| KS Town Planning Ltd | Professional & scientific | 2025 |
| Kssr Bargains Ltd | Wholesale & retail | 2025 |
| KTS Support Services Ltd | Administrative & support | 2024 |
| KTS Teamsolutions Ltd | Administrative & support | 2023 |
| Kurt Property Holdings Ltd | Real estate | 2026 |
| Kurt Transport Limited | Transport & logistics | 2023 |
| KVD Removals Ltd | Transport & logistics | 2021 |
| KVP Business Consulting Ltd | Administrative & support | 2020 |
| KX Howard Limited | Real estate | 2002 |
| KYC Accounting Ltd | Professional & scientific | 2021 |
| KYC Outsourcing Ltd | Professional & scientific | 2025 |
| Kyndacare (PVT) Limited | Health & social care | 2015 |
| Kyngshouton (Houghton Regis) Residents Management Company Limited | Households | 2016 |
| L K Spares Limited | Wholesale & retail | 2012 |
| L T W Trading Ltd | Wholesale & retail | 2021 |
| L&B Consulting Ltd | Professional & scientific | 2025 |
| L&M Bespoke Designs Ltd | Wholesale & retail | 2021 |
| L.A. Packing Company Limited | Manufacturing | 1974 |
| L.M.M Property Management Ltd | Real estate | 2025 |
| L.W. (Developments) Limited | Construction | 1979 |
| LA Maria of Woburn Sands Ltd | Hospitality | 2018 |
| LA Strada Pizza Co Ltd | Hospitality | 2026 |
| Lagits CIC | Public administration | 2025 |
| Lakeside (Hampton Hargate) Management Company Limited | Households | 2000 |
| Lakeside Village Management Company Limited | Households | 1991 |
| Lambert & Barclay Limited | Wholesale & retail | 2015 |
| Langley Park (Sutton Coldfield) Management Company Limited | Households | 2003 |
| Language Direct Limited | Professional & scientific | 2012 |
| Lanka Consultants Limited | Professional & scientific | 2023 |
| Lanthorne Place (Broadstairs) Residents Management Company Limited | Households | 2022 |
| Lanthorne Place Darwell House (Broadstairs) Management Company Limited | Households | 2022 |
| Larchmere (Coalville) Management Company Limited | Households | 2004 |
| Larchwood Court Management Co. Limited | Households | 1971 |
| Larks Meadow (Ipswich) Management Company Limited | Households | 2004 |
| Lauren Trading Limited | Information & communication | 2014 |
| Lavant Views Management Company (Chichester) Limited | Real estate | 2021 |
| Lavelle's Hair Ltd | Other services | 2014 |
| Lavelles Hair (Potters Bar) Ltd | Other services | 2019 |
| Lavender Grove (Corby) Management Company Limited | Households | 2005 |
| Lavish Nails & Beauty Ltd | Other services | 2023 |
| Lawless Sandhill Ltd | Manufacturing | 2009 |
| Lawn Enforcement Garden and Trees Limited | Administrative & support | 2015 |
| Lawrence Gardens (Barton) Management Company Limited | Households | 2020 |
| Lawsonstead Management Company Limited | Households | 2015 |
| Lazy Hound Productions Ltd | Wholesale & retail | 2019 |
| LBS Distribution Ltd | Wholesale & retail | 2007 |
| LDN Graphics Ltd | Other services | 2020 |
| LDN Holdings Limited | Other services | 2022 |
| LE Golden Touch Barbers Ltd | Other services | 2025 |
| LEA Grange (ST Helens) Management Company Limited | Households | 2019 |
| LEA Valley Electrics Limited | Construction | 2014 |
| LEA Valley Ice Cream & Catering Ltd | Wholesale & retail | 2017 |
| Leach (Brookmans Park) Limited | Real estate | 1957 |
| Leach Properties Limited | Real estate | 1957 |
| Leach-Lewis Limited | Professional & scientific | 1967 |
| Leas Park Management Limited | Households | 1988 |
| Leaside Estate Limited | Real estate | 2016 |
| Leaside Management Company Limited | Households | 2022 |
| Ledsham Garden Village Management Company Limited | Households | 2017 |
| LEE Couriers Ltd | Transport & logistics | 1997 |
| Lefroy Brooks Diffusion Limited | Wholesale & retail | 1982 |
| Legacy Building Group Ltd | Construction | 2025 |
| Legacy Developers Limited | Construction | 2022 |
| Legacy Feature Productions Ltd | Information & communication | 2025 |
| Legacy MLT Transport Ltd | Transport & logistics | 2025 |
| Leisure Amusements Ltd | Arts & recreation | 2026 |
| Lemel Hair Studio Ltd | Other services | 2022 |
| Lemur Investments Limited | Real estate | 1960 |
| Leose Global Ltd | Wholesale & retail | 2025 |
| Letcombe Park Management Company Limited | Households | 2003 |
| Level UP Brickwork Limited | Construction | 2026 |
| Lewes Road (Scaynes Hill) Management Co Ltd | Households | 2019 |
| Lexmar Direct Limited | Administrative & support | 2013 |
| Lgbt Great Limited | Professional & scientific | 2020 |
| Lhass Ltd | Construction | 2025 |
| Li's WOK Limited | Hospitality | 2018 |
| Liberty Rise Phase 1 (Hertford) Management Company Limited | Households | 2013 |
| Liberty Villas Management Company Limited | Households | 2004 |
| Lifestyle Consultancy Limited | Education | 2019 |
| Lift Shaft Care Ltd | Construction | 2018 |
| Light Source Supplies Limited | Wholesale & retail | 1987 |
| Lightning IT Ltd | Information & communication | 2025 |
| Lilibet Gardens Residents Management Company Limited | Households | 2023 |
| Lily Brook Management Company Limited | Households | 2001 |
| Lime Grove Mews Residents Limited | Professional & scientific | 2011 |
| Lime Kiln Place Management Company Ltd | Households | 2019 |
| Limos the Goddess Limited | Hospitality | 2020 |
| Linbal (Management) Ltd. | Households | 1988 |
| Linden Place Residents Association Limited | Households | 2001 |
| Link Chartering Limited | Transport & logistics | 1977 |
| Lister Velvet Mill Management Company Limited | Professional & scientific | 2006 |
| Little Beauty Academy Ltd | Other services | 2021 |
| Little Dominie Management Company Limited | Households | 2005 |
| Little Glen (Glen Parva) Management Company Limited | Households | 2020 |
| Little Hummingbird Nursery Ltd | Education | 2022 |
| Little Red Rooster Limited | Professional & scientific | 2021 |
| Little Red Rooster PR Limited | Professional & scientific | 2019 |
| Little Willows Childcare Ltd | Health & social care | 2018 |
| Little Wonderland Ltd | Education | 2020 |
| Livewell Health & Fitness Ltd | Arts & recreation | 2014 |