| Monteith"S Ltd. | Hospitality | 2019 |
| Mooreheat Ltd | Construction | 2012 |
| More MEP Limited | Professional & scientific | 2015 |
| Morton Club Together Ltd | Other services | 2019 |
| MOT Centre (Greenock) Limited | Extraterritorial | 2009 |
| Motospa Ltd | Other services | 2024 |
| Moving on (Inverclyde) | Other services | 2003 |
| MSC Lifting Solutions Ltd | Manufacturing | 2025 |
| MTA Tech Limited | Information & communication | 2026 |
| Mucci Ltd | Other services | 2023 |
| Muhammad Waqas Haider Ltd | Wholesale & retail | 2023 |
| Murray Property Rentals Limited | Real estate | 2025 |
| Must Clothing Limited | Wholesale & retail | 2016 |
| My Health (Scotland) Ltd | Education | 2018 |
| My News (Greenock) Ltd | Wholesale & retail | 2019 |
| N & R Group Ltd | Wholesale & retail | 2023 |
| N Graham Transport Ltd | Transport & logistics | 2025 |
| N&F Consultancy Limited | Other services | 2017 |
| Narms Technical Services Ltd | Professional & scientific | 2021 |
| Narowal Fashion Limited | Wholesale & retail | 2022 |
| NDW Enterprises Ltd | Wholesale & retail | 2024 |
| New Horizons Engineering Ltd | Information & communication | 2012 |
| New Licht Limited | Information & communication | 2020 |
| Newark Civils Ltd | Construction | 2026 |
| Newark Decorators Ltd | Construction | 2021 |
| Newark Enterprises Ltd | Manufacturing | 2014 |
| NEWS4U Limited | Wholesale & retail | 2020 |
| Next GEN Cleaning Services Ltd | Administrative & support | 2022 |
| Next Generation Property Development Ltd | Real estate | 2023 |
| Next Generation Property Partnership LLP | | 2024 |
| NF News Ltd | Wholesale & retail | 2025 |
| Nicecon Limited | Professional & scientific | 1992 |
| Nicola Gallagher Ltd | Health & social care | 2023 |
| Nicolsons Holdings Ltd | Hospitality | 2019 |
| Nish Pharma Ltd | Professional & scientific | 2021 |
| NJQ Ltd | Professional & scientific | 2020 |
| NLP Marine Ltd | Construction | 2024 |
| NO Angels Fashion Ltd | Wholesale & retail | 2022 |
| NO Nonsense Productions CIC | Arts & recreation | 2015 |
| Nomad Essentials Ltd | Wholesale & retail | 2025 |
| Nonlethalexpires Ltd | Hospitality | 2019 |
| Northern Citadel Limited | Real estate | 2021 |
| Northwest Scotland Holiday Lets Ltd | Hospitality | 2019 |
| Novadyne Limited | Professional & scientific | 2004 |
| Nuha Ranya Ltd | Other services | 2025 |
| Nxt-Gen Ballers Coaching Academy Ltd | Education | 2025 |
| O.C.K Takeaway Ltd | Hospitality | 2026 |
| O.C.K's Takeaway Limited | Hospitality | 2025 |
| O3 Home Care Service Ltd | Administrative & support | 2025 |
| Oak Mobiles Limited | Wholesale & retail | 2024 |
| Ocean Engineering Construction Specialists Ltd | Professional & scientific | 2024 |
| Ocean Youth Trust (Scotland) | Transport & logistics | 1999 |
| OCHE180 Limited | Information & communication | 2026 |
| Octavia 1972 Ltd | Real estate | 2019 |
| Off-Road Custom and Classic Vehicles Limited | Manufacturing | 2018 |
| OHS Occupational Health Ltd | Health & social care | 2024 |
| OM Orthopaedics Limited | Health & social care | 2017 |
| One Bruce Street Limited | Hospitality | 2022 |
| ONE2ONE2ONE Limited | Wholesale & retail | 2020 |
| OOH LA LA Limited | Other services | 2023 |
| Optis Interiors Limited | Construction | 2012 |
| Orangefield Dental Care Ltd | Health & social care | 2019 |
| Oswald Construction (Scotland) Limited | Construction | 2025 |
| OUT of Line Ltd | Other services | 2025 |
| Ovens Property Ltd | Real estate | 2025 |
| Ovens Retail Ltd | Wholesale & retail | 2012 |
| P & a Properties (Scotland) Ltd | Financial services | 2025 |
| P & D Assets Limited | Real estate | 2025 |
| Paints & Pixels Ltd | Arts & recreation | 2023 |
| Pampered Pets Limited | Professional & scientific | 2001 |
| Pampered Pets Training UK Limited | Education | 2014 |
| Parker Bros Garage Ltd | Wholesale & retail | 2017 |
| Parkview Studios Ltd | Other services | 2016 |
| Partners That Care Ltd | Administrative & support | 2019 |
| Passion Spas Ltd | Wholesale & retail | 2015 |
| Patj 65 Ltd | Wholesale & retail | 2021 |
| Patrick Bryceland Limited | Real estate | 1983 |
| Patrick Cannie Marine Consulting Limited | Professional & scientific | 2026 |
| Patrick Gatens Electrical Ltd | Professional & scientific | 2014 |
| Patten & Prentice LLP | | 2010 |
| Paul Skilling & SON Plasterers Ltd | Construction | 2021 |
| PAY & Reward Ltd | Professional & scientific | 2018 |
| PCS Repair & Renovation Ltd | Real estate | 2025 |
| PD Marine Outfitting Ltd | Manufacturing | 2020 |
| PDB Property Holdings Limited | Real estate | 2025 |
| Pellesa Beauty and Fashion Sense Ltd | Wholesale & retail | 2025 |
| PH Gosht Ltd | Wholesale & retail | 2026 |
| Picture Your Frame Ltd | Wholesale & retail | 2016 |
| Picturehoose Limited | Hospitality | 2023 |
| Pint of FUN Ltd | Real estate | 2024 |
| Pint of GIN Ltd | Hospitality | 2024 |
| Pint of OPS Ltd | Hospitality | 2025 |
| Pipes & Ropes Services Ltd | Construction | 2023 |
| PIZZA@278 Ltd | Hospitality | 2024 |
| Pizzakitchengreenock Ltd | Hospitality | 2023 |
| Plumbing and Heating on TAP Ltd | Construction | 2020 |
| Plus EV Consulting Ltd | Other services | 2021 |
| PM GAS Services Limited | Construction | 2026 |
| Polassist Limited | Professional & scientific | 2021 |
| Port Property Holdings Limited | Real estate | 2025 |