| Knowle Gate Holdings Limited | Real estate | 1990 |
| Koexa Ltd | Health & social care | 2024 |
| Koffi Co Ltd | Wholesale & retail | 2018 |
| Kora Cleaning Services Limited | Administrative & support | 2019 |
| Koreflex Ltd | Manufacturing | 2026 |
| KP Tuition Ltd | Education | 2026 |
| Krap Ltd | Arts & recreation | 2021 |
| KTO (Fareham) Ltd | Arts & recreation | 2020 |
| KTO (Reading) Ltd | Arts & recreation | 2022 |
| Kuljeet Construction Limited | Construction | 2018 |
| KW23 Limited | Administrative & support | 2026 |
| L & B Property Lets Limited | Real estate | 2021 |
| Laceeze Ltd | Other services | 2016 |
| Laiye UK Limited | Information & communication | 2021 |
| Lakelight Limited | Wholesale & retail | 1989 |
| Lalbagh Limited | Households | 1963 |
| Lambert and Sons Developments Ltd | Construction | 2023 |
| Lamco Limited | Real estate | 2020 |
| Landguard House Limited | Hospitality | 2015 |
| Langdon House Management (Canford Cliffs) Limited | Households | 1997 |
| Langley Civil Engineering Limited | Construction | 2025 |
| Langskip Ltd | Professional & scientific | 2023 |
| LAO Investments Limited | Real estate | 2021 |
| Lark Lettings Ltd | Real estate | 2023 |
| Lastre Grande Ltd | Wholesale & retail | 2019 |
| Latitude 5053 Ltd | Real estate | 2022 |
| Laurence Joseph Ltd | Households | 2024 |
| Leadara Ltd | Information & communication | 2024 |
| Lean 4 Fitness (Ringwood) Ltd | Arts & recreation | 2021 |
| Lean Rail Engineering Ltd | Professional & scientific | 2016 |
| Leather Supplies Limited | Wholesale & retail | 2021 |
| Ledfree Limited | Administrative & support | 2014 |
| Legal Force Limited | Administrative & support | 2014 |
| Lelovate Ltd | Administrative & support | 2026 |
| Lenahoney Consulting Limited | Administrative & support | 2015 |
| LEO Xander Limited | Administrative & support | 2020 |
| Letchers Limited | Professional & scientific | 2005 |
| Letchers Solicitors LLP | | 2011 |
| Lets Accommodate Hampshire Ltd | Real estate | 2009 |
| Letters & Logos Limited | Manufacturing | 1988 |
| Lewis Nicholls Film & Television Lighting Ltd | Arts & recreation | 2021 |
| LG Realizations 2025 Limited | Wholesale & retail | 2014 |
| Libertey Estates Limited | Construction | 2010 |
| Libra Business Solutions Limited | Professional & scientific | 2017 |
| Lifetime Living Limited | Real estate | 2018 |
| Lift & Controller Products Ltd | Wholesale & retail | 2009 |
| Light Paint Limited | Wholesale & retail | 2022 |
| Lighthouse Risk and Security Ltd | Information & communication | 2019 |
| Lime Lodge Residents Limited | Households | 2022 |
| Limekiln Extension Limited | Financial services | 2017 |
| Limekiln Grid Limited | Construction | 2020 |
| Limekiln Holdco Limited | Financial services | 2023 |
| LIN Brook Carp Fishery Limited | Arts & recreation | 2016 |
| Linden Court (Ringwood) Management Company Limited | Households | 2012 |
| Lindy Stuart Limited | Wholesale & retail | 2013 |
| Linen and Lace Ltd | Arts & recreation | 2019 |
| Lion & Stone Growth Advisory Ltd | Financial services | 2025 |
| Lion Road Publishing Ltd | Wholesale & retail | 2022 |
| Lions Hill Medical Limited | Health & social care | 2020 |
| Little Chaseborough Limited | Households | 2006 |
| Little Honey Bears Ltd | Education | 2020 |
| Little Monkey Minders Limited | Health & social care | 2023 |
| Little Munchkins Limited | Education | 2011 |
| Live Receipts Limited | Administrative & support | 2013 |
| Living the Dream NOW Limited | Professional & scientific | 2017 |
| Livwel Limited | Real estate | 2023 |
| LJ Flynn Properties Ltd | Real estate | 2023 |
| LJB Holdings Limited | Financial services | 2021 |
| LJK Vehicle Service Limited | Wholesale & retail | 2015 |
| LJT Surveying Limited | Other services | 2015 |
| LND Consulting Limited | Professional & scientific | 2021 |
| LOA Morris Properties Limited | Real estate | 2024 |
| Loaded YAK Ltd | Arts & recreation | 2022 |
| Lock Stock and Loaded Ltd | Wholesale & retail | 2019 |
| Logical Analytics Limited | Administrative & support | 2021 |
| Logicinfo Consulting (UK) Limited | Information & communication | 2012 |
| Logistix Group Ltd | Administrative & support | 2024 |
| Logodepot Limited | Professional & scientific | 2013 |
| Lone Star of London Ltd | Wholesale & retail | 2023 |
| Long Lane Farm Limited | Construction | 2018 |
| Long Term Developments Ltd | Construction | 2025 |
| Longman Racing Ltd | Wholesale & retail | 2018 |
| Loose Connections Ltd | Information & communication | 2024 |
| Loose Legal Ltd | Professional & scientific | 2020 |
| Lorenzo's Drainage Solutions Ltd | Water & waste | 2023 |
| Lorne Park Flat Management Company Limited | Households | 1988 |
| Lorne Park Road Freehold Limited | Households | 2017 |
| Lost+Found Ltd | Information & communication | 2026 |
| Lovitaly Ltd | Hospitality | 2014 |
| Lovitaly Wimborne Ltd | Hospitality | 2025 |
| LOW Carbon Alliance Limited | Real estate | 2010 |
| Lower Your Household Bills Ltd | Other services | 2022 |
| LP Drainage Limited | Other services | 2020 |
| LRM Group Holdings Ltd | Financial services | 2022 |
| LRM Residential Ltd | Real estate | 2022 |
| LRM Retail Ltd | Wholesale & retail | 2020 |
| LSA Limited | Professional & scientific | 2025 |
| LSI Agency Limited | Wholesale & retail | 2020 |
| Luapa Limited | Real estate | 2022 |
| Lucid State AI Ltd | Information & communication | 2024 |