The first win came at Listowel in September 2025, on wet, heavy ground — the kind of surface that sorts horses out quickly and exposes any weakness in stamina or heart. Limestone handled it comfortably. What makes that even more interesting is that trainer Joseph Patrick O'Brien has noted the horse ran well on a drier surface at Tipperary beforehand, suggesting it isn't just a mud-lover that only fires in the worst of conditions. A horse that handles both ends of the spectrum is far more useful and far more likely to keep finding opportunities throughout a season.
The most recent win came at Cork just this week — 24 April 2026, less than 48 hours ago — which means Limestone is in the form of its life right now. O'Brien, who operates out of Owning Hill in County Kilkenny and has sent out an extraordinary 154 winners already this season, described the horse as having the makings of a nice stayer. That word — stayer — is worth pausing on. It means a horse built for longer distances, one whose engine keeps running when others are starting to tire. If O'Brien is right, the better and tougher the race, the more Limestone may come into its own.
Four races in, two wins, never out of the top three. For a yard firing at the rate O'Brien's is this season, Limestone looks like one to keep very close tabs on.
| Course | Races | Results | Last visited | Win rate |
|---|---|---|---|---|
| Listowel Sharp |
1 | 1 win | 23 Sep | 100% |
| Cork Galloping |
1 | 1 win | 24 Apr | 100% |
| Tipperary Galloping |
1 | 1 second | 31 Aug | 0% |
| Killarney Sharp |
1 | 1 third | 14 Jul | 0% |