| Kvan Enterprises Limited | Other services | 2023 |
| Kvicevics Leveranse Limited | Extraterritorial | 2025 |
| Kvinna Ltd | Wholesale & retail | 2025 |
| KW Sales Solutions Ltd | Professional & scientific | 2008 |
| Kwanzaa Limited | Households | 2020 |
| KWB Construction Limited | Construction | 2020 |
| KWB Property Developments Limited | Real estate | 2021 |
| KWD Glasgow Ltd | Wholesale & retail | 2024 |
| Kwells Partners Ltd | Professional & scientific | 2026 |
| Kwelt Ltd | Wholesale & retail | 2020 |
| Kwik Staff Ltd | Administrative & support | 2019 |
| Kwikt Limited | Information & communication | 2020 |
| Kwok Chun Limited | Hospitality | 2008 |
| KWR Fire and Security Limited | Administrative & support | 2020 |
| KWS Properties Ltd | Real estate | 2025 |
| KXM Courier Ltd | Transport & logistics | 2023 |
| Kyamnep Limited | Information & communication | 2025 |
| KYD Express Ltd | Transport & logistics | 2015 |
| Kyfinn Ltd | Administrative & support | 2017 |
| Kyle Edwards Travel Limited | Transport & logistics | 2019 |
| Kyle Spiller Limited | Professional & scientific | 2020 |
| Kylona Viro Ltd | Education | 2025 |
| Kymk Global Ltd | Wholesale & retail | 2024 |
| Kyndra Hub Ltd | Other services | 2025 |
| Kynera Commerce Solutions Ltd. | Wholesale & retail | 2025 |
| Kyniska Advocacy Limited | Education | 2021 |
| Kyojo Ltd | Health & social care | 2025 |
| Kyona Holdings Limited | Financial services | 2019 |
| Kyrandor Ltd | Wholesale & retail | 2025 |
| Kyrie Capital Limited | Real estate | 2025 |
| Kyrylgyz Limited | Wholesale & retail | 2025 |
| Kytes Travel and Tour Ltd | Transport & logistics | 2019 |
| Kyto Holdings Ltd | Wholesale & retail | 2023 |
| Kyvra Technologies Limited | Professional & scientific | 2025 |
| KZ Labs Ltd | Manufacturing | 2019 |
| KZ Solutions Ltd | Education | 2019 |
| Kzariq Limited | Professional & scientific | 2015 |
| L & a Interiors Limited | Construction | 2020 |
| L & C Survey and Engineering Ltd | Construction | 2016 |
| L & D Asset Management Ltd | Financial services | 2026 |
| L & D Transport Limited | Transport & logistics | 2006 |
| L & E Price Limited | Health & social care | 2013 |
| L & H (London) Ltd | Construction | 2011 |
| L & H Developments Limited | Real estate | 2021 |
| L & L Caerphilly Ltd. | Real estate | 2015 |
| L & M Property Rental Limited | Real estate | 2017 |
| L & S Property Renovation and Maintenance Limited | Households | 2021 |
| L & T Property Limited | Financial services | 2025 |
| L a Emery Building Services Ltd | Construction | 2022 |
| L and J Therapy Ltd | Health & social care | 2019 |
| L and K Cleaning Services Limited | Construction | 2017 |
| L Brown Consulting Ltd | Financial services | 2011 |
| L Burr Properties Ltd | Real estate | 2024 |
| L C Carpentry Limited | Construction | 2014 |
| L C Electrical (Cardiff) Limited | Construction | 2012 |
| L Casey Social Care Limited | Health & social care | 2013 |
| L D Rees Limited | Construction | 2011 |
| L E Lighting Limited | Information & communication | 2011 |
| L Fashion Trading Ltd | Wholesale & retail | 2025 |
| L H Evans Properties Limited | Real estate | 2020 |
| L Haworth Property Management Limited | Administrative & support | 2017 |
| L J Accountants Limited | Professional & scientific | 2009 |
| L J Aherne Limited | Professional & scientific | 2016 |
| L J Bibby Engineering Ltd | Professional & scientific | 2016 |
| L J Freeholds Limited | Households | 2022 |
| L J G Management Ltd | Construction | 2024 |
| L M & T Property Limited | Real estate | 2025 |
| L M Recycle Ltd | Administrative & support | 2026 |
| L Mile Limited | Wholesale & retail | 2023 |
| L Padua Ltd | Health & social care | 2022 |
| L Pippin Decorators Limited | Construction | 2015 |
| L R Graphics Ltd | Other services | 2006 |
| L R S Services Limited | Construction | 2003 |
| L Robinson Ltd | Education | 2021 |
| L S Doors Realisations Limited | Manufacturing | 2002 |
| L S Hughes Will Writing Services LLP | | 2022 |
| L S Management Group Refurbs Ltd | Construction | 2020 |
| L Shape Ltd | Manufacturing | 2018 |
| L T Civils Ltd | Construction | 2018 |
| L W Motors Ltd | Wholesale & retail | 2021 |
| L Wing International Trading Co., Limited | Professional & scientific | 2011 |
| L&A Creations Ltd | Hospitality | 2025 |
| L&B Shop Ltd | Wholesale & retail | 2025 |
| L&C Pointing Specialist Ltd | Construction | 2024 |
| L&C Property Holdings Ltd | Real estate | 2025 |
| L&F Fabrication & Fencing Ltd | Manufacturing | 2024 |
| L&I Life Builders Limited | Construction | 2024 |
| L&J Services Ltd | Financial services | 2018 |
| L&K Real Estate Limited | Real estate | 2023 |
| L&L Prestige Worldwide Limited | Financial services | 2025 |
| L&P Fine Meats and Sausages Limited | Wholesale & retail | 2019 |
| L&R Reliable Services Limited | Administrative & support | 2018 |
| L&Tl Properties Limited | Real estate | 2022 |
| L&V Hand Car Wash Ltd | Administrative & support | 2022 |
| L&Z Holdings Ltd | Real estate | 2025 |
| L'A'W Security Specialists Limited | Administrative & support | 2012 |
| L'Aubedupasduloup Ltd | Wholesale & retail | 2025 |
| L'Ma Network Ltd | Information & communication | 2025 |
| L'Revolution Beauty Ltd | Wholesale & retail | 2015 |
| L-L Living Ltd | Real estate | 2020 |