| Pillar Governance Advisory Ltd | Professional & scientific | 2026 |
| Pipe Access Ltd | Construction | 2017 |
| Pipe Design Solutions Ltd | Professional & scientific | 2022 |
| Pitchers (North West) Ltd | Hospitality | 2020 |
| Pizza House Limavedy Limited | Hospitality | 2023 |
| Pjbb Services Ltd | Other services | 2024 |
| Pjoh Ltd | Financial services | 2023 |
| Plantation Shutters Ireland Ltd | Construction | 2022 |
| Pmcg Properties (NI) Ltd | Real estate | 2014 |
| PMD Car & Commercials Limited | Wholesale & retail | 2019 |
| PML Plumbing & Heating Limited | Construction | 2020 |
| PNK Orthopaedics Limited | Health & social care | 2025 |
| Polar Icetech UK Ltd | Administrative & support | 2025 |
| Poplar Design Limited | Wholesale & retail | 2012 |
| Porthall Enterprises Limited | Construction | 2019 |
| Portlock Properties Limited | Households | 2008 |
| Power 2 Business Ltd | Professional & scientific | 2011 |
| Precision General Surgery Ltd | Health & social care | 2022 |
| Premiair Refrigeration & Air Conditioning Limited | Energy | 2005 |
| Premier Construction Contracts (UK) Limited | Construction | 2024 |
| Premier Consultancy Ltd | Construction | 2016 |
| Premier Fireproofing (UK) Limited | Construction | 2019 |
| Preppedbywardy Limited | Arts & recreation | 2021 |
| Pro Event Medical Services (Pems) Ltd | Health & social care | 2018 |
| Proctor Construction (Procon NI) Limited | Construction | 2019 |
| Project Plug Limited | Energy | 2014 |
| Project Talbot Ltd | Construction | 2006 |
| Province Remedial Specialists Ltd | Construction | 2015 |
| Prucklish Developments Limited | Real estate | 2024 |
| PSD Construction Limited | Construction | 2016 |
| Psrkbm Electrical Ltd | Professional & scientific | 2014 |
| Ptdf Limited | Health & social care | 2020 |
| PTM Capital Ltd | Financial services | 2016 |
| Public Politic Communications Ltd | Professional & scientific | 2017 |
| Puffin Rock Limited | Information & communication | 2013 |
| Pureair Ventilation Ltd | Energy | 2021 |
| PWP Complete Services Ltd | Manufacturing | 2017 |
| Quantum VPN Ltd | Information & communication | 2026 |
| Quay-Pharm Ltd | Wholesale & retail | 2005 |
| Quayside Dental and Implant Centre Ltd | Health & social care | 2011 |
| Quayside Interiors Ltd | Wholesale & retail | 2019 |
| Quaywest Hospitality Limited | Hospitality | 2022 |
| Queens Court Management Services Company Limited | Extraterritorial | 1999 |
| Quinnspares (N.I.) Limited | Wholesale & retail | 1988 |
| R & M Machinery Ltd | Wholesale & retail | 2019 |
| R Metals Limited | Water & waste | 2019 |
| R. & H. Hall Limited | | 1933 |
| R. Duffy Plant Hire NI Ltd | Administrative & support | 2024 |
| R9 TAN Ltd | Administrative & support | 2023 |
| Rafferty Roof Trusses Ltd | Construction | 2004 |
| Rags Property Services Limited | Real estate | 2004 |
| Rain Promotions Limited | Arts & recreation | 2011 |
| Rainbow Child and Family Centre Ltd | Education | 1999 |
| Raksys Group Limited | Real estate | 2023 |
| Rathderry Limited | Professional & scientific | 2010 |
| RAW Nerve Productions Limited | Information & communication | 1995 |
| Rcclr Ltd | Real estate | 2018 |
| Red Barrel Street Food Ltd | Hospitality | 2023 |
| Reddins Coach Hire Limited | Transport & logistics | 2018 |
| Regent Street Projects Ltd | Real estate | 2019 |
| Regional Foods UK Limited | Wholesale & retail | 2018 |
| Reilly Motors Ltd | Wholesale & retail | 2005 |
| Reml Solutions Ltd | Construction | 2023 |
| Rent a Space Campsie Ltd | Real estate | 2021 |
| Revive Plus Supplements Ltd | Wholesale & retail | 2026 |
| River Faughan Anglers Limited-The | Agriculture & fishing | 1995 |
| River Foyle Properties Limited | Real estate | 2021 |
| River House Properties Limited | Real estate | 2013 |
| Rivereo Technologies Limited | Information & communication | 2006 |
| Riverine Business Park Limited | Other services | 2014 |
| Riverview Builders Ltd | Construction | 2026 |
| Riverview Developments (NI) Limited | Real estate | 1999 |
| RLW (N.I) Ltd | Real estate | 2023 |
| RNR Small Limited | Health & social care | 2022 |
| Robson Irish Holdings Limited | Real estate | 2020 |
| Roc's Contracts Ltd | Construction | 2020 |
| Rock Shelving Services LLP | | 2019 |
| Rockhold Protect Ltd | Wholesale & retail | 2022 |
| ROD DOR Studio Ltd | Wholesale & retail | 2023 |
| Rolling Hills Construction Ltd | Construction | 2022 |
| Roslea Management Ltd | Households | 2025 |
| RRM & Co Law Ltd | Professional & scientific | 2010 |
| RUA Contracts Limited | Financial services | 2024 |
| Rubicon Innovation Limited | Professional & scientific | 2021 |
| Ruckus Kitchen Ltd | Hospitality | 2025 |
| Ryan Mackey Safety Consultants Limited | Professional & scientific | 2024 |
| S Mcclafferty Construction Ltd | Construction | 2015 |
| S48 Ltd | Wholesale & retail | 2023 |
| Safe Harbour Security Ltd | Information & communication | 2020 |
| Safety Professionals Limited | Administrative & support | 2006 |
| Sanctuary Clinic Services Ltd | Real estate | 2019 |
| SB Arch Ltd | Professional & scientific | 2018 |
| SBR Tuning Limited | Wholesale & retail | 2019 |
| Scafftex (NI) Limited | Construction | 2002 |
| Scarpello NI Limited | Hospitality | 2019 |
| School of Confidence Limited | Education | 2015 |
| Scott Property Holdings Limited | Real estate | 2017 |
| Scott Service Engineers Ltd | Mining & quarrying | 2012 |
| SCS Plastering Limited | Construction | 2024 |
| Sean Hughes Ltd | Hospitality | 2022 |