| Inns | HS |
| 254-3 | 73 | Middlesex v Surrey | The Kia Oval, Kennington | 2023 |
| 229-9 | 87 | Middlesex v Gloucestershire | Brunton Memorial Ground, Radlett | 2022 |
| 229-5 | 87* | Middlesex v Somerset | The Cooper Associates County Ground, Taunton | 2025 |
| 227-4 | 83* | Middlesex v Somerset | The Cooper Associates County Ground, Taunton | 2019 |
| 226-8 | 61 | Middlesex v Essex | The Cloud County Ground, Chelmsford | 2023 |
| 217-7 | 77 | Middlesex v Hampshire | Brunton Memorial Ground, Radlett | 2021 |
| 215-4 | 88* | Middlesex v Somerset | Old Deer Park, Richmond | 2019 |
| 213-4 | 79* | Middlesex v Glamorgan | Old Deer Park, Richmond | 2010 |
| 210-6 | 72 | Middlesex v Hampshire | The Rose Bowl, Southampton | 2005 |
| 210-6 | 87* | Middlesex v Kent | Spitfire Ground, St Lawrence, Canterbury | 2016 |
| 210-3 | 78 | Middlesex v Essex | Lord's Cricket Ground, St John's Wood | 2018 |
| 210-8 | 70 | Middlesex v Surrey | Lord's Cricket Ground, St John's Wood | 2019 |
| 209-4 | 84 | Middlesex v Kent | Lord's Cricket Ground, St John's Wood | 2020 |
| 209-5 | 77 | Middlesex v Glamorgan | Merchant Taylors' School Ground, Northwood | 2023 |
| 207-2 | 90* | Middlesex v Kent | St Lawrence Ground, Canterbury | 2012 |
| 205-5 | 90 | Middlesex v Kent | Lord's Cricket Ground, St John's Wood | 2015 |
| 203-6 | 63 | Middlesex v Essex | Lord's Cricket Ground, St John's Wood | 2017 |
| 203-7 | 85* | Middlesex v Essex | The Cloud County Ground, Chelmsford | 2024 |
| 200-6 | 43 | Middlesex v Essex | Lord's Cricket Ground, St John's Wood | 2010 |
| 200-5 | 55 | Middlesex v Surrey | Lord's Cricket Ground, St John's Wood | 2016 |
| 200-9 | 71* | Middlesex v Glamorgan | Sophia Gardens, Cardiff | 2023 |
| 195-9 | 60* | Middlesex v Somerset | County Ground, Taunton | 2011 |
| 195-6 | 93 | Middlesex v Hampshire | Uxbridge Cricket Club Ground, Uxbridge | 2016 |
| 195-7 | 75 | Middlesex v Gloucestershire | Seat Unique Stadium, Bristol | 2025 |
| 190-7 | 48 | Middlesex v Hampshire | The Rose Bowl, Southampton | 2008 |
| 189-8 | 85 | Middlesex v Kent | The Kent County Cricket Ground, Beckenham | 2005 |
| 189-7 | 36 | Middlesex v Kent | The Kent County Cricket Ground, Beckenham | 2018 |
| 189-5 | 54 | Middlesex v Gloucestershire | Merchant Taylors' School Ground, Northwood | 2025 |
| 188-5 | 77 | Middlesex v Surrey | Lord's Cricket Ground, St John's Wood | 2020 |
| 188-8 | 47 | Middlesex v Surrey | Lord's Cricket Ground, St John's Wood | 2022 |
| 187-6 | 75 | Middlesex v Kent | The Rose Bowl, Southampton | 2008 |
| 187-8 | 94 | Middlesex v Hampshire | Merchant Taylors' School Ground, Northwood | 2025 |
| 186-7 | 39 | Middlesex v Somerset | Uxbridge Cricket Club Ground, Uxbridge | 2017 |
| 186-7 | 51 | Middlesex v Sussex | Lord's Cricket Ground, St John's Wood | 2025 |
| 185-6 | 79 | Middlesex v Essex | John Walker's Ground, Southgate | 2005 |
| 185-8 | 86 | Middlesex v Gloucestershire | Uxbridge Cricket Club Ground, Uxbridge | 2010 |
| 185-5 | 53 | Middlesex v Surrey | Lord's Cricket Ground, St John's Wood | 2015 |
| 184-3 | 68* | Middlesex v Glamorgan | Old Deer Park, Richmond | 2014 |
| 184 | 62 | Middlesex v Sussex | The 1st Central County Ground, Hove | 2018 |
| 184-6 | 50 | Middlesex v Kent | Spitfire Ground, St Lawrence, Canterbury | 2020 |
| 182-7 | 67 | Middlesex v Hampshire | The Ageas Bowl, Southampton | 2013 |
| 182-9 | 68* | Middlesex v Gloucestershire | College Ground, Cheltenham | 2017 |
| 181-6 | 76 | Middlesex v Hampshire | The Ageas Bowl, Southampton | 2016 |
| 181-8 | 53 | Middlesex v Gloucestershire | College Ground, Cheltenham | 2024 |
| 181-6 | 53 | Middlesex v Surrey | Lord's Cricket Ground, St John's Wood | 2025 |
| 180-5 | 86* | Middlesex v Essex | Lord's Cricket Ground, St John's Wood | 2014 |
| 179-8 | 88 | Middlesex v Kent | Old Deer Park, Richmond | 2017 |
| 179-6 | 46 | Middlesex v Essex | The Cloudfm County Ground, Chelmsford | 2018 |
| 179-5 | 67 | Middlesex v Gloucestershire | Brunton Memorial Ground, Radlett | 2021 |
| 179-6 | 54 | Middlesex v Gloucestershire | Merchant Taylors' School Ground, Northwood | 2023 |
| 178-7 | 66 | Middlesex v Surrey | Lord's Cricket Ground, St John's Wood | 2006 |
| 178-8 | 61 | Middlesex v Sussex | Lord's Cricket Ground, St John's Wood | 2013 |
| 178-9 | 54 | Middlesex v Hampshire | Lord's Cricket Ground, St John's Wood | 2015 |
| 178-6 | 44 | Middlesex v Kent | Spitfire Ground, St Lawrence, Canterbury | 2024 |
| 177 | 78 | Middlesex v Surrey | Lord's Cricket Ground, St John's Wood | 2005 |
| 177-6 | 41 | Middlesex v Essex | The Ford County Ground, Chelmsford | 2006 |
| 177-7 | 58 | Middlesex v Sussex | Lord's Cricket Ground, St John's Wood | 2008 |
| 177-5 | 94* | Middlesex v Sussex | Lord's Cricket Ground, St John's Wood | 2023 |
| 176-7 | 37 | Middlesex v Kent | Lord's Cricket Ground, St John's Wood | 2019 |
| 175-3 | 78 | Middlesex v Gloucestershire | County Ground, Bristol | 2015 |
| 175-5 | 84 | Middlesex v Somerset | Lord's Cricket Ground, St John's Wood | 2018 |
| 174-7 | 54 | Middlesex v Hampshire | Old Deer Park, Richmond | 2005 |
| 174-3 | 86 | Middlesex v Essex | Lord's Cricket Ground, St John's Wood | 2013 |
| 174-6 | 55 | Middlesex v Somerset | The Cooper Associates County Ground, Taunton | 2018 |
| 174-7 | 64 | Middlesex v Surrey | The Kia Oval, Kennington | 2021 |
| 173-7 | 35 | Middlesex v Essex | County Ground, Chelmsford | 2003 |
| 173-7 | 43* | Middlesex v Essex | The Ford County Ground, Chelmsford | 2010 |
| 173-8 | 49 | Middlesex v Surrey | Lord's Cricket Ground, St John's Wood | 2011 |
| 173-6 | 64 | Middlesex v Hampshire | The Ageas Bowl, Southampton | 2014 |
| 173-8 | 59* | Middlesex v Essex | The Essex County Ground, Chelmsford | 2016 |
| 173 | 48 | Middlesex v Kent | Spitfire Ground, St Lawrence, Canterbury | 2023 |
| 173 | 57 | Middlesex v Glamorgan | Lord's Cricket Ground, St John's Wood | 2024 |
| 172-6 | 51 | Middlesex v Gloucestershire | Brightside Ground, Bristol | 2018 |
| 172-6 | 47 | Middlesex v Glamorgan | Brunton Memorial Ground, Radlett | 2022 |
| 171-7 | 62 | Middlesex v Kent | Uxbridge Cricket Club Ground, Uxbridge | 2008 |
| 171 | 74 | Middlesex v Gloucestershire | Old Deer Park, Richmond | 2015 |
| 171-7 | 84* | Middlesex v Somerset | Uxbridge Cricket Club Ground, Uxbridge | 2015 |
| 171-5 | 48 | Middlesex v Sussex | Uxbridge Cricket Club Ground, Uxbridge | 2019 |
| 171-3 | 91* | Middlesex v Glamorgan | Brunton Memorial Ground, Radlett | 2021 |
| 171-7 | 58 | Middlesex v Glamorgan | Sophia Gardens, Cardiff | 2022 |
| 171 | 80 | Middlesex v Hampshire | The Ageas Bowl, Southampton | 2023 |
| 169-9 | 58 | Middlesex v Surrey | Lord's Cricket Ground, St John's Wood | 2021 |
| 169-5 | 60 | Middlesex v Essex | The Cloudfm County Ground, Chelmsford | 2021 |
| 169-7 | 73* | Middlesex v Gloucestershire | The Cloud County Ground, Chelmsford | 2024 |
| 167-7 | 51 | Middlesex v Essex | Lord's Cricket Ground, St John's Wood | 2020 |
| 166-9 | 49 | Middlesex v Hampshire | The Rose Bowl, Southampton | 2006 |
| 166-5 | 73 | Middlesex v Essex | Lord's Cricket Ground, St John's Wood | 2009 |
| 166-2 | 48 | Middlesex v Glamorgan | The SWALEC Stadium, Cardiff | 2010 |
| 166-3 | 88* | Middlesex v Essex | Lord's Cricket Ground, St John's Wood | 2019 |
| 166-7 | 59 | Middlesex v Sussex | Lord's Cricket Ground, St John's Wood | 2021 |
| 165-3 | 60 | Middlesex v Kent | Old Deer Park, Richmond | 2003 |
| 165-7 | 54 | Middlesex v Kent | Lord's Cricket Ground, St John's Wood | 2006 |
| 165-5 | 70 | Middlesex v Glamorgan | The SSE SWALEC Stadium, Cardiff | 2015 |
| 165-8 | 60 | Middlesex v Hampshire | Lord's Cricket Ground, St John's Wood | 2018 |
| 165-5 | 79 | Middlesex v Sussex | Lord's Cricket Ground, St John's Wood | 2020 |
| 164-7 | 80 | Middlesex v Hampshire | Uxbridge Cricket Club Ground, Uxbridge | 2010 |
| 164-5 | 46 | Middlesex v Sussex | The PROBIZ County Ground, Hove | 2011 |
| 163-6 | 61 | Middlesex v Surrey | The Brit Oval, Kennington | 2007 |
| 163-7 | 37 | Middlesex v Essex | The Cloudfm County Ground, Chelmsford | 2017 |
| 163-9 | 38 | Middlesex v Hampshire | The Ageas Bowl, Southampton | 2018 |
| 163-6 | 47 | Middlesex v Hampshire | The Ageas Bowl, Southampton | 2022 |
| 163 | 68 | Middlesex v Sussex | The 1st Central County Ground, Hove | 2022 |
| 163-4 | 65* | Middlesex v Gloucestershire | Seat Unique Stadium, Bristol | 2022 |
| 162-3 | 61* | Middlesex v Surrey | The Brit Oval, Kennington | 2009 |
| 162-5 | 77 | Middlesex v Hampshire | Old Deer Park, Richmond | 2013 |
| 162-6 | 59 | Middlesex v Somerset | The Cooper Associates County Ground, Taunton | 2017 |
| 162-8 | 51 | Middlesex v Kent | Spitfire Ground, St Lawrence, Canterbury | 2021 |
| 161-4 | 71 | Middlesex v Hampshire | The Ageas Bowl, Southampton | 2012 |
| 161-7 | 47* | Middlesex v Somerset | County Ground, Taunton | 2014 |
| 161-9 | 41 | Middlesex v Surrey | Lord's Cricket Ground, St John's Wood | 2017 |
| 161-5 | 47 | Middlesex v Gloucestershire | Uxbridge Cricket Club Ground, Uxbridge | 2017 |
| 161-7 | 66 | Middlesex v Surrey | Lord's Cricket Ground, St John's Wood | 2018 |
| 161-8 | 50* | Middlesex v Gloucestershire | College Ground, Cheltenham | 2021 |
| 161 | 53 | Middlesex v Essex | Lord's Cricket Ground, St John's Wood | 2025 |
| 160-7 | 64* | Middlesex v Hampshire | The Ageas Bowl, Southampton | 2017 |
| 160-7 | 34 | Middlesex v Gloucestershire | Uxbridge Cricket Club Ground, Uxbridge | 2018 |
| 160-8 | 53 | Middlesex v Nottinghamshire | Trent Bridge, Nottingham | 2019 |
| 160-6 | 44* | Middlesex v Somerset | Lord's Cricket Ground, St John's Wood | 2022 |
| 160-5 | 68 | Middlesex v Kent | Spitfire Ground, St Lawrence, Canterbury | 2025 |
| 159-9 | 60 | Middlesex v Gloucestershire | Merchant Taylors' School Ground, Northwood | 2016 |
| 159-7 | 53 | Middlesex v Hampshire | Brunton Memorial Ground, Radlett | 2023 |
| 159-9 | 52 | Middlesex v Sussex | The 1st Central County Ground, Hove | 2024 |
| 159-4 | 72 | Middlesex v Essex | Ambassador Cruise Line Ground, Chelmsford | 2025 |
| 157-9 | 41 | Middlesex v Surrey | The Kia Oval, Kennington | 2012 |
| 156-2 | 82* | Middlesex v Hampshire | Old Deer Park, Richmond | 2012 |
| 156-5 | 40* | Middlesex v Gloucestershire | Brightside Ground, Bristol | 2016 |
| 156-7 | 90 | Middlesex v Sussex | Lord's Cricket Ground, St John's Wood | 2018 |
| 156-3 | 91* | Middlesex v Gloucestershire | Brunton Memorial Ground, Radlett | 2019 |
| 155 | 52 | Middlesex v Surrey | The AMP Oval, Kennington | 2003 |
| 155-7 | 42 | Middlesex v Kent | Mote Park, Maidstone | 2004 |
| 155-5 | 57 | Middlesex v Hampshire | The Rose Bowl, Southampton | 2009 |
| 155-6 | 48* | Middlesex v Somerset | Lord's Cricket Ground, St John's Wood | 2010 |
| 155-2 | 98* | Middlesex v Somerset | The Kia Oval, Kennington | 2014 |
| 155-8 | 46 | Middlesex v Sussex | The 1st Central County Ground, Hove | 2020 |
| 155-8 | 31 | Middlesex v Surrey | The Kia Oval, Kennington | 2022 |
| 154-6 | 41 | Middlesex v Kent | Lord's Cricket Ground, St John's Wood | 2010 |
| 153-4 | 69 | Middlesex v Sussex | County Ground, Hove | 2008 |
| 153-5 | 69 | Middlesex v Essex | The Essex County Ground, Chelmsford | 2014 |
| 153-6 | 31 | Middlesex v Hampshire | The Ageas Bowl, Southampton | 2015 |
| 153-5 | 52* | Middlesex v Hampshire | The Ageas Bowl, Southampton | 2019 |
| 152-4 | 53 | Middlesex v Sussex | The Brighton and Hove Jobs County Ground, Hove | 2013 |
| 151-9 | 40 | Middlesex v Hampshire | Merchant Taylors' School Ground, Northwood | 2014 |
| 150-5 | 32 | Middlesex v Essex | Lord's Cricket Ground, St John's Wood | 2011 |
| 150-5 | 46 | Middlesex v Essex | The Essex County Ground, Chelmsford | 2015 |
