| O A Anaya | Pau
04-Dec-25,
Dschingis Dream |
| O Bizoux | Enghien
12-Oct-23,
Idee Meloc |
| O Briand | ParisLongchamp
14-Jul-25,
Juldiko |
| O De | Pau
04-Dec-25,
Gartree |
| O Greenall & J Guerriero | Uttoxeter
10-Dec-25,
Beep Beep Becky |
| O Hirata | Chukyo
17-Mar-24,
Queen's Pleiades |
| O J Power | Cork
12-Jul-25,
Tiffany Mae |
| O Jauregui | Del Mar
25-Jul-25,
Dance Ella Dance |
| O Martinez | Turf Paradise
25-Apr-25,
Big Jack |
| O McKiernan | Cork
07-Dec-25,
Minella Boss |
| O Murphy | Uttoxeter
10-Dec-25,
Hara Kiri |
| O Nicholls | Cheltenham
03-May-25,
All Loved Up |
| O Picard | Le Mans
18-Dec-23,
Iakim |
| O Refai | Meydan
15-Mar-25,
Trip To Rome |
| O Regley | Craon
30-Nov-25,
D'allure |
| O Schnakenberg | Chantilly
18-Nov-25,
Newkidontheblock |
| O Sherwood | Uttoxeter
19-Jul-23,
Jersey Wonder |
| O Signy | Ffos Las
09-Nov-25,
The Scorpion King |
| O Trigodet | Pau
04-Dec-25,
Plutarque |
| Oberdan Pereira | Gavea
23-Apr-25,
Lilli Bel |
| Obidio Hernandez | Sam Houston Race Park
23-Apr-23,
Cletajean |
| Octavio Saenz | Zia Park
04-Dec-23,
Jl Juanita |
| Ogura Kensuke | |
| Oliver Cole | Wolverhampton
09-Dec-25,
Insuspense |
| Oliverio L L | Club Hipico Santiago
22-Apr-25,
Roce Secreto |
| Oliverio Martinez | Club Hipico Santiago
17-May-25,
Capitana Marvel |
| Olivia Cairns | Sunshine Coast
07-Dec-25,
Pellinor |
| Olivia M Duffy | Waverley
14-Nov-25,
Ghazzah |
| Olivia Osborne | Albury
06-Dec-25,
Pretty Penguin |
| Olivia Raeburn | Rockhampton
29-Dec-18,
Craiglea Magnum |
| Ollie Matthews | Horseshoe Indianapolis
19-Jul-24,
Encores Dynasty |
| Ollie Pears | Wetherby
01-Nov-25,
Max Of Stars |
| Ollie Sangster | Lingfield
08-Dec-25,
Marra Donna |
| Olly Williams | Chelmsford City
05-Dec-25,
Muhib |
| Omani Williams | Saratoga
23-Aug-25,
King Of Fog |
| Omar A Cardoso | Palermo
19-May-23,
Suno Top |
| Omar Beltrame | San Isidro
05-Dec-24,
Que Dionisio |
| Omar Castro | San Isidro
01-Dec-24,
Aladdins Cave |
| Omar Cruz | Turf Paradise
30-Apr-25,
Queens Effort |
| Omar D Castro | La Plata
21-Sep-23,
Claro Nistel |
| Omar F Labanca | Palermo
10-Nov-23,
As Del Tango |
| Omar Farfan | San Isidro
26-Apr-25,
Payaso Azul |
| Omar Guadarrama | Turf Paradise
06-Mar-25,
Horns N Halos |
| Omar Ilarione | San Isidro
13-Feb-25,
Gracioso Nak |
| Omar L Villarreta | Palermo
27-Jun-23,
Vueltera Best |
| Omar Labanca | San Isidro
01-May-25,
Sixties Girl |
| Omar P Tournoud | Palermo
31-Oct-23,
Violenta Storm |
| Omar Quintilli | San Isidro
17-Oct-24,
Al Mufti |
| Omar R Farfan | San Isidro
13-Mar-25,
Melodia Seattle |
| Omar Tournoud | San Isidro
17-Apr-25,
Simplemente Vida |
| Omar Vargas | Zia Park
07-Dec-25,
Rocker S |
| Omar Villarreta | San Isidro
24-Oct-24,
Manjar Exquisito |
| Orlando Fernandes | Gavea
29-Oct-24,
Rack Sameah |
| Orlando Guerrero | Turf Paradise
04-Dec-25,
Singles Corona |
| Orlando Noda | Aqueduct
08-Dec-25,
Cha Cha Wren |
| Orlando Perez | San Isidro
15-May-25,
Isla Soledad |
| Orlando Rose | Tampa Bay Downs
07-Dec-25,
Techstar |
| Orlando Vinardi | San Isidro
07-Sep-23,
Buenos Anos |
| Orrin Cogburn | Remington Park
07-Dec-25,
Thetruthisthetruth |
| Ortega | San Isidro
31-Oct-24,
Land Hopper |