| Knightsbridge Therapy Ltd | Health & social care | 2026 |
| Knokode Limited | Information & communication | 2009 |
| Know WHO YOU ARE Ltd | Other services | 2017 |
| Knox London Limited | Real estate | 2024 |
| Komiyo Ltd | Wholesale & retail | 2026 |
| Kona Interiors Ltd | Construction | 2021 |
| Konocto Limited | Information & communication | 2023 |
| Korr Insur Limited | Information & communication | 2018 |
| Kothea Limited | Wholesale & retail | 1999 |
| Kraja Decorating Ltd | Construction | 2024 |
| Krish Catering PVT Ltd | Hospitality | 2025 |
| KRS Management Services Ltd. | Professional & scientific | 2012 |
| KT Yacht Services Ltd | Administrative & support | 2018 |
| Kupe International Ltd | Professional & scientific | 2020 |
| Kyle Casting Ltd. | Arts & recreation | 2001 |
| KZ Property Ltd | Real estate | 2019 |
| L & S West Consulting Limited | Professional & scientific | 2016 |
| L J Motorcycle Repairs Limited | Wholesale & retail | 2009 |
| L Spoons Consulting Limited | Other services | 2017 |
| L&E Nunn Ltd | Real estate | 2011 |
| LA Folie Limited | Real estate | 2024 |
| LA Petite École Française D'Elmbridge Limited | Education | 2015 |
| Lacey & Law Limited | Administrative & support | 2017 |
| Lake Nights Ltd | Hospitality | 2021 |
| Lake-Johnson Properties Limited | Real estate | 1997 |
| Lamb Personnel Limited | Administrative & support | 2015 |
| Lampada Consultants Limited | Professional & scientific | 2016 |
| Lancaster Close Management Limited | Households | 2002 |
| Landau Consultancy Limited | Professional & scientific | 2009 |
| Landmark Trading Limited | Arts & recreation | 1995 |
| Langham Partners Limited | Professional & scientific | 2021 |
| Lanigan High OR LOW Services Ltd | Water & waste | 2024 |
| Lantana Capital Ltd | Professional & scientific | 2020 |
| Lantana Ventures Limited | Professional & scientific | 2020 |
| Larges Lane 2 Ltd | Construction | 2024 |
| Larges Lane Ltd | Construction | 2021 |
| Last of the Line Limited | Other services | 2024 |
| Lavender (UK) Limited | Wholesale & retail | 2012 |
| LAYER17 ICT Ltd | Information & communication | 2015 |
| LCS Insights Limited | Administrative & support | 2025 |
| LEA Financial Strategy and Analysis Limited | Professional & scientific | 2009 |
| Leadlinker Ltd | Information & communication | 2011 |
| Lean Robotics Ltd | Professional & scientific | 2017 |
| Leanxr Limited | Administrative & support | 2026 |
| Learmonth Ltd | Information & communication | 2018 |
| Leasing Broker Limited | Administrative & support | 2020 |
| Leda Childcare Services Limited | Education | 2022 |
| LEE Knight Limited | Arts & recreation | 2015 |
| Leegrove Limited | Real estate | 2003 |
| Legacy Global Capital Ltd | Financial services | 2025 |
| Lemon Stone Properties Limited | Real estate | 2023 |
| LEVEL9 Networks Limited | Information & communication | 2007 |
| Levelle Consulting Ltd | Professional & scientific | 2024 |
| Leviathan Consultancy Limited | Professional & scientific | 2000 |
| LHW Business Consultancy Ltd | Professional & scientific | 2020 |
| Libe Limited | Information & communication | 2008 |
| Libra and INK Ltd. | Education | 2021 |
| Lichen Consulting Ltd | Administrative & support | 2021 |
| Life at Parliament View Limited | Real estate | 2000 |
| Lifestyle Medical Clinic Ltd | Health & social care | 2022 |
| Light ME UP Limited | Professional & scientific | 2024 |
| Lightfury Games Studio Ltd | Information & communication | 2024 |
| Lila Performance Management and Coaching Ltd | Professional & scientific | 2017 |
| Lindarons Ltd | Wholesale & retail | 2025 |
| Linden Court Residents Company Limited | Households | 1990 |
| Lindy Investments Ltd | Real estate | 2021 |
| Lion Finance Ltd | Financial services | 2025 |
| Lion Stone Property Ltd | Real estate | 2022 |
| Liquid Frequency Ltd | Arts & recreation | 2025 |
| Lissyco Ltd | Information & communication | 2025 |
| Listening Device Ltd | Information & communication | 2021 |
| Literacy Hive Ltd | Education | 2024 |
| Little Ballerina Ltd | Wholesale & retail | 2011 |
| Little Big Heart Ltd | Information & communication | 2026 |
| Little Fishes Soft Play Ltd | Other services | 2008 |
| Little Whisper Limited | Information & communication | 2012 |
| Live Streamers Company Limited | Information & communication | 2023 |
| Live Union Limited | Professional & scientific | 2008 |
| LIZ Stainthorpe Ltd | Professional & scientific | 2009 |
| LJC Creative Ltd | Professional & scientific | 2016 |
| LK Partners Limited | Professional & scientific | 2017 |
| Lkji Ltd | Information & communication | 2024 |
| Lock House (Manor Road) Residents Association Limited | Households | 1998 |
| Loeben Limited | Professional & scientific | 2006 |
| Loftedd Limited | Wholesale & retail | 2019 |
| Logan Road Day Nursery Limited | Health & social care | 2013 |
| London Consulting Solutions Ltd | Real estate | 2013 |
| London Contemporary School of Piano (International) Limited | Education | 2024 |
| London Contemporary School of Piano Ltd | Administrative & support | 2016 |
| London Perfume Factory Stratford Ltd | Wholesale & retail | 2017 |
| London Private Finance Limited | Other services | 1996 |
| London Resi Ltd | Real estate | 2015 |
| London Style Apartment Ltd | Real estate | 2026 |
| Longwater RTM Company Limited | Households | 2009 |
| Lordi Construction Ltd | Construction | 2026 |
| Lorium Privee Ltd | Administrative & support | 2025 |
| Lorraine Hartley Mathematics Consultancy Limited | Education | 2016 |
| Lorway Limited | Real estate | 2024 |
| Lottie Alexandra Ltd | Arts & recreation | 2015 |
| Loucerna Limited | Professional & scientific | 2024 |