| Kfirmin Limited | Hospitality | 2023 |
| Khione Tech Limited | Information & communication | 2024 |
| Kiang NAN Holdings Ltd | Hospitality | 2020 |
| Kibby Coaching Limited | Professional & scientific | 2023 |
| Kija Creatives Limited | Professional & scientific | 2022 |
| Kimberley Official Ltd | Other services | 2023 |
| King Group Holdings Limited | Construction | 2018 |
| Kishens Group Limited | Administrative & support | 2010 |
| Kishens Limited | Professional & scientific | 2005 |
| Kishens Wealth Management Limited | Professional & scientific | 2011 |
| Kittitian Homes Ltd | Construction | 2025 |
| KJ Sport Event Management Ltd | Education | 2024 |
| Klikkit Ltd | Professional & scientific | 2026 |
| Kmdspstation Road Ltd | Real estate | 2019 |
| KNA Limited | Real estate | 2017 |
| Knights & Knott Limited | Construction | 2017 |
| Kobus Group Ltd | Financial services | 2021 |
| Kobus Property Trading Ltd | Construction | 2021 |
| Kohinoor International Limited | Professional & scientific | 2025 |
| Koka & D Ltd | Hospitality | 2023 |
| Konel Limited | Health & social care | 2016 |
| Kontain Limited | Information & communication | 2022 |
| KPS Engineering Solutions Ltd | Professional & scientific | 2010 |
| Krista Marie Pottery Limited | Manufacturing | 2026 |
| Krushi Enterprise UK Limited | Other services | 2006 |
| KSS Drinks Limited | Wholesale & retail | 1999 |
| KT Facilities Management Limited | Real estate | 2017 |
| KTM Garden and Grounds Ltd | Agriculture & fishing | 2024 |
| KTS Construction Limited | Construction | 2014 |
| KTS Heating Services Ltd | Construction | 2020 |
| Kullar Holdings Ltd | Financial services | 2025 |
| Kullars London Limited | Real estate | 2025 |
| Kusi & Associates Limited | Professional & scientific | 2015 |
| KV Medical Limited | Health & social care | 2016 |
| Kymatic Limited | Information & communication | 2019 |
| Kyra Online Ltd | Wholesale & retail | 2025 |
| Kyriacou Consulting Ltd | Professional & scientific | 2017 |
| Kyvid Enterprise Ltd | Wholesale & retail | 2024 |
| L and R Sons Limited | Real estate | 2022 |
| L M Q Limited | Professional & scientific | 1997 |
| L&M Drywall Limited | Construction | 2018 |
| L. a. a. S. I. Aviation Limited | Other services | 1978 |
| L.D. Window Cleaners Limited | Administrative & support | 1999 |
| LA Bombone Limited | Information & communication | 2003 |
| Laburnum Court (Auckland Road) Residents Company Limited | Households | 1988 |
| Lakay Ltd | Transport & logistics | 2025 |
| Lakeside Ventures & Properties Ltd | Real estate | 2024 |
| LAL Investments Limited | Real estate | 2004 |
| Lamaquina Limited | Health & social care | 2022 |
| Lamidys Ltd | Real estate | 2022 |
| Lanacos Limited | Education | 2002 |
| Langdale Landscapes Limited | Administrative & support | 2001 |
| Lanmark Technical Services Limited | Extraterritorial | 2013 |
| Lapis Blue Limited | Wholesale & retail | 2025 |
| Largon Ltd | Real estate | 1988 |
| Larkview Properties Ltd | Construction | 2022 |
| Lars Wagner Bespoke Furniture Ltd | Wholesale & retail | 2018 |
| Latham Lambourne Ltd | Professional & scientific | 2011 |
| Lauren Makeup Ltd | Other services | 2023 |
| Lavan Designer Jewellery Ltd | Wholesale & retail | 2018 |
| Law of Addiction Ltd | Health & social care | 2016 |
| Lawrene Ltd | Information & communication | 2016 |
| Laya Healthcare Ltd | Health & social care | 2016 |
| Laya Properties Ltd | Real estate | 2023 |
| LB Performance Ltd | Information & communication | 2014 |
| LCF Consulting Limited | Other services | 2018 |
| LD Business Solutions Ltd | Professional & scientific | 2020 |
| Ldivine Foods Limited | Wholesale & retail | 2010 |
| Lead IT BE Ltd | Construction | 2017 |
| Leary & Co Group Ltd | Financial services | 2026 |
| Lewis Healthcare Limited | Wholesale & retail | 1976 |
| LH & MB Investments Ltd | Real estate | 2023 |
| LHE Design and Build Ltd | Construction | 2025 |
| LHE Limited | Construction | 2010 |
| Lifeshine Ltd | Arts & recreation | 2021 |
| Lift Services Direct Limited | Other services | 1998 |
| Light Affects Ltd | Construction | 2014 |
| Lightbox Two Ltd | Construction | 2017 |
| Lighten UP Electrical Ltd | Construction | 2008 |
| Lightning Volt Solutions Ltd | Construction | 2025 |
| Lilden Ltd | Manufacturing | 2025 |
| Lime Court Management Company Limited | Households | 1974 |
| Limoncello (Caterer & Delicatessen) Limited | Hospitality | 1999 |
| Linden Manor Limited | Construction | 2024 |
| Line Property Management Limited | Real estate | 2005 |
| Lingfell Ltd | Extraterritorial | 2022 |
| Lingwell Property Co.Limited | Real estate | 1960 |
| LINNA1990 Limited | Health & social care | 2014 |
| Liquid Plumbing Solutions Limited | Construction | 2009 |
| Liquorice Baby Ltd | Wholesale & retail | 2017 |
| Liskeard Gardens Tenants Association Limited (the) | Households | 1970 |
| Little Bexley Garage Ltd | Wholesale & retail | 2023 |
| Little Learners Club Ltd | Wholesale & retail | 2025 |
| Little Lovell’S Ltd | Arts & recreation | 2026 |
| Littleoaks Brentwood Ltd | Construction | 2025 |
| Live and Direct Limited | Administrative & support | 2016 |
| Live Hive Productions Ltd | Information & communication | 2026 |
| Livings Bookkeeping Ltd | Professional & scientific | 2025 |
| LK Electrical Ltd. | Construction | 2018 |
| Lkab IT Limited | Information & communication | 2023 |