Shamrock Trophy – Overall Winner
presented by Dave Heanley [ the original owner of J1]
| Year | Skipper | Boat Name |
| 1998 | Ian Scott | Jim Dandy |
| 2000 | Laurie Wales | Thingy |
| 2001 | Mike Hefford | Jay Walker |
| 2002 | Endeavour | Peter Vincent |
| 2003 | Leon Blewett | Two-Nine |
| 2004 | Nigel Bates | Jim Dandy |
| 2005 | Ian Scott | Working Class Hero |
| 2006 | Leon Blewett | Aye Dunno |
| 2007 | Graham Mander | Indulgence |
| 2008 | Leon Blewett | Aye Dunno |
| 2009 | Leon Blewett | Aye Dunno |
| 2010 | Graham Mander | Indulgence |
| 2011 | Leon Blewett | White Plague |
| 2012 | Keith May | Waiting for God |
| 2013 | Lloyd Harman | Rainbow |
| 2014 | Graham Mander | Indulgence |
| 2015 | Chris Koskela | Nemesis |
| 2016 | Leon Blewett | Wee Willy |
| 2017 | Graeme Parratt | J277 |
| 2018 | Ron Bedyn | J222 |
| 2019 | Ron Bedyn | J222 |
| 2020 | Graham Parratt | J277 |
| 2021 | Not Awarded |