| O A Anaya | Pau
04-Dec-25,
As Bestas |
| O Anaya | Mont De Marsan
29-Jul-26,
Jojo Junior |
| O Bizoux | Enghien
12-Oct-23,
Idee Meloc |
| O Briand | Cholet
30-Jun-26,
Zenya |
| O Cole | |
| O De | Dax
02-May-26,
Lordrecord |
| O Greenall & J Guerriero | Leicester
30-Jul-26,
Penny Arcade |
| O Groualle | Deauville
04-Jul-26,
Sir Sparkalot |
| O Hirata | Chukyo
17-Mar-24,
Queen's Pleiades |
| O J Power | Dundalk
18-Jan-25,
Jet Times |
| O Jauregui | Santa Anita
13-Jun-26,
Mansa Musa |
| O Martinez | Turf Paradise
03-May-24,
Karma De Ville |
| O McKiernan | Roscommon
05-Aug-26,
Its Not Over Yet |
| O Murphy | Uttoxeter
26-Jul-26,
Sure Touch |
| O Nicholls | |
| O Picard | Le Mans
18-Dec-23,
Iakim |
| O Refai | Meydan
15-Mar-25,
Trip To Rome |
| O Regley | Le Lion D'angers
24-Jul-26,
Met La Gomme |
| O Sauvaget | Meslay Du Maine
19-Mar-21,
Gitane Des Pictons |
| O Schnakenberg | Le Croise-Laroche
21-Mar-26,
Olaf |
| O Sherwood | Uttoxeter
19-Jul-23,
Jersey Wonder |
| O Signy | Fontwell
07-May-26,
Moscow Star |
| O Trigodet | Dax
31-Jul-26,
Salihah |
| O. A. Martinez, Jr. | Turf Paradise
03-May-26,
Supersonic Blue |
| O. J. Jauregui | Del Mar
02-Aug-26,
Perfectionachieved |
| 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 |
| Octavio Torres-prieto | Sunray Park
09-May-26,
Silver Spurs Ar |
| Ogura Kensuke | |
| Okbah Aashour | Doncaster
13-Sep-25,
Marakeb |
| Olga J. Nowak | |
| Oli Rix | Thirsk
01-Aug-26,
Dosman |
| Oliver Cole | Goodwood
01-Aug-26,
Great Chieftain |
| Oliverio L L | Club Hipico Santiago
22-Apr-25,
Roce Secreto |
| Oliverio Martinez | Club Hipico Santiago
17-May-25,
Capitana Marvel |
| Olivia Cairns | Warwick
04-Aug-26,
Billilicious |
| Olivia Hegarty | Kilbeggan
25-Jul-26,
I'm Gold |
| Olivia M Duffy | Hawera
11-Jul-26,
Mr Marigold |
| Olivia Osborne | Gundagai
04-Aug-26,
Brilliant Beagle |
| Olivia Raeburn | Rockhampton
29-Dec-18,
Craiglea Magnum |
| Ollie L. Figgins Iii | Charles Town
01-Aug-26,
Alice's Moon |
| Ollie Matthews | Horseshoe Indianapolis
19-Jul-24,
Encores Dynasty |
| Ollie Pears | Newmarket
01-Aug-26,
Lady Dublin |
| Ollie Sangster | Ffos Las
04-Aug-26,
Piazza |
| Olly Williams | Catterick
04-Aug-26,
Muhib |
| Omani Williams | Finger Lakes
15-Jul-25,
Bon Fire Diva |
| Omar A Cardoso | Palermo
19-May-23,
Suno Top |
| Omar Acosta | Sunland Park
18-Jan-26,
Itz Goin Down |
| 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 |