Istvan is a thoroughbred horse born in New Zealand in 2023. Race horse Istvan is by Staphanos (JPN) out of O'sam (NZ). Istvan form is available here. Owned by R S S Racing, Y Nakada, R Nakata, Y Kawaguchi, S Hasegawa, K Izuno, S Aizawa, S W Barrow, T Negishi, R S S O'Sam, T C Bloodstock, J C Mackenzie, J R Montgomery, D J Malady, T J Ivory, High Five, S Malone, Dwyer Racing One, Kratzie Racing 2025 & Kratzie Racing Class of 2025.