| Northam Engineering and Land Survey Limited | Professional & scientific | 2012 |
| Northone Marketing Ltd | Professional & scientific | 2025 |
| Northshore Property Solutions Ltd | Real estate | 2026 |
| Northstone Interiors Ltd | Construction | 2026 |
| NOT the Torph Ltd | Hospitality | 2019 |
| Nova Maven Ltd | Hospitality | 2025 |
| Novaniche Solutions Ltd | Wholesale & retail | 2026 |
| Novara Commercial Ltd | Construction | 2026 |
| Novasphere Limited | Real estate | 2023 |
| Novatrade Distribution Ltd | Wholesale & retail | 2025 |
| Nownow Cafe Limited | Wholesale & retail | 2015 |
| Nownow Swirls Limited | Manufacturing | 2026 |
| NRG Technical Services Limited | Professional & scientific | 2010 |
| Nrg-Fm Limited | Construction | 2010 |
| NRS Fortune Limited | Real estate | 2024 |
| NS Residential Ltd | Real estate | 2026 |
| Nscr Ltd | Wholesale & retail | 2017 |
| NU Moves Dance Studios Ltd | Education | 2016 |
| Nu-Phalt Contracting Limited | Construction | 2006 |
| Nu-Phalt Group Limited | Professional & scientific | 2007 |
| Nuergy Ltd. | Other services | 2016 |
| Nursery Times at the Park Limited | Education | 2002 |
| Nursery Times by the River Limited | Education | 2009 |
| Nutrilyfe Ltd | Wholesale & retail | 2024 |
| Nuts About Seeds Ltd | Wholesale & retail | 2025 |
| NVD Livi Ltd | Transport & logistics | 2022 |
| O'Paul Construction Company Limited | Construction | 2022 |
| O'Paul Healthcare Services Limited | Health & social care | 2022 |
| Oakridge Installations Ltd | Construction | 2026 |
| Oasis Scotland Ltd | Transport & logistics | 2004 |
| Obrien Auto Diagnostics Ltd | Wholesale & retail | 2025 |
| October Moon Studio Ltd | Wholesale & retail | 2024 |
| Odacity Limited | Wholesale & retail | 2025 |
| Offmon Limited | Information & communication | 2025 |
| Ojastech Ltd | Information & communication | 2026 |
| Oldfield Couriers Ltd | Transport & logistics | 2026 |
| OM Estates & Investments Limited | Real estate | 2024 |
| OM PAR Limited | Real estate | 2014 |
| One 4 ALL Solutions Ltd | Construction | 2026 |
| One Design Electrical Ltd | Energy | 2021 |
| One Livingston Ltd | Education | 2025 |
| One Mind Martial Arts Academy Ltd | Arts & recreation | 2016 |
| Oneoff Apparel Ltd | Wholesale & retail | 2019 |
| Onesoltech Ltd | Information & communication | 2021 |
| Onevo Group Ltd | Financial services | 2025 |
| Online Defense Bureau Ltd | Information & communication | 2025 |
| Online Globe Ltd | Wholesale & retail | 2025 |
| Online Healthcare UK Ltd | Wholesale & retail | 2022 |
| Online Rewards Limited | Information & communication | 2004 |
| Ontrack Logistics Private Limited | Transport & logistics | 2025 |
| Onyx IT Services Limited | Information & communication | 2022 |
| Oogway Consulting Limited | Information & communication | 2017 |
| Open Door Scotland | Health & social care | 2008 |
| Optimal Leisure Limited | Wholesale & retail | 2025 |
| Optimal Safety Auditing Limited | Professional & scientific | 2021 |
| Oral Health & Hygiene Ltd | Health & social care | 2013 |
| Orbis Scientific Limited | Manufacturing | 2015 |
| Orca Talent Solutions Ltd | Administrative & support | 2014 |
| Organlike Limited | Manufacturing | 2017 |
| Origin U.K. Limited | Energy | 2017 |
| Orion Planning Ltd | Professional & scientific | 2012 |
| Ossian Woodland Limited | Professional & scientific | 2011 |
| OTP Engineering Ltd | Construction | 2023 |
| Ourmalt Ltd | Wholesale & retail | 2019 |
| Overshiel Accountancy & Business Advisory Limited | Professional & scientific | 2025 |
| Overshiel Storage Limited | Transport & logistics | 2025 |
| Owambe Kitchen CIC | Hospitality | 2026 |
| Owltek Ltd | Information & communication | 2022 |
| Own Your Own Future Limited | Professional & scientific | 2008 |
| Oxford Exhibition Services Limited | Extraterritorial | 1990 |
| OXYGEN8 Hbot Services Ltd | Other services | 2024 |
| Ozone Gliders Ltd. | Manufacturing | 1998 |
| Ozone Kites Ltd. | Manufacturing | 2001 |
| Ozone Kitesurf Limited | Manufacturing | 2006 |
| Ozone Power Limited | Manufacturing | 2006 |
| P & P Anderson Taxis Ltd. | Professional & scientific | 2000 |
| P & R Letting (Ayrshire) Limited | Real estate | 2002 |
| Padmavathi Technologies Ltd | Information & communication | 2012 |
| PAGE4DESIGNS Limited | Professional & scientific | 2018 |
| Palladium Risk Ltd | Professional & scientific | 2015 |
| Panda Joy Limited | Hospitality | 2026 |
| Pangolin Industries Ltd | Professional & scientific | 2022 |
| Paomia Consulting Ltd | Professional & scientific | 2026 |
| Papillon Take Away Delivery Limited | Hospitality | 2019 |
| Paradise Enclave Properties Ltd | Real estate | 2021 |
| Paramount Care (Aberdeen) Limited | Other services | 2003 |
| Paramount Domestic Services Ltd | Other services | 2008 |
| Parceljet Limited | Transport & logistics | 2025 |
| Park Digital Systems Ltd. | Wholesale & retail | 1999 |
| Parkmore Distillery Company Limited | Extraterritorial | 2013 |
| Parkway Fastfoods Limited | Hospitality | 2026 |
| Parsley and Thyme Catering Limited | Hospitality | 2012 |
| Passion 4 Social CIC | Information & communication | 2018 |
| Passion Fruit Investments Ltd | Real estate | 2024 |
| Paterson Accountancy Limited | Professional & scientific | 2014 |
| Paterson and Parker Limited | Wholesale & retail | 1979 |
| Patersons Business Solutions Ltd | Administrative & support | 2022 |
| Patoco Limited | Health & social care | 2022 |
| Paton Plumbing & Heating Ltd | Construction | 2026 |
| Pava Ltd | Professional & scientific | 2019 |