| 1 | Mediatek Global Holdings Limited Activities of other holding companies n.e.c. | £4.1bn 2024 accounts | — |
| 2 | CGNM UK Ltd. Other service activities n.e.c. Turnover £250.1M | £274.6M | £250.1M |
| 3 | Dr Reddy's Laboratories (UK) Limited Manufacture of pharmaceutical preparations Turnover £95.0M | £62.1M | £95.0M |
| 4 | Cytocell Limited Other human health activities Turnover £15.5M | £42.7M | £15.5M |
| 5 | CGN Global Uranium Limited Agents involved in the sale of fuels, ores, metals and industrial chemicals Turnover £644.1M | £41.1M | £644.1M |
| 6 | The Fellows House Limited Hotels and similar accommodation | £38.3M | — |
| 7 | Synexus Clinical Research Midco No 1 Limited Other professional, scientific and technical activities n.e.c. | £29.9M 2022 accounts | — |
| 8 | Casella Family Brands (Europe) Limited Wholesale of wine, beer, spirits and other alcoholic beverages | £23.9M | — |
| 9 | Inca Digital Printers Limited Manufacture of other special-purpose machinery n.e.c. | £18.9M 2024 accounts | — |
| 10 | South Cambs Limited Other letting and operating of own or leased real estate Turnover £9.5M | £15.7M | £9.5M |
| 11 | Envea UK Ltd Manufacture of electronic measuring, testing etc. equipment, not for industrial process control | £15.0M | — |
| 12 | Turnstone Estates Limited Other letting and operating of own or leased real estate | £13.0M 2024 accounts | — |
| 13 | Cambustion Limited Manufacture of other special-purpose machinery n.e.c. Turnover £10.6M | £12.5M 2023 accounts | £10.6M |
| 14 | Huber+suhner Polatis Limited Manufacture of optical precision instruments Turnover £22.7M | £12.2M | £22.7M |
| 15 | Ham-Let CFS Ltd Manufacture of other special-purpose machinery n.e.c. Turnover £26.6M | £11.5M | £26.6M |
| 16 | G. Webb Haulage Limited Agents involved in the sale of timber and building materials Turnover £23.0M | £9.4M | £23.0M |
| 17 | Thermoteknix Systems Limited Manufacture of other special-purpose machinery n.e.c. Turnover £14.3M | £8.3M | £14.3M |
| 18 | Novogene (UK) Company Limited Research and experimental development on biotechnology | £8.1M 2024 accounts | — |
| 19 | Møller Institute Limited Hotels and similar accommodation Turnover £5.2M | £7.8M 2023 accounts | £5.2M |
| 20 | Insignis Asset Management Limited Business and domestic software development Turnover £20.5M | £7.4M | £20.5M |
| 21 | Vision Architectural Glazing Installations Limited Glazing | £6.8M | — |
| 22 | CN Bio Innovations Limited Manufacture of electronic measuring, testing etc. equipment, not for industrial process control Turnover £2.1M | £5.9M 2022 accounts | £2.1M |
| 23 | Bradnam Joinery Limited Manufacture of other products of wood; manufacture of articles of cork, straw and plaiting materials Turnover £10.1M | £5.8M | £10.1M |
| 24 | Cambridge United Football Club Limited Operation of sports facilities | £5.8M | — |
| 25 | Alfasigma UK Limited Other professional, scientific and technical activities n.e.c. Turnover £20.5M | £4.7M 2023 accounts | £20.5M |
| 26 | Gas Management Services Limited Other professional, scientific and technical activities n.e.c. Turnover £13.2M | £4.7M 2020 accounts | £13.2M |
| 27 | 42 Technology Limited Other research and experimental development on natural sciences and engineering | £4.7M 2024 accounts | — |
| 28 | North Star Opco Limited Wholesale of pharmaceutical goods Turnover £0 | £4.6M | £0 |
| 29 | Innovia Technology Limited Management consultancy activities other than financial management | £4.6M 2023 accounts | — |
| 30 | Altium UK Limited Other retail sale not in stores, stalls or markets Turnover £18.9M | £4.1M | £18.9M |
| 31 | Synexus Limited Other professional, scientific and technical activities n.e.c. Turnover £20.6M | £4.0M 2022 accounts | £20.6M |
| 32 | Premier Holidays Limited Tour operator activities Turnover £45.5M | £3.9M | £45.5M |
| 33 | MM Wealth Ltd Other business support service activities n.e.c. Turnover £6.8M | £3.6M | £6.8M |
| 34 | Nason Davis Limited Agents involved in the sale of timber and building materials | £3.4M | — |
| 35 | Welch's Transport Limited Freight transport by road Turnover £15.0M | £3.3M 2024 accounts | £15.0M |
| 36 | Dockerill Groundworks Ltd Construction of domestic buildings | £2.9M | — |
| 37 | Advent Bioservices Ltd Manufacture of pharmaceutical preparations | £2.9M | — |
| 38 | Viridian Solar Limited Other manufacturing n.e.c. | £2.5M 2019 accounts | — |
| 39 | Blayson - Olefines Limited Other manufacturing n.e.c. | £2.1M | — |
| 40 | Foundries.Io Limited Other software publishing | £2.0M 2019 accounts | — |
| 41 | Premier Travel Agency Limited Travel agency activities Turnover £7.7M | £2.0M | £7.7M |
| 42 | Secure Thingz Limited Business and domestic software development | £1.9M | — |
| 43 | Encore Estate Management Limited Management of real estate on a fee or contract basis | £1.7M 2020 accounts | — |
| 44 | Baufritz (UK) Ltd. Construction of domestic buildings | £1.1M 2024 accounts | — |
| 45 | Cambridgeshire Deaf Association Ltd Other social work activities without accommodation n.e.c. | £1.0M 2020 accounts | — |
| 46 | Iguana Investments Ltd Fund management activities | £917.1k 2020 accounts | — |
| 47 | Cambridge Spark Limited Other education n.e.c. | £898.5k 2021 accounts | — |
| 48 | World Sugar Research Organisation Limited Other research and experimental development on natural sciences and engineering Turnover £549.3k | £810.8k | £549.3k |
| 49 | Lunchtime Company Ltd Event catering activities Turnover £15.5M | £730.0k 2024 accounts | £15.5M |
| 50 | Atlanticomnium (UK) Limited Fund management activities Turnover £1.1M | £724.1k 2023 accounts | £1.1M |
| 51 | Newton Technology Group PLC Activities of head offices | £675.0k 2024 accounts | — |
| 52 | Kale & Damson Limited Wholesale of fruit and vegetables Turnover £12.0M | £604.1k 2024 accounts | £12.0M |
| 53 | Shire Homes Lettings Limited Other letting and operating of own or leased real estate Turnover £1.4M | £592.0k | £1.4M |
| 54 | Trilogy Writing & Consulting Limited Other professional, scientific and technical activities n.e.c. | £548.7k 2023 accounts | — |
| 55 | Talga Technologies Limited Other business support service activities n.e.c. Turnover £245.3k | £482.6k 2021 accounts | £245.3k |
| 56 | Genie Shopping Ltd Retail sale via mail order houses or via Internet | £375.0k 2022 accounts | — |
| 57 | Cambourne Business Park Limited Other business support service activities n.e.c. | £361.7k | — |
| 58 | Astellas Engineered Small Molecules U.K. Limited Other professional, scientific and technical activities n.e.c. | £312.2k 2020 accounts | — |
| 59 | Portal Estate Management Ltd Other letting and operating of own or leased real estate Turnover £1.3M | £282.5k 2021 accounts | £1.3M |
| 60 | 24I Unit Media Limited Business and domestic software development | £227.8k 2021 accounts | — |
| 61 | Alpha Investment Office Limited Financial intermediation not elsewhere classified | £167.5k 2025 accounts | — |
| 62 | Rio Capital Advisers Ltd Fund management activities | £152.7k 2021 accounts | — |
| 63 | Regatta Topco Limited Activities of other holding companies n.e.c. Turnover £0 | £133.5k 2024 accounts | £0 |
| 64 | Vision Park Management Limited Buying and selling of own real estate Turnover £232.5k | £85.3k 2024 accounts | £232.5k |
| 65 | Cambridge Sustainability Limited Other education n.e.c. Turnover £0 | £8.9k 2021 accounts | £0 |
| 66 | Lodge Property Services Ltd Other letting and operating of own or leased real estate Turnover £7.6M | £0 2021 accounts | £7.6M |
| 67 | Core Sustainable Heat Management Limited Plumbing, heat and air-conditioning installation Turnover £590.4k | -£68.8k 2021 accounts | £590.4k |
| 68 | Global Inkjet Systems Limited Other information technology service activities Turnover £10.3M | -£2.2M 2024 accounts | £10.3M |
| 69 | Flusso Limited Other research and experimental development on natural sciences and engineering Turnover £558 | -£2.8M | £558 |
| 70 | Synexus Clinical Research Limited Other professional, scientific and technical activities n.e.c. Turnover £76.4M | -£12.1M 2022 accounts | £76.4M |
| 71 | Marshall Land Systems Ltd Manufacture of bodies (coachwork) for motor vehicles (except caravans) Turnover £62.6M | -£30.4M | £62.6M |
| 72 | Wild Lives Earth Limited Other service activities n.e.c. | — | — |
| 73 | Pure Resourcing Solutions Group Ltd Other activities of employment placement agencies | — | — |
| 74 | Fitzwilliam College Developments Limited Development of building projects | — | — |
| 75 | The Arts Theatre Cambridge Operation of arts facilities | — | — |
| 76 | Acquisan Limited Activities of other holding companies n.e.c. | — | — |
| 77 | Roskel Holdings 2024 Limited Other building completion and finishing | — | — |
| 78 | Howard Commercial Holdings Limited Other letting and operating of own or leased real estate | — | — |
| 79 | CGS UK Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 80 | Teraview Holdings PLC Manufacture of electronic industrial process control equipment | — | — |
| 81 | Qualcomm Auto Ltd. Business and domestic software development | — | — |
| 82 | Qualcomm UK International Technologies Holdings Ltd. Activities of other holding companies n.e.c. | — | — |
| 83 | Qualcomm UK International Technologies Ltd. Activities of other holding companies n.e.c. | — | — |
| 84 | G. Webb Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 85 | Darktrace Bidco Limited Activities of other holding companies n.e.c. | — | — |
| 86 | Darktrace Midco I Limited Activities of other holding companies n.e.c. | — | — |
| 87 | Aloha Topco Limited Other business support service activities n.e.c. | — | — |
| 88 | Raspberry PI Holdings PLC Other professional, scientific and technical activities n.e.c. | — | — |
| 89 | Evinova Limited Information technology consultancy activities | — | — |
| 90 | TT Secure Platform Limited Business and domestic software development | — | — |
| 91 | Caec Howard Limited Buying and selling of own real estate | — | — |
| 92 | Vision Arch Holdings Ltd Construction of commercial buildings | — | — |
| 93 | Qualcomm Services Ltd Business and domestic software development | — | — |
| 94 | Acapo Onsagers UK Ltd Activities of patent and copyright agents; other legal activities n.e.c. | — 2024 accounts | — |
| 95 | Coulson Group (Cowley Road) Ltd Other letting and operating of own or leased real estate | — | — |
| 96 | Infinite Electronics U.K. Holdco Limited Manufacture of electronic components | — | — |
| 97 | Syskit UK Limited Business and domestic software development | — 2022 accounts | — |
| 98 | MM Wealth Group Holdings Ltd Activities of other holding companies n.e.c. | — | — |
| 99 | Andromeda Capital Management (UK) LLP | — | — |
| 100 | Abbey DLD Colleges Limited General secondary education | — | — |
| 101 | Sepura Holdings Limited Financial intermediation not elsewhere classified | — | — |
| 102 | Sword Lowco Limited Financial intermediation not elsewhere classified | — | — |
| 103 | Sword Midco Limited Financial intermediation not elsewhere classified | — | — |
| 104 | Sword Topco Limited Financial intermediation not elsewhere classified | — | — |
| 105 | Pretoria Energy Group Limited Other manufacturing n.e.c. | — 2024 accounts | — |
| 106 | King's College School, Cambridge Pre-primary education | — | — |
| 107 | Superdielectrics Group PLC Other research and experimental development on natural sciences and engineering | — | — |
| 108 | Pure Holdings Group Co Ltd Other activities of employment placement agencies | — | — |
| 109 | Raspberry PI Mid Co Limited Non-trading company | — | — |
| 110 | Raptor Bidco Limited Activities of financial services holding companies | — | — |
| 111 | Raptor Midco 1 Limited Activities of financial services holding companies | — | — |
| 112 | Raptor Midco 2 Limited Activities of financial services holding companies | — | — |
| 113 | Raptor Topco Limited Activities of financial services holding companies | — | — |
| 114 | Chaleit Holdings PLC Information technology consultancy activities | — | — |
| 115 | Apollo Therapeutics Limited Activities of other holding companies n.e.c. | — | — |
| 116 | St John's College School, Cambridge Pre-primary education | — | — |
| 117 | Apollo Therapeutics Group Limited Activities of other holding companies n.e.c. | — | — |
| 118 | Sitala Bio Ltd Research and experimental development on biotechnology | — | — |
| 119 | Albanwise Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 120 | Edx Medical Group PLC Activities of venture and development capital companies | — | — |
| 121 | Darktrace Limited Business and domestic software development | — | — |
| 122 | Optibrium Topco Limited Activities of other holding companies n.e.c. | — | — |
| 123 | Ventress Holdings Ltd Hotels and similar accommodation | — | — |
| 124 | Bourn Hall Holdings Limited Activities of head offices | — | — |
| 125 | Bourn Hall Investments Limited Activities of head offices | — | — |
| 126 | Hitgen UK Ltd Activities of other holding companies n.e.c. | — | — |
| 127 | June UK Finco Limited Activities of other holding companies n.e.c. | — | — |
| 128 | Kigen (UK) Limited Business and domestic software development | — 2021 accounts | — |
| 129 | The Trinity Challenge Other human health activities | — | — |
| 130 | Monavate Holdings Limited Management consultancy activities other than financial management | — | — |
| 131 | Cycle Group Holdings Limited Manufacture of basic pharmaceutical products | — | — |
| 132 | Foodco UK Holdings Ltd Activities of other holding companies n.e.c. | — | — |
| 133 | Dunad Therapeutics Ltd. Research and experimental development on biotechnology | — | — |
| 134 | Innovate Cambridge Ltd Other professional, scientific and technical activities n.e.c. | — | — |
| 135 | Astrea Group Holdings Company Limited Activities of other holding companies n.e.c. | — | — |
| 136 | Monavate Ltd Financial intermediation not elsewhere classified | — | — |
| 137 | 42 Technology Group Limited Activities of head offices | — 2024 accounts | — |
| 138 | Kirontech UK Holding Ltd Activities of other holding companies n.e.c. | — 2022 accounts | — |
| 139 | Genie Shopping (Holdings) Ltd Retail sale via mail order houses or via Internet | — | — |
| 140 | Skerryvore AM LLP | — | — |
| 141 | Regatta Bidco Limited Activities of other holding companies n.e.c. | — | — |
| 142 | Regatta Holdco Limited Activities of other holding companies n.e.c. | — | — |
| 143 | Regatta Midco Limited Activities of other holding companies n.e.c. | — | — |
| 144 | 24I Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 145 | PPD International Holdings (UK) Ltd. Activities of other holding companies n.e.c. | — | — |
| 146 | Granicus Bidco Limited Non-trading company | — | — |
| 147 | Nyobolt Limited Other research and experimental development on natural sciences and engineering | — 2021 accounts | — |
| 148 | Albanwise Wallace Estates Limited Activities of other holding companies n.e.c. | — | — |
| 149 | Lightcast Discovery Ltd Research and experimental development on biotechnology | — 2024 accounts | — |
| 150 | Aveva Financing Limited Business and domestic software development | — | — |
| 151 | Mediatek Research UK Limited Wireless telecommunications activities | — | — |
| 152 | Iliffe Media Group Limited Activities of other holding companies n.e.c. | — | — |
| 153 | F-Star Therapeutics Limited Research and experimental development on biotechnology | — | — |
| 154 | Astro Bidco Limited Activities of other holding companies n.e.c. | — | — |
| 155 | Bright Scholar (UK) Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 156 | Cyted Ltd Specialists medical practice activities | — 2020 accounts | — |
| 157 | Apeva Holdings Ltd. Activities of other holding companies n.e.c. | — | — |
| 158 | Triumph Holdings Limited Activities of other holding companies n.e.c. | — 2024 accounts | — |
| 159 | Cambscuisine Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 160 | Arm Holdings PLC Activities of other holding companies n.e.c. | — 2021 accounts | — |
| 161 | Cambridge University International Holdings Limited Other business support service activities n.e.c. | — | — |
| 162 | This Land Development Limited Development of building projects | — | — |
| 163 | Quy Investments Limited Buying and selling of own real estate | — | — |
| 164 | Amphista Therapeutics Limited Research and experimental development on biotechnology | — 2021 accounts | — |
| 165 | Roskel Holdings 2017 Limited Other building completion and finishing | — | — |
| 166 | HPG Gonville Limited Buying and selling of own real estate | — | — |
| 167 | Bicycle Therapeutics PLC Other business support service activities n.e.c. | — | — |
| 168 | Bicycletx Limited Other business support service activities n.e.c. | — | — |
| 169 | Morhomes PLC Financial intermediation not elsewhere classified | — | — |
| 170 | Getbusy PLC Other software publishing | — | — |
| 171 | Services Machinery & Trucks Ltd Sale of other motor vehicles | — | — |
| 172 | Mundipharma International Technical Operations Limited Management consultancy activities other than financial management | — | — |
| 173 | Xap Therapeutics Limited Activities of venture and development capital companies | — 2019 accounts | — |
| 174 | Iliffe Media Publishing Limited Publishing of newspapers | — | — |
| 175 | Skerryvore Asset Management Ltd Other business support service activities n.e.c. | — | — |
| 176 | Addenbrooke's Charitable Trust Other social work activities without accommodation n.e.c. | — | — |
| 177 | Howard Langford Limited Other letting and operating of own or leased real estate | — | — |
| 178 | Five AI Limited Business and domestic software development | — | — |
| 179 | Fidion Limited Activities of production holding companies | — 2023 accounts | — |
| 180 | Kymab Group Limited Other business support service activities n.e.c. | — | — |
| 181 | Howard Capital Limited Activities of venture and development capital companies | — | — |
| 182 | Gearset Limited Business and domestic software development | — 2024 accounts | — |
| 183 | Red Gate Software Group Limited Business and domestic software development | — | — |
| 184 | Cerevance, Ltd Research and experimental development on biotechnology Turnover £15.2k | — | £15.2k |
| 185 | Ieso Digital Health (UK) Limited Other human health activities | — | — |
| 186 | Riverlane Ltd Other information technology service activities | — 2022 accounts | — |
| 187 | Syndicate Room Group Ltd Activities of venture and development capital companies | — | — |
| 188 | Gray's Inn Capital 2 Limited Buying and selling of own real estate | — | — |
| 189 | Ceg Digital Limited Activities of head offices | — | — |
| 190 | Cambridge City Housing Company Limited Other letting and operating of own or leased real estate Turnover £346.5k | — | £346.5k |
| 191 | Azenco4 Limited Other business support service activities n.e.c. | — | — |
| 192 | Artios Pharma Limited Research and experimental development on biotechnology | — | — |
| 193 | Rio Capital Investments Ltd Activities of other holding companies n.e.c. | — 2021 accounts | — |
| 194 | Risilience Limited Business and domestic software development | — 2020 accounts | — |
| 195 | Luminance Technologies Ltd Business and domestic software development | — 2023 accounts | — |
| 196 | Cambridge University Boat Club Activities of sport clubs | — | — |
| 197 | Howard Cambridge Limited Other letting and operating of own or leased real estate | — | — |
| 198 | O2 Worldwide Limited Other service activities n.e.c. | — | — |
| 199 | Curufc Other sports activities | — | — |
| 200 | A Colin Lunn (Tobacconist) Limited Activities of head offices | — | — |
| 201 | Focal Point Positioning Ltd. Other research and experimental development on natural sciences and engineering | — 2020 accounts | — |
| 202 | Leatherhead Research Limited Other professional, scientific and technical activities n.e.c. | — | — |
| 203 | 3DS Financial Services Ltd Activities of financial services holding companies | — | — |
| 204 | Tyndale House and Institute Library activities | — | — |
| 205 | Tullamore Investments Limited Activities of head offices | — | — |
| 206 | Cambridge Energy Limited Manufacture of other electrical equipment | — 2021 accounts | — |
| 207 | Synexus Clinical Research Topco Limited Other professional, scientific and technical activities n.e.c. | — | — |
| 208 | Nason Davis Holdings Limited Activities of head offices | — | — |
| 209 | Mundibiopharma Limited Wholesale of pharmaceutical goods | — | — |
| 210 | Mundipharma Medical Company Limited Wholesale of pharmaceutical goods | — | — |
| 211 | Cambridge University Press Operations Limited Other business support service activities n.e.c. | — | — |
| 212 | Wesley House, Cambridge Post-graduate level higher education | — | — |
| 213 | Inivata Limited Research and experimental development on biotechnology | — | — |
| 214 | Centurion Student Services (UK) Ltd Other letting and operating of own or leased real estate | — | — |
| 215 | Howard Bedford Limited Other letting and operating of own or leased real estate | — | — |
| 216 | Healx Limited Other professional, scientific and technical activities n.e.c. | — | — |
| 217 | Durman Stearn Holdings Limited Activities of construction holding companies | — 2024 accounts | — |
| 218 | Phoremost Limited Research and experimental development on biotechnology | — | — |
| 219 | Howard Residential Limited Buying and selling of own real estate | — | — |
| 220 | RCB Bonds PLC Financial intermediation not elsewhere classified | — | — |
| 221 | RC Bond Holdings Limited Activities of financial services holding companies | — | — |
| 222 | Horizon Discovery Group Limited Research and experimental development on biotechnology | — | — |
| 223 | Stemcell Technologies UK Ltd Research and experimental development on biotechnology | — 2024 accounts | — |
| 224 | Technology Sciences Group Consulting Limited Other professional, scientific and technical activities n.e.c. | — | — |
| 225 | CMR Surgical Limited Manufacture of medical and dental instruments and supplies | — | — |
| 226 | Cambridge Colleges Funding II PLC Other credit granting n.e.c. | — | — |
| 227 | Camelot Holdco Limited Activities of other holding companies n.e.c. | — | — |
| 228 | Camelot Midco Limited Activities of other holding companies n.e.c. | — | — |
| 229 | Camelot Topco Limited Activities of other holding companies n.e.c. | — | — |
| 230 | Bluestone Investment Holdings Limited Activities of open-ended investment companies | — | — |
| 231 | Biosceptre International Limited Research and experimental development on biotechnology | — | — |
| 232 | Storey's Field Community Trust Other amusement and recreation activities n.e.c. | — | — |
| 233 | Nuclera Ltd Research and experimental development on biotechnology | — 2021 accounts | — |
| 234 | Bluescientific Limited Other professional, scientific and technical activities n.e.c. | — | — |
| 235 | Cambridge Colleges Funding PLC Other credit granting n.e.c. | — | — |
| 236 | Darktrace Holdings Limited Business and domestic software development | — | — |
| 237 | Uts Cambridge Primary education | — | — |
| 238 | Superdielectrics Ltd Other research and experimental development on natural sciences and engineering | — | — |
| 239 | Eastern Academic Health Science Network Hospital activities | — | — |
| 240 | Izilla Limited Retail sale via mail order houses or via Internet | — | — |
| 241 | Proquest European Holdings Limited Other publishing activities | — | — |
| 242 | Aveva Finance Limited Business and domestic software development | — | — |
| 243 | Stobbs (IP) Ltd Activities of patent and copyright agents; other legal activities n.e.c. | — | — |
| 244 | Velocity Outlet Ltd Retail sale via mail order houses or via Internet | — | — |
| 245 | Jamaica Blue Limited Licensed restaurants | — | — |
| 246 | Comar Investments Limited Other professional, scientific and technical activities n.e.c. | — 2022 accounts | — |
| 247 | Rxcelerate Limited Research and experimental development on biotechnology | — | — |
| 248 | Cambridge Innovation Capital Limited Activities of other holding companies n.e.c. | — | — |
| 249 | Samsung Cambridge Solution Centre Limited Wireless telecommunications activities | — | — |
| 250 | Cambridge Cognition Holdings PLC Activities of other holding companies n.e.c. | — | — |
| 251 | Raspberry PI Ltd Other professional, scientific and technical activities n.e.c. | — | — |
| 252 | Abcam (US) Ltd Activities of other holding companies n.e.c. | — | — |
| 253 | Anglia Ruskin Students' Union Activities of other membership organizations n.e.c. | — | — |
| 254 | PPD International Investments Limited Non-trading company | — | — |
| 255 | St Bede's Inter Church School General secondary education | — | — |
| 256 | Cycle Pharmaceuticals Ltd Manufacture of basic pharmaceutical products | — | — |
| 257 | Skin Analytics Ltd Business and domestic software development | — 2025 accounts | — |
| 258 | Eastern Learning Alliance Primary education | — | — |
| 259 | Trustonic Limited Business and domestic software development | — | — |
| 260 | Wallace Partnership Reversionary Group Holdings Limited Buying and selling of own real estate | — | — |
| 261 | Qdem Pharmaceuticals Limited Wholesale of pharmaceutical goods | — | — |
| 262 | Wildcat Acquisition Holdings (UK) Limited Activities of other holding companies n.e.c. | — | — |
| 263 | Bourn Church of England Primary Academy Primary education | — 2021 accounts | — |
| 264 | Wallace Partnership Group Limited Buying and selling of own real estate | — | — |
| 265 | The Leys and St Faith's Schools Foundation Primary education | — | — |
| 266 | Syndicate Room Ltd Financial intermediation not elsewhere classified | — | — |
| 267 | Mission Therapeutics Limited Research and experimental development on biotechnology | — | — |
| 268 | Cambridge Intelligence Limited Information technology consultancy activities | — 2021 accounts | — |
| 269 | Cambridge Silicon Radio Holdings Limited Activities of other holding companies n.e.c. | — | — |
| 270 | Digital Services Cambridge Limited Other information technology service activities | — | — |
| 271 | Anglian Learning Primary education | — | — |
| 272 | Mundipharma It Services Limited Other information technology service activities | — | — |
| 273 | Rcma Services (UK) Limited Other business support service activities n.e.c. | — | — |
| 274 | Howard Sawston Ltd Other letting and operating of own or leased real estate | — | — |
| 275 | Pragmatic Semiconductor Limited Manufacture of electronic components | — | — |
| 276 | Huawei Technologies Research & Development (UK) Limited Wireless telecommunications activities | — | — |
| 277 | Linaro Limited Other software publishing | — | — |
| 278 | GB Social Housing PLC Credit granting by non-deposit taking finance houses and other specialist consumer credit grantors | — | — |
| 279 | Osisoft (UK) Limited Other information technology service activities | — | — |
| 280 | PPD CT Investments LLP | — | — |
| 281 | The Cambridge Union Society Cultural education | — | — |
| 282 | Arthur Rank Hospice Charity Hospital activities | — | — |
| 283 | Brookgate Limited Other business support service activities n.e.c. | — | — |
| 284 | Kymab Limited Other professional, scientific and technical activities n.e.c. | — | — |
| 285 | Bicyclerd Limited Other business support service activities n.e.c. | — | — |
| 286 | Vet CT Specialists Ltd. Veterinary activities | — 2024 accounts | — |
| 287 | Arcus Global Limited General public administration activities | — 2024 accounts | — |
| 288 | The C3 Church Activities of religious organizations | — 2024 accounts | — |
| 289 | Girton Town Charity Other business support service activities n.e.c. | — | — |
| 290 | University of Cambridge Investment Management Limited Fund management activities | — | — |
| 291 | U-Blox Cambridge Ltd Wireless telecommunications activities | — | — |
| 292 | Bidwells LLP | — | — |
| 293 | Chalkhill Partners LLP | — | — |
| 294 | Cambridge in America (UK) Limited Other business support service activities n.e.c. | — | — |
| 295 | Cambridge Design Partnership Limited Other professional, scientific and technical activities n.e.c. | — 2021 accounts | — |
| 296 | Expedeon Holdings Limited Other professional, scientific and technical activities n.e.c. | — | — |
| 297 | GSL Dardan Holdings Limited Private security activities | — 2020 accounts | — |
| 298 | Raspberry PI Foundation Other professional, scientific and technical activities n.e.c. | — | — |
| 299 | Costello Medical Consulting Limited Other professional, scientific and technical activities n.e.c. | — | — |
| 300 | Howard Regent Limited Other letting and operating of own or leased real estate | — | — |