| ROE Angling Limited | Other services | 2012 |
| ROE ENG Limited | Professional & scientific | 2012 |
| ROE Interiors Limited | Construction | 2016 |
| ROE Park Holdings Limited | Hospitality | 1993 |
| ROE Reformer Ltd | Arts & recreation | 2025 |
| ROE Scaffolding Ltd | Extraterritorial | 2007 |
| ROE Trading Ltd | Wholesale & retail | 2013 |
| ROE Valley Ancestral Researchers Ltd | Agriculture & fishing | 2019 |
| ROE Valley Coffee Ltd | Wholesale & retail | 2025 |
| ROE Valley Combat Club CIC | Education | 2026 |
| ROE Valley Cycles Ltd | Wholesale & retail | 2011 |
| ROE Valley Enterprises Limited | Administrative & support | 1992 |
| ROE Valley Feeds Ltd | Wholesale & retail | 2015 |
| ROE Valley Integrated Primary School Limited | Education | 2009 |
| ROE Valley Pest Control Ltd | Administrative & support | 2023 |
| ROE Valley Rentals Limited | Real estate | 2022 |
| ROE Valley Residents Association | Other services | 2016 |
| ROE Valley Rooms Limited | Hospitality | 2013 |
| ROE Valley Uniforms Limited | Wholesale & retail | 2025 |
| ROE Wood Residents Management Company Limited | Households | 2021 |
| Roecare Ltd | Professional & scientific | 2022 |
| Roehill Properties Limited | Construction | 2015 |
| Ronson Properties Ltd | Real estate | 2013 |
| Rosapenna Holding Ltd | Financial services | 2025 |
| Rosses Gate Development Management Company Ltd | Households | 2023 |
| Rosy Roof Group Ltd | Construction | 2019 |
| Roxborough Electrics Ltd | Wholesale & retail | 2015 |
| RR Barr Limited | Construction | 2021 |
| Rrhp Management Limited | Real estate | 2024 |
| RS 5 Star Security Ltd | Administrative & support | 2019 |
| RS Sandblasting & Painting Ltd | Manufacturing | 2026 |
| Rural Joinery Ltd | Construction | 2023 |
| RVG5 Ltd | Administrative & support | 2018 |
| Ryan Barrett Contracts Ltd | Construction | 2020 |
| Ryan Byrne Ltd | Professional & scientific | 2026 |
| Ryan Moore Construction Ltd | Construction | 2022 |
| Ryan Patrick Ltd | Wholesale & retail | 2015 |
| Ryan Tierney Holdings Ltd | Financial services | 2019 |
| S & R Forgie Limited | Financial services | 2024 |
| S Doherty Builders Ltd | Construction | 2024 |
| S Gallagher Properties Limited | Construction | 2005 |
| S Lamont Contracts Limited | Administrative & support | 2015 |
| S M K Contracts Ltd | Construction | 2015 |
| S&G Lynch Ltd | Wholesale & retail | 2021 |
| Sabenhab Limited | Other services | 2012 |
| Salters Bridge Management Company NO.2 Limited | Households | 2013 |
| Salus Medical Limited | Transport & logistics | 2023 |
| Sampson Green Management Company Ltd | Households | 2021 |
| Sandy Arthur Group Ltd | Extraterritorial | 2011 |
| Sandy Arthur Coach Hire Limited | Transport & logistics | 2011 |
| Sandy Arthur Training Services Limited | Other services | 2005 |
| Sandy Bay Management Company Limited | Real estate | 2015 |
| Sarah Louise Group Limited | Wholesale & retail | 2021 |
| SC Tarmac Ltd | Construction | 2003 |
| Sccrr (NI) Ltd | Administrative & support | 2016 |
| SCD Developments (NI) Ltd | Construction | 2014 |
| SCR Interiors Ltd | Construction | 2020 |
| SCT Fire & Safety Protection Limited | Administrative & support | 2019 |
| Sea Shed Trading Ltd | Wholesale & retail | 2022 |
| Seacoast Homes Ltd | Real estate | 2025 |
| Seacoast Joinery & Construction Ltd | Construction | 2025 |
| Seafield Mews Portstewart Management Limited | Households | 2011 |
| Seafin Investments Limited | Real estate | 2004 |
| Seageo Properties Ltd | Real estate | 2024 |
| Sensible Processing Ltd | Manufacturing | 2014 |
| SG Glass Limited | Construction | 2016 |
| SGD Investments Limited | Financial services | 2024 |
| SGH Drylining Ltd | Construction | 2016 |
| Sharma Securities Ltd | Real estate | 2015 |
| Shed Catering NI Limited | Hospitality | 2023 |
| Shellinghill Mews Management Company Ltd | Extraterritorial | 2014 |
| Shepherds Glen Management Company Limited | Households | 1999 |
| Sherrard (Bros) Sand & Gravel Ltd | Mining & quarrying | 2005 |
| Sherrard Bros Sand & Gravel (NI) Ltd | Construction | 2012 |
| Shopswift Ltd | Wholesale & retail | 2025 |
| Shuttle Hill Pubs Limited | Hospitality | 2017 |
| Sigmac Limited | Professional & scientific | 2009 |
| SIS Hospitality Ltd | Health & social care | 2016 |
| SIX Mile Cross Management Company Ltd | Households | 2023 |
| Sixtowns Road Management Limited | Households | 2006 |
| SJB Management Solutions Ltd | Households | 2013 |
| SK Uniforms & Workwear Ltd | Wholesale & retail | 2025 |
| Slainte Retreat Limited | Arts & recreation | 2018 |
| Slanehill Limited | Real estate | 2011 |
| Sliding Robes Direct Limited | Manufacturing | 2012 |
| Sliding Robes Ltd | Manufacturing | 2016 |
| SM Rentals Limited | Administrative & support | 2021 |
| Smac Utilities Ltd | Construction | 2025 |
| SMG Contracts Ltd | Construction | 2016 |
| Smyth & Ferguson Ltd | Other services | 2021 |
| Smyth Slevoyre Ltd | Wholesale & retail | 2026 |
| Solas BEO Ltd | Hospitality | 2025 |
| Solevantage Ltd | Wholesale & retail | 2025 |
| Sonya Cassidy PR Limited | Professional & scientific | 2019 |
| Specialist Drylining Ltd | Construction | 2026 |
| Spectrum Solutions (North) Ltd | Manufacturing | 2016 |
| Sperrin Bawn Management Company Ltd | Households | 2021 |
| Sperrin Sweeps Ltd | Administrative & support | 2025 |
| Sperrin View Construction Ltd | Construction | 2011 |
| SPP Engineering Ltd | Construction | 2022 |