| 1 | Galgorm Manor Hotel Limited Hotels and similar accommodation Turnover £39.2M | £56.9M | £39.2M |
| 2 | C.J. Upton & Sons Limited Wholesale of metals and metal ores Turnover £94.7M | £47.6M | £94.7M |
| 3 | Gaelectric Natural Resources Limited Trade of electricity | £43.0M 2024 accounts | — |
| 4 | Dunbeg Windfarm Limited Production of electricity | £37.6M 2024 accounts | — |
| 5 | HHG No4. Limited Hotels and similar accommodation Turnover £18.1M | £34.1M | £18.1M |
| 6 | Graffan Properties Limited Hotels and similar accommodation Turnover £9.6M | £23.2M | £9.6M |
| 7 | Forestwood Agencies Limited Agents involved in the sale of timber and building materials | £20.2M | — |
| 8 | Wineflair (Belfast) Limited Retail sale of beverages in specialised stores Turnover £35.0M | £16.7M | £35.0M |
| 9 | Colorite Europe Limited Manufacture of other plastic products Turnover £19.2M | £16.6M 2024 accounts | £19.2M |
| 10 | John H. Lunn (Jewellers), Limited Other retail sale of new goods in specialised stores (not commercial art galleries and opticians) Turnover £37.3M | £16.5M 2024 accounts | £37.3M |
| 11 | Mantlin Limited Other business support service activities n.e.c. Turnover £20.8M | £14.5M | £20.8M |
| 12 | Lagan Aviation & Infrastructure Limited Construction of other civil engineering projects n.e.c. Turnover £63.1M | £14.3M 2024 accounts | £63.1M |
| 13 | Pandox Belfast Limited Hotels and similar accommodation | £14.1M 2023 accounts | — |
| 14 | RMS Cash Solutions Limited Private security activities Turnover £19.4M | £13.7M | £19.4M |
| 15 | Portview Fit-Out Limited Other building completion and finishing Turnover £109.6M | £13.5M | £109.6M |
| 16 | Kingsbridge Private Hospital North West Limited Hospital activities | £12.3M 2020 accounts | — |
| 17 | Commercial Court Inns Limited Licensed restaurants | £11.6M 2024 accounts | — |
| 18 | Beggs & Partners Ltd Wholesale of other intermediate products | £10.9M | — |
| 19 | Wellington Computer Systems Limited Other information technology service activities Turnover £10.3M | £10.4M 2024 accounts | £10.3M |
| 20 | Antrim Electrical & Mechanical Engineers Limited Electrical installation Turnover £41.5M | £10.2M | £41.5M |
| 21 | A M Transport Services Ltd Freight transport by road | £9.6M | — |
| 22 | Parkelect Limited Wholesale of other machinery and equipment Turnover £29.9M | £9.2M | £29.9M |
| 23 | Inislyn Limited Hotels and similar accommodation Turnover £4.5M | £8.9M 2023 accounts | £4.5M |
| 24 | Eurocables (Belfast) Limited Wholesale of electronic and telecommunications equipment and parts | £8.7M 2024 accounts | — |
| 25 | Causeway Trust Other letting and operating of own or leased real estate | £8.6M 2021 accounts | — |
| 26 | Shopkeep.Com Ltd Other business support service activities n.e.c. Turnover £9.1M | £8.2M | £9.1M |
| 27 | Linfield Football Club Limited Operation of sports facilities | £8.1M 2024 accounts | — |
| 28 | VG Mso Ltd Manufacture of printed labels Turnover £20.9M | £8.1M 2024 accounts | £20.9M |
| 29 | Industrial Temps Limited Temporary employment agency activities Turnover £23.9M | £7.9M | £23.9M |
| 30 | W.A.C. McCandless (Engineers) Limited Agents involved in the sale of machinery, industrial equipment, ships and aircraft | £7.5M | — |
| 31 | Wind Energy (NI) Limited Production of electricity | £7.1M 2019 accounts | — |
| 32 | Carn Hill Windfarm Limited Production of electricity | £7.1M 2024 accounts | — |
| 33 | Church of Ireland Orphans and Childrens Society for the Counties of Antrim and Down Activities of religious organizations | £6.7M 2019 accounts | — |
| 34 | CCL Label Ireland Limited Manufacture of other articles of paper and paperboard n.e.c. | £6.7M 2024 accounts | — |
| 35 | Data Intellect Services Limited Business and domestic software development | £6.7M 2020 accounts | — |
| 36 | NPH Holdings (N.I.) Ltd Activities of head offices Turnover £20.0M | £6.6M | £20.0M |
| 37 | Befab Limited Manufacture of other fabricated metal products n.e.c. | £6.3M 2024 accounts | — |
| 38 | Courtney & Nelson Limited Agents involved in the sale of food, beverages and tobacco | £6.1M 2023 accounts | — |
| 39 | Nightingale Bidco Limited Activities of other holding companies n.e.c. | £6.1M 2024 accounts | — |
| 40 | Niace Limited Other professional, scientific and technical activities n.e.c. Turnover £192.8k | £5.8M 2024 accounts | £192.8k |
| 41 | Limetree Residential Limited Residential nursing care facilities | £5.8M | — |
| 42 | Workforce Training Services Limited Other education n.e.c. | £5.7M 2021 accounts | — |
| 43 | Barclay Digital Services Ltd Other telecommunications activities | £5.3M | — |
| 44 | SFG Forwarding Limited Freight transport by road | £5.0M | — |
| 45 | Merchant Warehouse (NI) Ltd Ready-made interactive leisure and entertainment software development Turnover £9.3M | £4.9M 2023 accounts | £9.3M |
| 46 | Belfast International Watersports Limited Operation of sports facilities | £4.8M 2021 accounts | — |
| 47 | Heyn Engineering (NI) Limited Manufacture of metal structures and parts of structures | £4.8M | — |
| 48 | H.& J. Martin Limited Construction of commercial buildings Turnover £50.8M | £4.4M 2024 accounts | £50.8M |
| 49 | Mifinity UK Limited Activities auxiliary to financial intermediation n.e.c. Turnover £10.8M | £4.2M 2023 accounts | £10.8M |
| 50 | Cregganconroe Windfarm Limited Production of electricity | £4.2M 2024 accounts | — |
| 51 | Biopax Limited Manufacture of other paper and paperboard containers Turnover £8.1M | £4.1M | £8.1M |
| 52 | Larsen (Manufacturing) Limited Manufacture of other non-metallic mineral products n.e.c. | £4.1M 2024 accounts | — |
| 53 | Ocu Nettworx Limited Construction of utility projects for electricity and telecommunications | £3.9M 2024 accounts | — |
| 54 | M/a-Com Technology Solutions (UK) Limited Agents specialized in the sale of other particular products | £3.8M 2022 accounts | — |
| 55 | Eso Solutions UK Ltd Business and domestic software development Turnover £13.2M | £3.7M | £13.2M |
| 56 | Total Cargo Services (N.I.) Limited Freight transport by road | £3.6M 2020 accounts | — |
| 57 | Aflac Northern Ireland Ltd Other information technology service activities Turnover £18.6M | £3.5M | £18.6M |
| 58 | Inishative Windfarm Limited Production of electricity | £3.5M 2024 accounts | — |
| 59 | Todd Architects Ltd Architectural activities | £3.3M | — |
| 60 | Vanrath Recruitment Limited Temporary employment agency activities | £3.2M 2021 accounts | — |
| 61 | C.I. Retailers (N.I.) Limited Wholesale of radio, television goods & electrical household appliances (other than records, tapes, CD's & video tapes and the equipment used for playing them) Turnover £15.0M | £3.1M 2024 accounts | £15.0M |
| 62 | Northern Growers Limited Dormant Company Turnover £0 | £3.0M 2022 accounts | £0 |
| 63 | Grant Thornton (NI) LLP Turnover £23.1M | £2.7M 2024 accounts | £23.1M |
| 64 | Monnaboy Windfarm Limited Production of electricity | £2.7M 2024 accounts | — |
| 65 | M & M Contractors (Europe) Ltd Construction of utility projects for electricity and telecommunications Turnover £20.3M | £2.7M | £20.3M |
| 66 | MCS Personnel Limited Other activities of employment placement agencies | £2.7M 2020 accounts | — |
| 67 | Zampell Limited Other specialised construction activities n.e.c. | £2.7M 2023 accounts | — |
| 68 | Humax Electronics Co. Ltd Other service activities n.e.c. Turnover £30.9M | £2.7M 2023 accounts | £30.9M |
| 69 | Prentice Portadown Limited Sale of new cars and light motor vehicles Turnover £47.6M | £2.6M 2024 accounts | £47.6M |
| 70 | Cloonty Windfarm Limited Production of electricity | £2.2M 2024 accounts | — |
| 71 | Portview Holdings Limited Activities of construction holding companies Turnover £90 | £2.2M | £90 |
| 72 | Corby Knowe Windfarm Limited Production of electricity | £1.9M 2024 accounts | — |
| 73 | WF Risk Group Limited Activities of other holding companies n.e.c. | £1.8M 2024 accounts | — |
| 74 | Mascott Construction (Europe) Ltd Construction of commercial buildings | £1.4M 2022 accounts | — |
| 75 | Radius Vehicle Solutions (NI) Limited Renting and leasing of cars and light motor vehicles | £1.3M 2019 accounts | — |
| 76 | Doran Consulting Limited Engineering related scientific and technical consulting activities | £1.3M 2024 accounts | — |
| 77 | Video Content Library Limited Advertising agencies Turnover £1.8M | £1.3M 2024 accounts | £1.8M |
| 78 | Bedford Consultancy Services Limited Management consultancy activities other than financial management | £1.2M 2021 accounts | — |
| 79 | Nijobs.Com Ltd Temporary employment agency activities | £1.1M 2021 accounts | — |
| 80 | Springfield Charitable Association Limited Other business support service activities n.e.c. | £1.1M | — |
| 81 | Gaelectric Green Energy Limited Trade of electricity | £1.1M 2024 accounts | — |
| 82 | C.B. Contracts (N.I.) Ltd Floor and wall covering | £1.0M 2023 accounts | — |
| 83 | Zest Investment Property Group Limited Other business support service activities n.e.c. | £902.1k | — |
| 84 | Gallaghers Bakehouse (NI) Ltd Agents involved in the sale of food, beverages and tobacco Turnover £2.3M | £797.9k | £2.3M |
| 85 | Accord Northern Ireland Catholic Marriage Care Service Other service activities n.e.c. | £726.0k 2024 accounts | — |
| 86 | Cybit North Limited Information technology consultancy activities | £719.9k 2020 accounts | — |
| 87 | Alpha Marketing UK Limited Wholesale of office furniture | £679.3k 2024 accounts | — |
| 88 | Aer Lingus (U.K.) Limited Scheduled passenger air transport Turnover £5.0M | £600.8k 2021 accounts | £5.0M |
| 89 | Ulster Hockey Ltd Sports and recreation education | £505.9k 2024 accounts | — |
| 90 | Parr Group Limited Activities of head offices | £492.9k | — |
| 91 | Crown Jesus Ministries Activities of other membership organizations n.e.c. | £465.7k | — |
| 92 | Cattle Eye Ltd Business and domestic software development | £294.9k 2024 accounts | — |
| 93 | Aergo Capital Services Limited Activities of other holding companies n.e.c. Turnover £1.3M | £285.7k 2023 accounts | £1.3M |
| 94 | Ulster-Scots Community Network Activities of other membership organizations n.e.c. | £213.8k 2024 accounts | — |
| 95 | Men's Advisory Project - the Other social work activities without accommodation n.e.c. | £210.9k 2024 accounts | — |
| 96 | JHL Retail Limited Other service activities n.e.c. Turnover £341.2k | £210.4k 2024 accounts | £341.2k |
| 97 | Relatives for Justice Ltd. Activities of other membership organizations n.e.c. | £206.5k 2024 accounts | — |
| 98 | S & E Wind Energy Limited Production of electricity | £186.0k 2019 accounts | — |
| 99 | NI Opera Performing arts | £168.6k 2024 accounts | — |
| 100 | Shuz 4 U Belfast Ltd Wholesale of clothing and footwear | £148.5k | — |
| 101 | Forsight Ltd Retail sale of other second-hand goods in stores (not incl. antiques) | £136.9k 2022 accounts | — |
| 102 | Shuz 4 U Banbridge Ltd Retail sale of footwear in specialised stores | £123.2k | — |
| 103 | Fibrus Networks Ltd Other telecommunications activities | £109.3k 2020 accounts | — |
| 104 | Artificialdev Limited Business and domestic software development Turnover £572.3k | £93.0k | £572.3k |
| 105 | Knock Child Contact Centre Other social work activities without accommodation n.e.c. | £80.0k 2024 accounts | — |
| 106 | Politics in Action Other education n.e.c. | £48.7k 2023 accounts | — |
| 107 | Bishops' Appeal (NI) Limited Other education n.e.c. | £33.4k 2019 accounts | — |
| 108 | Servant Trust Activities of religious organizations | £28.8k 2024 accounts | — |
| 109 | Belfast Educational Services (Dungannon) Holdings Ltd Other business support service activities n.e.c. | £25.0k | — |
| 110 | Larsen Associates Limited Dormant Company | £16.3k 2024 accounts | — |
| 111 | Queen's Overseas Recruitment Limited First-degree level higher education Turnover £0 | £3.6k 2024 accounts | £0 |
| 112 | P.G.L Holdings (N.I.) Ltd Activities of head offices | £1.0k 2024 accounts | — |
| 113 | Kinstar Limited Activities of other holding companies n.e.c. | £300 | — |
| 114 | Larsen Newco 3 Limited Activities of head offices | £100 2024 accounts | — |
| 115 | Newforge Community Development Trust Cultural education | £0 2020 accounts | — |
| 116 | Queen's Composites Limited Activities of head offices Turnover £0 | -£14.2k 2024 accounts | £0 |
| 117 | Belfast Self Storage Limited Other retail sale in non-specialised stores | -£27.6k 2023 accounts | — |
| 118 | Labceutics Ltd Other professional, scientific and technical activities n.e.c. | -£50.5k 2023 accounts | — |
| 119 | Xerox Ibs NI Limited Renting and leasing of office machinery and equipment (including computers) | -£587.6k | — |
| 120 | Sam Aerospace (NI) Limited Manufacture of other fabricated metal products n.e.c. | -£1.8M 2024 accounts | — |
| 121 | Fairways Care Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 122 | Manach Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 123 | Cordovan Acquisitions II Limited Activities of other holding companies n.e.c. | — | — |
| 124 | Wee Chicks Family Ltd Other education n.e.c. | — | — |
| 125 | Uci GP Iii Limited Fund management activities | — | — |
| 126 | Grant Thornton Advisors (NI) LLP | — | — |
| 127 | Josten Ltd Activities of other holding companies n.e.c. | — 2024 accounts | — |
| 128 | Ferien Acquisitions Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 129 | Crucible (No.1) Ltd Factoring | — | — |
| 130 | Pinewood Holdings (N.I.) Limited Activities of head offices | — | — |
| 131 | Titan GRP Limited Wholesale of hardware, plumbing and heating equipment and supplies | — | — |
| 132 | Wind Energy 4 Hold Co Limited Production of electricity | — | — |
| 133 | MHL Hospitality Limited Hotels and similar accommodation | — | — |
| 134 | Doran Consulting Group Limited Engineering related scientific and technical consulting activities | — | — |
| 135 | The Arn Foundation Other social work activities without accommodation n.e.c. | — 2024 accounts | — |
| 136 | E Grid Services Limited Production of electricity | — | — |
| 137 | Portview Specialists Holdings Limited Activities of construction holding companies | — | — |
| 138 | Untold: the Museum Ltd Museums activities | — | — |
| 139 | Quadrapharm Limited Activities of other holding companies n.e.c. | — | — |
| 140 | Strathmore Holdco Ltd Activities of other holding companies n.e.c. | — 2024 accounts | — |
| 141 | Moyle Holdings No.2 Limited Activities of head offices | — | — |
| 142 | Hastings Hotels Group Limited Hotels and similar accommodation | — | — |
| 143 | MDG Golf (UK) Limited Non-specialised wholesale trade | — | — |
| 144 | Punjana Holdings Ltd Activities of production holding companies | — | — |
| 145 | Greenfields Ireland Group Limited Wholesale of dairy products, eggs and edible oils and fats | — 2022 accounts | — |
| 146 | Simon Community Creating Homes Other service activities n.e.c. | — 2024 accounts | — |
| 147 | Altgolan Wind Farm Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 148 | Dooish Wind Farm Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 149 | H&J Martin Group Limited Activities of other holding companies n.e.c. | — 2024 accounts | — |
| 150 | Lagan Specialist Infrastructure Group Limited Activities of construction holding companies | — 2024 accounts | — |
| 151 | Javian Ltd Development of building projects | — | — |
| 152 | The 3173 Company Limited Other activities auxiliary to insurance and pension funding | — | — |
| 153 | AM Transport Services Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 154 | O'Brien Fine Foods Holdings (UK) Limited Manufacture of other food products n.e.c. | — 2024 accounts | — |
| 155 | PT McWilliams Group Ltd Activities of other holding companies n.e.c. | — 2024 accounts | — |
| 156 | A&L Goodbody Northern Ireland LLP | — | — |
| 157 | Harvest Bidco Limited Activities of other holding companies n.e.c. | — | — |
| 158 | Harvest Topco Limited Activities of other holding companies n.e.c. | — | — |
| 159 | MBLR Holdings Limited Activities of other holding companies n.e.c. | — 2023 accounts | — |
| 160 | PGB Sports Brands UK Limited Wholesale of clothing and footwear | — | — |
| 161 | Wind Energy 3 Hold Co Limited Activities of other holding companies n.e.c. | — | — |
| 162 | 2682 Bloomfield SC Bangor (Leaseco) Limited Fitness facilities | — | — |
| 163 | 2717 Crescent Link Londonderry (Leaseco) Limited Fitness facilities | — | — |
| 164 | McAdam Group Limited Management consultancy activities other than financial management | — 2023 accounts | — |
| 165 | WF Risk Group (Holdings) Ltd Activities of other holding companies n.e.c. | — 2024 accounts | — |
| 166 | Reperio Human Capital (Holdings) Ltd Temporary employment agency activities | — | — |
| 167 | Acorn Holdco II Limited Other telecommunications activities | — | — |
| 168 | Acorn Holdco Ltd Other telecommunications activities | — | — |
| 169 | Hypixel Studios Limited Publishing of computer games | — | — |
| 170 | Tetra Tech Consulting (NI) Limited Engineering related scientific and technical consulting activities | — 2020 accounts | — |
| 171 | Sidequest Ltd Publishing of computer games | — | — |
| 172 | Intact Insurance | — | — |
| 173 | Belfast Energy Storage Company Limited Production of electricity | — | — |
| 174 | Fscom Holdings Limited Other professional, scientific and technical activities n.e.c. | — 2021 accounts | — |
| 175 | Tughans LLP | — | — |
| 176 | Tate Group Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 177 | McCausland Group Limited Taxi operation | — 2024 accounts | — |
| 178 | Energia Hydrogen Limited Manufacture of gas | — | — |
| 179 | Mary Ann McCracken Foundation Other service activities n.e.c. | — 2023 accounts | — |
| 180 | Lisburn Square No.2 Limited Other letting and operating of own or leased real estate | — | — |
| 181 | Kids Together Belfast Other business support service activities n.e.c. | — 2021 accounts | — |
| 182 | Larsen Newco 5 Limited Other service activities n.e.c. | — 2024 accounts | — |
| 183 | Musgrave Retail Stores NI Limited Retail sale in non-specialised stores with food, beverages or tobacco predominating | — | — |
| 184 | Bullitt Holding Limited Activities of other holding companies n.e.c. | — | — |
| 185 | W&R Barnett Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 186 | Fibrus Ltd Wired telecommunications activities | — 2019 accounts | — |
| 187 | WRM Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 188 | Bri Wind Farms 6 Limited Production of electricity | — | — |
| 189 | Dac Beachcroft (N.Ireland) LLP | — | — |
| 190 | Somerville Enterprise Holdings Ltd Manufacture of office and shop furniture | — 2024 accounts | — |
| 191 | Shuz 4 U Abbey Centre Ltd Retail sale of footwear in specialised stores | — | — |
| 192 | Bullitt Trading Limited Hotels and similar accommodation | — | — |
| 193 | Totalis Group Limited Activities of construction holding companies | — | — |
| 194 | NWP Holdco Limited Activities of other holding companies n.e.c. | — | — |
| 195 | Beannchor Group Limited Hotels and similar accommodation | — | — |
| 196 | Gilbert-Ash Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 197 | Uci GP II Limited Fund management activities | — | — |
| 198 | Uci FP Limited Fund management activities | — 2024 accounts | — |
| 199 | Healthy Living Centres Alliance Ltd Other human health activities | — | — |
| 200 | Murroe UK Limited Activities of head offices | — | — |
| 201 | Teamworkers UK Limited Other business support service activities n.e.c. | — | — |
| 202 | Vanrath Holdings Limited Activities of other holding companies n.e.c. | — 2021 accounts | — |
| 203 | Deloitte Ireland LLP | — | — |
| 204 | Process Automation & Calibrations Limited Construction of other civil engineering projects n.e.c. | — 2024 accounts | — |
| 205 | Sysco Software Holdco Limited Activities of head offices | — | — |
| 206 | Bamboo Rose Ltd Business and domestic software development | — | — |
| 207 | Recoz Holding Limited Activities of head offices | — 2023 accounts | — |
| 208 | Belfast Storage Limited Operation of warehousing and storage facilities for land transport activities | — | — |
| 209 | NI Water Clear Limited Water collection, treatment and supply | — | — |
| 210 | Energia Group NI Financeco PLC Financial intermediation not elsewhere classified | — | — |
| 211 | Lagan Aviation & Infrastructure Group Holdings Limited Construction of other civil engineering projects n.e.c. | — 2024 accounts | — |
| 212 | Interpay UK Limited Other business support service activities n.e.c. | — | — |
| 213 | Ulster University Students' Union Other education n.e.c. | — | — |
| 214 | Rockpool Acquisitions PLC Non-trading company | — 2024 accounts | — |
| 215 | Dargan Road Biogas Limited Production of electricity | — | — |
| 216 | Morrow Group Limited Construction of roads and motorways | — | — |
| 217 | McLegz Holdings Ltd Licensed restaurants | — 2024 accounts | — |
| 218 | West Transmission Financing PLC Activities of head offices | — | — |
| 219 | Donnybrook (Holdings) Limited Non-trading company | — | — |
| 220 | Energia Renewables Company 4 Limited Activities of other holding companies n.e.c. | — | — |
| 221 | Sportsengine UK Limited Web portals | — | — |
| 222 | MCS Personnel Holdings Limited Activities of other holding companies n.e.c. | — 2020 accounts | — |
| 223 | Irish FA Foundation Limited Other sports activities | — | — |
| 224 | Lord Enniskillen Memorial Orange Society Other social work activities without accommodation n.e.c. | — | — |
| 225 | Energia NI Storage Limited Activities of other holding companies n.e.c. | — | — |
| 226 | Out of Office Brewing Limited Buying and selling of own real estate | — | — |
| 227 | Willmount Limited Production of electricity | — | — |
| 228 | Wifco Limited Other business support service activities n.e.c. | — 2024 accounts | — |
| 229 | Bri Wind Farms 4 Limited Production of electricity | — | — |
| 230 | The James Kane Foundation Other education n.e.c. | — | — |
| 231 | GHL (Lisburn NI) Limited Development of building projects | — 2024 accounts | — |
| 232 | Burnview Holdings Limited Activities of other holding companies n.e.c. | — 2024 accounts | — |
| 233 | Belfast Waterfront and Ulster Hall Limited Support activities to performing arts | — | — |
| 234 | Codec-Dss Ltd Information technology consultancy activities Turnover £2.9M | — | £2.9M |
| 235 | Lagan Investments Ltd. Activities of other holding companies n.e.c. | — | — |
| 236 | Shuz 4 U Newry Ltd Retail sale of footwear in specialised stores | — | — |
| 237 | Choice Services (Ireland) Limited Other specialised construction activities n.e.c. | — | — |
| 238 | Heyn Limited Other business support service activities n.e.c. | — | — |
| 239 | Energia Renewables Company 3 Limited Activities of other holding companies n.e.c. | — | — |
| 240 | Innalabs UK Limited Agents involved in the sale of machinery, industrial equipment, ships and aircraft | — 2023 accounts | — |
| 241 | Andrews Flour Mills Limited Grain milling | — | — |
| 242 | Andrews Group Limited Activities of other holding companies n.e.c. | — | — |
| 243 | Leukaemia & Lymphoma NI Other human health activities | — 2020 accounts | — |
| 244 | Energia Renewables Company 2 Limited Activities of other holding companies n.e.c. | — | — |
| 245 | Maple and May (Homes) Ltd. Construction of domestic buildings | — | — |
| 246 | Galar Holdings Limited Activities of other holding companies n.e.c. | — 2020 accounts | — |
| 247 | Pyramid UK Hotel Limited Management consultancy activities other than financial management | — 2023 accounts | — |
| 248 | Kingsbridge Healthcare Group Limited Other human health activities | — | — |
| 249 | Altaveedan Energy Limited Production of electricity | — | — |
| 250 | Shuz 4 U Rushmere Ltd Wholesale of clothing and footwear | — | — |
| 251 | Creighton Group Ltd Activities of other holding companies n.e.c. | — | — |
| 252 | Eastside Arts Support activities to performing arts | — | — |
| 253 | Creightons of Balmoral Ltd Retail sale of automotive fuel in specialised stores | — | — |
| 254 | Cumulus Neuroscience Limited Business and domestic software development | — | — |
| 255 | Lagan Homes Group Ltd Activities of head offices | — | — |
| 256 | Allstate Global Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 257 | Axon Financial Systems Limited Business and domestic software development | — 2023 accounts | — |
| 258 | Baker & McKenzie Global Services NI Limited Activities of patent and copyright agents; other legal activities n.e.c. | — | — |
| 259 | Morgan McLernon Limited Freight transport by road | — | — |
| 260 | Crockandun Wind Farm Limited Production of electricity | — | — |
| 261 | NTR Green Energy Holdings Limited Other business support service activities n.e.c. | — | — |
| 262 | North Down Trading (NI) Limited Other letting and operating of own or leased real estate | — | — |
| 263 | MKB Co No 56 Limited Other letting and operating of own or leased real estate | — | — |
| 264 | Orby Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 265 | Flogas Natural Gas Ltd Trade of gas through mains | — | — |
| 266 | Kainos Evolve Limited Other information technology service activities | — | — |
| 267 | Kainos Worksmart Limited Other information technology service activities | — | — |
| 268 | Lagan Ground Engineering Holdings Limited Site preparation | — 2024 accounts | — |
| 269 | Lagan Specialist Utilities & Maintenance Group Limited Other specialised construction activities n.e.c. | — 2024 accounts | — |
| 270 | Communicorp UK Limited Radio broadcasting | — | — |
| 271 | Ritcin Limited Unlicensed restaurants and cafes | — | — |
| 272 | Lagan Infrastructure Limited Activities of other holding companies n.e.c. | — | — |
| 273 | Union Street (Lurgan) Limited Other business support service activities n.e.c. | — | — |
| 274 | The Controlled Schools' Support Council Educational support services | — 2024 accounts | — |
| 275 | Hometime Group Limited Retail of furniture, lighting, and similar (not musical instruments or scores) in specialised store | — | — |
| 276 | NI Gpi Limited Activities of venture and development capital companies | — | — |
| 277 | NI Venture Nominees Limited Activities of venture and development capital companies | — | — |
| 278 | Glor NA Mona Teo Cultural education | — | — |
| 279 | Denvir Holdings Limited Activities of head offices | — | — |
| 280 | Axial Medical Printing Limited Other research and experimental development on natural sciences and engineering | — | — |
| 281 | Christian Fellowship Church Activities of religious organizations | — 2024 accounts | — |
| 282 | Netwatch System Limited Security systems service activities | — | — |
| 283 | Ducales Capital Limited Activities of head offices | — | — |
| 284 | Cathedral Leisure Limited Public houses and bars | — | — |
| 285 | Beannchor No. 1 Limited Hotels and similar accommodation | — | — |
| 286 | Camseng International Foods Limited Other retail sale of food in specialised stores | — 2024 accounts | — |
| 287 | Friends of the Cancer Centre Activities of other membership organizations n.e.c. | — 2024 accounts | — |
| 288 | Jat (No.3) Limited Activities of other holding companies n.e.c. | — | — |
| 289 | Jar (Ire) Ltd Renting and leasing of other machinery, equipment and tangible goods n.e.c. | — 2022 accounts | — |
| 290 | Branch Campus (London & Birmingham) Limited First-degree level higher education | — | — |
| 291 | Uci GP Limited Fund management activities | — | — |
| 292 | North West Regional Science Park Limited Development of building projects | — | — |
| 293 | Eliassen (NI) Limited Information technology consultancy activities | — 2023 accounts | — |
| 294 | Carson McDowell LLP | — | — |
| 295 | Securitas Technology (NI) Limited Security systems service activities | — | — |
| 296 | Therapie Fertility (UK) Limited Other human health activities | — | — |
| 297 | Victims and Survivors Service Limited General public administration activities | — | — |
| 298 | Bryson Recycling Limited Collection of non-hazardous waste | — | — |
| 299 | Human Rights Consortium Activities of other membership organizations n.e.c. | — | — |
| 300 | Shell & Topaz Aviation Limited Wholesale of petroleum and petroleum products | — | — |