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Jockey profile

Aileen O'Sullivan

79 rides in the last 5 seasons · 20 individual horses
As at 3 Nov 2026 · KTB archive: 2005–present, updated daily
Last ride 142 days ago
Last 5 seasons Lifetime (2014→)
from 1 Jan 2022
2–79
Wins / Runs
2.5%
Strike rate
n=79
7 (9%)
Placed
1.06
Fair A/E
n=79 · 0.85 incl. margin
−31.00
£1 level stake
n=79 at SP · −39.2%
£33,028
Prize money (window)
Strike by season
0%
KTB at a glance S Michael Millar: 1.5% from 65 Claiming: 2.6%

Riding patterns

the angles behind the record · vs 2.5% baseline
First ride on the horse · first captured pairing
0%−2.5
n=18 · A/E 0.00 · £1 −18.00
Last-time-out winners · previous run was a win
0%−2.5
n=2 · A/E 0.00 · £1 −2.00
Fresh horses · 61+ days off
5.9%+3.4
n=17 · A/E 3.51 · £1 +24.00
Claiming rides · riding with a claim
2.6%+0.1
n=78 · A/E 1.07 · £1 −30.00
Big fields · 14+ runners
0%−2.5
n=37 · A/E 0.00 · £1 −37.00
Group / Graded races · pattern & listed
0%−2.5
n=1 · A/E 0.00 · £1 −1.00

Each tile is the record in that situation vs the 2.5% baseline — descriptive splits with the sample always shown, for you to weigh. Tiles under 30 runs render muted. First rides are the first captured pairing of horse and rider; last-time-out winners are horses whose previous captured run was a win; claiming rides are runs where the rider carried a weight claim. Group / Graded covers pattern and listed races.

Notable angles

vs their own baseline
In Flat races 0% vs 2.5% · n=31
With S Michael Millar 1.5% vs 2.5% · n=65 · A/E 0.69
Descriptive splits ranked by divergence × sample — insight, not instruction. Every angle carries its N; nothing under 30 runs qualifies. Rows within 2pts of the baseline appear only when the market-relative read (Fair A/E) diverges, and show it.

Record by conditions

same window as header

Race type

TypeRWSR£1
Flat 31 0 0% −31.00
Hurdle 26 0 0% −26.00
Chase 14 1 7.1% +27.00
NH Flat 8 1 12.5% −1.00

Going

GoingRWSR£1
Good 24 2 8.3% +24.00
Soft 20 0 0% −20.00
Standard (AW) 16 0 0% −16.00
Good to Soft 11 0 0% −11.00
Heavy 8 0 0% −8.00

Courses

CourseRWSR£1
Dundalk (AW) 16 0 0% −16.00
Downpatrick 9 1 11.1% +32.00
Fairyhouse 9 1 11.1% −2.00
Down Royal 5 0 0% −5.00
Kilbeggan 4 0 0% −4.00
Wexford 4 0 0% −4.00
Sligo 4 0 0% −4.00
Navan 4 0 0% −4.00
Galway 3 0 0% −3.00
Tipperary 3 0 0% −3.00
Clonmel 3 0 0% −3.00
Bellewstown 3 0 0% −3.00
Naas 2 0 0% −2.00
Curragh 2 0 0% −2.00
Punchestown 2 0 0% −2.00

Class

ClassRWSR£1
Class 1 1 0 0% −1.00
Class 2 1 0 0% −1.00
Class 5 1 0 0% −1.00

Market position

In the bettingRWSRA/E£1
2nd–3rd fav 1 0 0% 0.00 −1.00
4th–6th fav 12 1 8.3% 1.42 −5.00
7th+ in betting 66 1 1.5% 0.85 −25.00
Fair A/E per band is the tell: near 1.00 the market had it priced right; well above, the wins came where the market didn't expect them.

Rows below n=30 are shown faded — a small sample is a fact, not a trend. Every figure carries its N.

Horses ridden

same window as header · most-raced first
HorseRWPlLast ran
San Martino (IRE) 14 0 2 29 Jun 24
Drimsree Lad (IRE) 12 0 2 16 Dec 23
Deo Bellator (IRE) 10 0 0 1 Oct 23
Robin De Roost (IRE) 6 1 1 17 Aug 24
Carnival Spirit (IRE) 5 0 0 19 Nov 25
Hague Convention (IRE) 5 0 0 29 Nov 23
Breagagh (IRE) 4 0 0 29 Aug 24
Samaritaine (GB) 4 0 0 25 Apr 22
Arctic Craft (IRE) 3 1 1 22 Nov 25
Paymelater (IRE) 3 0 0 1 Nov 25
Loughdoo (IRE) 2 0 0 29 Nov 25
Kalamkan (USA) 2 0 0 7 Aug 22
All 20 horses ridden in this window. Runs, wins and places only: a strike rate or a return on a handful of runs is noise, so none is quoted per horse — each horse's full record is on its own page.

By month

strike by month, 5 seasons
JFMAMJJASOND
0000090001700
Muted months are small samples (under 30 runs) — read them with the caution they deserve.

Riding for

same window · biggest samples first
Main yardS Michael Millar
82% of all rides
1.5% SR · A/E 0.69
TrainerRWSR£1
S Michael Millar 65 1 1.5% −58.00
Muted rows are under 30 rides and sit behind "Show all".

Career highlights

lifetime archive, 2014→
3
Archived wins
£51,515
Prize money
2024
Best season · 2 wins
Robin De Roost (IRE) — Download The New Tote App Handicap Chase (0-109) Downpatrick · Jun 2024
£6,490
American Image (IRE) — Clonmel Handicap Chase Clonmel · Oct 2020
£6,490
Arctic Craft (IRE) — Morgan Fuels Supporting Louth GAA (Ladies Pro/Am) Flat Race Fairyhouse · Oct 2024
£5,900
Notable horses
American Image (IRE) Robin De Roost (IRE) Arctic Craft (IRE)

Sires of the horses ridden

progeny record · win % by ground and trip
The Gurkha (IRE) 0% · 0–14
Progeny have won 9.7% of 2,029 runs since 2020 (127 horses). Strongest on Good to Firm going: 13.7% from 183. Weakest on Heavy going: 2.9% from 105. Weakest over 2m1f – 2m4f (all codes): 6.3% from 111.
Mr Combustible (IRE) 0% · 0–12
Progeny have won 6.9% of 638 runs since 2008 (53 horses).
Getaway (GER) 0% · 0–10
Progeny have won 11.3% of 10,971 runs since 2016 (1,029 horses). Strongest on Good to Firm going: 23.1% from 134.
Robin Des Pres (FR) 16.7% · 1–6
Progeny have won 9.2% of 2,800 runs since 2008 (229 horses).
Lawman (FR) 0% · 0–5
Progeny have won 8.9% of 9,427 runs since 2011 (730 horses).
Lope Y Fernandez (IRE) 0% · 0–5
Progeny have won 10.9% of 716 runs since 2025 (103 horses). Weakest on Good going: 7.1% from 168. Strongest over 1m – 1m1f (all codes): 14.2% from 134. Weakest at trips under 6f (all codes): 7.7% from 104.
Top line: the rider's own record with each sire's runners (win %, wins–runs), same window as the header; faded under 30 runs. Beneath it: every run by that sire's progeny in our archive since 2008, as at 3 Nov 2026 — what they have done, not a forecast. A going or a distance is named only where at least 100 progeny runs sit 3 or more points from the sire's own win rate. Distance bands cover Flat and jumps together.

The record

latest 50 of 142 · newest first

The latest 50 of 142 archived rides, newest first. The full record runs from 28 August 2014 to 14 June 2026.

DateCourseHorseRaceFinishSP
14 Jun 26 Downpatrick Freeway (IRE)T: S Michael Millar Irish Stallion Farms EBF Mares (Pro/Am) Flat Race18f · Good · 8 ran 6th 80/1
19 Mar 26 Cork Mollys Star (IRE)T: P E Collins William Hill Each Way Extra Challenge Series Mares (Ladies Pro/Am) Flat Race16f · Yielding · 13 ran 6th 33/1
29 Nov 25 Fairyhouse Loughdoo (IRE)T: S Michael Millar Willie Elliott Memorial (Pro/Am) Flat Race16f · Yielding To Soft · 11 ran PU 100/1
22 Nov 25 Punchestown Arctic Craft (IRE)T: S Michael Millar Exhibit A Displays (Pro/Am) Flat Race16.5f · Soft To Heavy · 8 ran 7th 66/1
19 Nov 25 Dundalk (AW) Carnival Spirit (IRE)T: S Michael Millar Irishinjuredjockeys.com Nursery Handicap (0-60)7f · Standard · 14 ran 13th 40/1
01 Nov 25 Down Royal Paymelater (IRE)T: S Michael Millar Eventsec (Pro/Am) Flat Race17f · Yielding · 6 ran 4th 33/1
09 Oct 25 Tramore Paymelater (IRE)T: S Michael Millar Copper Coast (Ladies Pro/Am) Flat Race16f · Yielding · 8 ran 6th 18/1
29 Sep 25 Down Royal Carnival Spirit (IRE)T: S Michael Millar Molson Coors Beverage Company Nursery Handicap5f · Yielding · 12 ran 12th 100/1
27 Aug 25 Bellewstown Paymelater (IRE)T: S Michael Millar Tote.ie (Ladies Pro/Am) Flat Race17f · Good · 11 ran 4th 12/1
26 Aug 25 Bellewstown Carnival Spirit (IRE)T: S Michael Millar Irish EBF Auction Series Maiden5f · Good · 13 ran 12th 400/1
16 Aug 25 Curragh Carnival Spirit (IRE)T: S Michael Millar Irish European Breeders Fund Median Sires Series Maiden6f · Good · 19 ran 17th 300/1
07 Aug 25 Sligo Loughdoo (IRE)T: S Michael Millar Irish Stallion Farms EBF Mares (Pro/Am) Flat Race18.5f · Good · 9 ran 4th 25/1
05 Jul 25 Naas Carnival Spirit (IRE)T: S Michael Millar EMS Copiers Irish EBF Fillies Maiden5f · Good · 15 ran 13th 300/1
22 Apr 25 Fairyhouse Don't Talk (GER)T: Karl Thornton Fairyhouse Racecourse Ladies National Handicap Chase21f · Soft · 12 ran UR 12/1
21 Feb 25 Dundalk (AW) Glen Princess (IRE)T: Keith Henry Clarke SIS, Supporting Irish Racing Handicap8f · Standard · 11 ran 10th 100/1
17 Jan 25 Dundalk (AW) Jerandme (IRE)T: Kevin Prendergast Irishinjuredjockeys.com Rated Race16f · Standard · 6 ran 2nd 14/1
12 Oct 24 Fairyhouse Arctic Craft (IRE)T: S Michael Millar Morgan Fuels Supporting Louth GAA (Ladies Pro/Am) Flat Race16f · Good · 7 ran 1st 6/1
29 Aug 24 Navan Breagagh (IRE)T: S Michael Millar Racing Next At Navan On Saturday September 7th Handicap (47-65)14f · Good · 22 ran 17th 40/1
28 Aug 24 Bellewstown Arctic Craft (IRE)T: S Michael Millar Jim And Niall MacMahon Memorial (Ladies Pro/Am) Flat Race17f · Good · 12 ran 7th 66/1
17 Aug 24 Perth Robin De Roost (IRE)T: Thomas Gibney Every Race Live On Racing TV Handicap ChaseClass 5 · 24f · Good · 12 ran 8th 25/1

Drawn from the whole archive (2005 onwards), so it can include runs outside the window the header statistics cover. Non-runners are not listed. A finish shown in letters is a non-completion (F fell · UR unseated · PU pulled up · BD brought down).

Quick answers

What is Aileen O'Sullivan's strike rate?
Aileen O'Sullivan has won 2 of 79 rides since 2022, a strike rate of 2.5% (as at 3 November 2026). Figures are computed from our own results archive.
Which yard does Aileen O'Sullivan ride most for?
S Michael Millar, with 65 rides since 2022 — 82% of the total. That pairing has won 1 (1.5%).
What is Aileen O'Sullivan's Fair A/E?
1.06, from 79 rides with a computed fair probability since 2022. Fair A/E compares actual wins with a margin-stripped market expectation, so 1.00 is par: above it the wins came at bigger prices than the margin-free market implied, below it they did not.
Fair A/E compares wins with a margin-stripped market expectation. Favourite-heavy samples — top yards, leading riders — naturally read a few points warm, so 1.05 means "beat the margin-free market read", not "the market underrates this by 5%". Three sample sizes are reported and never blended: runs (n), the ROI basis (n at SP), and the fair-A/E basis (n with a computed fair probability).

Strike rate is wins over all runs (n). ROI is £1 level stakes at SP over runs with a parseable price (n at SP). Fair A/E is wins over margin-stripped market expectation, over runs with a computed fair probability (n fair). The three Ns can legitimately differ and are always shown. Figures as at 3 November 2026, computed from our own results archive (2005 onwards; aggregates from 2008).