| Inns | HS |
| 213 | 37 | Downside Wanderers v Marlborough Blues | Marlborough College Ground, Marlborough | 2025 |
| 200-8 | 37 | Downside Wanderers v Old Malvernians | Malvern College Ground, Malvern | 1984 |
| 196-7 | 49 | Downside Wanderers v Old Brightonians | Brighton College Ground, Brighton | 1977 |
| 189 | 46 | Downside Wanderers v Bradfield Waifs | Downside School, Stratton-on-the-Fosse | 1997 |
| 179-9 | 42 | Downside Wanderers v Bradfield Waifs | Downside School, Stratton-on-the-Fosse | 1994 |
| 170-9 | 44 | Downside Wanderers v Old Cholmeleians | Highgate School Ground, Highgate | 1980 |
| 167 | 46 | Downside Wanderers v Old Alleynians | Dulwich College Ground, Dulwich | 1985 |
| 157 | 37* | Downside Wanderers v Repton Pilgrims | Repton School Ground, Repton | 2019 |
| 155 | 42 | Downside Wanderers v Harrow Wanderers | Harrow School Cricket Ground, Harrow-on-the-Hill | 1990 |
| 155 | 40 | Downside Wanderers v Sherborne Pilgrims | Downside School, Stratton-on-the-Fosse | 2013 |
| 139 | 25 | Downside Wanderers v Old Brightonians | Brighton College Ground, Brighton | 1979 |
| 130 | 32 | Downside Wanderers v Old Cliftonians | Clifton College Close Ground, Clifton | 1972 |
| 126 | 38 | Downside Wanderers v Old Wykehamists | Ridding Field, Winchester | 1969 |
| 126 | 27 | Downside Wanderers v Stowe Templars | Stowe School Ground, Stowe | 2005 |
| 126 | 26 | Downside Wanderers v Harrow Wanderers | Downside School, Stratton-on-the-Fosse | 2024 |
| 125 | 45 | Downside Wanderers v Repton Pilgrims | Downside School, Stratton-on-the-Fosse | 2006 |
| 122 | 28 | Downside Wanderers v St Edward's Martyrs | St Edward's School Ground, Oxford | 2018 |
| 115-4 | 37 | Downside Wanderers v Old Whitgiftians | Downside School, Stratton-on-the-Fosse | 1982 |
| 110 | 29 | Downside Wanderers v Old Malvernians | Downside School, Stratton-on-the-Fosse | 2007 |
| 104 | 24 | Downside Wanderers v Haileybury Hermits | Haileybury College Ground, Hertford | 1991 |
| 102 | 24 | Downside Wanderers v Old Amplefordians | Downside School, Stratton-on-the-Fosse | 1977 |
| 102 | 30 | Downside Wanderers v Old Amplefordians | Downside School, Stratton-on-the-Fosse | 2003 |
| 101 | 25 | Downside Wanderers v Charterhouse Friars | Downside School, Stratton-on-the-Fosse | 2013 |
| 99 | 28 | Downside Wanderers v Old Malvernians | Downside School, Stratton-on-the-Fosse | 1995 |
| 98 | 20 | Downside Wanderers v Oundle Rovers | Downside School, Stratton-on-the-Fosse | 2014 |
| 97 | 18 | Downside Wanderers v Bradfield Waifs | Bradfield College, Reading | 1998 |
| 90 | 24 | Downside Wanderers v Bradfield Waifs | Bradfield College, Reading | 1973 |
| 90 | 23 | Downside Wanderers v Sherborne Pilgrims | Sherborne School, Sherborne | 2002 |
| 89 | 15 | Downside Wanderers v Old Cheltonians | Downside School, Stratton-on-the-Fosse | 2021 |
| 85-9 | 19 | Downside Wanderers v Old Bedfordians | Whitehorn Lane, Letchworth | 2017 |
