| Jollypub Taverns Ltd | Hospitality | 2020 |
| JON Shan Consulting Ltd | Professional & scientific | 2025 |
| Joom Accounting Ltd | Professional & scientific | 2009 |
| Josie's Place Ltd | Wholesale & retail | 2022 |
| JP Broadway Ltd | Real estate | 2023 |
| JRS Contracts Limited | Agriculture & fishing | 2002 |
| Jsba Holdings Ltd | Hospitality | 2016 |
| JT Energy Services Ltd | Professional & scientific | 2019 |
| JTR Couriers Limited | Transport & logistics | 2023 |
| Jupra Group Limited | Administrative & support | 2026 |
| Jupra Services Limited | Professional & scientific | 2025 |
| Jupra Ventures Limited | Administrative & support | 2026 |
| JWR Landscape Gardening Limited | Administrative & support | 2025 |
| K Carpentry & Construction Ltd | Construction | 2023 |
| K Graphics Limited | Administrative & support | 2009 |
| K.P.A Tennis Services Ltd | Professional & scientific | 2018 |
| KAN Agency Limited | Information & communication | 2020 |
| Karsan Automotive Ltd | Manufacturing | 2026 |
| Kate Boats Warwick Limited | Manufacturing | 1997 |
| Kaverlynx Ltd | Administrative & support | 2026 |
| KCT Building Services Limited | Construction | 2019 |
| KCT Lettings SPV Ltd | Real estate | 2025 |
| KDS Plant Limited | Manufacturing | 2016 |
| Kearns Browne Services Limited | Construction | 2021 |
| Keelan Robinson Consulting Limited | Professional & scientific | 2018 |
| Kencraft Design Limited | Professional & scientific | 2007 |
| Keshav Housing Limited | Real estate | 2018 |
| Key Ostas Limited | Other services | 2007 |
| Keyte Construction Ltd | Construction | 2025 |
| KIM George Financial Planning Ltd. | Financial services | 2017 |
| Kingmaker Developments Limited | Real estate | 2013 |
| Kirby Space Limited | Real estate | 2024 |
| Kitchen Vent Technical Ltd | Professional & scientific | 2019 |
| Kitova Ltd | Professional & scientific | 2025 |
| KJF Audio Ltd. | Manufacturing | 2015 |
| Kmars Limited | Financial services | 2015 |
| Koopid Ltd | Wholesale & retail | 2019 |
| KR11 Limited | Other services | 2018 |
| Kuninski Design Ltd | Professional & scientific | 2019 |
| Ladbroke Hall Management Limited | Households | 1972 |
| Land Designs (Midlands) Ltd | Construction | 2022 |
| Landmark Property Works Limited | Construction | 2022 |
| Laneon Limited | Financial services | 2013 |
| Lasmit TLB Limited | Information & communication | 2013 |
| Laurencekirk Land Limited | Construction | 2016 |
| Lawford Developments Limited | Real estate | 1996 |
| Laya Studio Ltd | Other services | 2023 |
| LE Sankey Arts Limited | Arts & recreation | 2022 |
| Leamington Network Collective Limited | Administrative & support | 2025 |
| Leamington Roofing and Building Ltd | Construction | 2025 |
| Lean and Safe Consulting Ltd | Professional & scientific | 2020 |
| Learn Ecology Ltd | Professional & scientific | 2022 |
| Lelex Carpets Ltd | Wholesale & retail | 2015 |
| Lelloliving Ltd | Wholesale & retail | 2020 |
| Leopard Engineering Limited | Professional & scientific | 1993 |
| Leos Strings Ltd | Arts & recreation | 2019 |
| Lerrin Ltd | Professional & scientific | 2016 |
| Lewis Dodds Limited | Construction | 2021 |
| LGJ Carpentry Limited | Manufacturing | 2026 |
| Light Centre Clapham Ltd | Health & social care | 2021 |
| Light Centre Kings Cross Limited | Health & social care | 2024 |
| Light Centre Marylebone Limited | Health & social care | 2020 |
| Light Centre Monument Limited | Health & social care | 2016 |
| Lime & Co Developments Ltd | Real estate | 2020 |
| Lime Consultancy Services Ltd | Professional & scientific | 2018 |
| Lime Street Holdings (London) Ltd | Real estate | 2017 |
| Limecroft Property Solutions Limited | Real estate | 2026 |
| Lindsey Woodfield T/A Seasons Art Class Stratford Upon Avon and Southam Limited | Education | 2020 |
| Little Bards Limited | Education | 2023 |
| Live Your Vision Ltd | Professional & scientific | 2013 |
| Livecofriendly Ltd | Wholesale & retail | 2020 |
| Llpa Property Ltd | Real estate | 2019 |
| Locomotive Parts Limited | Wholesale & retail | 2022 |
| Longitchington Diner Ltd | Hospitality | 2024 |
| Loreca Ltd | Professional & scientific | 2021 |
| Lotus Logistics Limited | Professional & scientific | 1993 |
| Loveballet Dance Company Limited | Education | 2013 |
| LT Property Care Ltd | Construction | 2026 |
| Lucy SUD Associates Limited | Other services | 2014 |
| Lulacreates Ltd | Professional & scientific | 2024 |
| Lumen ARC Productions Ltd | Information & communication | 2025 |
| Luuma Health Ltd | Manufacturing | 2026 |
| LUX Panel Bathrooms Ltd | Construction | 2026 |
| Lydia Claire Ltd | Other services | 2020 |
| M C Commercial Properties Limited | Real estate | 2025 |
| M L K Management Limited | Real estate | 2004 |
| M R Morgan (Engineering) Ltd | Professional & scientific | 2018 |
| M.I.C. Gymnastics Ltd | Arts & recreation | 2020 |
| M.J.L Heating & Plumbing Ltd | Construction | 2021 |
| Maals Watches Ltd | Wholesale & retail | 2017 |
| Made by Sonder Limited | Information & communication | 1999 |
| Majestic Health Ltd | Health & social care | 2019 |
| Make Murals and Workshops CIC | Arts & recreation | 2025 |
| Malexxa Limited | Wholesale & retail | 2020 |
| Maloco Advisory Services Limited | Financial services | 2019 |
| Mane Attraction (Kineton) Limited | Other services | 2004 |
| Manor Park (Poplar Road) Management Company Limited | Households | 2004 |
| Manzana Asset Management Limited | Real estate | 2021 |
| Marc Gristwood Design Limited | Administrative & support | 2007 |
| Margu-Trans Ltd | Transport & logistics | 2017 |