| Lawrenny Yacht Station Limited | Administrative & support | 2006 |
| Lawtique Ltd | Wholesale & retail | 2025 |
| Lawto Ltd | Wholesale & retail | 2025 |
| LB Storage Ltd | Administrative & support | 2025 |
| Lcgh Poultry UK Ltd | Manufacturing | 2022 |
| LCM Property Management Limited | Extraterritorial | 2002 |
| LDE IP Services Limited | Information & communication | 2004 |
| Lebag Ltd. | Administrative & support | 2021 |
| Leben in Balance Ltd | Administrative & support | 2024 |
| Lebensarchitektur Ltd | Administrative & support | 2021 |
| Lebenswerke Ltd | Extraterritorial | 2021 |
| Legacy Life Stories and Media Ltd | Information & communication | 2024 |
| Lemuer Ltd | Wholesale & retail | 2019 |
| Lenarda Trade LLP | | 2019 |
| Let's Talk Design Limited | Manufacturing | 2025 |
| Letterson Property and Co Ltd | Wholesale & retail | 2026 |
| Letterson Trade and Co Ltd | Wholesale & retail | 2026 |
| Letterston Memorial Hall Limited | Professional & scientific | 2000 |
| Leventhia Health Ltd. | Administrative & support | 2024 |
| Leweston Cottage Company Ltd | Health & social care | 2022 |
| Lewis Pearson Ltd | Agriculture & fishing | 2008 |
| Lexton Grove Consultancy Limited | Education | 2015 |
| LFS International Ltd | Administrative & support | 2025 |
| LG Byrd Limited | Information & communication | 2013 |
| LHC Consultancy Limited | Health & social care | 2015 |
| Lidicuq Ltd | Wholesale & retail | 2023 |
| Life Coaching Ltd | Administrative & support | 2025 |
| LIFE2LIGHT Ltd | Extraterritorial | 2025 |
| Lighting UP Brixham CIC | Other services | 2020 |
| Lightvisions Ltd | Administrative & support | 2022 |
| Lilac Laundry and Cleaning Limited | Administrative & support | 2023 |
| Lilypad Manorbier Ltd | Hospitality | 2019 |
| Limelights International Ltd | Extraterritorial | 2024 |
| Linda Scott Limited | Financial services | 1999 |
| Linearsource Ltd | Administrative & support | 2023 |
| Link Express Logistics Ltd | Transport & logistics | 2024 |
| Linus Entertainment Limited | Information & communication | 2024 |
| Lionel Morgan Property Developer Ltd | Construction | 2025 |
| Little Cuckoo Farm Limited | Agriculture & fishing | 2026 |
| Little Grebe Creative CIC | Arts & recreation | 2024 |
| Little Hasguard Farm Limited | Agriculture & fishing | 2003 |
| Little Haven Boat Owners Association | Other services | 2006 |
| Little Lanterns Pembrokeshire CIC | Health & social care | 2025 |
| Little Legs Franchising Ltd | Education | 2021 |
| Little Pigs at Home Animal Sanctuary CIC | Agriculture & fishing | 2022 |
| Little Slade Farm Ltd | Hospitality | 2019 |
| Livebodybalance Ltd | Extraterritorial | 2021 |
| Lively Ventures Ltd | Administrative & support | 2025 |
| Living Quarter Properties (Porth) Limited | Construction | 2014 |
| LJ (Haverfordwest) Ltd | Real estate | 2021 |
| LJB Contracting Ltd | Agriculture & fishing | 2023 |
| LKN Contracting Ltd | Transport & logistics | 2015 |
| Llangwarren Management Company Limited | Households | 2001 |
| Llangwm Farms Ltd | Extraterritorial | 2017 |
| Llangwm Rugby Ltd | Arts & recreation | 2024 |
| Llanungar Fach Caravan Park and Campsite LLP | | 2014 |
| Llew Pembs Ltd | Construction | 2025 |
| Llewellin Properties Ltd | Real estate | 2026 |
| Llwynygorras CYF | Extraterritorial | 2021 |
| Llys Glasfryn Phase 1 Management Company Limited | Real estate | 2021 |
| LNS Builders Limited | Construction | 2015 |
| Lolo Corporation Ltd | Wholesale & retail | 2021 |
| London Recruits Film Ltd | Information & communication | 2016 |
| London Road (Pembroke) Management Company Limited | Real estate | 1987 |
| Loop Lead Consulting PC | | 2020 |
| Losh's Ltd | Wholesale & retail | 2021 |
| Loversun Ltd | Other services | 2021 |
| Lower Haythog Limited | Hospitality | 2003 |
| Lower Tancredston Farm Limited | Agriculture & fishing | 2002 |
| LP016220 LP | | 2014 |
| LP018749 LP | | 2017 |
| LP019037 LP | | 2017 |
| LP019438 LP | | 2018 |
| LP019439 LP | | 2018 |
| LP020026 LP | | 2019 |
| LP020260 LP | | 2019 |
| LP020438 LP | | 2019 |
| LP020641 LP | | 2019 |
| LP021165 LP | | 2020 |
| LP021285 LP | | 2020 |
| LP022828 LP | | 2022 |
| LP023821 LP | | 2024 |
| LPB Enterprises Ltd | Hospitality | 2022 |
| LPB Property Management Limited | Hospitality | 2025 |
| LPB Trading Limited | Hospitality | 2025 |
| LQE (MET) Ltd | Construction | 2017 |
| LST International Ltd | Administrative & support | 2023 |
| Ludchurch Farms Limited | Agriculture & fishing | 2002 |
| Lufoz International Ltd | Administrative & support | 2025 |
| Luminar Solutions Ltd | Administrative & support | 2025 |
| Lunabiz LP | | 2023 |
| Lynch Director of Photography Ltd | Professional & scientific | 2019 |
| M & C Davies Ltd | Agriculture & fishing | 2016 |
| M & S Town Planning Limited | Professional & scientific | 2023 |
| M & S Transport Limited | Transport & logistics | 2002 |
| M & SDP Roofing Contractors Limited | Construction | 2007 |
| M C R Race Cars Limited | Administrative & support | 2007 |
| M D Evans Limited | Financial services | 2024 |
| M. Dingley Jones (Electrical Services) Limited | Wholesale & retail | 1964 |
| M. G. Developments Limited | Construction | 2002 |