| Inns | HS |
| 281-9 | 92 | Old Wellingtonians v Charterhouse Friars | Wellington College, Crowthorne | 2017 |
| 277 | 76 | Old Wellingtonians v Stowe Templars | Wellington College, Crowthorne | 2016 |
| 273-5 | 86 | Old Wellingtonians v Haileybury Hermits | Haileybury College Ground, Hertford | 1972 |
| 271-4 | 97 | Old Wellingtonians v Uppingham Rovers | Wellington College, Crowthorne | 2001 |
| 269-4 | 91* | Old Wellingtonians v Haileybury Hermits | Haileybury College Ground, Hertford | 2022 |
| 268-5 | 71 | Old Wellingtonians v Repton Pilgrims | Wellington College, Crowthorne | 2023 |
| 263-9 | 54 | Old Wellingtonians v Uppingham Rovers | Wellington College, Crowthorne | 1976 |
| 263-6 | 53 | Old Wellingtonians v Old Cheltonians | College Ground, Cheltenham | 1980 |
| 263-5 | 72 | Old Wellingtonians v Old Cliftonians | Wellington College, Crowthorne | 1995 |
| 255-6 | 85 | Old Wellingtonians v Eton Ramblers | Upper Club, Eton College | 2002 |
| 250-7 | 96 | Old Wellingtonians v Eton Ramblers | Upper Club, Eton College | 2003 |
| 247-7 | 70 | Old Wellingtonians v Old Brightonians | Wellington College, Crowthorne | 2000 |
| 246-8 | 46 | Old Wellingtonians v Eton Ramblers | Upper Club, Eton College | 2009 |
| 245-9 | 93 | Old Wellingtonians v Old Hamptonians | Hampton School, Hampton | 2024 |
| 243-6 | 64* | Old Wellingtonians v Charterhouse Friars | Charterhouse School, Godalming | 1968 |
| 243-7 | 92* | Old Wellingtonians v Harrow Wanderers | Wellington College, Crowthorne | 1976 |
| 243 | 69 | Old Wellingtonians v Bradfield Waifs | Bradfield College, Reading | 1999 |
| 243-5 | 82 | Old Wellingtonians v Old Cliftonians | Clifton College Close Ground, Clifton | 2007 |
| 243-9 | 59 | Old Wellingtonians v Old Bedfordians | Wellington College, Crowthorne | 2018 |
| 240-7 | 72 | Old Wellingtonians v Old Cholmeleians | Highgate School Ground, Highgate | 1978 |
| 238-5 | 79 | Old Wellingtonians v Old Malvernians | Bank of England Ground, Roehampton | 1995 |
| 237 | 71 | Old Wellingtonians v Stowe Templars | Wellington College, Crowthorne | 1973 |
| 234-9 | 83 | Old Wellingtonians v Rugby Meteors | Rugby School Ground, Rugby | 2018 |
| 229 | 79 | Old Wellingtonians v Old Eastbournians | Eastbourne College Ground, Eastbourne | 2023 |
| 226-8 | 85 | Old Wellingtonians v Harrow Wanderers | Harrow School Cricket Ground, Harrow-on-the-Hill | 1968 |
| 221 | 47 | Old Wellingtonians v Old Brightonians | Wellington College, Crowthorne | 1998 |
| 220-7 | 69 | Old Wellingtonians v Old Cheltonians | Wellington College, Crowthorne | 1989 |
| 219 | 46 | Old Wellingtonians v Bradfield Waifs | Bradfield College, Reading | 2017 |
| 215-8 | 53* | Old Wellingtonians v Bradfield Waifs | Wellington College, Crowthorne | 1986 |
| 215-9 | 73 | Old Wellingtonians v Charterhouse Friars | Wellington College, Crowthorne | 2016 |
| 214 | 44 | Old Wellingtonians v Old Cliftonians | Clifton College Close Ground, Clifton | 1975 |
| 213 | 72 | Old Wellingtonians v Uppingham Rovers | Middle Field Pitch 1, Uppingham School | 1987 |
| 213 | 50 | Old Wellingtonians v Uppingham Rovers | Wellington College, Crowthorne | 1996 |
| 210-5 | 89* | Old Wellingtonians v Old Amplefordians | Ampleforth College, Ampleforth | 1978 |
| 210-7 | 63 | Old Wellingtonians v Old Hurst Johnians | Wellington College, Crowthorne | 2022 |
| 207-6 | 58 | Old Wellingtonians v Old Tonbridgians | Tonbridge School Ground, Tonbridge | 1985 |
| 205-8 | 58 | Old Wellingtonians v Oundle Rovers | Wellington College, Crowthorne | 1969 |
| 203-9 | 44 | Old Wellingtonians v Old Cheltonians | Wellington College, Crowthorne | 2008 |
| 202-8 | 63 | Old Wellingtonians v Charterhouse Friars | Charterhouse School, Godalming | 1986 |
| 202 | 80 | Old Wellingtonians v Eton Ramblers | Upper Club, Eton College | 2015 |
| 200-8 | 74 | Old Wellingtonians v Eton Ramblers | Wellington College, Crowthorne | 2000 |
