| Oothoose Ltd | Construction | 2023 |
| Orimah Ltd | Agriculture & fishing | 2026 |
| Orra Wind Limited | Energy | 2016 |
| P S Engineering (Co Antrim) Ltd | Manufacturing | 2012 |
| Pathlogic Limited | Other services | 2004 |
| Patrick Grant Orla Grant Ltd | Manufacturing | 2022 |
| Pattons Crafts Ltd | Wholesale & retail | 2021 |
| Payescape Ltd | Financial services | 2014 |
| Pbsni LLP | | 2024 |
| PC Contracts Ltd | Construction | 2016 |
| PCS Property Ltd | Real estate | 2023 |
| Pearl Beauty Cosmetics Ltd | Wholesale & retail | 2020 |
| Peregrine Livefoods NI Ltd | Wholesale & retail | 2026 |
| Pizza Piccola Ltd | Hospitality | 2023 |
| Platt Estates (NI) Ltd | Real estate | 2017 |
| Plumsop Ltd | Wholesale & retail | 2024 |
| Pocket FOX Pictures Limited | Information & communication | 2012 |
| Premier Food Supplies Ltd | Wholesale & retail | 2023 |
| Pro TEC Workwear Ltd | Wholesale & retail | 2019 |
| Pro-Design (N.I.) Limited | Professional & scientific | 2008 |
| Property Restore Limited | Construction | 2017 |
| Pureclean Deepclean Ltd | Administrative & support | 2019 |
| Pursue More Fitness Limited | Arts & recreation | 2025 |
| Quenchco. Ltd | Manufacturing | 2024 |
| R & J Foods Ltd | Wholesale & retail | 1999 |
| R C C Groundworks Limited | Construction | 2015 |
| R J Mcelheran & Sons Ltd | Agriculture & fishing | 2023 |
| R Mclester's Family Butchers Ltd | Wholesale & retail | 2019 |
| R S Construction (Co Antrim) Ltd | Construction | 2019 |
| Ramlo Holdings Ltd | Financial services | 2025 |
| Rankin Farm Eggs Limited | Agriculture & fishing | 2018 |
| Rbupvc Ltd | Construction | 2026 |
| Red Rock Lodge Limited | Hospitality | 2026 |
| REM Group Ltd | Transport & logistics | 2015 |
| Rendezvous 1 Limited | Arts & recreation | 2016 |
| Rg's Autos Ltd | Wholesale & retail | 2019 |
| Rio's Barber Shop Ltd | Other services | 2026 |
| Riverfort Eggs Ltd | Agriculture & fishing | 2024 |
| Rivermill Farm Ltd | Agriculture & fishing | 2024 |
| Riverside Ballymoney Limited | Professional & scientific | 2024 |
| RJ Digital Solutions Ltd | Wholesale & retail | 2025 |
| RJ Mcmullan & Co Limited | Professional & scientific | 2014 |
| RK Automotive Solutions Ltd | Wholesale & retail | 2025 |
| Robinson Memorial Hospital Ballymoney (Incorporated) | Health & social care | 1932 |
| Rosepark Farm Ltd | Arts & recreation | 2015 |
| Route Restoration Ltd | Construction | 2013 |
| Route Taxis Ltd | Transport & logistics | 2019 |
| Rumbol (International) Ltd | Wholesale & retail | 2023 |
| Rustaq Investments Limited | Extraterritorial | 2015 |
| S J Mcauley Engineering Limited | Extraterritorial | 2012 |
| S Pollock and Partners Limited | Agriculture & fishing | 2011 |
| S White ACS Ltd | Professional & scientific | 2024 |
| S. Christie Joinery Limited | Manufacturing | 1985 |
| S.G. Performance Ltd | Professional & scientific | 2006 |
| SAM Creith Motors Limited | Wholesale & retail | 2014 |
| Seacon BEG Farm Limited | Agriculture & fishing | 2017 |
| SGL Caravan Sales Ltd | Wholesale & retail | 2025 |
| Sharmont Properties Limited | Construction | 2006 |
| Shawssweets.Com Ltd | Wholesale & retail | 2021 |
| Sheans Horse Farm Ltd | Arts & recreation | 2018 |
| Shellfield Management Company Ltd | Extraterritorial | 2009 |
| Shelton Developments NI Ltd | Construction | 2009 |
| Shoe Retailers UK Limited | Wholesale & retail | 2010 |
| Shredding Solutions NI Ltd | Water & waste | 2026 |
| SID Capital Holdings Ltd | Real estate | 2025 |
| Silk and Thomas Holdings Limited | Hospitality | 2026 |
| Simple Risk Management Limited | Professional & scientific | 2016 |
| Simpson Design (N.I.) Ltd | Professional & scientific | 2017 |
| Siskodee Ltd | Other services | 2022 |
| SJM Transport Ltd | Transport & logistics | 2025 |
| SJN Tax Services Ltd | Professional & scientific | 2012 |
| Sma-Tec Services Ltd | Other services | 2024 |
| Smmotorsni | Wholesale & retail | 2021 |
| Smyth's Eurospar Limited | Wholesale & retail | 2017 |
| Sorela & Co Ltd | Other services | 2026 |
| Spicehouse Indoasian Ltd | Hospitality | 2025 |
| Sports Ground Specialists Ltd | Construction | 2023 |
| Star Price Events Ltd | Hospitality | 2025 |
| Stephen Murray Transport Ltd | Transport & logistics | 2011 |
| Storepro Limited | Information & communication | 2019 |
| Streamvale Developments Limited | Construction | 2006 |
| Stretch Marquees Ltd | Wholesale & retail | 2020 |
| Stroan Free Range Ltd | Agriculture & fishing | 2011 |
| Studio Mcburney Ltd | Professional & scientific | 2026 |
| STUDIO24(NI) Ltd | Arts & recreation | 2023 |
| Subsea Technical & Safety Services Ltd | Mining & quarrying | 2017 |
| Sunburst Tanning Ltd | Other services | 2015 |
| Sunkissed Tanning & Beauty Limited | Other services | 2021 |
| Sunrise Armoy Limited | Hospitality | 2024 |
| SÓ SOY Ltd | Wholesale & retail | 2025 |
| T & G Mcauley Ltd | Agriculture & fishing | 2025 |
| Taggart Estates Ltd | Wholesale & retail | 1946 |
| TALENT10 Ltd | Information & communication | 2016 |
| Tassels & Tiebacks Ltd | Manufacturing | 2023 |
| TC Vehicle Solutions Limited | Wholesale & retail | 2025 |
| Tecol Properties Ltd | Real estate | 2020 |
| Tekk Designs Limited | Manufacturing | 2016 |
| Terramax Machinery Ltd | Wholesale & retail | 2025 |
| Tgec Group NI Ltd | Wholesale & retail | 2023 |
| THE Barber Richardson Collective Limited | Manufacturing | 2022 |