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Jockey profile

Miss S O'Brien

141 rides in the lifetime window · 61 individual horses
As at 6 Nov 2026 · KTB archive: 2005–present, updated daily
Last ride May 2017
Last 5 seasons Lifetime (2011→)
No rides in the last 5 seasons — showing the lifetime record, from 1 Jan 2008 — the aggregate floor: every horse in the window has a complete captured career behind it.
30–141
Wins / Runs
21.3%
Strike rate
n=141
66 (47%)
Placed
1.14
Fair A/E
n=141 · 0.92 incl. margin
−33.66
£1 level stake
n=141 at SP · −23.9%
£304k
Prize money (window)
Strike by season
12.5%
KTB Rider Profile

Rode around 20 times a season, across both codes, winning on 21% of them — beating the margin-free market read across the lifetime window (Fair A/E 1.14). Rode mostly for A P O'Brien — 75% of rides in the window.

Deterministic profile computed from 141 archived runs (lifetime window) · updated 6 Nov 2026
KTB at a glance 47.2% when favourite A P O'Brien: 24.5% from 106 Claiming: 22.1% Rode the favourite in 26% of races
The read

Rides in big fields of 14 or more have been a poor signal at 12.2% (n=49, Fair A/E 1.04). A P O'Brien supplied 75% of the rides and edges the rider's average (24.5% vs 21.3%, A/E 1.22) — the partnership beats the margin-free market read. The rider also read well on Good going (29.8%, n=47) and in NH Flat races (27%, n=74). The record read poorly in Flat races — 14.9% over 67 rides, 6.4pts below the baseline.

Written from the figures on this page — every claim carries its sample. Descriptive, not a tip.

Riding patterns

the angles behind the record · vs 21.3% baseline
First ride on the horse · first captured pairing
13.1%−8.2
n=61 · A/E 0.81 · £1 −22.14
Last-time-out winners · previous run was a win
40%+18.7
n=25 · A/E 1.31 · £1 +0.55
Fresh horses · 61+ days off
23.8%+2.5
n=21 · A/E 1.40 · £1 +1.46
When favourite
47.2%
n=36 · A/E 1.29 · £1 +2.02
Claiming rides · riding with a claim
22.1%+0.8
n=136 · A/E 1.16 · £1 −28.66
Big fields · 14+ runners
12.2%−9.1
n=49 · A/E 1.04 · £1 −17.00
Group / Graded races · pattern & listed
0%−21.3
n=3 · A/E 0.00 · £1 −3.00

Each tile is the record in that situation vs the 21.3% 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
On first rides for the horse 13.1% vs 21.3% · n=61
On Good going 29.8% vs 21.3% · n=47
In Flat races 14.9% vs 21.3% · n=67
In NH Flat races 27% vs 21.3% · n=74
On Soft going 15.6% vs 21.3% · n=45
Over 2m1f – 2m4f 25.7% vs 21.3% · n=35
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
NH Flat 74 20 27% −8.45
Flat 67 10 14.9% −25.21

Going

GoingRWSR£1
Good 47 14 29.8% −0.86
Soft 45 7 15.6% −23.35
Heavy 19 0 0% −19.00
Good to Soft 17 5 29.4% −4.45
Good to Firm 10 3 30% +11.00
Standard (AW) 3 1 33.3% +3.00

Courses

CourseRWSR£1
Galway 17 2 11.8% −10.25
Killarney 16 2 12.5% −10.68
Leopardstown 14 2 14.3% −10.09
Curragh 11 1 9.1% −2.00
Punchestown 10 1 10% −1.00
Tipperary 9 5 55.6% +6.75
Cork 9 3 33.3% +0.57
Limerick 9 3 33.3% +2.80
Fairyhouse 9 0 0% −9.00
Listowel 7 2 28.6% +0.38
Roscommon 6 2 33.3% +1.25
Bellewstown 5 2 40% −0.75
Down Royal 3 0 0% −3.00
Ballinrobe 3 2 66.7% +2.24
Wexford 3 1 33.3% +0.50

Class

ClassRWSR£1
Class 1 3 0 0% −3.00
Class 3 2 0 0% −2.00

Market position

In the bettingRWSRA/E£1
Favourite 37 17 45.9% 1.26 +1.02
2nd–3rd fav 58 10 17.2% 1.01 −16.68
4th–6th fav 33 3 9.1% 1.22 −5.00
7th+ in betting 13 0 0% 0.00 −13.00
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
Marchese Marconi (IRE) 13 2 7 26 Oct 14
Draco (GB) 8 0 5 19 Jun 14
Cornelius Sulla (IRE) 6 1 4 14 May 17
Kalopsia (IRE) 6 2 4 22 Nov 15
Egyptian Warrior (IRE) 6 0 2 29 Jun 14
King Leon (IRE) 6 0 3 19 May 14
Tesseract (IRE) 5 3 4 19 Jul 15
Macbride (IRE) 5 3 4 20 Jul 14
Indrik (IRE) 4 0 2 31 Jan 17
Lieutenant (IRE) 4 1 2 15 Nov 15
Rosshaven Lady (IRE) 4 2 2 9 Sep 15
Angel Chorus (IRE) 4 1 3 21 Sep 13
Showing the 60 most-raced of the 61 horses ridden in this window — each ran at least 1 time. Horses with fewer runs aren't listed; search finds any horse since 2005. 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, lifetime
JFMAMJJASOND
17208027582428172500
Muted months are small samples (under 30 runs) — read them with the caution they deserve.

Riding for

same window · biggest samples first
Main yardA P O'Brien
75% of all rides
24.5% SR · A/E 1.22
TrainerRWSR£1
A P O'Brien 106 26 24.5% −20.79
Muted rows are under 30 rides and sit behind "Show all".

Career highlights

lifetime archive, 2011→
30
Archived wins
£304k
Prize money
2015
Best season · 15 wins
Beach Of Falesa (IRE) — Boylesports.com Ladies Derby Handicap Curragh · Jun 2013
£9,315
Tesseract (IRE) — Jim Ryan Racecourse Services Flat Race Tipperary · Jul 2015
£8,970
Marchese Marconi (IRE) — Derek Ryan 24th July (Q.R.) Race Limerick · Jun 2014
£8,970
Notable horses
Tesseract (IRE) Macbride (IRE) Marchese Marconi (IRE) Kalopsia (IRE) Rosshaven Lady (IRE) Oathkeeper (IRE)

Sires of the horses ridden

progeny record · win % by ground and trip
Galileo (IRE) 17.1% · 6–35
Progeny have won 14.5% of 18,201 runs since 2008 (1,776 horses). Strongest over 6f – 7f (all codes): 18.2% from 1,383. Weakest over 2m5f – 3m (all codes): 9.4% from 890.
Oscar (IRE) 50% · 5–10
Progeny have won 10.9% of 16,543 runs since 2008 (1,456 horses). Strongest on Standard (AW) going: 18.1% from 105.
Hernando (FR) 0% · 0–8
Progeny have won 12.1% of 3,531 runs since 2008 (273 horses). Weakest over 6f – 7f (all codes): 7.5% from 120.
Dylan Thomas (IRE) 50% · 3–6
Progeny have won 10.5% of 7,493 runs since 2011 (533 horses). Strongest at trips under 6f (all codes): 17.7% from 192.
Flemensfirth (USA) 33.3% · 2–6
Progeny have won 11.9% of 17,288 runs since 2008 (1,595 horses).
Mountain High (IRE) 0% · 0–6
Progeny have won 9.5% of 2,245 runs since 2011 (184 horses).
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 6 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 141 · newest first

The latest 50 of 141 archived rides, newest first. The full record runs from 17 July 2011 to 15 May 2017.

DateCourseHorseRaceFinishSP
15 May 17 Killarney Oath Breaker (IRE)T: Joseph Patrick O'Brien Killarney Racegoers Club (ladies Pro/am) Flat Race17f · Soft · 12 ran 10th 12/1
14 May 17 Killarney Cornelius Sulla (IRE)T: Joseph Patrick O'Brien Jim Ryan Racecourse Services (pro/am) Flat Race17f · Good · 16 ran 1st 11/4F
01 May 17 Down Royal Cornelius Sulla (IRE)T: Joseph Patrick O'Brien Bet With The Tote Flat Race16f · Good · 17 ran 2nd 6/4F
25 Apr 17 Punchestown Cornelius Sulla (IRE)T: Joseph Patrick O'Brien Dooley Insurances Flat Race16f · Good To Yielding · 23 ran 3rd 7/1
18 Apr 17 Fairyhouse Oath Breaker (IRE)T: Joseph Patrick O'Brien Auld Stand Ratoath & Kelly Pub Ashbourne Supporting Meath GAA Race Day Flat Race16f · Good To Yielding · 11 ran 5th 20/1
16 Apr 17 Cork Karkadann (IRE)T: Joseph Patrick O'Brien Corkracecourse.ie (pro/am) Flat Race19f · Good · 13 ran 7th 25/1
06 Apr 17 Limerick Cornelius Sulla (IRE)T: Joseph Patrick O'Brien Kevin Mcmanus Bookmaker Champion (pro/am) Flat Race (listed)16f · Soft · 10 ran 2nd 12/1
18 Mar 17 Limerick Cornelius Sulla (IRE)T: Joseph Patrick O'Brien Book Online 19 Punter Pack (pro/am) Flat Race16f · Soft · 13 ran 9th 7/1
05 Mar 17 Leopardstown Cornelius Sulla (IRE)T: Joseph Patrick O'Brien Trm Excellence In Equine Nutrition (pro/am) Flat Race16f · Heavy · 6 ran 3rd 11/4
03 Mar 17 Dundalk (AW) Tommy Welsh (IRE)T: Joseph Patrick O'Brien Race & Dine From 25 p.p. (Q.R.) Handicap16f · Standard · 14 ran 1st 5/1
12 Feb 17 Leopardstown Imperial Way (IRE)T: Joseph Patrick O'Brien Leopardstown Club Membership (Pro/Am) Flat Race16f · Soft · 8 ran 3rd 10/1
11 Feb 17 Naas West Coast Time (IRE)T: Joseph Patrick O'Brien Cavan Developments Home Builder Supporting Kill GAA (Pro/Am) Flat Race19f · Soft · 4 ran 2nd 9/4
31 Jan 17 Down Royal Indrik (IRE)T: Joseph Patrick O'Brien Dark Horse Wine Bar At Down Royal Flat Race16f · Soft To Heavy · 9 ran 4th 7/2
29 Jan 17 Leopardstown Le Richebourg (FR)T: Joseph Patrick O'Brien Leopardstown Club Membership (Pro/Am) Flat Race16f · Good · 9 ran 2nd 13/8J
22 Jan 17 Leopardstown Imperial Way (IRE)T: Joseph Patrick O'Brien 'join The Coral Bet & Get Club At Coral.ie' (pro/am) Flat Race16f · Good · 9 ran 2nd 11/4
15 Jan 17 Fairyhouse Indrik (IRE)T: Joseph Patrick O'Brien Next Racing At Fairyhouse January 25th (Pro/Am) Flat Race16f · Soft · 11 ran 3rd 9/1
11 Oct 16 Galway Let's Twist Again (IRE)T: Joseph Patrick O'Brien Jamie Kyne Memorial Flat Race16.5f · Good · 18 ran 4th 5/1
04 Oct 16 Tipperary Indrik (IRE)T: Joseph Patrick O'Brien Season Finale Flat Race20f · Yielding To Soft · 14 ran 2nd 10/1
25 Sep 16 Curragh Udogo (GB)T: Joseph Patrick O'Brien Manguard Plus Amateur Riders Derby (Q.R.) Handicap (50-85)12f · Heavy · 20 ran 15th 11/1
14 Sep 16 Listowel Fortuna Iuvat (IRE)T: Joseph Patrick O'Brien Listowel Vintners Association Flat Race20f · Heavy · 8 ran 4th 8/1

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 Miss S O'Brien's strike rate?
Miss S O'Brien has won 30 of 141 rides since 2008, a strike rate of 21.3% (as at 6 November 2026). Figures are computed from our own results archive.
Which yard does Miss S O'Brien ride most for?
A P O'Brien, with 106 rides since 2008 — 75% of the total. That pairing has won 26 (24.5%).
What is Miss S O'Brien's Fair A/E?
1.14, from 141 rides with a computed fair probability since 2008. 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 6 November 2026, computed from our own results archive (2005 onwards; aggregates from 2008).