| 1 | Orbis Education and Care Limited Residential care activities for learning difficulties, mental health and substance abuse Turnover £33.0M | £264.1M | £33.0M |
| 2 | Orbis Support Centre Limited Activities of other holding companies n.e.c. | £216.3M | — |
| 3 | Shine Bidco Limited Activities of head offices | £176.8M | — |
| 4 | Rubicone Midco Limited Activities of other holding companies n.e.c. | £134.8M | — |
| 5 | Iris Care Group Midco Limited Activities of other holding companies n.e.c. | £103.6M | — |
| 6 | Rubicone Finco Limited Activities of other holding companies n.e.c. | £58.9M | — |
| 7 | Pelican Healthcare Limited Manufacture of medical and dental instruments and supplies | £30.2M | — |
| 8 | Bad Wolf Ltd Television programme production activities | £28.1M | — |
| 9 | Ocean Community Services Limited Other human health activities Turnover £21.1M | £25.3M | £21.1M |
| 10 | Global Foods Limited Wholesale of wine, beer, spirits and other alcoholic beverages | £18.5M | — |
| 11 | Absolutely No Nonsense Admin Ltd Business and domestic software development | £16.4M 2019 accounts | — |
| 12 | Beechwood Court Limited Other education n.e.c. Turnover £11.2M | £15.5M | £11.2M |
| 13 | Holmleigh Care Homes Limited Residential care activities for learning difficulties, mental health and substance abuse Turnover £20.0M | £14.5M | £20.0M |
| 14 | Pembrokeshire Resource Centre Limited Residential care activities for learning difficulties, mental health and substance abuse Turnover £7.5M | £13.1M | £7.5M |
| 15 | Avantis Marine Limited Management consultancy activities other than financial management Turnover £65.7M | £12.5M 2024 accounts | £65.7M |
| 16 | Marel Ltd Manufacture of electronic industrial process control equipment | £12.4M | — |
| 17 | Les Croupiers Casino Limited Gambling and betting activities | £10.8M | — |
| 18 | Penarth Commercial Properties Limited Activities of head offices | £10.1M | — |
| 19 | Cardo (Wales & West) Limited Other building completion and finishing Turnover £35.6M | £9.1M 2023 accounts | £35.6M |
| 20 | Bect Building Contractors Limited Development of building projects Turnover £58.3M | £8.4M | £58.3M |
| 21 | Iris Care Group (Wales) Limited Activities of other holding companies n.e.c. Turnover £91.7k | £8.4M | £91.7k |
| 22 | John Bean Technologies Limited Manufacture of lifting and handling equipment | £8.4M | — |
| 23 | Capital Law Limited Solicitors | £8.2M 2020 accounts | — |
| 24 | Learna Limited Post-graduate level higher education Turnover £9.1M | £7.8M | £9.1M |
| 25 | Oshkosh Aerotech UK Limited Manufacture of other special-purpose machinery n.e.c. Turnover £19.9M | £7.0M 2024 accounts | £19.9M |
| 26 | Pinetree Care Services Limited Hospital activities Turnover £9.2M | £6.9M | £9.2M |
| 27 | St. Peter's Hospital Limited Hospital activities Turnover £10.0M | £6.4M | £10.0M |
| 28 | Gyrus Medical Limited Manufacture of medical and dental instruments and supplies | £6.4M 2023 accounts | — |
| 29 | H.T. Maddocks and Son (Whitchurch) Limited Non-specialised wholesale trade | £6.4M 2024 accounts | — |
| 30 | Pold Holdings Limited Other business support service activities n.e.c. Turnover £420.0k | £6.1M | £420.0k |
| 31 | Sunlight Education Nucleus Limited Other education n.e.c. | £6.1M | — |
| 32 | Eurobond Doors Limited Other manufacturing n.e.c. | £5.5M 2025 accounts | — |
| 33 | T.S.T Cardiff Limited Maintenance and repair of motor vehicles | £4.7M | — |
| 34 | Trakcel Limited Business and domestic software development | £4.7M | — |
| 35 | Veezu Midlands Limited Taxi operation | £4.6M 2020 accounts | — |
| 36 | Apcymru Limited Other education n.e.c. | £4.4M 2021 accounts | — |
| 37 | Catsci Ltd Other research and experimental development on natural sciences and engineering | £4.3M 2021 accounts | — |
| 38 | Hunky Dory Restaurants Ltd Unlicensed restaurants and cafes Turnover £61.1M | £4.3M 2024 accounts | £61.1M |
| 39 | Freight Systems Express (Wales) Limited Freight transport by road | £4.2M | — |
| 40 | Knox & Wells Limited Development of building projects Turnover £25.6M | £4.2M 2024 accounts | £25.6M |
| 41 | Smart Solutions (Recruitment) Limited Temporary employment agency activities Turnover £97.3M | £3.9M | £97.3M |
| 42 | Cardo (South) Limited Management of real estate on a fee or contract basis Turnover £52.6M | £3.8M 2024 accounts | £52.6M |
| 43 | Red Kite Business Services Limited Other business support service activities n.e.c. Turnover £11.5M | £3.8M | £11.5M |
| 44 | Welsh Power Group Limited Activities of head offices | £3.6M | — |
| 45 | Barber Holdings Limited Activities of head offices | £3.2M 2024 accounts | — |
| 46 | Howells Legal Limited Solicitors | £3.2M | — |
| 47 | Agri SGJ Limited Other food services Turnover £24.7M | £3.0M | £24.7M |
| 48 | Evans Electrical Limited Repair of electrical equipment Turnover £21.6M | £2.8M | £21.6M |
| 49 | Health Economics and Outcomes Research Ltd Management consultancy activities other than financial management Turnover £12.2M | £2.8M | £12.2M |
| 50 | C3 789 Limited Activities of other holding companies n.e.c. | £2.7M 2025 accounts | — |
| 51 | Magawell Limited Dispensing chemist in specialised stores | £2.6M | — |
| 52 | Activequote Limited Business and domestic software development | £2.5M 2023 accounts | — |
| 53 | Forward Waste Management Limited Other business support service activities n.e.c. Turnover £9.8M | £2.5M | £9.8M |
| 54 | Menai Meats (Wales) Limited Wholesale of meat and meat products Turnover £59.8M | £2.0M 2024 accounts | £59.8M |
| 55 | Atlantic Property Developments Limited Other letting and operating of own or leased real estate Turnover £700.2k | £2.0M 2025 accounts | £700.2k |
| 56 | Channel 3 Consulting Ltd Information technology consultancy activities Turnover £14.6M | £1.9M 2025 accounts | £14.6M |
| 57 | Purecyber Limited Information technology consultancy activities | £1.8M | — |
| 58 | Rush (Central) Limited Buying and selling of own real estate Turnover £0 | £1.8M 2020 accounts | £0 |
| 59 | Total Utility Connections Ltd Construction of utility projects for fluids | £1.6M 2023 accounts | — |
| 60 | Age Cymru Non-trading company | £1.3M | — |
| 61 | Encon Construction Limited Construction of other civil engineering projects n.e.c. | £1.2M | — |
| 62 | Welsh Refugee Council Other business support service activities n.e.c. | £1.0M 2023 accounts | — |
| 63 | Ludlow Street Healthcare Group Limited Activities of head offices Turnover £3.9M | £803.6k | £3.9M |
| 64 | Abbey Garages (Cardiff) Limited Sale of new cars and light motor vehicles | £523.8k | — |
| 65 | Tai Pawb Activities of other membership organizations n.e.c. | £430.8k | — |
| 66 | Prgco Limited Activities of head offices | £294.0k 2023 accounts | — |
| 67 | Screen Alliance for Wales Limited Other information service activities n.e.c. | £212.8k | — |
| 68 | Manifesto Foods Ltd Processing and preserving of meat | £168.1k 2023 accounts | — |
| 69 | Barber Trading Limited Activities of head offices | £100.0k 2024 accounts | — |
| 70 | Howells Legal (Holdings) Limited Activities of other holding companies n.e.c. | £94.9k | — |
| 71 | Neos 2 Ltd Public houses and bars | £76.8k 2023 accounts | — |
| 72 | Hodge Reversions Limited Activities of mortgage finance companies | £100 2022 accounts | — |
| 73 | Creditsafe UK Holding Limited Other business support service activities n.e.c. | £1 2020 accounts | — |
| 74 | DHG Finsbury Park Limited Hotels and similar accommodation | -£875 2020 accounts | — |
| 75 | C3 456 Limited Activities of other holding companies n.e.c. | -£102.0k 2025 accounts | — |
| 76 | N3rgy Data Limited Other information technology service activities | -£159.0k 2021 accounts | — |
| 77 | Neos 1 Ltd Licensed clubs | -£174.4k 2023 accounts | — |
| 78 | Hopedale Wales Limited Residential care activities for learning difficulties, mental health and substance abuse | -£273.1k | — |
| 79 | Heatherwood Court Limited Hospital activities Turnover £8.4M | -£1.5M | £8.4M |
| 80 | Kocho Group Limited Information technology consultancy activities Turnover £18.8M | -£5.8M 2024 accounts | £18.8M |
| 81 | Orbis Education and Care Midco Limited Residential care activities for learning difficulties, mental health and substance abuse | -£10.6M | — |
| 82 | Digital Asset Services Ltd Other service activities n.e.c. | -£18.1M | — |
| 83 | Norway Topco Limited Activities of other holding companies n.e.c. | — | — |
| 84 | Waverley Bidco Limited Activities of other holding companies n.e.c. | — | — |
| 85 | Waverley Midco 2 Limited Activities of other holding companies n.e.c. | — | — |
| 86 | Waverley Midco 1 Limited Activities of other holding companies n.e.c. | — | — |
| 87 | Waverley Topco Limited Activities of other holding companies n.e.c. | — | — |
| 88 | Cavc Campus Limited Development of building projects | — | — |
| 89 | Cavc Campus Holding Limited Activities of construction holding companies | — | — |
| 90 | Capital Law Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 91 | Avantis Group Topco Limited Activities of other holding companies n.e.c. | — | — |
| 92 | CPP Laguna Limited Hotels and similar accommodation | — | — |
| 93 | V Topco Limited Activities of other holding companies n.e.c. | — | — |
| 94 | Iris Care Group Midco 2 Limited Activities of other holding companies n.e.c. | — | — |
| 95 | Sma Debtco Limited Other business support service activities n.e.c. | — | — |
| 96 | Euro Commercials Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 97 | Utc Investments Limited Activities of other holding companies n.e.c. | — | — |
| 98 | UK Mortgage Lending Treasury Holdings Limited Activities of mortgage finance companies | — | — |
| 99 | UK Residential Mortgages Limited Activities of mortgage finance companies | — | — |
| 100 | UK Seconds Lending Limited Activities of mortgage finance companies | — | — |
| 101 | Beacon Solar Limited Production of electricity | — | — |
| 102 | AL13 Group Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 103 | Galileo Empower Renewables Limited Production of electricity | — | — |
| 104 | Neos Holdco Ltd Activities of head offices Turnover £919.7k | — 2024 accounts | £919.7k |
| 105 | Neos Topco Ltd Activities of other holding companies n.e.c. | — | — |
| 106 | White Dove Group Limited Activities of other holding companies n.e.c. | — 2024 accounts | — |
| 107 | Sienna Midco 2 Limited Activities of other holding companies n.e.c. | — | — |
| 108 | Acuity Law Holdings Limited Activities of other holding companies n.e.c. | — 2024 accounts | — |
| 109 | Galileo 14 Limited Production of electricity | — | — |
| 110 | DHG Phoenix Limited Buying and selling of own real estate | — | — |
| 111 | UK Frisbee Debtco Limited Other business support service activities n.e.c. | — | — |
| 112 | Whoniverse2 Ltd Television programme production activities | — | — |
| 113 | BP Inv6 Bidco Limited Activities of construction holding companies | — | — |
| 114 | DHG Castle Ltd Hotels and similar accommodation | — | — |
| 115 | RJW Ventures Limited Activities of other holding companies n.e.c. | — | — |
| 116 | Interbridge Mortgages Holdings Limited Activities of financial services holding companies | — 2023 accounts | — |
| 117 | Galileo 09 Limited Production of electricity | — | — |
| 118 | Galileo 06 Limited Production of electricity | — | — |
| 119 | Galileo 08 Limited Production of electricity | — | — |
| 120 | Indigo 123 Limited Activities of other holding companies n.e.c. | — | — |
| 121 | RDX Holdings Ltd Other information technology service activities | — | — |
| 122 | Interbridge Mortgages Limited Activities of mortgage finance companies | — | — |
| 123 | Dale Services Group Limited Activities of construction holding companies | — 2024 accounts | — |
| 124 | Eagle Football Holdings Midco Limited Activities of venture and development capital companies | — | — |
| 125 | Avantis Group Investments Holdco Ltd Environmental consulting activities | — 2024 accounts | — |
| 126 | Galileo 03 Limited Production of electricity | — | — |
| 127 | Flintshire Schools Holdings Limited Activities of construction holding companies | — | — |
| 128 | Flintshire Schools Limited Development of building projects | — | — |
| 129 | RCT 1 Holdings Limited Activities of construction holding companies | — | — |
| 130 | RCT 1 Limited Development of building projects | — | — |
| 131 | Hercules Technologies Bidco Limited Activities of other holding companies n.e.c. | — | — |
| 132 | Hercules Technologies Topco Limited Activities of other holding companies n.e.c. | — | — |
| 133 | Catsci Invest Ltd Activities of other holding companies n.e.c. | — | — |
| 134 | Tampa 123 Limited Activities of other holding companies n.e.c. | — | — |
| 135 | Pepper India Financial Holdings No1 Limited Activities of financial services holding companies | — | — |
| 136 | Pepper India Financial Holdings Limited Activities of financial services holding companies | — | — |
| 137 | Dragon UK Holdco Limited Activities of other holding companies n.e.c. | — | — |
| 138 | Flyform Group Ltd Activities of other holding companies n.e.c. | — | — |
| 139 | Rka Cardiff Holdings Limited Activities of other holding companies n.e.c. | — 2024 accounts | — |
| 140 | Bbi Solutions Group Limited Activities of other holding companies n.e.c. | — | — |
| 141 | Evans Electrical Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 142 | Baduhenna Bidco Limited Activities of other holding companies n.e.c. | — | — |
| 143 | Baduhenna Holdco Limited Activities of other holding companies n.e.c. | — | — |
| 144 | Madison LC1 Limited Credit granting by non-deposit taking finance houses and other specialist consumer credit grantors | — | — |
| 145 | Galileo Empower Wales Limited Production of electricity | — | — |
| 146 | Orchard Media and Events Group Investments Ltd Other business support service activities n.e.c. | — | — |
| 147 | G.E. Smart (Holdings) Limited Activities of other holding companies n.e.c. | — | — |
| 148 | Learna Holdings Limited Post-graduate level higher education | — | — |
| 149 | Sonovate International Holdings Limited Business and domestic software development | — | — |
| 150 | Kocho Group Holdings Limited Activities of other holding companies n.e.c. | — 2024 accounts | — |
| 151 | Biozone Scientific Group Limited Activities of other holding companies n.e.c. | — | — |
| 152 | C3 123 Limited Activities of other holding companies n.e.c. | — | — |
| 153 | Macron Sportswear UK Ltd Wholesale of clothing and footwear | — | — |
| 154 | Dorenell Windfarm Extension Limited Production of electricity | — | — |
| 155 | Spectrum Fibre Limited Wired telecommunications activities | — | — |
| 156 | Borley Holdings Limited Activities of construction holding companies | — 2020 accounts | — |
| 157 | Spectrum Fibre Midco Limited Fund management activities | — | — |
| 158 | Spectrum Fibre Holdco Limited Fund management activities | — | — |
| 159 | Sma Bidco Limited Other business support service activities n.e.c. | — | — |
| 160 | Dragon (Holdco) Limited Fund management activities | — | — |
| 161 | Sma Midco Limited Other business support service activities n.e.c. | — | — |
| 162 | Bute Energy (Cambria) Limited Production of electricity | — 2023 accounts | — |
| 163 | Tenby Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 164 | Dimensions Cymru Limited Residential nursing care facilities | — | — |
| 165 | Bute Energy Limited Production of electricity | — | — |
| 166 | Pepper Global EU Holdco Limited Activities of financial services holding companies | — 2020 accounts | — |
| 167 | Signature Property Finance Holdings Ltd Activities of financial services holding companies | — | — |
| 168 | Creditsafe Services Limited Other business support service activities n.e.c. | — | — |
| 169 | Avrc Ltd Activities of other holding companies n.e.c. | — | — |
| 170 | Salisbury Bidco Limited Other business support service activities n.e.c. | — | — |
| 171 | Ligtas Limited Management consultancy activities other than financial management | — | — |
| 172 | Streambank PLC Banks | — 2020 accounts | — |
| 173 | Welsh Fire (The Hundred) Limited Other sports activities | — | — |
| 174 | DWR Cymru (Financing) UK PLC Other business support service activities n.e.c. | — | — |
| 175 | Gofer Mining PLC Mining of other non-ferrous metal ores | — | — |
| 176 | Cardiff Rugby Club Limited Other sports activities | — 2024 accounts | — |
| 177 | Parkgate Hotel Cardiff Limited Development of building projects | — | — |
| 178 | Howells Legal (Holdings) Two Limited Activities of other holding companies n.e.c. | — | — |
| 179 | Raglan House Holdings Limited Activities of other holding companies n.e.c. | — 2024 accounts | — |
| 180 | Silver Fox Acquisitions Ltd Other retail sale of food in specialised stores | — | — |
| 181 | Furat Acquisitions Ltd Other retail sale of food in specialised stores | — | — |
| 182 | Motonovo Finance Limited Credit granting by non-deposit taking finance houses and other specialist consumer credit grantors | — | — |
| 183 | Wild Water Cold Storage Ltd Operation of warehousing and storage facilities for land transport activities | — 2022 accounts | — |
| 184 | Tough Limited Operation of warehousing and storage facilities for land transport activities | — | — |
| 185 | Carter Lauren Construction (Holdings) Limited Dormant Company | — | — |
| 186 | Pepper Money Group Limited Activities of financial services holding companies | — | — |
| 187 | Pepper Money Limited Activities of mortgage finance companies | — | — |
| 188 | B.R.A.I.N. Biotechnology Research and Information Network UK 2 Limited Activities of other holding companies n.e.c. | — | — |
| 189 | Acorns (Holdings) Limited Other business support service activities n.e.c. | — | — |
| 190 | Aisymmetrix Ltd Engineering related scientific and technical consulting activities | — | — |
| 191 | Heor Holdings Limited Other business support service activities n.e.c. | — 2023 accounts | — |
| 192 | Wild Water Warehousing Limited Operation of warehousing and storage facilities for land transport activities | — 2022 accounts | — |
| 193 | Pepper Cyprus Holdings Limited Activities of financial services holding companies | — | — |
| 194 | Scenic Topco Limited Repair of computers and peripheral equipment | — | — |
| 195 | Sero Technologies Limited Other professional, scientific and technical activities n.e.c. | — 2024 accounts | — |
| 196 | SCS Engineering Limited Engineering design activities for industrial process and production | — | — |
| 197 | Ftai Airopco UK Ltd Renting and leasing of air passenger transport equipment | — | — |
| 198 | Pepper Italian Investments Limited Activities of financial services holding companies | — | — |
| 199 | International Medical Group Holdings Limited Non-life insurance | — | — |
| 200 | Crosland Holdings Limited Other letting and operating of own or leased real estate | — | — |
| 201 | National Youth Arts Wales Performing arts | — | — |
| 202 | Croeso Pubs Ltd Other amusement and recreation activities n.e.c. | — 2023 accounts | — |
| 203 | T2 Group Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 204 | Shurooq Limited Hotels and similar accommodation | — | — |
| 205 | Orbis Education and Care Finco Limited Residential care activities for learning difficulties, mental health and substance abuse | — | — |
| 206 | Orbis Education and Care Topco Limited Activities of other holding companies n.e.c. | — | — |
| 207 | Admiral Financial Services Limited Other credit granting n.e.c. | — | — |
| 208 | Pepper Money Holdings Limited Activities of financial services holding companies | — | — |
| 209 | Pioneer UK Holdings Limited Manufacture of basic pharmaceutical products | — | — |
| 210 | Pioneer UK Midco 2 Limited Manufacture of basic pharmaceutical products | — | — |
| 211 | Pioneer UK Midco 1 Limited Manufacture of basic pharmaceutical products | — | — |
| 212 | SRD (Management) Limited Human resources provision and management of human resources functions | — | — |
| 213 | SRD (Trading) Limited Hotels and similar accommodation | — | — |
| 214 | Rightacres Property Group Limited Other letting and operating of own or leased real estate | — | — |
| 215 | Glas Cymru Holdings Cyfyngedig Water collection, treatment and supply | — | — |
| 216 | WMC Productions Limited Operation of arts facilities | — | — |
| 217 | Cardo Group Limited Activities of construction holding companies | — 2023 accounts | — |
| 218 | Care & Repair Cardiff and the Vale Other service activities n.e.c. | — | — |
| 219 | Veezu Holdings Limited Taxi operation | — | — |
| 220 | Centre for Digital Public Services Limited Other business support service activities n.e.c. | — | — |
| 221 | Crescentbrook Limited Hotels and similar accommodation | — | — |
| 222 | Hallowridge Limited Hotels and similar accommodation | — | — |
| 223 | Islandvale Limited Hotels and similar accommodation | — | — |
| 224 | Trackdale Limited Hotels and similar accommodation | — | — |
| 225 | Inspiretec Group Limited Activities of other holding companies n.e.c. | — | — |
| 226 | Biodexa Pharmaceuticals PLC Research and experimental development on biotechnology | — | — |
| 227 | Pci Penn UK Holdco Limited Manufacture of basic pharmaceutical products | — | — |
| 228 | Surgical Science UK Holdings Limited Activities of head offices | — | — |
| 229 | Panorama VRS Limited Repair of electrical equipment | — | — |
| 230 | Wild Water Frozen Limited Non-specialised wholesale trade | — 2022 accounts | — |
| 231 | Pharmaron UK Limited Manufacture of other organic basic chemicals | — | — |
| 232 | Lindisfarne Healthcare (Holdings) Limited Activities of other holding companies n.e.c. | — | — |
| 233 | Life Sciences Hub Wales Limited Other business support service activities n.e.c. | — | — |
| 234 | Signature Private Finance Holdings Limited Activities of financial services holding companies | — 2019 accounts | — |
| 235 | UK Mortgage Lending Ltd Credit granting by non-deposit taking finance houses and other specialist consumer credit grantors | — | — |
| 236 | Pepper Europe Investments UK Ltd Activities of financial services holding companies | — | — |
| 237 | Celtic Utilities Group Limited Activities of other holding companies n.e.c. | — 2024 accounts | — |
| 238 | SPF Bridging Ltd Activities of mortgage finance companies | — 2019 accounts | — |
| 239 | Autism Spectrum Connections Cymru Other social work activities without accommodation n.e.c. | — 2025 accounts | — |
| 240 | WGC Holdco Limited Other business support service activities n.e.c. | — | — |
| 241 | Bbi Solutions Oem Limited Manufacture of other inorganic basic chemicals | — | — |
| 242 | Welsh Water Organic Energy (Cardiff) Ltd Production of electricity | — | — |
| 243 | Welsh Water Organic Energy Ltd Production of electricity | — | — |
| 244 | Enfys Developments Limited Construction of domestic buildings | — | — |
| 245 | Kocho Holdings Limited Information technology consultancy activities | — | — |
| 246 | Wild Water Transport Limited Freight transport by road | — 2022 accounts | — |
| 247 | Alco Team Limited Freight transport by road | — 2020 accounts | — |
| 248 | Wild Water Storage Limited Operation of warehousing and storage facilities for land transport activities | — 2022 accounts | — |
| 249 | Ageas Law LLP | — | — |
| 250 | Cardiff Young Men's Christian Association Activities of other membership organizations n.e.c. | — | — |
| 251 | Brentmark Limited Activities of other holding companies n.e.c. | — | — |
| 252 | DP Shayban Limited Take-away food shops and mobile food stands | — | — |
| 253 | Pepper Europe (UK) Limited Activities of financial services holding companies | — | — |
| 254 | Millennium Stadium Experience Limited Event catering activities | — | — |
| 255 | Licentia Group Ltd Other information technology service activities | — | — |
| 256 | Admiral Law Limited Solicitors | — | — |
| 257 | Gazprom International UK Ltd. Support activities for petroleum and natural gas extraction | — | — |
| 258 | Wealthify Group Limited Activities of head offices | — | — |
| 259 | Insole Court Trust-Ymddiredolaeth CWRT Insole Other business support service activities n.e.c. | — | — |
| 260 | Itec Training Solutions (Holdings) Limited Activities of head offices | — | — |
| 261 | Vista Retail Support Holdings Limited Repair of other equipment | — | — |
| 262 | Dalata Cardiff Limited Hotels and similar accommodation | — | — |
| 263 | Resource Conversion PLC Remediation activities and other waste management services | — | — |
| 264 | Freight Systems Express (Wales) Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 265 | Advocacy Support in Cymru Ltd Other human health activities | — | — |
| 266 | Red Kite Law LLP | — 2023 accounts | — |
| 267 | Sonovate Limited Business and domestic software development | — | — |
| 268 | Deep Black Drilling LLP | — | — |
| 269 | Cansford Laboratories Limited Other human health activities | — | — |
| 270 | Criseren Foods Limited Manufacture of other food products n.e.c. | — | — |
| 271 | Career Choices Dewis Gyrfa Ltd. Other business support service activities n.e.c. | — | — |
| 272 | Sphere Projects Ltd Activities of other holding companies n.e.c. | — | — |
| 273 | Lexisnexis Risk Solutions UK Limited Other information technology service activities | — | — |
| 274 | Cambria Maintenance Services Limited Other business support service activities n.e.c. | — | — |
| 275 | Cardiff University Students' Union First-degree level higher education | — | — |
| 276 | Idwal Marine Services Limited Sea and coastal freight water transport | — | — |
| 277 | Resource R8 Limited Other letting and operating of own or leased real estate | — 2024 accounts | — |
| 278 | Criseren Limited Activities of head offices | — | — |
| 279 | Newlaw Legal Limited Solicitors | — | — |
| 280 | Food Redistribution Wales Limited Other food services | — | — |
| 281 | Pockit Limited Other service activities n.e.c. | — | — |
| 282 | Oakville (South Wales) Limited Activities of other holding companies n.e.c. | — | — |
| 283 | Oprema Limited Wholesale of other machinery and equipment | — | — |
| 284 | Dauson Environmental Group Limited Activities of head offices | — | — |
| 285 | Cardiff Met Students' Union Educational support services | — | — |
| 286 | Geldards Resources Limited Human resources provision and management of human resources functions | — | — |
| 287 | Carron Energy Limited Production of electricity | — | — |
| 288 | Hotel LA Tour Birmingham Limited Hotels and similar accommodation | — | — |
| 289 | Intermarine UK Limited Other engineering activities | — 2023 accounts | — |
| 290 | Euro Commercials (South West) Ltd Sale of new cars and light motor vehicles | — 2024 accounts | — |
| 291 | Firing Line Ltd Other business support service activities n.e.c. | — | — |
| 292 | Surehaven Glasgow Limited Residential nursing care facilities | — | — |
| 293 | Team Collective Cymru Charity Performing arts | — | — |
| 294 | BRC Limited Manufacture of other fabricated metal products n.e.c. | — | — |
| 295 | Dalata UK Ltd Hotels and similar accommodation | — | — |
| 296 | International Baccalaureate Organization (UK) Limited Other business support service activities n.e.c. | — | — |
| 297 | Pepper Group Anz Holdco Limited Activities auxiliary to financial intermediation n.e.c. | — | — |
| 298 | L. H. Evans Holdings Limited Activities of head offices | — 2025 accounts | — |
| 299 | Promo-Cymru Trading Limited Other information service activities n.e.c. | — | — |
| 300 | Leading Edge Group (UK) Limited Other business support service activities n.e.c. | — | — |