| Ghms Investments Ltd | Real estate | 2026 |
| Ghms Property Holdings Ltd | Real estate | 2026 |
| Gibbon Equipment Hire Limited | Administrative & support | 1980 |
| Gibson & Bond Limited | Wholesale & retail | 2000 |
| Go FLY a Kite Limited | Professional & scientific | 1999 |
| Graphsimple Limited | Arts & recreation | 1992 |
| GS Mechanical Engineering Services Limited | Professional & scientific | 2008 |
| Gwenlecs Electrical Services Ltd | Construction | 2002 |
| Gwent Home Improvements Limited | | 1984 |
| Hartonbridge Properties Limited | Real estate | 1987 |
| Heron House Financial Management Limited | Financial services | 1996 |
| Hi-Tech Home Improvement Systems Limited | | 1987 |
| Highsprint Limited | | 1985 |
| House of Couture Limited | Wholesale & retail | 2026 |
| Ironspray Limited | Manufacturing | 1983 |
| ISB Properties Limited | Real estate | 2018 |
| J & S Engineering (Newport) Limited | Manufacturing | 1990 |
| J. Kong (Computer Consultants) Limited | Administrative & support | 1995 |
| J.R. (1990) Limited | Manufacturing | 1986 |
| Jade Garden (Gwent) Limited | Hospitality | 2023 |
| Jane's Store Limited | Wholesale & retail | 2003 |
| JC Engineering Consultancy Ltd | Professional & scientific | 2013 |
| JJ Fitness Online Coaching Ltd | Health & social care | 2023 |
| JJ Fitness Personal Training Limited | Health & social care | 2024 |
| JNH Hospitality Ltd | Hospitality | 2021 |
| Just Holdings Limited | Manufacturing | 2000 |
| Just Polymer Compounds Limited | Manufacturing | 1987 |
| Just Rollers Limited | Manufacturing | 1970 |
| Just Urethane Limited | Manufacturing | 1987 |
| Just-The-Biz Limited | Information & communication | 1994 |
| K J Fuels Ltd. | Professional & scientific | 2005 |
| K J Minerals Ltd. | Administrative & support | 2005 |
| K J Property Investments Limited | Mining & quarrying | 2002 |
| K.J. Services Limited | Administrative & support | 1980 |
| K.N. Electrical Limited | Wholesale & retail | 1998 |
| Kabel Engineering Limited | Wholesale & retail | 1988 |
| Kerricabs Limited | Transport & logistics | 1976 |
| Kijon Developments Limited | Construction | 2004 |
| Kymin Financial Services Limited | Financial services | 1993 |
| Kymin Group Limited | Financial services | 1995 |
| L.C. Motors Limited | Wholesale & retail | 1987 |
| L.J.Nash Engineering(Newport)Limited | | 1971 |
| Leyton Williams (Haulage) Limited | Transport & logistics | 2003 |
| Liberty Metal Recycling UK Ltd | Manufacturing | 2015 |
| Liberty Steel Property Newport Ltd | Real estate | 2017 |
| Liberty United Industries (Newport) Ltd | Manufacturing | 2023 |
| Lockstand Limited | | 1985 |
| M J Hooper Refurbishments Limited | Construction | 2015 |
| M.C.Rowe (Civil Engineering) Limited | Construction | 1968 |
| Macey Sports Limited | Wholesale & retail | 1996 |
| Macfarr Engineering Company Limited | Manufacturing | 1972 |
| Majorjewel Limited | | 1984 |
| Matte Finish Media Limited | Financial services | 2004 |
| Mayfield Building Contractors Limited | Wholesale & retail | 1990 |
| MDW (Europe) Limited | Transport & logistics | 2002 |
| Meritor Aftermarket UK Limited | Manufacturing | 1907 |
| Meritor Heavy Vehicle Systems (Manufacturing) Limited | Administrative & support | 1967 |
| Meritor Heavy Vehicle Systems Limited | Manufacturing | 1943 |
| Merthyr Borough Recycling Centre Limited | Water & waste | 2004 |
| MGM Construction (Gwent) Ltd | Construction | 2005 |
| Mid-Glamorgan Formwork Limited | | 1982 |
| Miller Research (UK) Ltd | Professional & scientific | 2002 |
| Mipa Carpentry Contractors Limited | Construction | 2003 |
| Modern Installations (Newport) Limited | | 1971 |
| Monmouth Diocesan Board of Finance | Administrative & support | 1998 |
| Monmouth Diocesan Trust(The) | Education | 1922 |
| Morspan Holdings Limited | Agriculture & fishing | 1999 |
| Moulton Scott Properties Limited | Construction | 1983 |
| N Austin & Co Ltd | Wholesale & retail | 2019 |
| Natsnow Limited | Arts & recreation | 1989 |
| Neatwork Limited | | 1991 |
| Neil Hodge & Co Limited | Professional & scientific | 2000 |
| Neil Powell (Butchers) Limited | Wholesale & retail | 1985 |
| Nelson Whaley Limited | Professional & scientific | 2015 |
| Newbridge Construction Limited | Construction | 1961 |
| Newbridge Estates Limited | Construction | 1984 |
| Newport & District Funeral Services Limited | Other services | 1997 |
| Newport Transport Limited | Transport & logistics | 1986 |
| Nick Lane Building & Bricklaying Contractors Limited | Construction | 2004 |
| NP15 Investments Limited | Construction | 2003 |
| NTS MUZ Ltd | Transport & logistics | 2025 |
| Omega Building Contractors Limited | Wholesale & retail | 2004 |
| Oxley Accountants Limited | Professional & scientific | 2001 |
| P H J Mitchem Associates Limited | Financial services | 2003 |
| P.H. Transport (Newport, Gwent) Limited | Information & communication | 1991 |
| Paradigm Change Solutions Ltd | Professional & scientific | 2012 |
| Parc Electronics Limited | | 1981 |
| Parklands Leisure Services Ltd | Extraterritorial | 2007 |
| Patchwork GPS Limited | Information & communication | 1998 |
| Pathfinder Publications Limited | Information & communication | 2005 |
| PB Traffic Safety Limited | Professional & scientific | 2005 |
| Phillips Opticians Ltd | Health & social care | 2002 |
| Planewear Limited | | 1984 |
| Poetlynn Limited | | 1982 |
| Precision Engineering Limited | Manufacturing | 1959 |
| Precision Manufacturing Solutions Limited | Professional & scientific | 2006 |
| Premier P.S.C. Limited | | 2003 |
| Premiership Town & Country Developments Limited | Construction | 2005 |
| Priority Industrial Supplies Ltd | Wholesale & retail | 2014 |
| Pritchard Construction & Groundworks Limited | Construction | 2015 |