Donnacha O'Brien
$348,000
2026 earnings
50%
2026 wins
$1,084,200
lifetime earnings
racing Record
2026 Stats
Career Stats
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1
Firsts
2
0
Seconds
1
1
Thirds
1
0
Unplaced
5
2
Starts
9
$348,000
Earnings
$1,084,200
$174,000
Earnings / Start
$120,467
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Bio
Donnacha O'Brien is the son of legendary Irish trainer Aidan O’Brien and his wife, Anne-Marie. He is one of four O'Brien children and his brother is Breeders' Cup-winning jockey and trainer Joseph O’Brien.
Donnacha O'Brien also got his start as a rider at age 19 in 2014. He was the Irish champion apprentice jockey of 2016 and Irish champion jockey in 2018 and 2019.
Donnacha O'Brien is the son of legendary Irish trainer Aidan O’Brien and his wife, Anne-Marie. He is one of four O'Brien children and his brother is Breeders' Cup-winning jockey and trainer Joseph O’Brien.
Donnacha O'Brien also got his start as a rider at age 19 in 2014. He was the Irish champion apprentice jockey of 2016 and Irish champion jockey in 2018 and 2019.
After shifting careers to focus on training and follow in the footsteps of his father and brother, Donnacha won the Group 1 Moyglare Stud Stakes in 2020 with Shale and added Group 1 wins with Sissoko and Proud And Regal.
Donnacha O'Brien finished second in the 2023 Breeders' Cup Juvenile Fillies Turf with Porta Fortuna and earned his first win in that race in 2025 when Balantina rallied from off the pace to prevail at Del Mar.
