| Y A Quien No | Hipodromo Chile, 2024-09-27 |
| Y B Sober | Wolverhampton, 2023-09-26 |
| Y Con Que | Palermo, 2023-09-15 |
| Y D Dubai | Ohi, 2025-07-14 |
| Y G Champ | Kasamatsu, 2023-07-19 |
| Y S Cancer | Nagoya, 2023-08-10 |
| Y S Chocolat | Kasamatsu, 2024-07-17 |
| Y S Drama | Kasamatsu, 2023-09-13 |
| Y S Kraken | Kasamatsu, 2025-05-13 |
| Y Se Marcho | Hipodromo Chile, 2023-05-05 |
| Y T Queen | Funabashi, 2025-07-30 |
| Y U Unbridled | Fairmount Park, 2025-10-01 |
| Y Vee R | Hastings Racecourse, 2024-09-22 |
| Y Y Cute | Nagoya, 2024-01-18 |
| Y Y Legend | Tokyo, 2025-10-12 |
| Y Y Smile | Kochi, 2023-05-14 |
| Y Y Sunday | Nagoya, 2024-11-25 |
| Y Y Warrior | Sonoda, 2025-10-09 |
| Y'all | Nakayama, 2025-03-15 |
| Y'allreadyforthis | Colonial Downs, 2025-08-07 |
| Y'engeze | bet365 Park Wodonga, 2023-08-06 |
| Y's Go Go | Ohi, 2025-10-20 |
| Y'zin Up | Charles Town, 2025-04-24 |
| Ya Beauty | Turfway Park, 2023-03-16 |
| Ya Crackin' Jokes | bet365 Park Kilmore, 2017-01-07 |
| Ya Dar | Yarmouth, 2023-06-01 |
| Ya Era Hora | Club Hipico Santiago, 2025-05-10 |
| Ya Fue | Concepcion, 2025-05-21 |
| Ya Gotta Laugh | TRIAL bet365 Echuca, 2024-02-06 |
| Ya Hafhd | Ascot, 2024-07-12 |
| Ya Karim | Yarmouth, 2025-10-14 |
| Ya Know Yaseff | Southwell, 2024-02-19 |
| Ya Li | San Isidro, 2023-11-30 |
| Ya Llegue | Hipodromo Chile, 2025-01-19 |
| Ya Lo Creo | Hipodromo Chile, 2025-05-09 |
| Ya Lo Vi | Club Hipico Santiago, 2025-04-05 |
| Ya Love Her | Orange, 2025-04-11 |
| Ya Magico | Club Hipico Santiago, 2025-05-20 |
| Ya Mamita | Hipodromo Chile, 2025-04-04 |
| Ya Mar | Woodbine, 2024-04-27 |
| Ya Naval | Concepcion, 2025-03-05 |
| Ya No Ser | San Isidro, 2023-10-28 |
| Ya Pita | Hipodromo Chile, 2025-01-12 |
| Ya Po | Hipodromo Chile, 2023-11-05 |
| Ya Rayah | Brighton, 2025-10-08 |
| Ya Shisa | Kalgoorlie, 2024-08-11 |
| Ya Silio | Hipodromo Chile, 2025-05-09 |
| Ya Te Conte | Valparaiso Sporting Club, 2025-02-27 |
| Ya Te Dije | Club Hipico Santiago, 2025-05-17 |
| YA YA EFFENDI | |
| Ya'll Come | Los Alamitos Racecourse, 2025-09-13 |
| Yaa Wale | Saint-Cloud, 2025-06-03 |
| Yaahobby | Newcastle, 2025-10-18 |
| Yaajooz | Newcastle, 2025-10-18 |
| Yaanaas | Sandown, 2023-05-26 |
| Yaani | Turfway Park, 2025-03-15 |
| Yaas | Nottingham, 2024-08-01 |
| Yaaser | York, 2025-10-10 |
| Yaazaain | Newton Abbot, 2023-06-28 |
| Yabadabadoo | Sandown-Hillside, 2024-05-25 |
| Yabane | Chukyo, 2025-08-16 |
| Yabba Dabba Dude | Charles Town, 2025-03-21 |
| YABBA GABBA | |
| Yabby Pump | Newcastle, 2025-10-02 |
| Yabe Go Sweet | Funabashi, 2023-08-09 |
| Yabher | Newmarket, 2025-10-10 |
| Yabo | Tramore, 2024-11-26 |
| Yaboroo | Royal Randwick, 2015-10-03 |
| Yabulu Princess | Home Hill, 2022-11-12 |
| Yabusame | Hanshin, 2025-03-23 |
| Yacaaba | Dubbo, 2020-07-17 |
| Yacabu | Concepcion, 2025-01-03 |
| Yacaeran | San Isidro, 2024-09-15 |
| Yachiyo | Moonee Valley, 2025-09-06 |
| Yacht Boy | Woodbine, 2024-12-16 |
| Yacht Club | Bendigo, 2017-06-03 |
| Yacht Girl | Armidale, 2025-02-27 |
| Yacht Intentions | Presque Isle Downs, 2025-05-20 |
| Yacht Rock | Sam Houston Race Park, 2025-03-08 |
| Yachtie | Gosford, 2023-12-21 |
| Yachtsman | Windsor, 2025-08-19 |
| Yachtsmen | Charles Town, 2024-04-06 |
| YACKETY SAX | Devonport Tapeta Synthetic, 2014-06-01 |
| Yacki | Townsville, 2012-03-13 |
| Yacklin | Club Hipico Santiago, 2023-11-04 |
| Yacomo | Strasbourg, 2025-10-05 |
| Yacowlef | Del Mar, 2025-08-18 |
| Yadi | Presque Isle Downs, 2025-10-15 |
| Yadirayadirayadira | Gulfstream, 2025-08-18 |
| Yadreamin' | Ascot, 2021-11-20 |
| Yaebenishidare | Chukyo, 2025-01-26 |
| Yaegiri | Chukyo, 2025-08-09 |
| Yael's Delight | Dubbo, 2025-05-04 |
| Yaella | Hipodromo Chile, 2025-03-28 |
| Yaeno Shine | Mizusawa, 2024-12-29 |
| Yafa | Hipodromo Chile, 2023-09-01 |
| Yafaarr | Redcar, 2025-10-17 |
| Yafi | Mont De Marsan, 2025-08-25 |
| Yagan | Southwell, 2023-03-15 |
| Yaggera | Bordeaux Le Bouscat, 2025-10-21 |