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Aidan O'Brien Flat horses: 2026 string, runners and form

Every horse Aidan O'Brien has run in the last year, who is declared from today, how the yard is going in 2026 and how its runners perform first time out. Updated every morning, so the horses that have had their first run and are due a second show here as they are declared.

42 declared runners from today (2 today); 170 of the string back this season · Results to 15 October 2026 · Refreshed 16 October 2026
555
Runs 2026
18.7%
Win % 2026
17.8%
First time out win %, ten seasons
42
Declared from today
-9.1 pts

Aidan O'Brien Flat runners won 17.8% of seasonal debuts and 26.9% of second runs over the ten seasons 2016 to 2025, a fresh edge of -9.1 points: wait for run two.Sample: 1,783 seasonal debuts · Window: 2016 to 2025 · Source: RaceWatch results database, GB and IRE runners since May 2014; declarations from RaceWatch racecards

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Return curve: share of the string back by month
Ten-season average, cumulative % of debutsThis season, cumulative % of last season's string
0%50%100%150%200%JanFebMarAprMayJunJulAugSepOctNovDecTen-season average, cumulative % of debuts Jan: 0.7%Ten-season average, cumulative % of debuts Feb: 1.2%Ten-season average, cumulative % of debuts Mar: 8%Ten-season average, cumulative % of debuts Apr: 31.9%Ten-season average, cumulative % of debuts May: 49%Ten-season average, cumulative % of debuts Jun: 64.4%Ten-season average, cumulative % of debuts Jul: 72%Ten-season average, cumulative % of debuts Aug: 80.9%Ten-season average, cumulative % of debuts Sep: 89.1%Ten-season average, cumulative % of debuts Oct: 98.7%Ten-season average, cumulative % of debuts Nov: 100%Ten-season average, cumulative % of debuts Dec: 100%100%This season, cumulative % of last season's string Jan: 0%This season, cumulative % of last season's string Feb: 0%This season, cumulative % of last season's string Mar: 8.8%This season, cumulative % of last season's string Apr: 40.9%This season, cumulative % of last season's string May: 53.8%This season, cumulative % of last season's string Jun: 62%This season, cumulative % of last season's string Jul: 72.5%This season, cumulative % of last season's string Aug: 85.4%This season, cumulative % of last season's string Sep: 95.3%This season, cumulative % of last season's string Oct: 100%100%

Cumulative % returned by Month

Season to date: 2026 to date

55510418.7%21538.7%£8,658,659€5,536,771

Runs under this licence name, Flat races, GB and IRE. Prize money shown separately for Britain (£) and Ireland (€), never added together.

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Strike rate by month
Ten seasons 2016 to 2025This season
0%10%20%30%40%MarAprMayJunJulAugSepOctNovTen seasons 2016 to 2025 Mar: 26.3%26.3%Ten seasons 2016 to 2025 Apr: 22.6%22.6%Ten seasons 2016 to 2025 May: 23.7%23.7%Ten seasons 2016 to 2025 Jun: 18.7%18.7%Ten seasons 2016 to 2025 Jul: 20.7%20.7%Ten seasons 2016 to 2025 Aug: 21.7%21.7%Ten seasons 2016 to 2025 Sep: 18.9%18.9%Ten seasons 2016 to 2025 Oct: 17.6%17.6%Ten seasons 2016 to 2025 Nov: 16.4%16.4%This season Mar: 29.4%29.4%This season Apr: 19.4%19.4%This season May: 23.8%23.8%This season Jun: 21.7%21.7%This season Jul: 12.6%12.6%This season Aug: 21.5%21.5%This season Sep: 15.2%15.2%This season Oct: 13.6%13.6%

Win % by Month

Readiness: seasonal debut v second run

Seasonal debut17.8%1,78331717.0%17129
Second run26.9%1,47539722.7%12829
Third run or later18.8%3,62168118.0%25646

Ten seasons 2016 to 2025. A seasonal debut is a horse's first Flat run of the calendar year, counted across all yards and credited to the yard that ran it. Fresh edge = debut win % minus second-run win %: +2 points or better fires fresh, -2 or worse wait for run two. Fewer than 50 debuts is a small sample. This-season win % shown from 10 runs.

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Declared runners

Monmouth silksMonmouth16 Oct 2617:30Dundalk (AW)No18-7740Flat3Book Online At DundalkStadium.com Maiden
Lake Lugano silksLake Lugano16 Oct 2618:00Dundalk (AW)No11-7530Flat2James Crowe 1 Year Memorial Nursery Handicap
Confucius silksConfucius17 Oct 2612:55AscotNo21--61Flat2Qatar Racing British Champions Day Two-Year-Old Conditions Stakes
Amelia Earhart silksAmelia Earhart17 Oct 2613:30AscotNo35-11061Flat3Qatar Racing British Champions Long Distance Cup (Group 1)
Queenstown silksQueenstown17 Oct 2613:30AscotNo34-11421Flat6Qatar Racing British Champions Long Distance Cup (Group 1)
Captivating silksCaptivating17 Oct 2613:57LeopardstownDebut---00Flat2Irish EBF Fillies Maiden
Speckles silksSpeckles17 Oct 2613:57LeopardstownNo37-9720Flat2Irish EBF Fillies Maiden
Aladdin's Cave silksAladdin's Cave17 Oct 2614:32LeopardstownNo39--10Flat2Irish EBF (C & G) Maiden
Kingdom Of Camelot silksKingdom Of Camelot17 Oct 2614:32LeopardstownNo20--10Flat2Irish EBF (C & G) Maiden
Pirate Of Penzance silksPirate Of Penzance17 Oct 2614:32LeopardstownDebut---00Flat2Irish EBF (C & G) Maiden
Minnie Hauk silksMinnie Hauk17 Oct 2614:40AscotNo58-11951Flat4Qatar Racing British Champions Fillies & Mares Stakes (Group 1)
Sugar Island silksSugar Island17 Oct 2614:40AscotNo58-10240Flat3Qatar Racing British Champions Fillies & Mares Stakes (Group 1)
Albany County silksAlbany County17 Oct 2615:07LeopardstownNo28--31Flat2Mongey Communications Eyrefield Stakes (Group 3)
Wall Street silksWall Street17 Oct 2615:07LeopardstownNo72--11Flat2Mongey Communications Eyrefield Stakes (Group 3)
Gstaad silksGstaad17 Oct 2615:20AscotNo80-12541Flat3Queen Elizabeth II Stakes (Sponsored By Qatar Racing) (Group 1)
Hawk Mountain silksHawk Mountain17 Oct 2615:20AscotNo35-11630Flat3Queen Elizabeth II Stakes (Sponsored By Qatar Racing) (Group 1)
Anymore silksAnymore17 Oct 2615:40LeopardstownDebut---00Flat2Irish Stallion Farms EBF Fillies Maiden
Snowing silksSnowing17 Oct 2615:40LeopardstownNo21-9860Flat2Irish Stallion Farms EBF Fillies Maiden
Constitution River silksConstitution River17 Oct 2616:00AscotNo35-12342Flat3Qatar Racing Champion Stakes (Group 1)
Bengal Tiger silksBengal Tiger17 Oct 2616:15LeopardstownNo6--31Flat2Mongey Communications Killavullan Stakes (Group 3)
Capability Brown silksCapability Brown17 Oct 2616:15LeopardstownNo20-9531Flat2Mongey Communications Killavullan Stakes (Group 3)
Accumulation17 Oct 2616:50LeopardstownDebut---00Flat2Irish Stallion Farms EBF (C & G) Maiden
Imposing silksImposing17 Oct 2616:50LeopardstownNo32--10Flat2Irish Stallion Farms EBF (C & G) Maiden
Walnut Cove17 Oct 2616:50LeopardstownDebut---00Flat2Irish Stallion Farms EBF (C & G) Maiden
City Of Gold silksCity Of Gold17 Oct 2617:20LeopardstownNo39-9130Flat2Irish Stallion Farms EBF Nursery Handicap
King Of Sparta silksKing Of Sparta18 Oct 2614:12LeopardstownNo204-7110Flat3Leopardstown Golf, Padel And Range Maiden
Charles Fort silksCharles Fort18 Oct 2614:42LeopardstownNo23-10330Flat3Bahrain Turf Club Knockaire Stakes (Listed)
Lewis Carroll silksLewis Carroll18 Oct 2614:42LeopardstownNo14-9831Flat3Bahrain Turf Club Knockaire Stakes (Listed)
Come What May silksCome What May18 Oct 2615:42LeopardstownNo22--11Flat3Trigo Stakes (Listed)
Moments of Joy silksMoments of Joy18 Oct 2615:42LeopardstownNo7-9640Flat3Trigo Stakes (Listed)
Purely silksPurely18 Oct 2617:12LeopardstownNo16-6940Flat3Watch Every Irish Race Live On Racing TV Handicap
Aladdin's Cave silksAladdin's Cave19 Oct 2615:10Gowran ParkNo41--10Flat2Irish Stallion Farms EBF Maiden
Book Of Kells19 Oct 2615:10Gowran ParkDebut---00Flat2Irish Stallion Farms EBF Maiden
City Of Gold silksCity Of Gold19 Oct 2615:10Gowran ParkNo41-9130Flat2Irish Stallion Farms EBF Maiden
Conclusive19 Oct 2615:10Gowran ParkDebut---00Flat2Irish Stallion Farms EBF Maiden
Greatest Knight silksGreatest Knight19 Oct 2615:10Gowran ParkNo22--10Flat2Irish Stallion Farms EBF Maiden
Heart Of Fire19 Oct 2615:10Gowran ParkDebut---00Flat2Irish Stallion Farms EBF Maiden
Imposing silksImposing19 Oct 2615:10Gowran ParkNo34--10Flat2Irish Stallion Farms EBF Maiden
Kingdom Of Camelot silksKingdom Of Camelot19 Oct 2615:10Gowran ParkNo22--10Flat2Irish Stallion Farms EBF Maiden
Museum Of Art19 Oct 2615:10Gowran ParkDebut---00Flat2Irish Stallion Farms EBF Maiden
Paraguay silksParaguay19 Oct 2615:10Gowran ParkNo15--10Flat2Irish Stallion Farms EBF Maiden
Pirate Of Penzance silksPirate Of Penzance19 Oct 2615:10Gowran ParkDebut---00Flat2Irish Stallion Farms EBF Maiden

Declarations from today onwards, non-runners removed. Updated as racecards are published.

The string: every horse run in the last 365 days

Monmouth (IRE) silksMonmouth (IRE)Declared16 Oct 26Dundalk (AW)4028 Sep 26743-
Lake Lugano (IRE) silksLake Lugano (IRE)Declared16 Oct 26Dundalk (AW)305 Oct 26-2-
Constitution River (FR) silksConstitution River (FR)Declared17 Oct 26Ascot4212 Sep 261233-
Minnie Hauk (IRE) silksMinnie Hauk (IRE)Declared17 Oct 26Ascot5120 Aug 261214-
Gstaad (GB) silksGstaad (GB)Declared17 Oct 26Ascot4129 Jul 261203-
Hawk Mountain (IRE) silksHawk Mountain (IRE)Declared17 Oct 26Ascot3012 Sep 261163-
Queenstown (IRE) silksQueenstown (IRE)Declared17 Oct 26Ascot2113 Sep 261106-
Amelia Earhart (IRE) silksAmelia Earhart (IRE)Declared17 Oct 26Ascot6112 Sep 261043-
Sugar Island (IRE) silksSugar Island (IRE)Declared17 Oct 26Ascot4020 Aug 261023-
Aladdin's Cave (IRE) silksAladdin's Cave (IRE)Declared17 Oct 26Leopardstown108 Sep 26-2-
Albany County (IRE) silksAlbany County (IRE)Declared17 Oct 26Leopardstown3119 Sep 26-2-
Bengal Tiger (IRE) silksBengal Tiger (IRE)Declared17 Oct 26Leopardstown3111 Oct 26-2-
Capability Brown (IRE) silksCapability Brown (IRE)Declared17 Oct 26Leopardstown3127 Sep 26-2-
City Of Gold (GB) silksCity Of Gold (GB)Declared17 Oct 26Leopardstown308 Sep 26-2-
Confucius (IRE) silksConfucius (IRE)Declared17 Oct 26Ascot6126 Sep 26-2-
Imposing (IRE) silksImposing (IRE)Declared17 Oct 26Leopardstown1015 Sep 26-2-
Kingdom Of Camelot (FR) silksKingdom Of Camelot (FR)Declared17 Oct 26Leopardstown1027 Sep 26-2-
Snowing (IRE) silksSnowing (IRE)Declared17 Oct 26Leopardstown6026 Sep 26-2-
Speckles (IRE) silksSpeckles (IRE)Declared17 Oct 26Leopardstown2010 Sep 26-2-
Wall Street (GB) silksWall Street (GB)Declared17 Oct 26Leopardstown116 Aug 26-2-
Charles Fort (GB) silksCharles Fort (GB)Declared18 Oct 26Leopardstown3025 Sep 261033-
Moments Of Joy (USA) silksMoments Of Joy (USA)Declared18 Oct 26Leopardstown4011 Oct 26983-
Lewis Carroll (IRE) silksLewis Carroll (IRE)Declared18 Oct 26Leopardstown314 Oct 26853-
Purely (IRE) silksPurely (IRE)Declared18 Oct 26Leopardstown402 Oct 26633-
Come What May (IRE) silksCome What May (IRE)Declared18 Oct 26Leopardstown1126 Sep 26-3-
King Of Sparta (IRE) silksKing Of Sparta (IRE)Declared18 Oct 26Leopardstown1028 Mar 26-3-
Greatest Knight (IRE) silksGreatest Knight (IRE)Declared19 Oct 26Gowran Park1027 Sep 26-2-
Paraguay (USA) silksParaguay (USA)Declared19 Oct 26Gowran Park104 Oct 26-2-
Delacroix (IRE) silksDelacroix (IRE)Not yet returned--0018 Oct 251264-
January (IRE) silksJanuary (IRE)Not yet returned--0018 Oct 251144-
Stay True (IRE) silksStay True (IRE)Not yet returned--0018 Oct 251134-
Bedtime Story (IRE) silksBedtime Story (IRE)Not yet returned--0018 Oct 251114-
Exactly (IRE) silksExactly (IRE)Not yet returned--0018 Oct 251104-
Mount Kilimanjaro (FR) silksMount Kilimanjaro (FR)Not yet returned--0018 Oct 251084-
Shackleton (IRE) silksShackleton (IRE)Not yet returned--0019 Oct 251064-
Acapulco Bay (IRE) silksAcapulco Bay (IRE)Not yet returned--0019 Oct 251044-
Daytona (IRE) silksDaytona (IRE)Not yet returned--0018 Oct 251033-
Island Hopping (IRE) silksIsland Hopping (IRE)Not yet returned--002 Nov 251024-
Ballet Slippers (IRE) silksBallet Slippers (IRE)Not yet returned--007 Nov 25994-
Smiling (IRE) silksSmiling (IRE)Not yet returned--007 Nov 25984-
Isambard Brunel (USA) silksIsambard Brunel (USA)Not yet returned--0016 Oct 25924-
Eternal Spirit (IRE) silksEternal Spirit (IRE)Not yet returned--002 Nov 25834-
Two For Joy (IRE) silksTwo For Joy (IRE)Not yet returned--002 Nov 25834-
Gifted (IRE) silksGifted (IRE)Not yet returned--002 Nov 25824-
Tea Rose (IRE) silksTea Rose (IRE)Not yet returned--007 Nov 25804-
Head To Head (IRE) silksHead To Head (IRE)Not yet returned--0031 Oct 25764-
Happiest (IRE) silksHappiest (IRE)Not yet returned--0021 Oct 25734-
Appeared (USA) silksAppeared (USA)Not yet returned--0016 Oct 25-4-
Circle Of Life (IRE) silksCircle Of Life (IRE)Not yet returned--0018 Oct 25-3-
Dramatic (USA) silksDramatic (USA)Not yet returned--0031 Oct 25-4-
Ex Animo (IRE) silksEx Animo (IRE)Not yet returned--0018 Oct 25-3-
Il Corsaro (IRE) silksIl Corsaro (IRE)Not yet returned--002 Nov 25-3-
Mt Rushmore (IRE) silksMt Rushmore (IRE)Not yet returned--0020 Oct 25-3-
Paul Henry (IRE) silksPaul Henry (IRE)Not yet returned--0022 Oct 25-4-
Take A Bow (IRE) silksTake A Bow (IRE)Not yet returned--0029 Oct 25-3-
Scandinavia (USA) silksScandinavia (USA)Returned this season--5513 Sep 261254-
Jan Brueghel (IRE) silksJan Brueghel (IRE)Returned this season--4113 Sep 261205-
Lambourn (IRE) silksLambourn (IRE)Returned this season--5112 Sep 261194-
Christmas Day (IRE) silksChristmas Day (IRE)Returned this season--6212 Sep 261183-
The Lion In Winter (IRE) silksThe Lion In Winter (IRE)Returned this season--2116 May 261174-
Pierre Bonnard (IRE) silksPierre Bonnard (IRE)Returned this season--6012 Sep 261163-
Precise (IRE) silksPrecise (IRE)Returned this season--5212 Sep 261153-
Benvenuto Cellini (IRE) silksBenvenuto Cellini (IRE)Returned this season--3225 Jul 261143-
Diamond Necklace (IRE) silksDiamond Necklace (IRE)Returned this season--1130 Jul 261133-
Mission Central (IRE) silksMission Central (IRE)Returned this season--6313 Sep 261133-
Puerto Rico (IRE) silksPuerto Rico (IRE)Returned this season--3022 Aug 261133-
True Love (IRE) silksTrue Love (IRE)Returned this season--5212 Sep 261133-
Italy (GB) silksItaly (GB)Returned this season--2018 Jun 261113-
Isaac Newton (IRE) silksIsaac Newton (IRE)Returned this season--7212 Sep 261103-
Twain (IRE) silksTwain (IRE)Returned this season--1019 Apr 261104-
Action (IRE) silksAction (IRE)Returned this season--805 Oct 261093-
Causeway (IRE) silksCauseway (IRE)Returned this season--4419 Jun 261083-
Edward Hamilton (IRE) silksEdward Hamilton (IRE)Returned this season--3024 May 261084-
Giant Sequoia (USA) silksGiant Sequoia (USA)Returned this season--4213 Sep 261082-
Illinois (IRE) silksIllinois (IRE)Returned this season--6121 Aug 261085-
Albert Einstein (IRE) silksAlbert Einstein (IRE)Returned this season--4019 Jun 261073-
Charles Darwin (IRE) silksCharles Darwin (IRE)Returned this season--4118 Jul 261073-
Neolithic (IRE) silksNeolithic (IRE)Returned this season--4120 Jun 261073-
Expanded (IRE) silksExpanded (IRE)Returned this season--3012 Sep 261064-
Florida Bay (IRE) silksFlorida Bay (IRE)Returned this season--6213 Sep 261062-
Beautify (IRE) silksBeautify (IRE)Returned this season--4018 Jul 261043-
Alpha (IRE) silksAlpha (IRE)Returned this season--5213 Sep 261032-
Piazza San Marco (USA) silksPiazza San Marco (USA)Returned this season--2012 Sep 261023-
Brussels (GB) silksBrussels (GB)Returned this season--7027 Sep 261013-
Cameo (IRE) silksCameo (IRE)Returned this season--7110 Sep 261013-
Composing (IRE) silksComposing (IRE)Returned this season--3018 Jul 261013-
Minerva (IRE) silksMinerva (IRE)Returned this season--2012 Aug 261013-
New Zealand (IRE) silksNew Zealand (IRE)Returned this season--3020 Jun 261013-
Port Of Spain (IRE) silksPort Of Spain (IRE)Returned this season--5027 Sep 261013-
Shakespeare (GB) silksShakespeare (GB)Returned this season--5126 Sep 261012-
Amadeus Mozart (IRE) silksAmadeus Mozart (IRE)Returned this season--6013 Sep 261003-
Dorset (IRE) silksDorset (IRE)Returned this season--6012 Sep 261003-
Ibelieveicanfly (USA) silksIbelieveicanfly (USA)Returned this season--6112 Sep 261002-
Bloom (IRE) silksBloom (IRE)Returned this season--408 Jul 26993-
Mississippi River (IRE) silksMississippi River (IRE)Returned this season--4017 Jun 26994-
Straight Up (IRE) silksStraight Up (IRE)Returned this season--3113 Jul 26993-
Warsaw (IRE) silksWarsaw (IRE)Returned this season--1012 Apr 26993-
Flushing Meadows (USA) silksFlushing Meadows (USA)Returned this season--504 Jul 26983-
Nevermindtherain (IRE) silksNevermindtherain (IRE)Returned this season--6019 Sep 26982-
South Dakota (IRE) silksSouth Dakota (IRE)Returned this season--612 Oct 26982-
Trojan Warrior (USA) silksTrojan Warrior (USA)Returned this season--2027 Apr 26983-
Accredited (FR) silksAccredited (FR)Returned this season--2117 May 26973-
Signora (IRE) silksSignora (IRE)Returned this season--4110 May 26933-
Cape Cod (IRE) silksCape Cod (IRE)Returned this season--1112 Apr 26923-
Port Ferdinand (IRE) silksPort Ferdinand (IRE)Returned this season--2017 May 26923-
Drop Dead Gorgeous (IRE) silksDrop Dead Gorgeous (IRE)Returned this season--8111 Oct 26913-
River Ara (IRE) silksRiver Ara (IRE)Returned this season--301 Jun 26913-
Classiest (IRE) silksClassiest (IRE)Returned this season--4011 Oct 26903-
Madam Secretary (IRE) silksMadam Secretary (IRE)Returned this season--4014 Aug 26892-
Venosa (USA) silksVenosa (USA)Returned this season--203 Aug 26893-
Antigua (IRE) silksAntigua (IRE)Returned this season--5119 Aug 26873-
Extravagant (IRE) silksExtravagant (IRE)Returned this season--1012 Apr 26853-
Garden Party (IRE) silksGarden Party (IRE)Returned this season--315 Oct 26853-
Ice Dancer (IRE) silksIce Dancer (IRE)Returned this season--608 Sep 26853-
New Yorker (USA) silksNew Yorker (USA)Returned this season--5110 Oct 26842-
Cosmetic (IRE) silksCosmetic (IRE)Returned this season--6015 Oct 26793-
White Sand Beach (USA) silksWhite Sand Beach (USA)Returned this season--811 Oct 26793-
Bold Commander (IRE) silksBold Commander (IRE)Returned this season--6029 Sep 26782-
Film Set (USA) silksFilm Set (USA)Returned this season--4011 Oct 26772-
Institute (IRE) silksInstitute (IRE)Returned this season--514 Oct 26773-
Cape Primrose (IRE) silksCape Primrose (IRE)Returned this season--3019 Jul 26763-
Camelot Queen (IRE) silksCamelot Queen (IRE)Returned this season--5026 Sep 26723-
Pink Coral (IRE) silksPink Coral (IRE)Returned this season--508 Sep 26713-
Cactus (IRE) silksCactus (IRE)Returned this season--404 Jul 26683-
Closely (IRE) silksClosely (IRE)Returned this season--305 Oct 26683-
Captain James Cook (GB) silksCaptain James Cook (GB)Returned this season--7015 Oct 26612-
Aachen (USA) silksAachen (USA)Returned this season--107 Oct 26-2-
Aachen (USA) silksAachen (USA)Returned this season--1015 Aug 26-2-
Abraham Lincoln (GB) silksAbraham Lincoln (GB)Returned this season--2111 Jul 26-2-
Aix La Chapelle (USA) silksAix La Chapelle (USA)Returned this season--2123 Jul 26-2-
Anthony Of Lisbon (GB) silksAnthony Of Lisbon (GB)Returned this season--3015 Oct 26-2-
Be In Love (IRE) silksBe In Love (IRE)Returned this season--3011 Oct 26-2-
Beach (IRE) silksBeach (IRE)Returned this season--308 Oct 26-2-
Biennale (USA) silksBiennale (USA)Returned this season--1015 Apr 26-3-
Canary Island (IRE) silksCanary Island (IRE)Returned this season--103 Apr 26-3-
Capability Brown (IRE) silksCapability Brown (IRE)Returned this season--1013 Jul 26-2-
Carry The Flag (IRE) silksCarry The Flag (IRE)Returned this season--1029 Oct 26-2-
Choctaw Nation (IRE) silksChoctaw Nation (IRE)Returned this season--107 Oct 26-2-
Darkness Falls (IRE) silksDarkness Falls (IRE)Returned this season--1023 Jul 26-2-
Darkness Falls (IRE) silksDarkness Falls (IRE)Returned this season--3310 Oct 26-2-
Druids Glen (IRE) silksDruids Glen (IRE)Returned this season--1023 Apr 26-3-
Drumbeat (IRE) silksDrumbeat (IRE)Returned this season--2110 Oct 26-2-
Drumbeat (IRE) silksDrumbeat (IRE)Returned this season--311 Sep 26-2-
Exceptionally (USA) silksExceptionally (USA)Returned this season--609 Oct 26-2-
Fairylike (USA) silksFairylike (USA)Returned this season--3030 Sep 26-3-
Flower Forest (IRE) silksFlower Forest (IRE)Returned this season--315 Sep 26-3-
George Stubbs (IRE) silksGeorge Stubbs (IRE)Returned this season--1028 Mar 26-3-
Golden Ring (IRE) silksGolden Ring (IRE)Returned this season--419 Oct 26-2-
Great Barrier Reef (IRE) silksGreat Barrier Reef (IRE)Returned this season--5310 Oct 26-2-
Haffner (USA) silksHaffner (USA)Returned this season--6326 Sep 26-2-
Haven (IRE) silksHaven (IRE)Returned this season--1028 Jul 26-2-
Haven (IRE) silksHaven (IRE)Returned this season--319 Oct 26-2-
Heaven's Glory (IRE) silksHeaven's Glory (IRE)Returned this season--1024 May 26-2-
Hereafter (IRE) silksHereafter (IRE)Returned this season--1019 Sep 26-2-
Hmas Perth (USA) silksHmas Perth (USA)Returned this season--214 Oct 26-2-
Hmas Perth (USA) silksHmas Perth (USA)Returned this season--1027 Jul 26-2-
Ile de France (USA) silksIle de France (USA)Returned this season--2115 Aug 26-2-
Iveagh House (IRE) silksIveagh House (IRE)Returned this season--2010 Oct 26-2-
Kepler (IRE) silksKepler (IRE)Returned this season--109 Apr 26-3-
Kingdom Of Camelot (FR) silksKingdom Of Camelot (FR)Returned this season--1029 Aug 26-2-
Knight's Honour (IRE) silksKnight's Honour (IRE)Returned this season--1010 Oct 26-2-
Magna Cum Laude (USA) silksMagna Cum Laude (USA)Returned this season--207 Oct 26-2-
Major Triumph (IRE)Returned this season--1011 Oct 26-2-
Man's Best Friend (IRE) silksMan's Best Friend (IRE)Returned this season--3230 Jul 26-2-
Marco Polo (IRE) silksMarco Polo (IRE)Returned this season--519 Oct 26-2-
Maximilien Luce (IRE) silksMaximilien Luce (IRE)Returned this season--2015 Oct 26-2-
Musical Chimes (IRE) silksMusical Chimes (IRE)Returned this season--1015 Apr 26-3-
Noble Exhibit (IRE) silksNoble Exhibit (IRE)Returned this season--3226 Sep 26-2-
Noble Irish (IRE) silksNoble Irish (IRE)Returned this season--2021 Sep 26-3-
Oklahoma (USA) silksOklahoma (USA)Returned this season--4022 Sep 26-2-
Ophelia (IRE) silksOphelia (IRE)Returned this season--208 Oct 26-2-
Orchestrating (IRE) silksOrchestrating (IRE)Returned this season--103 Jun 26-2-
Palazzo Serristori (USA) silksPalazzo Serristori (USA)Returned this season--1016 Aug 26-2-
Pendulum (IRE) silksPendulum (IRE)Returned this season--103 Apr 26-3-
Petticoat Bay (USA) silksPetticoat Bay (USA)Returned this season--104 Oct 26-2-
Proposition (IRE) silksProposition (IRE)Returned this season--106 May 26-3-
Raging Bull (IRE) silksRaging Bull (IRE)Returned this season--2127 Sep 26-2-
Scientific (IRE) silksScientific (IRE)Returned this season--2010 Apr 26-3-
Sergei Diaghilev (IRE) silksSergei Diaghilev (IRE)Returned this season--5210 Oct 26-2-
Shaftesbury Avenue (USA) silksShaftesbury Avenue (USA)Returned this season--3117 May 26-3-
So Lovely (USA) silksSo Lovely (USA)Returned this season--4129 Aug 26-2-
Somebody Loves Me (GB) silksSomebody Loves Me (GB)Returned this season--102 Oct 26-2-
Speakers Corner (IRE) silksSpeakers Corner (IRE)Returned this season--1022 Sep 26-2-
Speakers Corner (IRE) silksSpeakers Corner (IRE)Returned this season--201 Aug 26-2-
Speckles (IRE) silksSpeckles (IRE)Returned this season--209 Aug 26-2-
Sun Goddess (IRE) silksSun Goddess (IRE)Returned this season--8626 Sep 26-2-
Tantardini (USA) silksTantardini (USA)Returned this season--1016 May 26-2-
Thomas Chippendale (IRE) silksThomas Chippendale (IRE)Returned this season--2016 Aug 26-2-
Thomas Chippendale (IRE) silksThomas Chippendale (IRE)Returned this season--1026 Sep 26-2-
Together Now (USA) silksTogether Now (USA)Returned this season--205 Oct 26-3-
True Sovereign (USA) silksTrue Sovereign (USA)Returned this season--1010 Oct 26-2-
Victorious (IRE) silksVictorious (IRE)Returned this season--3317 Jun 26-2-
Victory Speech (IRE) silksVictory Speech (IRE)Returned this season--1012 Sep 26-2-
Victory Speech (IRE) silksVictory Speech (IRE)Returned this season--211 Aug 26-2-
Vienna Waltz (IRE) silksVienna Waltz (IRE)Returned this season--1017 Sep 26-2-
Wedding (IRE) silksWedding (IRE)Returned this season--3017 May 26-3-
West Of Eden (IRE) silksWest Of Eden (IRE)Returned this season--3117 Jul 26-2-
Endorsement (IRE) silksEndorsement (IRE)Left yard--4118 Jun 261073Joseph Patrick O'Brien
Rock Of Cashel (IRE) silksRock Of Cashel (IRE)Left yard--0019 Oct 251014Niels Petersen
Genealogy (GB) silksGenealogy (GB)Left yard--0019 Oct 25954Faye Bramley
Mont St Michel (IRE) silksMont St Michel (IRE)Left yard--0021 Oct 25955Denis Gerard Hogan
Saratoga (IRE) silksSaratoga (IRE)Left yard--0018 Oct 25884Padraig Roche
Archers Bay (IRE) silksArchers Bay (IRE)Left yard--0020 Oct 25-3Marco Botti
Lord Byron (IRE) silksLord Byron (IRE)Left yard--0022 Oct 25-4Faye Bramley
Maestro Bernstein (IRE) silksMaestro Bernstein (IRE)Left yard--0019 Oct 25-4Antony Brittain

Every horse to run for the yard in Flat races in the 365 days to 15 Oct 2026. Status: Declared (next declaration and course), Returned this season, Not yet returned, or Left yard (last ran for another trainer). Last OR is the official rating carried on its last run for the yard. This table lists the whole string, so it can exceed 50 rows.

Top 25 by peak official rating

Jan Brueghel (IRE) silksJan Brueghel (IRE)126120Returned this season--413 Sep 2626 Jul 255
Delacroix (IRE) silksDelacroix (IRE)126126Not yet returned--018 Oct 2518 Oct 254
Scandinavia (USA) silksScandinavia (USA)125125Returned this season--513 Sep 2613 Sep 264
Constitution River (FR) silksConstitution River (FR)124123Declared17 Oct 26Ascot412 Sep 2619 Aug 263
Minnie Hauk (IRE) silksMinnie Hauk (IRE)123121Declared17 Oct 26Ascot520 Aug 2625 Jul 264
Lambourn (IRE) silksLambourn (IRE)120119Returned this season--512 Sep 266 Jun 264
Gstaad (GB) silksGstaad (GB)120120Declared17 Oct 26Ascot429 Jul 2629 Jul 263
Expanded (IRE) silksExpanded (IRE)118106Returned this season--312 Sep 263 May 254
Christmas Day (IRE) silksChristmas Day (IRE)118118Returned this season--612 Sep 2612 Sep 263
Puerto Rico (IRE) silksPuerto Rico (IRE)118113Returned this season--322 Aug 2629 Jul 263
The Lion In Winter (IRE) silksThe Lion In Winter (IRE)118117Returned this season--216 May 2615 May 254
Hawk Mountain (IRE) silksHawk Mountain (IRE)117116Declared17 Oct 26Ascot312 Sep 2619 Aug 263
Pierre Bonnard (IRE) silksPierre Bonnard (IRE)116116Returned this season--612 Sep 2612 Sep 263
True Love (IRE) silksTrue Love (IRE)116113Returned this season--512 Sep 2624 May 263
Illinois (IRE) silksIllinois (IRE)116108Returned this season--621 Aug 267 May 265
Action (IRE) silksAction (IRE)115109Returned this season--85 Oct 2624 Apr 263
Mission Central (IRE) silksMission Central (IRE)115113Returned this season--613 Sep 2611 Jul 263
Precise (IRE) silksPrecise (IRE)115115Returned this season--512 Sep 2612 Sep 263
January (IRE) silksJanuary (IRE)115114Not yet returned--018 Oct 2513 Sep 254
Sun Goddess (IRE) silksSun Goddess (IRE)114-Returned this season--826 Sep 2613 Sep 262
Benvenuto Cellini (IRE) silksBenvenuto Cellini (IRE)114114Returned this season--325 Jul 2625 Jul 263
Diamond Necklace (IRE) silksDiamond Necklace (IRE)113113Returned this season--130 Jul 2630 Jul 263
Stay True (IRE) silksStay True (IRE)113113Not yet returned--018 Oct 2518 Oct 254
Beautify (IRE) silksBeautify (IRE)112104Returned this season--418 Jul 2615 Apr 263
Italy (GB) silksItaly (GB)112111Returned this season--218 Jun 2612 Apr 263

Current string (horses that have not left the yard), ranked by highest official rating carried in any Flat run in our records since May 2014.

Return curve: when the string comes back

Jan0.7%0.0%0.7%130
Feb1.2%0.0%0.5%90
Mar8.0%8.8%6.7%12015
Apr31.9%40.9%23.9%42755
May49.0%53.8%17.1%30522
Jun64.4%62.0%15.4%27514
Jul72.0%72.5%7.5%13418
Aug80.9%85.4%8.9%15922
Sep89.1%95.3%8.2%14617
Oct98.7%100.0%9.6%1718
Nov100.0%-1.3%24-
Dec100.0%-0.0%0-

Month of each horse's seasonal debut for the yard, ten seasons 2016 to 2025 pooled. This season is measured against the number of horses that made a seasonal debut for the yard last season (171).

Season by season

202618.7%55510438.7%£8,658,659€5,536,771
202523.3%61414346.9%£8,118,659€6,881,220
202424.8%65416248.9%£8,338,346€6,217,500
202322.5%56812845.6%£6,456,282€6,468,288
202221.3%56312043.3%£2,819,786€4,428,888
202116.8%59410037.4%£3,353,428€3,475,345
202017.9%64911638.2%£2,463,090€4,152,800
201916.6%86714438.1%£7,686,578€7,420,477
201820.2%88117842.1%£6,279,555€6,531,517
201721.4%72415546.1%£8,335,028€6,306,919
201619.5%76514946.5%£8,130,756€4,922,611

Runs under this licence name only. Partnership licences start a new record.

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

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Courses

Curragh (IRE)21.8%73916143.8%15429
Leopardstown (IRE)21.8%4499846.3%6712
Naas (IRE)27.4%2346449.6%5212
Ascot12.0%2092528.2%367
Dundalk (AW) (IRE)24.1%1704155.9%103
Navan (IRE)31.2%1414456.7%215
Gowran Park (IRE)22.1%1132548.7%184
Cork (IRE)15.4%1041644.2%232
Newmarket11.7%1031229.1%266
Galway (IRE)22.1%861950.0%161
York17.8%731338.4%182
Tipperary (IRE)18.1%721337.5%00
Killarney (IRE)29.5%611855.7%111
Doncaster17.0%47846.8%90
Fairyhouse (IRE)10.9%46528.3%52
Goodwood24.4%411039.0%133
Epsom20.0%40832.5%101
Listowel (IRE)33.3%391348.7%50
Limerick (IRE)25.0%32840.6%21

Five seasons 2021 to 2025, minimum 30 runs, top 40 by runs.

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Race type splits

Turf21.7%2,82061218.2%53798Race type
AW23.7%1734135.7%145Race type
Other non-handicap27.5%1,30135819.5%24648Race level
Group 2 or 320.2%64813119.4%13426Race level
Group 116.1%3986416.5%9115Race level
Listed16.8%3586022.4%5813Race level
Handicap13.9%288407.7%262Race level
IRE22.9%2,37754418.5%42178Region
GB17.7%61610919.4%13426Region
3yo17.9%1,61528913.8%27638Age
2yo26.5%1,18931523.0%23554Age
4yo+25.9%1894927.3%4412Age

Five seasons 2021 to 2025, minimum 30 runs. Race type is surface (Turf or AW). Handicaps identified from the race title. This-season win % shown from 10 runs.

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Strike rate by month

Jan-161-00
Feb-224-00
Mar26.3%1333529.4%175
Apr22.6%55412519.4%6212
May23.7%90021323.8%8420
Jun18.7%1,14921521.7%8318
Jul20.7%96319912.6%8711
Aug21.7%92920221.5%7917
Sep18.9%1,01919315.2%9915
Oct17.6%1,05818613.6%446
Nov16.4%12821-00
Dec-81-00

Ten seasons 2016 to 2025 pooled; win % shown from 30 runs (10 for this season).

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Strike rate season by season
10%15%20%25%30%20162017201820192020202120222023202420252026Strike rate 2016: 19.5%Strike rate 2017: 21.4%Strike rate 2018: 20.2%Strike rate 2019: 16.6%Strike rate 2020: 17.9%Strike rate 2021: 16.8%Strike rate 2022: 21.3%Strike rate 2023: 22.5%Strike rate 2024: 24.8%Strike rate 2025: 23.3%Strike rate 2026: 18.7%18.7%

Win % by Season

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Which Aidan O'Brien Flat horses are declared to run?

Aidan O'Brien's declared runners table lists every horse entered from today, 42 at the latest count, with course, off time, days since the last run and a first time out flag.

How do Aidan O'Brien Flat horses go first time out?

Below the yard's own second run figure. Aidan O'Brien's seasonal debutants won 17.8% over 2016 to 2025, rising to 26.9% on the second run of the season.

How is Aidan O'Brien doing in 2026?

Aidan O'Brien's 2026 record stands at 104 wins from 555 runs, 18.7% with 215 placed, and the season by season table sets that against the last ten Flat seasons.

Which Aidan O'Brien Flat horses are still to return?

Aidan O'Brien's string table marks every horse run in the last year as returned, declared or not yet returned. 27 have yet to reappear, and the top rated table picks out the best of them.

Which courses suit Aidan O'Brien's runners?

Aidan O'Brien's courses table ranks every track used over 2021 to 2025 by runs, with win %

Questions people ask

How many horses does Aidan O'Brien train?

The string table lists every horse Aidan O'Brien has run in the last 365 days, 205 at today's count. Of those, 170 have run in 2026 so far and 27 are still to reappear.

Do Aidan O'Brien Flat horses win first time out?

Over 2016 to 2025 Aidan O'Brien's seasonal debutants won 17.8%, below the 26.9% on second runs. Aidan O'Brien's horses have usually needed a run, so the second start of the season has been the stronger pointer.

Which Aidan O'Brien Flat horses are running today?

The declared runners table shows 42 of Aidan O'Brien's string entered from today, 2 of them running today. Each row shows the course, off time, days off and whether the horse is making its seasonal debut.

Where do the Aidan O'Brien figures come from?

Results come from the RaceWatch results database of British and Irish racing, with declarations from RaceWatch racecards. The page refreshes every morning, so the string, declared runners and season figures change as Aidan O'Brien runs horses.

More free data

Yard filesEvery trainer file in one indexReady or notWhich yards fire first time out todayWho's backHorses returning from a break todayLeaderboardsLeading trainers and jockeys in 2026Andrew Balding Flat horsesAnother Flat yard fileRacing reportsMonthly reports and the annual review

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