| Newconn Contract Services Limited | Agriculture & fishing | 2004 |
| Newconn Holdings Limited | Professional & scientific | 2016 |
| Newell Design Limited | Professional & scientific | 2015 |
| Newgents (IOW) Ltd | Administrative & support | 2018 |
| Newmans (IOW) Limited | Hospitality | 2026 |
| NEWPOINT999 Limited | Wholesale & retail | 2017 |
| Newpopadoms Ltd | Hospitality | 2026 |
| Newport & Central PCN Limited | Health & social care | 2022 |
| Newport (IW) Football Club Limited | Arts & recreation | 1997 |
| Newport (IW) Golf Club Limited | Arts & recreation | 2022 |
| Newport (Pembs.) Golf Club Limited | Arts & recreation | 1998 |
| Newport (Salop) Market and Trading Company Limited | Real estate | 1952 |
| Newport (Salop) Rugby Union Football Club Limited | Arts & recreation | 2010 |
| Newport (Shropshire) & District Chamber of Commerce | Other services | 1998 |
| Newport (Shropshire) Cottage Care Centre Trust Limited | Health & social care | 1990 |
| Newport (Shropshire) Sports Limited | Wholesale & retail | 2002 |
| Newport ALE House Ltd | Hospitality | 2018 |
| Newport Anchor Testing Ltd | Construction | 2025 |
| Newport and District Agricultural Society | Other services | 1999 |
| Newport and South Wales Railway Museum Ltd | Other services | 2016 |
| Newport Appliance Services Ltd | Other services | 2004 |
| Newport Association Football Club Limited | Arts & recreation | 1989 |
| Newport Bathroom Centre Ltd | Construction | 2006 |
| Newport Beauty Ltd | Other services | 2019 |
| Newport Boat Club Limited | Arts & recreation | 2023 |
| Newport Builders and Home Improvements Limited | Construction | 2024 |
| Newport Burgers Ltd | Hospitality | 2025 |
| Newport Business Against Crime Ltd | Public administration | 2009 |
| Newport CAB | Other services | 2006 |
| Newport Cafe House Ltd | Hospitality | 2025 |
| Newport Caravans Limited | Administrative & support | 2008 |
| Newport Catering Equipment Ltd | Manufacturing | 2025 |
| Newport Central Jam'E Masjid | Education | 2019 |
| Newport Chiropractic Limited | Other services | 2004 |
| Newport City Aerodrome & Airport Company Limited | Transport & logistics | 2005 |
| Newport City Cleaning Ltd | Administrative & support | 2010 |
| Newport City Cycles Ltd | Arts & recreation | 2012 |
| Newport City FC Limited | Arts & recreation | 2025 |
| Newport City Radio Community Interest Company | Information & communication | 2011 |
| Newport City Vehicle Services Ltd | Administrative & support | 2019 |
| Newport Cladding Limited | Construction | 2025 |
| Newport Commercials (South Wales) Limited | Wholesale & retail | 2017 |
| Newport Commercials Limited | Transport & logistics | 2009 |
| Newport Crash Repair Centre Ltd | Wholesale & retail | 2019 |
| Newport Cues Ltd | Arts & recreation | 2023 |
| Newport Cuisine Limited | Hospitality | 2024 |
| Newport Curry House Ltd | Hospitality | 2023 |
| Newport Denture Clinic Ltd | Manufacturing | 2022 |
| Newport Diving Limited | Arts & recreation | 2012 |
| Newport Dock Boatmen Limited | Transport & logistics | 1999 |
| Newport Electrical Company Limited | Professional & scientific | 2022 |
| Newport Electrical Contractors Limited | Energy | 2008 |
| Newport Electrical Limited | Professional & scientific | 2016 |
| Newport Engineering Merchants Limited | Administrative & support | 2009 |
| Newport EPC Ltd | Professional & scientific | 2021 |
| Newport Events Ltd | Administrative & support | 2026 |
| Newport Flooring Limited | Construction | 2014 |
| Newport Foods Centre Ltd | Hospitality | 2025 |
| Newport Forwarding and Warehousing Limited | Transport & logistics | 1964 |
| Newport Furnishers Limited | Wholesale & retail | 1970 |
| Newport Furnishings Limited | Wholesale & retail | 2025 |
| Newport Gaming Company Ltd | Wholesale & retail | 2020 |
| Newport Garage Services Ltd | Wholesale & retail | 2025 |
| Newport Gate Ltd | Hospitality | 2014 |
| Newport Girls' High School Academy Trust | Education | 2011 |
| Newport Hockey Club | Arts & recreation | 2016 |
| Newport Hotel Ltd | Hospitality | 2009 |
| Newport Hybrid Auto Centre Ltd | Wholesale & retail | 2025 |
| Newport Indoor Bowls and Leisure Limited | Arts & recreation | 2022 |
| Newport Indoor Football Centre Ltd | Arts & recreation | 2017 |
| Newport IT Ltd | Information & communication | 2026 |
| Newport IW Community Football Club Ltd | Arts & recreation | 2026 |
| Newport Leaflets Ltd | Professional & scientific | 2018 |
| Newport Liquor Ltd | Wholesale & retail | 2018 |
| Newport Live | Arts & recreation | 2014 |
| Newport Market Ltd | Real estate | 2026 |
| Newport Masonic Centre Ltd | Hospitality | 2024 |
| Newport Masonic Hall Limited | Hospitality | 1935 |
| Newport Medics Ltd | Health & social care | 2024 |
| Newport Minimarket Limited | Wholesale & retail | 2018 |
| Newport Mobiles Limited | Wholesale & retail | 2018 |
| Newport MOT & Repair Centre Limited | Wholesale & retail | 2008 |
| Newport Motor Services Pembrokeshire Ltd | Wholesale & retail | 2014 |
| Newport Motorcycle Bunker Ltd | Manufacturing | 2010 |
| Newport Nails 26 Limited | Other services | 2024 |
| Newport NOW BID | Other services | 2015 |
| Newport Oriental Garden Chinese Limited | Hospitality | 2022 |
| Newport Pets Ltd | Wholesale & retail | 2018 |
| Newport Popadoms Ltd | Hospitality | 2025 |
| Newport Productions Ltd | Information & communication | 2019 |
| Newport Properties Limited | Real estate | 2025 |
| Newport Recycling Group Limited | Professional & scientific | 2025 |
| Newport Recycling Limited | Water & waste | 1993 |
| Newport Removal Team Ltd | Transport & logistics | 2021 |
| Newport Rendering Specialist Ltd | Construction | 2024 |
| Newport Rowing Club | Arts & recreation | 2021 |
| Newport Rugby Football Club Limited | Arts & recreation | 1998 |
| Newport Saracens RFC Limited | Arts & recreation | 2009 |
| Newport Scaffolding (IW) Ltd | Construction | 2026 |
| Newport SEN BBQ Ltd | Hospitality | 2022 |