| KKB Consultancy Services Limited | Professional & scientific | 2010 |
| KL Solutions Ltd | Professional & scientific | 2024 |
| KL Woodland Management Ltd | Administrative & support | 2019 |
| Klimatec Holdings Limited | Financial services | 2019 |
| Klimatec Limited | Construction | 2004 |
| Klimato Limited | Professional & scientific | 2021 |
| KLO Partners K Ltd | Professional & scientific | 2014 |
| Knole Management Limited | Households | 1988 |
| Knud E.Hansen (UK) Limited | Professional & scientific | 2008 |
| KOK Engineering Limited | Professional & scientific | 2017 |
| Kolshi Restaurant Limited | Hospitality | 2020 |
| Kona Consultancy Limited | Information & communication | 2013 |
| Konekta UK Limited | Information & communication | 2022 |
| Kope Ltd | Construction | 2008 |
| KP (Kineton) Limited | Wholesale & retail | 2019 |
| KPG Associates Ltd | Construction | 2013 |
| Kraemer Limited | Administrative & support | 2009 |
| KRE (Quartermile) LLP | | 2025 |
| Kreesh Community Events CIC | Health & social care | 2024 |
| KRM Group of Companies Ltd | Wholesale & retail | 2023 |
| KRS Hvac Ltd | Professional & scientific | 2025 |
| Krupa Gallery Limited | Wholesale & retail | 2024 |
| Ksgs Designs Ltd | Construction | 2021 |
| KTS Auto Services Limited | Wholesale & retail | 2024 |
| KUA Property Ltd | Real estate | 2024 |
| Kudlian Software Ltd | Information & communication | 1998 |
| Kudos Rental Ltd | Wholesale & retail | 2021 |
| Kumilin Ltd | Wholesale & retail | 2020 |
| Kustombuilt Limited | Manufacturing | 2013 |
| Kyeo Studio Limited | Professional & scientific | 2021 |
| Kynostic M.G.A Ltd | Administrative & support | 2016 |
| KZN Real Estate Limited | Real estate | 2023 |
| KZN Real Estate Ventures Limited | Financial services | 2025 |
| L & R Partners Ltd | Professional & scientific | 2022 |
| L Evans Properties Limited | Construction | 2024 |
| L J Hughes Ltd | Information & communication | 2021 |
| L J Smith Hair Limited | Other services | 2023 |
| L&D Sunshine Property Ltd | Real estate | 2022 |
| L&K Westgate Stores Ltd | Wholesale & retail | 2019 |
| L&M Investments Limited | Real estate | 2025 |
| L.Packer Builders Limited | Construction | 2016 |
| LA Mesa Foods Ltd. | Hospitality | 2016 |
| LAA Events Ltd | Arts & recreation | 2019 |
| Laceby Cairns Investments Ltd | Real estate | 2025 |
| Lainco Holding Limited | Financial services | 2024 |
| Lakha Property & Management Limited | Real estate | 2015 |
| Lambeau Ltd | Manufacturing | 2020 |
| Lambsdons Ltd | Wholesale & retail | 2022 |
| Lammas Court Residents' Association (Coventry) Limited | Households | 1998 |
| Land Boon Limited | Wholesale & retail | 2020 |
| Land Developments (Rental Properties) Limited | Extraterritorial | 2003 |
| Land Developments (South West) Limited | Extraterritorial | 2003 |
| Land of Prints Ltd | Wholesale & retail | 2024 |
| Landed Estate Management Limited | Professional & scientific | 2022 |
| Landia (UK) Limited | Other services | 1994 |
| Landon Kingsway Trading Limited | Manufacturing | 2016 |
| Landsul Limited | Construction | 2012 |
| Lane Ascend Ltd | Professional & scientific | 2025 |
| Lanesra Consultancy Limited | Professional & scientific | 2025 |
| Langley Meadows Management Company Limited | Households | 2017 |
| Langmere Marketing Consultants Ltd | Information & communication | 2025 |
| Larchview Projects Limited | Professional & scientific | 2013 |
| Laser Tech UK, Ltd. | Wholesale & retail | 2019 |
| Lasercarepro Limited | Information & communication | 2026 |
| Lask Developments Ltd | Real estate | 2024 |
| Lassannai Ltd | Professional & scientific | 2019 |
| Later Creator Limited | Professional & scientific | 2025 |
| Latrigg Engineering Ltd | Professional & scientific | 2020 |
| Laughing Bear Ltd | Information & communication | 2023 |
| Launchpad Skills Ltd | Education | 2025 |
| Lavant Finance Ltd | Financial services | 2025 |
| Lavelle Bridal Couture Ltd | Wholesale & retail | 2021 |
| LB Finance Services Ltd | Professional & scientific | 2021 |
| LBC Wine Supplies Ltd | Wholesale & retail | 2024 |
| Lcps Accounting Limited | Professional & scientific | 2018 |
| LDJ Lewis Consultants Limited | Construction | 2017 |
| LE Bistro 9/7 Ltd | Hospitality | 2018 |
| LEA Management Team Limited | Professional & scientific | 2018 |
| Leadership & Change Solutions Ltd | Professional & scientific | 2024 |
| Leadership Explored Limited | Education | 2016 |
| Leading Edge Performance Consulting Ltd | Professional & scientific | 2025 |
| Leam Athletics Academy Ltd | Arts & recreation | 2017 |
| Leamington Electronics Ltd | Wholesale & retail | 2019 |
| Leamington Jewellery Repairs Limited | Other services | 2022 |
| Leamington Marathi Ltd | Other services | 2025 |
| Leamington Psychology Ltd | Health & social care | 2026 |
| Leamington Spa Cleaning Ltd | Administrative & support | 2020 |
| Leamington Tree Care Limited | Administrative & support | 2024 |
| Leamington Wedding Boutique Ltd | Wholesale & retail | 2014 |
| Leargas II Limited | Administrative & support | 2025 |
| Leargas Ltd | Professional & scientific | 2021 |
| LEARN2GETHER Limited | Education | 2023 |
| Lebanese Restaurants Ltd | Hospitality | 2010 |
| LEE Marsh Associates Ltd | Other services | 2015 |
| Legacy Pixels LAB Ltd | Information & communication | 2024 |
| Legend Juice Coffee Company Limited | Wholesale & retail | 2020 |
| Legion Brickworks (Warwickshire) Limited | Construction | 2022 |
| Leiab Windows Ltd | Construction | 2025 |
| Leicester IT Limited | Information & communication | 2013 |
| Leightscreates Ltd | Professional & scientific | 2019 |