| KMD Rentals Ltd | Administrative & support | 2025 |
| Knightcare Limited | Health & social care | 2023 |
| Knights Armour Ltd | Manufacturing | 2025 |
| Knot Homes Limited | Construction | 2026 |
| Knowab Grab Hire Ltd | Water & waste | 2025 |
| Knowab Holdings Ltd | Financial services | 2024 |
| Knowledge IS Power Ltd | Information & communication | 2019 |
| Kobbypam Limited | Health & social care | 2022 |
| Kondjo Consulting Ltd | Professional & scientific | 2020 |
| Kora Advisory Limited | Information & communication | 2025 |
| Kore Elements Limited | Wholesale & retail | 2026 |
| KP Dental Solutions Limited | Health & social care | 2025 |
| KP Risk Consulting Ltd | Financial services | 2020 |
| KPS' Wicker and Wood Ltd | Real estate | 2025 |
| Krkonose Ltd | Construction | 2020 |
| KSL Tiling Limited | Construction | 2008 |
| Kuchannel Limited | Manufacturing | 2014 |
| KVS Performance Limited | Professional & scientific | 2018 |
| Kwame Osei Studios Ltd | Professional & scientific | 2021 |
| Kyembas Ltd | Health & social care | 2022 |
| L D & M Limited | Real estate | 2013 |
| L&F Utilities Ltd | Construction | 2019 |
| L&L Industries Ltd | Real estate | 2023 |
| L.A. Building Services Ltd | Construction | 2018 |
| L.Anirudh Ltd | Financial services | 2021 |
| L.Bagatti's Properties Limited | Real estate | 2025 |
| L.E Trades Limited | Construction | 2026 |
| Laila Enterprise Ltd | Hospitality | 2016 |
| Lainan Limited | Professional & scientific | 2018 |
| Lalaji Ltd | Wholesale & retail | 2024 |
| Laroc Lettings Ltd | Real estate | 2026 |
| Laserstream Limited | Information & communication | 2009 |
| Laturn Estates Ltd | Real estate | 2020 |
| Launch and Lead Talent Ltd | Administrative & support | 2026 |
| Laura Jade Home Limited | Wholesale & retail | 2024 |
| Lavender Fresh Services Ltd | Other services | 2016 |
| Lavender Space Developments Limited | Real estate | 2025 |
| Lavid Works Ltd | Construction | 2024 |
| LB Controls Ltd | Construction | 2018 |
| LCA UK Holdings Limited | Financial services | 2025 |
| Ldaj Limited | Health & social care | 2023 |
| LDS London Limited | Wholesale & retail | 2018 |
| LEB Properties Ltd | Real estate | 2018 |
| Legacy Line Group Limited | Information & communication | 2024 |
| Legend Aspect Limited | Construction | 2010 |
| Lemur Care Limited | Health & social care | 2022 |
| LES Dartnell L Limited | Transport & logistics | 2026 |
| Letsma Ltd | Information & communication | 2017 |
| Letts Property Management Ltd | Real estate | 2021 |
| LG Project Finance Limited | Professional & scientific | 2013 |
| LIA Nails Ltd | Other services | 2026 |
| Liberty Beauty Ltd | Public administration | 2023 |
| Light Works LED Ltd | Manufacturing | 2025 |
| Lighten the Load Ltd | Health & social care | 2025 |
| Linebroker Limited | Information & communication | 2011 |
| Lingbites Ltd | Hospitality | 2025 |
| Linwood Residential Care Services Limited | Health & social care | 2018 |
| Liph Long Solutions Ltd | Arts & recreation | 2022 |
| Lisa Hughes Tech Consulting Limited | Information & communication | 2024 |
| Listening Lounge Therapy Ltd | Extraterritorial | 2025 |
| Little Falcon Pictures Ltd | Information & communication | 2017 |
| Little Minds Consultancy Limited | Education | 2024 |
| Live Long Healthy Limited | Health & social care | 2024 |
| Lizard IT Solutions Ltd | Extraterritorial | 2014 |
| LJO Consultancy Services Ltd | Professional & scientific | 2023 |
| LL Builders Ltd | Construction | 2021 |
| Lloret Control Systems Limited | Construction | 1983 |
| Lloret EOT Limited | Administrative & support | 2020 |
| Lloret F&S Holdings Limited | Construction | 2018 |
| Lloret Fire Solutions Limited | Construction | 1977 |
| Lloret Holdings Limited | Professional & scientific | 2000 |
| Lloret Maintenance Limited | Administrative & support | 1999 |
| LNL Private Ltd | Information & communication | 2026 |
| Locktech Group Ltd | Administrative & support | 2023 |
| Londis Coulsdon Limited | Wholesale & retail | 2024 |
| London Fire Limited | Construction | 2016 |
| London Leasing Limited | Wholesale & retail | 2013 |
| London Maintenance Company Limited | Construction | 2019 |
| London Space Construction Ltd | Construction | 2021 |
| Longbright Ltd | Financial services | 2025 |
| Longes Consulting Ltd | Professional & scientific | 2020 |
| Longridge View 2009 Ltd | Real estate | 2009 |
| Loopspeed Ltd | Information & communication | 2018 |
| Lorettas Cafe & Cakes Ltd | Manufacturing | 2025 |
| Lorsha Ltd | Other services | 2023 |
| Lost in Limbo Garments Ltd | Wholesale & retail | 2025 |
| Lotus Clean Ltd | Administrative & support | 2026 |
| Louis Tomazou Limited | Administrative & support | 2011 |
| Love Building Group Limited | Construction | 2025 |
| Love From Cyprus - Boutique Wine and Zivania Ltd | Wholesale & retail | 2025 |
| Love Plumbing Limited | Construction | 2018 |
| LPD Retail Ltd | Wholesale & retail | 2025 |
| LSC Broking Ltd | Financial services | 2014 |
| Lucky Star Property Management Ltd | Real estate | 2021 |
| Ludlow Lane Solicitors Ltd | Professional & scientific | 2017 |
| Lumina Medical Aesthetics Ltd | Other services | 2023 |
| Luminor Marketing Consulting Ltd | Professional & scientific | 2024 |
| Lumorabeauty Ltd | Information & communication | 2026 |
| Lunar Prospects Ltd | Real estate | 2024 |
| Luxury Candle Makers Ltd | Wholesale & retail | 2026 |