| Fusion Utility Group Limited | Financial services | 2024 |
| G Force Training, Sales and Hire Ltd | Administrative & support | 2021 |
| G&S Heating Services Limited | Construction | 2014 |
| G.C. Components Limited | Other services | 1997 |
| Gabitiling Limited | Construction | 2025 |
| Gamewales CIC | Other services | 2024 |
| Geetha Enterprises Limited | Wholesale & retail | 2019 |
| Global MSC Security Ltd | Administrative & support | 2003 |
| GMI Electrical Limited | Construction | 2021 |
| GMI Holdings (South Wales) Limited | Financial services | 2025 |
| GMI Property Investments Limited | Real estate | 2024 |
| Good Friend Ltd | Hospitality | 2026 |
| GR Tree Services Limited | Agriculture & fishing | 2023 |
| Green Light Scaffolding Ltd | Construction | 2024 |
| Greenstreets Greengrocers Ltd | Wholesale & retail | 2024 |
| GRH Property Services Ltd | Construction | 2026 |
| Griffithscarpentryco. Ltd | Manufacturing | 2025 |
| Growtrack Systems Ltd | Information & communication | 2025 |
| Grzesica Properties & Developments Limited | Real estate | 2024 |
| Gymstash Ltd | Wholesale & retail | 2023 |
| H Factor Datblygiadau CYF | Construction | 2021 |
| Hampton Pest Management Ltd | Agriculture & fishing | 2024 |
| Happy Bees Day Nursery Limited | Health & social care | 2024 |
| Hawthorne Homes Limited | Construction | 2012 |
| Hawthorne Tree Services Limited | Administrative & support | 2018 |
| Hello Good PIE Ltd | Hospitality | 2019 |
| Heol Fawr Management Company Limited | Hospitality | 1997 |
| HFI Properties Ltd | Real estate | 2026 |
| HIP Properties Ltd | Real estate | 2024 |
| Hire the Knot Ltd | Administrative & support | 2020 |
| HLC & DC Holdings Limited | Professional & scientific | 2012 |
| Hodge OIL Limited | Water & waste | 2019 |
| Hot WOK FOX Limited | Hospitality | 2026 |
| Howell Bray Limited | Other services | 2008 |
| Human Touch Personalised Funerals Ltd | Other services | 2020 |
| Impact Consultancy Services Limited | Professional & scientific | 2019 |
| IN and OUT Trees Ltd | Agriculture & fishing | 2021 |
| Indata Ltd | Information & communication | 2004 |
| Indhu Party Service Ltd | Hospitality | 2018 |
| Inhabit Property Services Limited | Hospitality | 2018 |
| Inkflow CRM Ltd | Information & communication | 2026 |
| Integrity Sourced Ltd | Real estate | 2020 |
| It's a Breese Carpentry Limited | Construction | 2025 |
| Jabymason Tech Limited | Information & communication | 2022 |
| Jeannelucia Ltd | Real estate | 2025 |
| Jefferies Maintenance Ltd | Construction | 2019 |
| JJ Wealth Management Ltd | Financial services | 2017 |
| JJD Properties(Uk) Ltd | Real estate | 2024 |
| JK Properties and Development Limited | Real estate | 2022 |
| JMA Maintenance Ltd | Construction | 2025 |
| JMK Tiling Limited | Construction | 2023 |
| John Davies & Sons Funeral Directors Limited | Other services | 1994 |
| Jojo's Home Ltd | Real estate | 2025 |
| Jojo’S Kitchen Ltd | Hospitality | 2025 |
| JOS Finserv Ltd | Wholesale & retail | 2022 |
| JRD Investments Limited | Real estate | 1996 |
| JT Electrical Services (SW) Ltd | Construction | 2025 |
| K & S Valley Removals Ltd | Transport & logistics | 2017 |
| KEA Commercial Services Ltd | Professional & scientific | 2020 |
| Kebab House Nelson Ltd | Hospitality | 2025 |
| Keystone Commercial Builds Ltd | Construction | 2025 |
| KFJ Hair Limited | Education | 2025 |
| KFJ Studios Limited | Other services | 2024 |
| KJP Housing Ltd | Real estate | 2023 |
| Kristian K Aesthetics Limited | Health & social care | 2022 |
| Ktuk Ltd | Wholesale & retail | 2021 |
| L M Hydraulic Services Limited | Manufacturing | 2026 |
| Laurie Davies Psychology Ltd | Education | 2024 |
| Lhpa Limited | Construction | 2018 |
| Lous LM Cleaning Services Ltd | Administrative & support | 2023 |
| Luke Williams Building and Carpentry Limited | Manufacturing | 2025 |
| M Thomas & SON Construction Limited | Construction | 2023 |
| M W Contracting Carpentry Services Limited | Construction | 2012 |
| M&H Property Ventures Ltd | Real estate | 2025 |
| MAC Property Assets Ltd | Real estate | 2017 |
| Maple Leaf Carpentry Ltd | Construction | 2025 |
| Marks Construction & Rail Services Limited | Construction | 2023 |
| Marv Advice Limited | Professional & scientific | 2021 |
| Marv Crafts Limited | Wholesale & retail | 2023 |
| MBL Mortgages Ltd | Financial services | 2022 |
| Mcvincent Ltd | Professional & scientific | 2011 |
| Meet US in Bloom Limited | Manufacturing | 2024 |
| MEI Tomos CYF | Manufacturing | 2012 |
| Mervin Assets Limited | Real estate | 2021 |
| MG Equine Limited | Agriculture & fishing | 2025 |
| Michael Wileman Kitchens Ltd | Manufacturing | 2026 |
| Moruzzi (UK) Limited | Transport & logistics | 2013 |
| MPS Maintenance Services Ltd | Construction | 2022 |
| Mrag Comms Ltd | Information & communication | 2022 |
| Mrjjones Ltd | Professional & scientific | 2024 |
| MSG Property Services Ltd | Real estate | 2023 |
| Mussal Properties Limited | Real estate | 2023 |
| MW GB26 Ltd | Hospitality | 2025 |
| My Boiler Breakdown Ltd | Construction | 2025 |
| My Prompt Ltd | Education | 2020 |
| Nant Consultancy Limited | Professional & scientific | 2018 |
| Nelson Equine & Livestock Supplies Ltd | Agriculture & fishing | 2025 |
| Nelson Newsagents Limited | Wholesale & retail | 2012 |
| Nelson RFC Limited | Arts & recreation | 2017 |
| Newcare Recruitment Limited | Administrative & support | 2025 |