| Focus NOT Found Ltd | Information & communication | 2025 |
| Fohn Ltd | Information & communication | 2021 |
| Forbes Bowman Ltd | Administrative & support | 2017 |
| Forte's Rhyl Ltd | Extraterritorial | 2018 |
| Fuse Youth Ltd | Arts & recreation | 2018 |
| G & W Jones Limited | Construction | 2010 |
| G Roberts Limited | Manufacturing | 2002 |
| G. & A.E. Jones Limited | Agriculture & fishing | 1997 |
| Gadsby Housing Ltd | Real estate | 2026 |
| Gardd Gymunedol Conwy Community Garden Ltd | Other services | 2024 |
| Gardener & John Ltd. | Professional & scientific | 2013 |
| Garrick Mansions Freeholders Limited | Real estate | 2022 |
| Gawain Developments CYF | Construction | 2012 |
| GB Comms Ltd | Manufacturing | 2015 |
| GD Civils Ltd | Administrative & support | 2016 |
| Geodetic Software Systems Limited | Information & communication | 1994 |
| Geoscience Wales Limited | Professional & scientific | 2002 |
| Gmec-Services Ltd | Administrative & support | 2010 |
| GMP Clinibuild Ltd | Construction | 2024 |
| Gofal Angel Care Ltd | Administrative & support | 2022 |
| Goleuo Therapy Ltd | Hospitality | 2022 |
| Gorse Hill Caravans Limited | Hospitality | 1960 |
| Gorse Hill Holdings North Wales Ltd | Financial services | 2001 |
| Guitar Warehouse Ltd | Wholesale & retail | 2022 |
| Gwel Y Tywyn Management Company Limited | Households | 2020 |
| Gwesty TY Gwyn Ltd | Hospitality | 2024 |
| Hamon Design Limited | Professional & scientific | 2006 |
| Happy Shrimp Ltd | Professional & scientific | 2019 |
| Haymax Limited | Manufacturing | 2004 |
| Hearing + Wellness Ltd | Wholesale & retail | 2021 |
| Heating & Electrical Needs Ltd | Administrative & support | 2020 |
| Hhfc Limited | Professional & scientific | 2023 |
| Hidden Key Escape Ltd | Hospitality | 2026 |
| Holby Ltd | Hospitality | 2025 |
| Homestead Consultancy Services (Cymru) Limited | Professional & scientific | 2017 |
| HR & Change Management Ltd | Professional & scientific | 2008 |
| Hufco (Properties) Limited | Construction | 1978 |
| Hugo Matcham Health Limited | Health & social care | 2017 |
| Humberstone Health Limited | Health & social care | 2014 |
| Humphrys Dawson Ltd | Professional & scientific | 2023 |
| I S M Heating Services Limited | Construction | 2016 |
| Idxlogistics(Wales) Ltd | Transport & logistics | 2025 |
| Impact Driver Performance Limited | Arts & recreation | 2016 |
| Inner Spark Hypnotherapy Ltd | Health & social care | 2020 |
| Inox Process Flow Limited | Professional & scientific | 2025 |
| Integrated Building Engineering Services Ltd | Professional & scientific | 2004 |
| Interviron Limited | Wholesale & retail | 1978 |
| Investment NW Ltd | Construction | 2025 |
| IT Technical Solution Consultants Ltd | Information & communication | 2019 |
| J W Hughes & Co LLP | | 2014 |
| Jace Highways Engineering and Planning Solutions Ltd | Professional & scientific | 2024 |
| Jackson Accountants Ltd | Professional & scientific | 2013 |
| Jacy Living Management Ltd | Hospitality | 2026 |
| JAI YEN Designs Ltd | Wholesale & retail | 2026 |
| James Payne (Llandudno) Limited | Wholesale & retail | 1985 |
| Jeniferoma Limited | Manufacturing | 2025 |
| Jesse Williams & SON (Builders) Limited | Construction | 2002 |
| John Colin Ltd | Hospitality | 2025 |
| John Naish Limited | Professional & scientific | 2012 |
| JP Engineering Metal Works Limited | Manufacturing | 2014 |
| Judson Timber Limited | Agriculture & fishing | 1997 |
| Juncyard C.I.C. | Arts & recreation | 2024 |
| K S Painting & Decorating (NW) Limited | Construction | 2025 |
| K W Spencer Ltd | Transport & logistics | 2006 |
| K90 Investments Ltd | Real estate | 2017 |
| K90 Living Ltd | Professional & scientific | 2017 |
| Kalpa Bhadra Buddhist Centre | Other services | 1995 |
| Kara Barbers Shop Conwy Ltd | Other services | 2024 |
| KCR Management Limited | Real estate | 2022 |
| Kingdom Marketing Group Ltd | Wholesale & retail | 2021 |
| Kingfisher Trading (UK) Limited | Extraterritorial | 1993 |
| Kirkham Close 1967 Limited | Extraterritorial | 2014 |
| KMI Properties Ltd | Real estate | 2008 |
| Kratos Protection Services Ltd | Administrative & support | 2014 |
| Kurdistan Barber Shop Ltd | Other services | 2024 |
| Kyle James Plumbing Heating and Renewables Limited | Construction | 2026 |
| Kynaston Place Management Company Limited | Households | 2019 |
| Laurette Kelly Ltd | Health & social care | 2024 |
| Lava Kitchen Ltd | Hospitality | 2025 |
| LDP Project Services Ltd | Professional & scientific | 2026 |
| Leaf Health Plus Limited | Wholesale & retail | 1998 |
| Leighs Property Services (North West) Ltd | Construction | 2019 |
| Lemon Tree Trading Ltd | Manufacturing | 2010 |
| Levantas Energy Ltd | Construction | 2026 |
| Lewis Holdings (Conwy) Ltd | Real estate | 2023 |
| Life Enhancement and Fitness Limited | Wholesale & retail | 1998 |
| Lifetime Financial Advisers Ltd. | Financial services | 2003 |
| Lime Leasing Limited | Wholesale & retail | 2017 |
| Littlefield Caravans Limited | Hospitality | 2018 |
| LJ Installs Limited | Construction | 2022 |
| Llawen Companionship Ltd | Health & social care | 2023 |
| Llys Y Berllan Management Company Limited | Real estate | 2008 |
| Lockeepr Ltd | Information & communication | 2016 |
| Luther & Co Ltd | Wholesale & retail | 2012 |
| Luwa Label Ltd | Administrative & support | 2025 |
| Made by HIM Limited | Arts & recreation | 2014 |
| Madoc Dental Ltd | Health & social care | 2022 |
| Maes Penrhyn Properties Limited | Real estate | 2016 |
| Malwen Ltd | Wholesale & retail | 2022 |
| Marchland Developments Ltd | Construction | 2017 |