Management Limited | Real estate | 2025 |
| KS Distributionsc Ltd | Wholesale & retail | 2026 |
| KS Investments (SOT) Ltd | Real estate | 2021 |
| KSA Trader Ltd | Professional & scientific | 2022 |
| KSC Property Developments Ltd | Construction | 2018 |
| KTC & K-9 Security Services Ltd. | Administrative & support | 2023 |
| KTS Homecare Ltd | Health & social care | 2025 |
| Kudamangal Limited | Health & social care | 2017 |
| Kukha UK Ltd | Health & social care | 2024 |
| Kunuku Solutions Ltd | Information & communication | 2025 |
| L & R North East Limited | Hospitality | 2017 |
| L Brennan Property Ltd | Real estate | 2025 |
| L G Tiling Ltd | Construction | 2018 |
| L&D Insulation Services Limited | Construction | 2009 |
| L&S UK Assets Limited | Real estate | 2024 |
| L&T Healthcare Ltd | Health & social care | 2019 |
| L.R. Data Active Services Ltd | Information & communication | 2026 |
| L26 Building Maintenance Ltd | Construction | 2025 |
| LA Holdings (Staffs) Limited | Real estate | 2021 |
| LA Maison Bleue (NE) Ltd | Real estate | 2025 |
| LA Tuning Ltd | Wholesale & retail | 2026 |
| Labourlist Limited | Information & communication | 2009 |
| Lady MAY Aesthetics Limited | Health & social care | 2016 |
| Laighean MEP Installations Ltd | Construction | 2025 |
| Lambda Engineering Ltd | Professional & scientific | 2017 |
| LAN Enterprises Ltd | Hospitality | 2020 |
| Lancashire Oak Ltd. | Construction | 2017 |
| Lancaster Environmental Limited | Construction | 2021 |
| Landscaping Solutions North East Ltd | Wholesale & retail | 2022 |
| Langdale Investment Company Limited | Real estate | 2020 |
| Langley Alloys Holdings Limited | Professional & scientific | 2008 |
| Langley Alloys Limited | Wholesale & retail | 1995 |
| Langley Offshore Limited | Construction | 2022 |
| Language Assessment Ltd | Education | 2023 |
| Lanwoods Consultancy & Services Limited | Administrative & support | 2022 |
| Laser Quest (Bromley) Limited | Arts & recreation | 2021 |
| Laser Quest (Romford) Limited | Arts & recreation | 2022 |
| Latham Filtration EOT Trustee Limited | Financial services | 2024 |
| Latham Filtration Limited | Financial services | 2013 |
| Latham Upholstery Limited | Other services | 2004 |
| Laureen's Kids Clothing Ltd | Wholesale & retail | 2024 |
| Lawcalc Limited | Information & communication | 2017 |
| Lawn Mower Parts Distributors Limited | Wholesale & retail | 2025 |
| Lawns in Order Limited | Administrative & support | 2013 |
| Lawtons Autos Ltd | Wholesale & retail | 2016 |
| Laxmi (Staffordshire) Limited | Health & social care | 2014 |
| Lazcon Ltd | Wholesale & retail | 2019 |
| Lazy BJ Ranch Limited | Hospitality | 2018 |
| LB Yachts Limited | Wholesale & retail | 2025 |
| LBP Haulage Services Ltd | Construction | 2008 |
| LCS Private Ltd | Health & social care | 2023 |
| LCW Joinery Ltd | Construction | 2025 |
| Lead Machine Marketing Ltd | Professional & scientific | 2020 |
| League of Trades Ltd | Professional & scientific | 2024 |