| Precision Tooling and Castings Limited | Financial services | 2019 |
| Precision Tooling and Castings Trustees Limited | Professional & scientific | 2025 |
| Precision Tooling Services Limited | Manufacturing | 1985 |
| Prescott Engineering Limited | Professional & scientific | 2000 |
| Prestwick Airport Infrastructure Limited | Real estate | 2008 |
| Prestwick Airport Limited | Real estate | 1991 |
| Prestwick Aviation Holdings Limited | Financial services | 1991 |
| Prestwick Cross Ltd | Hospitality | 2019 |
| Prestwick DRY Cleaners Ltd | Other services | 2025 |
| Prestwick Flight Support Limited | Administrative & support | 2006 |
| Prestwick Flying Club Limited | Arts & recreation | 1980 |
| Prestwick Inns Ltd | Hospitality | 2014 |
| Prestwick Kebab and Curry Ltd. | Hospitality | 2014 |
| Prestwick Traders Ltd | Wholesale & retail | 2023 |
| Pro Lawn Limited | Administrative & support | 2002 |
| Probio Energy International Limited | Water & waste | 2016 |
| Proj-Ekts Design + Engineering Limited | Administrative & support | 2007 |
| Project Panel Solutions Ltd | Manufacturing | 2014 |
| Proteam Services Ltd | Administrative & support | 2019 |
| PWR Developments (Scotland) Ltd | Construction | 2023 |
| PWR Developments Ayrshire Limited | Construction | 2023 |
| PWR Electrical Services Limited | Construction | 2013 |
| Q & L Skip Hire Ltd | Water & waste | 2017 |
| QA Lean Consulting Limited | Professional & scientific | 2015 |
| Qaccounting Holdings Limited | Administrative & support | 2010 |
| QBIT3D Ltd | Administrative & support | 2006 |
| Quantum Aviation Limited | Professional & scientific | 2013 |
| Quantum Maritime Aviation Services Ltd | Professional & scientific | 2020 |
| R & V Farriers Ltd | Other services | 2013 |
| R and V Clinics Ltd | Other services | 2016 |
| R&M Food Services Ltd | Hospitality | 2025 |
| R. & S. Sillars Limited | Wholesale & retail | 2004 |
| R.I Dempster Ltd | Wholesale & retail | 2021 |
| Radplas (1997) Limited | Real estate | 1984 |
| Raes Auto Services Ltd | Wholesale & retail | 2013 |
| Rainbow Glass (East) Ltd | Construction | 2025 |
| Rainbow Glass (West) Ltd | Manufacturing | 2003 |
| Rainbow Glass Studios Ltd | Construction | 2025 |
| Rainbow Services (UK) Limited | Health & social care | 2009 |
| Rathdaire Ltd | Administrative & support | 2013 |
| RCM Subsea Limited | Administrative & support | 2006 |
| RDO Safety Design Ltd | Administrative & support | 2012 |
| Rebecca (Holdings) Ltd | Financial services | 2014 |
| Refocus Digital Limited | Information & communication | 2007 |
| Regency Cleaning and Maintenance Limited | Financial services | 2009 |
| Regency FM Services Ltd | Other services | 2013 |
| REM Commercial Property Limited | Real estate | 2022 |
| Remcc Ltd | Administrative & support | 2005 |
| Rentolease Property Management Ltd | Real estate | 2016 |
| Renwick Safety Consulting Limited | Professional & scientific | 2011 |
| Resurge Africa | Health & social care | 2011 |
| Retirement Wise Limited | Professional & scientific | 2020 |
| Retract UK Ltd | Other services | 2024 |
| Revelation Geology Limited | Administrative & support | 2006 |
| Rewire Ayrshire Ltd | Construction | 2025 |
| RG Regenerations Ltd | Construction | 2020 |
| RG Service Repair Ltd | Wholesale & retail | 2018 |
| Rhinsdale LIC Limited | Financial services | 2024 |
| Rhinsdale Limited | Real estate | 2024 |
| Rhrm Limited | Extraterritorial | 2023 |
| Richard Healey Removals Limited | Other services | 2004 |
| RIG UP Ltd | Administrative & support | 2018 |
| Right Options Partners Ltd | Education | 2021 |
| Rigplan Services Ltd | Real estate | 2003 |
| Risk Memory Ltd | Administrative & support | 2021 |
| Rizzo Films Ltd | Professional & scientific | 2022 |
| Rjsd Property Limited | Construction | 2016 |
| RK Engineering Consultancy Limited | Information & communication | 2022 |
| RKC Design Consultants Limited | Administrative & support | 2001 |
| Robert J Hart & Company Limited | Professional & scientific | 1995 |
| Romanacci Ltd | Hospitality | 2021 |
| Roots and Bounty Ltd | Hospitality | 2025 |
| Ross Properties (AYR) Limited | Real estate | 2017 |
| Rozelle Design Limited | Professional & scientific | 2022 |
| RPH Solutions Limited | Manufacturing | 2023 |
| Rugas Ltd | Health & social care | 2016 |
| Rural Pubco ( Irvine) Ltd | Hospitality | 2025 |
| Rural Pubco (Prestwick) Ltd | Hospitality | 2023 |
| Russell Resources Limited | Administrative & support | 2001 |
| S & C Hubs Limited | | 2024 |
| S & J Property Solutions Ltd | Real estate | 2019 |
| S C Commerce Limited | Other services | 2006 |
| S C Scaffolding & Access Solutions Ltd | Construction | 2022 |
| S Y Design Limited | Administrative & support | 2001 |
| S.Day OIL & GAS Operations Ltd | Administrative & support | 2008 |
| SA Golf Sales Limited | Wholesale & retail | 2025 |
| Saddle UP Ltd. | Wholesale & retail | 2005 |
| Safeguard (Scotland) Limited | Professional & scientific | 2024 |
| Salorch Engineering & Management Ltd. | Administrative & support | 2006 |
| Samadhi W Ltd | Health & social care | 2025 |
| Sandy Cloud Limited | Information & communication | 2015 |
| Santiago Marlin Limited | Professional & scientific | 2015 |
| SAS Instrumentation Limited | Administrative & support | 2012 |
| SAY NO More Ltd | Professional & scientific | 2026 |
| Scotia Engineering and Consultancy Services Limited | Professional & scientific | 2016 |
| Scotia Projects Limited | Administrative & support | 2006 |
| Scotspace Ltd | Transport & logistics | 2020 |
| Scott Prime Energy Limited | Financial services | 2026 |
| Scottish Care | Other services | 2003 |
| Scottwind Renewables Ltd | Manufacturing | 2024 |