| O A Anaya | Pau
04-Dec-25,
As Bestas |
| O Anaya | Tarbes
17-Apr-26,
Dorianello |
| O Bizoux | Enghien
12-Oct-23,
Idee Meloc |
| O Briand | ParisLongchamp
14-Jul-25,
Juldiko |
| O De | Tarbes
17-Apr-26,
Europe |
| O Greenall & J Guerriero | Bangor-on-Dee
18-Apr-26,
My Noble Lord |
| O Groualle | Nantes
24-Nov-25,
Douce Amie |
| 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
03-May-24,
Karma De Ville |
| O McKiernan | Bellewstown
18-Apr-26,
Its Not Over Yet |
| O Murphy | Bangor-on-Dee
18-Apr-26,
Carismatic Soldier |
| 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 | Evreux
15-Apr-26,
Recording Queen |
| 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 | Hereford
17-Apr-26,
Block Rockin Beats |
| O Trigodet | Tarbes
17-Apr-26,
Plutarque |
| O. A. Martinez, Jr. | Turf Paradise
16-Apr-26,
Big Jimmy |
| O. J. Jauregui | Santa Anita
20-Apr-26,
Lady Gambita |
| 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
18-Apr-26,
Khartoum Ar |
| Ogura Kensuke | |
| Okbah Aashour | Doncaster
13-Sep-25,
Marakeb |
| Oli Rix | Wolverhampton
11-Apr-26,
Mr Macartney |
| Oliver Cole | Newbury
18-Apr-26,
Twisting Physics |
| Oliverio L L | Club Hipico Santiago
22-Apr-25,
Roce Secreto |
| Oliverio Martinez | Club Hipico Santiago
17-May-25,
Capitana Marvel |
| Olivia Cairns | Eagle Farm
18-Apr-26,
Bonfire Spark |
| Olivia M Duffy | Trentham
06-Dec-25,
Ghazzah |
| Olivia Osborne | Dubbo
18-Apr-26,
Pretty Penguin |
| Olivia Raeburn | Rockhampton
29-Dec-18,
Craiglea Magnum |
| Ollie L. Figgins Iii | Laurel Park
18-Apr-26,
Gogo'S Mojo |
| Ollie Matthews | Horseshoe Indianapolis
19-Jul-24,
Encores Dynasty |
| Ollie Pears | Ripon
16-Apr-26,
Norcross Brow |
| Ollie Sangster | Newbury
18-Apr-26,
Rossa Raheen |
| Olly Williams | Southwell
12-Apr-26,
Mickey Mongoose |
| Omani Williams | Finger Lakes
15-Jul-25,
Bon Fire Diva |
| Omar A Cardoso | Palermo
19-May-23,
Suno Top |
| Omar Acosta | Sunland Park
24-Jan-26,
Run Bubba Run |
| 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 |