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Trainer profile

Donnacha Aidan O'Brien

Base: Ballyroe, Co Tipperary
Region: IRE

Flat 2026 (GB & IRE): 24 wins from 224 runs (11%)
Prize money Flat 2026 (GB & IRE): £803,820 GB · €1,020,328 IRE
Last 14 days (GB & IRE): 0 wins from 8 runs (0%)
Last winner (GB & IRE): 19 days ago: Shaihaan (IRE), Killarney (IRE)
Career (GB & IRE since 2020): 142 wins from 1,109 runs (13%)

Next entry · 28 Oct · 14:30 Dundalk (AW) · Dundalk Stadium Optional Claiming Race

Form

Flat 2026 season


Flat Turf	184	19	10.3%	46	£803,820	€947,427	15/65	Comanche Brave (IRE)
Flat AW	40	5	12.5%	10	£0	€72,901	4/28	Keepsgettingbetter (IRE)
All races	224	24	10.7%	56	£803,820	€1,020,328	19/74	Comanche Brave (IRE)

GB and IRE. Placed = 2nd or 3rd.

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Members see for Donnacha Aidan O'Brien

RWS scorefor every runner today
Trainer patternscourse, distance and comeback angles
Market movesprice shifts on the yard's runners

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Flat last 5 seasons (2022 to date)


Flat Turf	704	87	12.4%	189	£1,782,285	€3,294,192	56/177	Porta Fortuna (IRE)
Flat AW	122	18	14.8%	32	£0	€268,251	17/80	Keepsgettingbetter (IRE)
All races	826	105	12.7%	221	£1,782,285	€3,562,443	69/192	Porta Fortuna (IRE)

GB and IRE. Placed = 2nd or 3rd.

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Jumps last 5 seasons (2021/22 to date)


Hurdle	4	1	25.0%	0	€8,266	1/1	Kilmeaden (IRE)
All races	4	1	25.0%	0	€8,266	1/1	Kilmeaden (IRE)

GB and IRE. Placed = 2nd or 3rd.

Career (GB and IRE, records from 1990)


Hurdle	4	1	25.0%	0	£0	€8,266	1/1	Kilmeaden (IRE)
Flat Turf	952	114	12.0%	263	£2,071,726	€4,114,471	77/217	Porta Fortuna (IRE)
Flat AW	153	27	17.6%	37	£3,020	€354,426	26/95	Keepsgettingbetter (IRE)
All races	1,109	142	12.8%	300	£2,074,746	€4,477,163	97/234	Porta Fortuna (IRE)

Best horse = most wins in the category.

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Last 14 days runners


23 Oct 26	Dundalk (AW) (IRE)	Irish EBF Median Sires Series Maiden	Flat AW	-	1m	Standard	Final Ascent (USA)	Paddy Harnett	2/14	14/1	-	€5,000
23 Oct 26	Dundalk (AW) (IRE)	Irish EBF Median Sires Series Maiden	Flat AW	-	1m	Standard	Might Just Be (IRE)	Shane Foley	11/14	7/1	-	€0
23 Oct 26	Dundalk (AW) (IRE)	Book Online At DundalkStadium.com Fillies Optional Claiming Race	Flat AW	-	7f	Standard	Near Perfection (IRE)	Paddy Harnett	2/9	9/2	68	€2,000
20 Oct 26	Curragh (IRE)	Staffordstown Stud Stakes	Flat Turf	Group 3	1m	Yielding	Isle Of Capri (IRE)	Gavin Ryan	4/11	18/1	-	€3,501
17 Oct 26	Leopardstown (IRE)	Irish Stallion Farms EBF (C & G) Maiden	Flat Turf	-	7f	Good	Maathoor (IRE)	Chris Hayes	3/12	33/1	-	€2,200
17 Oct 26	Leopardstown (IRE)	Irish Stallion Farms EBF Laidlaw Cup Fillies Maiden	Flat Turf	-	7f	Good	Miss Hong Kong (IRE)	Gavin Ryan	3/13	5/1	-	€2,200
16 Oct 26	Dundalk (AW) (IRE)	James Crowe 1 Year Memorial Nursery Handicap	Flat AW	-	7f	Standard	Hip Hop Chrissy (IRE)	Paddy Harnett	6/13	10/1	74	€300
11 Oct 26	Naas (IRE)	Irish Stallion Farms EBF Garnet Stakes	Flat Turf	Listed	1m	Soft	Glyfada (IRE)	Gavin Ryan	3/16	8/1	93	€5,000

GB and IRE results, most recent first.

Great Britain only


Flat 2026 season	Flat Turf	13	1	7.7%	3	1/11	£803,820
Flat 2026 season	All races	13	1	7.7%	3	1/11	£803,820
Flat last 5 seasons (2022 to date)	Flat Turf	36	5	13.9%	9	2/24	£1,782,285
Flat last 5 seasons (2022 to date)	All races	36	5	13.9%	9	2/24	£1,782,285

GB races only, current and last 5 seasons per code. Placed = 2nd or 3rd.

Additional research statistics and historical returns are in the RaceWatch app.

See Donnacha Aidan O'Brien's runners tomorrow with RWS scores.

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Ireland only


Flat 2026 season	Flat Turf	171	18	10.5%	43	15/63	€947,427
Flat 2026 season	Flat AW	40	5	12.5%	10	4/28	€72,901
Flat 2026 season	All races	211	23	10.9%	53	19/73	€1,020,328
Flat last 5 seasons (2022 to date)	Flat Turf	668	82	12.3%	180	56/176	€3,294,192
Flat last 5 seasons (2022 to date)	Flat AW	122	18	14.8%	32	17/80	€268,251
Flat last 5 seasons (2022 to date)	All races	790	100	12.7%	212	69/192	€3,562,443
Jumps last 5 seasons (2021/22 to date)	Hurdle	4	1	25.0%	0	1/1	€8,266
Jumps last 5 seasons (2021/22 to date)	All races	4	1	25.0%	0	1/1	€8,266

Irish races only, current and last 5 seasons per code. Prize money in euro, never added to GB £.

Additional research statistics and historical returns are in the RaceWatch app.

See Donnacha Aidan O'Brien's runners tomorrow with RWS scores.

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Trackeralerts when your horses are declared

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Quick answers

Where is Donnacha Aidan O'Brien based?: Donnacha Aidan O'Brien is a racehorse trainer based in Ballyroe, Co Tipperary, Ireland.
How many winners has Donnacha Aidan O'Brien had this season?: In the 2026 Flat season, Donnacha Aidan O'Brien has trained 24 winners from 224 runners in Britain and Ireland (11%).
How much prize money has Donnacha Aidan O'Brien won this season?: Donnacha Aidan O'Brien's runners have won £803,820 in Britain and €1,020,328 in Ireland in the 2026 Flat season.
How many winners has Donnacha Aidan O'Brien trained in total?: Donnacha Aidan O'Brien has trained 142 winners from 1,109 runners in Britain and Ireland since 2020 (13%). Runners abroad are not included.
How much prize money has Donnacha Aidan O'Brien won in total?: Donnacha Aidan O'Brien's runners have earned £2,074,746 in Britain and €4,477,163 in Ireland since 2020. Runners abroad are not included.
How many Group or Grade 1 races has Donnacha Aidan O'Brien won?: Donnacha Aidan O'Brien has won 8 Group or Grade 1 races in Britain and Ireland in the last 10 years, most recently with Comanche Brave (IRE) in the BAR 1 Betting Flying Five Stakes (Group 1) at Curragh (IRE) on 13 September 2026.
Who has been Donnacha Aidan O'Brien's most successful horse in the last 12 months?: Donnacha Aidan O'Brien's most successful horse in Britain and Ireland over the last 12 months is Comanche Brave (IRE), with 3 wins.
Where does Donnacha Aidan O'Brien have the most winners?: Curragh (IRE) is Donnacha Aidan O'Brien's most successful course on the Flat since the start of 2022, with 18 winners from 168 runners (11%).
Does Donnacha Aidan O'Brien have any runners coming up?: Donnacha Aidan O'Brien has 4 runners entered or declared in the next 7 days, starting with Near Perfection in the 14:30 at Dundalk (AW) on 28 October 2026.
When did Donnacha Aidan O'Brien last have a winner?: Donnacha Aidan O'Brien's most recent winner in Britain or Ireland was Shaihaan (IRE) at Killarney (IRE) on 5 October 2026.