| Liquiline Water Tanker Services Ltd | Water & waste | 2020 |
| Lirida Support Services Limited | Health & social care | 2016 |
| Lirong LIN02 Ltd | Manufacturing | 2024 |
| Lirvant Ltd | Wholesale & retail | 2025 |
| Lis.Wa Consulting Ltd | Professional & scientific | 2023 |
| Lisa Macario Limited | Manufacturing | 2018 |
| Lisa Russell Independent Mortgage and Protection Advice Ltd | Financial services | 2024 |
| Lisa Williams International Interiors Ltd | Other services | 2019 |
| Lisa's Luxury Cheesecakes & the Crazy Bakes Ltd | Manufacturing | 2024 |
| Lisboa Cafe Limited | Hospitality | 2024 |
| Lisburn Investments UK Ltd | Real estate | 2024 |
| Lisca Services Limited | Education | 2025 |
| Lisova Ltd | Manufacturing | 2025 |
| List Networks Ltd | Information & communication | 2020 |
| Listen and Look Book Limited | Information & communication | 2020 |
| Listings on TAP Ltd | Professional & scientific | 2025 |
| Lisvane Coffee Co Ltd | Hospitality | 2023 |
| Lisvane Development Limited | Real estate | 2024 |
| Lisvane Holdings Ltd | Real estate | 2023 |
| Lisvane House Limited | Real estate | 2026 |
| Lisvane Legal Ltd | Professional & scientific | 2023 |
| Lisvane Livery Stables Limited | Agriculture & fishing | 2013 |
| Lisvane Management Services Ltd | Real estate | 2026 |
| Lisvane Panthers FC CIC | Arts & recreation | 2016 |
| LIT Adventures Ltd | Administrative & support | 2025 |
| Lita Invest Co. Limited | Extraterritorial | 2007 |
| Litbazar Ltd | Wholesale & retail | 2025 |
| Lite Sharp Ltd | Information & communication | 2019 |
| Litelearn Ltd | Information & communication | 2025 |
| Literation Limited | | 1921 |
| Litexpro Ltd | Wholesale & retail | 2022 |
| Litfin Communications Limited | Information & communication | 2020 |
| Lithemba Limited | Administrative & support | 2014 |
| Lithium Logistics Limited | Administrative & support | 2012 |
| Litho Economics Limited | Professional & scientific | 2009 |
| Lithos Capital Development Ltd | Wholesale & retail | 2019 |
| Litox Learning Limited | Information & communication | 2023 |
| Little 3 Healthcare Ltd | Health & social care | 2022 |
| Little Angels Flying Start Nurseries Ltd | Administrative & support | 2014 |
| Little Angels Nursery (Cardiff) Limited | Education | 2012 |
| Little Arrow Ltd | Hospitality | 2019 |
| Little Baby Big Child Limited | Real estate | 2018 |
| Little Big Thing CDF Ltd | Wholesale & retail | 2026 |
| Little Bird Films Ltd | Information & communication | 2017 |
| Little Brothers Ltd | Construction | 2019 |
| Little Butterflies Nursery Ltd | Health & social care | 2025 |
| Little Care Limited | Health & social care | 2024 |
| Little Cherubs Day Care Nursery Limited | Health & social care | 2002 |
| Little Chief Services Limited | Construction | 2015 |
| Little Corfu by Night Limited | Hospitality | 2022 |
| Little Country Cooks Ltd | Wholesale & retail | 2018 |
| Little Darlings Nursery Wales Limited | Education | 2017 |
| Little Dogs Hotel Ltd | Other services | 2021 |
| Little Door (the Pact II) Ltd | Information & communication | 2021 |
| Little Door (the Pact) Ltd | Information & communication | 2019 |
| Little Door (USM) Ltd | Information & communication | 2023 |
| Little Door Productions Ltd | Information & communication | 2019 |
| Little Dreamers Publishing Ltd | Arts & recreation | 2025 |
| Little Evan Environmental Protection Company Ltd | Real estate | 2011 |
| Little Explorers in the Park Ltd | Health & social care | 2020 |
| Little Friends Childcare Ltd | Education | 2019 |
| Little Green Giraffe Limited | Wholesale & retail | 2023 |
| Little Grey Woolf Limited | Information & communication | 2022 |
| Little Hedgehog Crafts Ltd | Wholesale & retail | 2025 |
| Little Kochi Ltd | Hospitality | 2022 |
| Little Learners After School Club Ltd | Health & social care | 2025 |
| Little Learning Bears Limited | Education | 2020 |
| Little Learning BEE Ltd | Education | 2021 |
| Little Limited | Manufacturing | 2023 |
| Little Lingua Ltd | Information & communication | 2024 |
| Little Lion Properties Limited | Real estate | 2024 |
| Little Love Baby Ltd | Wholesale & retail | 2017 |
| Little MAN Coffee Ltd | Hospitality | 2014 |
| Little Monstra Ltd | Wholesale & retail | 2019 |
| Little Notes Cardiff Ltd | Education | 2015 |
| Little Pads Ltd | Real estate | 2026 |
| Little Pearl Service Ltd | Transport & logistics | 2020 |
| Little People Playgroup@Oakfield Limited | Health & social care | 2020 |
| Little Snoring Construction Ltd | Construction | 2019 |
| Little Sparklers Childcare Ltd | Health & social care | 2019 |
| Little Squirrels Childcare Limited | Education | 2014 |
| Little Stars Childcare (Cardiff) Limited | Education | 2012 |
| Little Teds Nursery and Academy Ltd | Health & social care | 2018 |
| Little Vessel Ltd | Professional & scientific | 2009 |
| Little Waggle Ltd | Wholesale & retail | 2025 |
| Little West Management Company Limited | Households | 2007 |
| Littlechild & Haley Ltd | Professional & scientific | 2024 |
| Littlemadam Ltd | Wholesale & retail | 2020 |
| Littlemissmeena Ltd | Wholesale & retail | 2025 |
| Littlemoon’S 1 Ltd | Hospitality | 2025 |
| Littlestone Developments Limited | Construction | 2017 |
| Littrworksglobal CIC | Water & waste | 2025 |
| LIU Star Limited | Hospitality | 2023 |
| Liupei Group Ltd | Extraterritorial | 2021 |
| Liuyan Trade Ltd | Wholesale & retail | 2024 |
| LIV in Quarters Limited | Real estate | 2016 |
| Liva Property Ltd | Real estate | 2025 |
| Livada Fintech Ltd | Information & communication | 2021 |
| Livamar LLP | | 2025 |
| Livbright Ltd | Health & social care | 2024 |