| Northern Lily Community Interest Company | Agriculture & fishing | 2021 |
| Northern Living Ltd | Real estate | 2026 |
| Northern Nutrition Ltd | Manufacturing | 2000 |
| Northern Platinum Management Ltd | Real estate | 2025 |
| Northern Soul Recruitment Ltd | Administrative & support | 2026 |
| Northern Stage Awards Ltd | Arts & recreation | 2025 |
| Northern Tool Hire Limited | Administrative & support | 2001 |
| Northwest Drinks Ltd | Wholesale & retail | 2013 |
| Northwest Joinery Coatings Limited | Construction | 2013 |
| Northwest Supply Ltd | Wholesale & retail | 2025 |
| Novark Consulting Ltd | Information & communication | 2026 |
| Novel Design & Property Ltd | Professional & scientific | 2016 |
| Nsqh Limited | Financial services | 2019 |
| Numan Psychological Therapies Ltd | Health & social care | 2024 |
| Nutrifits Inc Ltd | Manufacturing | 2023 |
| Nutswood Limited | Wholesale & retail | 2023 |
| NW Autos Parts Limited | Wholesale & retail | 2024 |
| NW Commercial Cleaners Limited | Administrative & support | 2022 |
| Nweg Properties Ltd | Construction | 2024 |
| O Brasileirão Restaurant and Shop Manchester Ltd | Wholesale & retail | 2026 |
| O'Donnell's Electrical Contracting Limited | Construction | 2018 |
| Oakbright Education Ltd | Extraterritorial | 2024 |
| Oakmere Kitchens & Interiors Ltd | Professional & scientific | 2026 |
| OBD Hire Limited | Administrative & support | 2015 |
| Occasionz Hire Ltd | Hospitality | 2025 |
| Ocean Genesis Limited | Wholesale & retail | 2019 |
| Ocean MIX UK Limited | Wholesale & retail | 2024 |
| Ocean Palace Manchester Ltd | Hospitality | 2025 |
| Oceansage Therapy Ltd | Health & social care | 2026 |
| Odyssey Group Ltd | Health & social care | 2023 |
| Ofbad Resources Limited | Public administration | 2018 |
| OJ Spotless Cleaning Ltd | Administrative & support | 2025 |
| OK Pizza Ltd | Hospitality | 2026 |
| OL6 Hand Car Wash Limited | Wholesale & retail | 2026 |
| OL6 Local Store Limited | Wholesale & retail | 2026 |
| OL7 Local Store Limited | Wholesale & retail | 2026 |
| Old Street Ashton Under Lyne Ltd | Households | 2023 |
| Old-Wood Central Ltd | Construction | 2020 |
| Olden Days Limited | Wholesale & retail | 2023 |
| Oldham Flooring Ltd | Wholesale & retail | 2020 |
| Oldham Healthcare Limited | Wholesale & retail | 2023 |
| Oldham Sports Coaching Limited | Education | 2026 |
| Olibats Limited | Real estate | 2003 |
| OLK Manchester Ltd | Hospitality | 2025 |
| Ollie Walmsley Golf Ltd | Administrative & support | 2023 |
| Olusola Fashion House Ltd | Manufacturing | 2026 |
| Olxshop EA Ltd | Wholesale & retail | 2025 |
| OM SAI RAM Ltd | Wholesale & retail | 2023 |
| OM SAI VRK Ltd | Real estate | 2022 |
| Omanfi Ltd | Wholesale & retail | 2023 |
| Omni Buy Ltd | Wholesale & retail | 2026 |
| OMU Food Ltd | Hospitality | 2026 |
| ON Level Ltd | Manufacturing | 2016 |
| ON Point Cars MCR Ltd | Transport & logistics | 2020 |
| ON Trend Kitchens Limited | Construction | 2024 |
| Once Upon a Time Photography (MCR) Ltd | Professional & scientific | 2025 |
| Ondis Solutions Limited | Administrative & support | 2016 |
| One Aesthetic and Beauty Lounge Ltd | Health & social care | 2025 |
| One Love Kitchen Ashton Ltd | Hospitality | 2025 |
| Online Makeup Academy Ltd | Education | 2024 |
| Onmove Properties Ltd | Real estate | 2024 |
| Onsite Exhibitions Ltd | Other services | 2021 |
| Opaque Trading Limited | Wholesale & retail | 2018 |
| Origin Spain Ltd | Wholesale & retail | 2020 |
| Originate Code Ltd | Information & communication | 2025 |
| Oris' Grill Ltd | Hospitality | 2024 |
| ORJ Properties Limited | Real estate | 2016 |
| Ornamental Plaster Design Limited | Construction | 1986 |
| Ornella's Kitchen Ltd | Hospitality | 2022 |
| Orrp Property Ltd | Real estate | 2026 |
| OSG Performance 2026 Ltd | Arts & recreation | 2026 |
| Osman M Consulting Ltd | Information & communication | 2022 |
| Outfitz Limited | Wholesale & retail | 2018 |
| OVO Tech (NW) Ltd | Information & communication | 2022 |
| P & R Mistry Limited | Professional & scientific | 2010 |
| P Brooks Properties Ltd | Real estate | 2020 |
| P D Pipes Limited | Construction | 2018 |
| P&C Group Ltd | Professional & scientific | 2026 |
| P-Tai Limited | Information & communication | 2019 |
| P.T.A Consultants Ltd | Professional & scientific | 2024 |
| Pace Casing Logistics Ltd | Extraterritorial | 2021 |
| Pace Casings Ltd | Extraterritorial | 2021 |
| Pace Tyre Logistics Ltd | Transport & logistics | 2021 |
| Pace Tyre Ltd | Extraterritorial | 2021 |
| Padawill Limited | Arts & recreation | 2019 |
| Padmawati Healthcare Ltd | Health & social care | 2025 |
| PAE Solutions Ltd | Real estate | 2016 |
| Page Partners U.K. Limited | Professional & scientific | 2011 |
| Paid Work Ltd. | Administrative & support | 2016 |
| Pain&Gain Gym Ltd | Wholesale & retail | 2024 |
| Paks Properties Ltd | Real estate | 2026 |
| Palatine Contracts Limited | Construction | 2000 |
| Pallets & Pallets Ltd | Manufacturing | 2025 |
| Panj Bara PVT Ltd | Information & communication | 2021 |
| Panther Cars Ltd | Wholesale & retail | 2026 |
| Paramount Estates Ltd | Real estate | 2012 |
| Parking Solutions 24 Ltd | Other services | 2011 |
| Parkside Motors Northwest Ltd | Wholesale & retail | 2022 |
| Parmar Optical Ltd | Health & social care | 2024 |
| Partyathome Ltd | Hospitality | 2023 |