| 126 | The Study Preparatory School | 303 pupils | Independent · Day | London, London | — ISI · Good |
| 127 | Holy Cross Preparatory School | 301 pupils | Independent · Day | Unknown, London | — ISI · Good |
| 128 | High March School | 300 pupils | Independent · Day | Beaconsfield, South East | — ISI · Good |
| 129 | Copthill Independent Day School & Nursery | 299 pupils | Independent · Day | Stamford, East Midlands | — ISI · Good |
| 130 | Kensington Prep School GDST | 298 pupils | Independent · Day | Unknown, London | — ISI · Good |
| 131 | Littlegarth School | 296 pupils | Independent · Day | Colchester, East of England | — ISI · Good |
| 132 | The Richard Pate School | 296 pupils | Independent · Day | Cheltenham, South West | — ISI · Good |
| 133 | Chinthurst School | 295 pupils | Independent · Day | Unknown, South East | — ISI · Good |
| 134 | Rosemead Preparatory School | 291 pupils | Independent · Day | London, London | — ISI · Good |
| 135 | Rowan Preparatory School | 286 pupils | Independent · Day | Esher, South East | — ISI · Good |
| 136 | Ashley Manor Preparatory School | 280 pupils | Independent · Day | Cheltenham, South West | — ISI · Good |
| 137 | Bowdon Preparatory School | 279 pupils | Independent · Day | Altrincham, North West | — ISI · Good |
| 138 | Upton House School | 278 pupils | Independent · Day | Berkshire, South East | — ISI · Good |
| 139 | King Edward VI Preparatory School | 276 pupils | Independent · Day | Romsey, South East | — ISI · Good |
| 140 | Truro School Preparatory School | 276 pupils | Independent · Day | Truro, South West | — ISI · Good |
| 141 | Broughton Manor Preparatory School | 272 pupils | Independent · Day | Milton Keynes, South East | — ISI · Good |
| 142 | Alleyn's Oakfield | 271 pupils | Independent · Day | Unknown, London | — ISI · Good |
| 143 | Duncombe School | 271 pupils | Independent · Day | Hertford, East of England | — ISI · Good |
| 144 | The Ryleys School | 271 pupils | Independent · Day | Alderley Edge, North West | — ISI · Good |
| 145 | Bancroft's Preparatory School | 270 pupils | Independent · Day | Woodford Green, London | — ISI · Good |
| 146 | Newcastle Preparatory School | 267 pupils | Independent · Day | Newcastle-upon-Tyne, North East | — ISI · Good |
| 147 | Radlett Preparatory School Ltd | 266 pupils | Independent · Day | Herts, East of England | — ISI · Good |
| 148 | The Roche School | 264 pupils | Independent · Day | London, London | — ISI · Good |
| 149 | Waverley Preparatory School & Day Nursery | 264 pupils | Independent · Day | Berkshire, South East | — ISI · Good |
| 150 | Gateway School | 261 pupils | Independent · Day | Great Missenden, South East | — ISI · Good |