| Runs |
Wkts |
| 455 | 13 | Surrey v Glamorgan | The Kia Oval, Kennington | 2015 |
| 447 | 8 | Middlesex v Glamorgan | Merchant Taylors' School Ground, Northwood | 2023 |
| 446 | 10 | Surrey v Glamorgan | The Kia Oval, Kennington | 2025 |
| 443 | 9 | Essex v Glamorgan | The Cloudfm County Ground, Chelmsford | 2017 |
| 439 | 12 | Essex v Glamorgan | The Cloud County Ground, Chelmsford | 2022 |
| 425 | 11 | Somerset v Glamorgan | County Ground, Taunton | 2006 |
| 425 | 10 | Sussex v Glamorgan | County Ground, Hove | 2010 |
| 425 | 14 | Sussex v Glamorgan | The 1st Central County Ground, Hove | 2024 |
| 409 | 14 | Worcestershire v Glamorgan | County Ground, New Road, Worcester | 2005 |
| 407 | 10 | Glamorgan v Surrey | Sophia Gardens, Cardiff | 2023 |
| 406 | 13 | Sussex v Glamorgan | The 1st Central County Ground, Hove | 2023 |
| 404 | 13 | Glamorgan v Hampshire | Sophia Gardens, Cardiff | 2019 |
| 401 | 18 | Glamorgan v Essex | Sophia Gardens, Cardiff | 2023 |
| 400 | 15 | Glamorgan v Gloucestershire | Sophia Gardens, Cardiff | 2018 |
| 400 | 16 | Essex v Glamorgan | Ambassador Cruise Line Ground, Chelmsford | 2025 |
| 398 | 10 | Gloucestershire v Glamorgan | County Ground, Bristol | 2021 |
| 395 | 13 | Surrey v Glamorgan | The Kia Oval, Kennington | 2023 |
| 391 | 17 | Somerset v Glamorgan | The Cooper Associates County Ground, Taunton | 2018 |
| 390 | 10 | Glamorgan v Somerset | Sophia Gardens, Cardiff | 2003 |
| 390 | 12 | Northamptonshire v Glamorgan | County Ground, Northampton | 2008 |
| 390 | 13 | Glamorgan v Essex | Sophia Gardens, Cardiff | 2018 |
| 389 | 14 | Gloucestershire v Glamorgan | County Ground, Bristol | 2003 |
| 389 | 10 | Surrey v Glamorgan | The Kia Oval, Kennington | 2018 |
| 387 | 10 | Somerset v Glamorgan | County Ground, Taunton | 2004 |
| 386 | 7 | Worcestershire v Glamorgan | Blackfinch New Road, Worcester | 2020 |
| 384 | 12 | Essex v Glamorgan | The Essex County Ground, Chelmsford | 2014 |
| 383 | 9 | Essex v Glamorgan | The Ford County Ground, Chelmsford | 2010 |
| 381 | 10 | Glamorgan v Gloucestershire | Sophia Gardens, Cardiff | 2006 |
| 381 | 15 | Glamorgan v Surrey | Sophia Gardens, Cardiff | 2024 |
| 380 | 8 | Surrey v Glamorgan | The Kia Oval, Kennington | 2014 |
| 380 | 9 | Glamorgan v Kent | Sophia Gardens, Cardiff | 2023 |
