| Rock Financial Services Ltd | Financial services | 2016 |
| Rock Freight Ltd | Transport & logistics | 2014 |
| Rock Hire Armagh Ltd | Administrative & support | 2021 |
| Rock Like Funk Ltd | Arts & recreation | 2017 |
| Rock Properties N.I. Limited | Real estate | 2025 |
| Rock Tile Centre Ltd | Wholesale & retail | 2012 |
| Rockridge Investments Limited | Professional & scientific | 2024 |
| Rocks Haulage Ltd | Transport & logistics | 2015 |
| Rockstown Ltd | Information & communication | 2008 |
| Rookford Homes Limited | Real estate | 2016 |
| Rory Thomas (NI) Limited | Transport & logistics | 2020 |
| Rosco Engineering (NI) Limited | Manufacturing | 1999 |
| Rosevel Limited | Wholesale & retail | 2020 |
| Roskeen Holdings Ltd | Real estate | 2024 |
| Rosslade Limited | Financial services | 2011 |
| Rove Properties Ltd | Real estate | 2024 |
| Rover Subsea Ltd | Professional & scientific | 2025 |
| ROX Trading Services Ltd | Wholesale & retail | 2024 |
| Roxborough Realty Ltd | Financial services | 2013 |
| Royal School Armagh Limited | Wholesale & retail | 1998 |
| RPG Civils Limited | Construction | 2023 |
| RS Jardine Ltd | Health & social care | 2025 |
| RTA Tankers Ltd | Manufacturing | 2026 |
| Rubex Manufacturing Limited | Professional & scientific | 2025 |
| Rugs Supermarket.Com Ltd | Wholesale & retail | 2010 |
| Rumour Coffee Ltd. | Hospitality | 2009 |
| Run Back Limited | Hospitality | 2026 |
| Rural Coffee Kiosk Ltd | Hospitality | 2025 |
| Russell Street Ltd | Extraterritorial | 2010 |
| Ryan Donnelly Electrical Ltd | Construction | 2025 |
| S & a Hayes Mechanical & Engineering Group Ltd | Professional & scientific | 2024 |
| S Fleville Haulage Ltd | Transport & logistics | 2018 |
| S Kilpatrick Haulage Ltd | Transport & logistics | 2018 |
| S Mckee Transport Limited | Transport & logistics | 2012 |
| S&J MAC Tools Limited | Wholesale & retail | 2017 |
| S.C. Electrical (N.I.) Limited | Manufacturing | 2020 |
| Sage Capital (Holdings) Ltd | Financial services | 2022 |
| Sahin Tailoring & Alteration Limited | Manufacturing | 2020 |
| Saints & Scholars Integrated Primary School Ltd. | Education | 1992 |
| Sallyridge Produce Ltd | Agriculture & fishing | 2007 |
| Sami Hospitality Ltd | Hospitality | 2025 |
| Sandford Contracting Solutions Ltd | Professional & scientific | 2018 |
| Sarafu Technology Solutions Ltd | Information & communication | 2018 |
| Sarcon (NO. 341) Limited | Hospitality | 2010 |
| Sarcon (NO.214) Limited | Hospitality | 2006 |
| Savage & Sons Caravans Ltd | Transport & logistics | 2015 |
| Savannagh Healthcare Limited | Professional & scientific | 2006 |
| SBP Group Limited | Construction | 2016 |
| Scars Racing Ltd | Wholesale & retail | 2025 |
| SCC Advisory Ltd | Professional & scientific | 2024 |
| Scentique Ltd | Wholesale & retail | 2026 |
| School Web Design Limited | Information & communication | 2013 |
| Sclenn Ltd | Agriculture & fishing | 2025 |
| Scott's Sales NI Ltd | Wholesale & retail | 2023 |
| Scotwell Child Care Ltd | Education | 2011 |
| Scully Grower Supplies Limited | Wholesale & retail | 2025 |
| Scully Supplies Limited | Wholesale & retail | 2003 |
| SDN Utilities Ltd | Information & communication | 2017 |
| Seagate Property Ltd | Hospitality | 2016 |
| Sealmax Maintenance & Reburbishment Ltd | Construction | 2024 |
| Sealmax Roofing and Cladding Ltd | Construction | 2024 |
| Sealmax Roofing Limited | Construction | 2016 |
| SEE YOU Latte Ltd | Hospitality | 2022 |
| Sell Your Pallet Racking Limited | Other services | 2022 |
| Serena Will Properties Ltd | Real estate | 2022 |
| Setanta Fitness Ltd | Arts & recreation | 2010 |
| Sevenmair Ltd | Administrative & support | 2019 |
| SFE Electrical Ltd | Construction | 2009 |
| SFM Commercial Properties Ltd | Construction | 2021 |
| SFM Engineering | Manufacturing | 2006 |
| SFS Plastics Limited | Manufacturing | 2011 |
| SFS Rotational Moulding Ltd | Manufacturing | 2017 |
| SG Elite Ltd | Agriculture & fishing | 2017 |
| SGA Capital Limited | Wholesale & retail | 2018 |
| Sghaulagearmagh Ltd | Transport & logistics | 2026 |
| Shabby Duck Gifts and Vintage Finds Ltd | Wholesale & retail | 2024 |
| Shalom Trading Ltd | Real estate | 2003 |
| Shamrock Homes Limited | Other services | 2016 |
| Shapla Armagh Ltd | Hospitality | 2023 |
| Shaughan Eggs Limited | Agriculture & fishing | 2017 |
| Shaws Fisheries Ltd | Agriculture & fishing | 2021 |
| Shea and Seed Limited | Manufacturing | 2026 |
| Sherry Transport Ltd | Transport & logistics | 2021 |
| Shielder Chassis Limited | Manufacturing | 2019 |
| Shine Auto Services Ltd | Wholesale & retail | 2020 |
| Shipping Containers Ireland Ltd | Wholesale & retail | 2023 |
| Sillis Fruit Limited | Wholesale & retail | 2012 |
| Silvermac Ltd | Transport & logistics | 2025 |
| Silverstream Services Ltd. | Wholesale & retail | 2011 |
| Silvey T Limited | Wholesale & retail | 2026 |
| Simms Brothers Ltd | Wholesale & retail | 2021 |
| Simon Black Architecture Limited | Professional & scientific | 2021 |
| Simply Kids Photography Ltd | Other services | 2017 |
| Sintra International Ltd | Construction | 2025 |
| Skin Clinic Armagh Limited | Other services | 2016 |
| Slate Supplies (NI) Ltd | Manufacturing | 2006 |
| SM Fixings & Supplies Ltd | Wholesale & retail | 2020 |
| SM Quality Solutions | Professional & scientific | 2022 |
| SMARTHIRE365 Ltd | Professional & scientific | 2022 |
| Smcnic Ltd | Health & social care | 2023 |