| Name | Last Run |
|---|---|
| Optional Mix | Limerick, 29-Jan-25 |
| Options | Flemington, 01-Nov-25 |
| Options Open | Timaru, 09-Oct-25 |
| Optiva Star | Newmarket, 01-Nov-24 |
| Optume | Seymour, 03-Jan-24 |
| OPULASS | Ipswich, 18-Nov-11 |
| Opulence | Fairview, 14-Jul-23 |
| Opulence Start | Kembla Grange, 20-Sep-14 |
| Opulent Angel | Sportsbet-Ballarat, 24-Mar-19 |
| Opulent Jewel | Tokyo, 04-Oct-25 |
| Opulent Lass | |
| Opulent Restraint | Keeneland, 12-Oct-25 |
| Opulent Ways | Thistledown, 15-Aug-25 |
| Opunake | Singapore, 23-Mar-24 |
| Opunake | Kranji, 08-Apr-23 |
| Opus | Saint-Cloud, 04-Jul-25 |
| Opus | Bairnsdale, 21-Jul-25 |
| Opus | Gulfstream, 13-Nov-23 |
| Opus Belle | Caloundra, 07-Nov-10 |
| Opus Dai | Gawler, 10-Apr-22 |
| Opus Dei | Pune, 03-Nov-24 |
| Opus Forty Two | Laurel Park, 13-Apr-25 |
| Opus One | Deauville, 10-Aug-24 |
| Opus Purple | Seoul, 28-Jul-24 |
| Opus Uno | Del Mar, 03-Nov-25 |
| Opynunated | Will Rogers Downs, 05-Nov-25 |
| Oquassa | Sportsbet-Ballarat Synthetic, 06-Jun-22 |
| Or Am I | Cranbourne, 31-Oct-25 |
| Or Armure | Ohi, 02-Dec-24 |
| Or Bleu Du Grenat | Nantes, 09-Apr-25 |
| Or Du Souverain | Hakodate, 20-Jul-25 |
| Or Else | Cloncurry, 19-Mar-22 |
| Or Fest | Sapporo, 27-Jul-25 |
| Or Fin | Fontainebleau, 02-Apr-24 |
| Or Gris | Clairefontaine, 20-Oct-23 |
| Or Kimacoy | Sunray Park, 11-May-24 |
| Or Magique | Keeneland, 25-Oct-25 |
| Or Majes | Kasamatsu, 12-Jun-25 |
| Or Mare | Mombetsu, 03-Nov-25 |
| Or Mirabelle | Nagoya, 30-Oct-25 |
| Or Mirage | Saga, 15-Jun-24 |
| Or My God | Albany, 21-Nov-10 |
| Or Never | Palermo, 30-May-23 |
| Or Noir | Hakodate, 19-Jul-25 |
| Or What | Muswellbrook, 21-May-18 |
| Ora Banda Boy | Bunbury, 09-Dec-11 |
| Ora Certa | Colonial Downs, 28-Aug-25 |
| Ora Miss | Ascot, 27-Feb-13 |
| Ora Solare | Kasamatsu, 09-Nov-23 |
| Ora Veritas | Nagoya, 08-Jul-25 |
| Orabelle | Sunshine Coast, 30-Nov-14 |
| Orabreeze | Ascot, 30-Jan-19 |
| Oracle | Deauville, 07-Nov-25 |
| Oracle | Werribee, 15-Mar-12 |
| Oracle | Kyoto, 15-Jun-24 |
| Oracle Lake | Bunbury, 08-Dec-13 |
| Oracle Miss | Sapphire Coast, 04-Dec-17 |
| Oracle Of Omaha | Canberra, 13-Dec-24 |
| Oracle Of Paradise | Santa Anita, 05-Oct-25 |
| Oracle Son | Belmont, 23-Aug-25 |