This is a list of ISORA winners:
the list will be updated as more information is obtained
| Year | 1st | 2nd | 3rd | Competitors | No. Races |
| 2024 | Ruth - Shanahan Family | Mojito - Peter Dunlop & Victoria Cox | Coquin - Alan Hannon | 44 | 16 |
| 2023 | Rockabill VI - Paul O'Higgins | Mojito - Peter Dunlop & Victoria Cox | Jackknife - Andrew Hall | 42 | 19 |
| 2022 | Mojito - Peter Dunlop & Victoria Cox | Jackknife - Andrew Hall | Samatom - Robert Rendal | 42 | 15 |
| 2019 | Rockabill VI - Paul O'Higgins | Aurelia - Chris & Patanne Power Smith | Jackknife - Andrew Hall | 63 | 16 (14) |
| 2018 | Mojito - Peter Dunlop & Victoria Cox | Aurelia - Chris & Patanne Power Smith | Jackknife - Andrew Hall | 60 | 15 |
| 2017 | Mojito - Peter Dunlop & Victoria Cox | Sgrech - Stephen Tudor | Jedi - Kenneth Rumball | 68 | 14 |
| 2016 | Sgrech - Stephen Tudor | Mojito - Peter Dunlop | Aurelia - Chris & Patanne Power Smith | 54 | 12 |
| 2015 | Ruth - Liam Shanahan | Jackknife - Andrew Hall | Mojito - Peter Dunlop | 47 | 14 |
| 2014 | Ruth - Liam Shanahan | Mojito - Peter Dunlop | Sgrech - Stephen Tudor | 43 | 10 |
| 2013 | Sgrech - Stephen Tudor | Ruth - Liam Shanahan | Mojito - Peter Dunlop | 38 | 11 |
| 2012 | Sgrech - Stephen Tudor | Joker 2- John Maybury | Jedi - A Scharatt & others | 39 | 10 |
| 2011 | Raging Bull - Matt Davies | Sgrech - Stephen Tudor | Tsunami - Vincent Farrell | 34 | 11 |
| 2010 | Raging Bull - Matt Davies | Just Enough - Stephen Tudor | Tsunami - Vincent Farrell | 39 | 10 |
| 2009 | Tsunami - Vincent Varrell | ||||
| 2008 | Galileo – Tennyson, Lemass & Kelliher | ||||
| 2007 | Gums 'n' Roses - John & Guy Rose | ||||
| 2006 | Gums 'n' Roses - John & Guy Rose | ||||
| 2005 | Galileo – Tennyson, Lemass & Kellihe | ||||
| 2004 | Trinculo - HYC | ||||
| 2003 | Gums 'n' Roses - John & Guy Rose | ||||
| 2002 | Jackhammer - A Hall | ||||
| 2001 | Sigmagic - R Dobson | ||||
| 2000 | Sigmagic - R Dobson | ||||
| 1999 | Keep on Smiling - J T Little | ||||
| 1998 | Keep on Smiling - J T Little | ||||
| 1997 | Corwynt Cymru III - GF Evan | ||||
| 1996 | J ackhammer - A N Hall | Keep on Smiling - T Little | Greased Lightning - B Cox | ||
| 1995 | Jackhammer - A N Hall | Megalopolis - U C Taylor | Escapade - A Fox & V Farrell | ||
| 1994 | Megalopolis - U C Taylor | Grenade - H S & C S Morris | Escapade - A Fox & V Farrell | ||
| 1993 | Megalopolis - U C Taylor | Grenade - H S & C S Morris | Emircedes - M Horgan & P Ryan | ||
| 1992 | Grenade - HS & CS Morris | ||||
| 1991 | Megalopolis - U C Taylor | Grenade - H S Morris | Samaki - J S Buckley | ||
| 1990 | Scenario Encore - A Fitton | Commanche Raider - N & P Reilly | Decibel P Watson, etal. | ||
| 1989 | Decibel - P Watson, J Reynolds, J Marrow | Scenario Act II - W V Humphreys | Shadowfax - N J Thistleton | ||
| 1988 | Checkmate - JM Biggs | ||||
| 1987 | Canterbury - AJ Vernon | ||||
| 1986 | Banga Wanga - CM Hill | ||||
| 1985 | Glider - L Keriiesz | ||||
| 1984 | Demelza - N Maguire | ||||
| 1983 | Rapparee II - B Kelly | ||||
| 1982 | Rapparee II - B Kelly | ||||
| 1981 | Rapparee II - B Kelly | ||||
| 1980 | Swuzzlebubble -WB Lyster | ||||
| 1979 | Sundancer - GR Haggas | ||||
| 1978 | Dai Mouse III - DWT Hague | ||||
| 1977 | Jublilee Race - 'Andromeda' AL Stead |
