Skip to content
Jockey profile

Jemma Marshall

567 rides in the lifetime window · 221 individual horses
As at 6 Nov 2026 · KTB archive: 2005–present, updated daily
Last ride Oct 2014 100% of rides on the flat
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.
28–567
Wins / Runs
4.9%
Strike rate
n=567
91 (16%)
Placed
0.82
n=560 · 0.69 incl. margin
−235.36
£1 level stake
n=567 at SP · −41.5%
£121k
Prize money (window)
Strike by season
0%
KTB Rider Profile

Rode around 80 times a season, almost all on the flat, winning on 5% of them — a touch below the margin-free market read across the lifetime window (Fair A/E 0.82). Riding last-time-out winners the record reads 13% (32 rides). Rode mostly for Pat Phelan — 45% of rides in the window.

Deterministic profile computed from 567 archived runs (lifetime window) · updated 6 Nov 2026
KTB at a glance Fired Feb–Apr Fresh horses: 6.5% Pat Phelan: 5.5% from 255 First rides: 6.1% LTO winners: 12.5%
The read

The record is strongest at Brighton (14.6%, n=41), clear of the rider's 4.9% baseline. It is weakest at Windsor (0% over 30 rides) — the widest gap in the record. Rides on last-time-out winners have been a positive signal at 12.5% (n=32, Fair A/E 0.96). The market has consistently overbet claiming rides: 4.9% strike, Fair A/E 0.83 and −232.86 to a £1 stake over 534 rides — those runners underperformed what the price implied. Pat Phelan supplied 45% of the rides and matches the rider's average almost exactly (5.5%, A/E 0.93). The rider also read well over 1m5f – 2m (10%, n=40). The record read poorly at trips under 6f — 0% over 34 rides, 4.9pts below the baseline. Seasonally, the rider fired Feb–Apr.

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

Riding patterns

the angles behind the record · vs 4.9% baseline
First ride on the horse · first captured pairing
6.1%+1.2
n=214 · A/E 1.12 · £1 −70.71
Last-time-out winners · previous run was a win
12.5%+7.6
n=32 · A/E 0.96 · £1 −18.40
Fresh horses · 61+ days off
6.5%+1.6
n=93 · A/E 1.30 · £1 +3.25
When favourite
33.3%
n=15 · A/E 1.02 · £1 −3.36
Claiming rides · riding with a claim
4.9%+0.0
n=534 · A/E 0.83 · £1 −232.86
Big fields · 14+ runners
4.1%−0.8
n=73 · A/E 0.94 · £1 −14.00
Group / Graded races · pattern & listed
0%−4.9
n=1 · A/E 0.00 · £1 −1.00

Each tile is the record in that situation vs the 4.9% 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
With Gary Moore 17% vs 4.9% · n=53
At Brighton 14.6% vs 4.9% · n=41
On last-time-out winners 12.5% vs 4.9% · n=32
Over 1m5f – 2m 10% vs 4.9% · n=40
At trips under 6f 0% vs 4.9% · n=34
At Windsor 0% vs 4.9% · n=30
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 565 28 5% −233.36
Hurdle 1 0 0% −1.00
NH Flat 1 0 0% −1.00

Going

GoingRWSR£1
Standard (AW) 342 17 5% −188.46
Good to Firm 85 4 4.7% +29.00
Good 62 2 3.2% −50.50
Soft 32 1 3.1% −6.00
Good to Soft 31 3 9.7% −6.50
Firm 12 1 8.3% −9.90
Heavy 3 0 0% −3.00

Courses

CourseRWSR£1
Lingfield 145 8 5.5% −85.71
Kempton (AW) 139 7 5% −52.25
Wolverhampton (AW) 41 2 4.9% −33.50
Brighton 41 6 14.6% +22.60
Epsom Downs 30 1 3.3% +21.00
Windsor 30 0 0% −30.00
Lingfield 15 1 6.7% −10.50
Goodwood 15 0 0% −15.00
Southwell (AW) 12 0 0% −12.00
Bath 12 0 0% −12.00
Newbury 10 0 0% −10.00
Salisbury 9 1 11.1% −2.00
Sandown 9 0 0% −9.00
Yarmouth 7 0 0% −7.00
Redcar 7 0 0% −7.00

Class

ClassRWSR£1
Class 6 263 16 6.1% −123.96
Class 5 218 7 3.2% −141.40
Class 4 65 5 7.7% +51.00
Class 7 12 0 0% −12.00
Class 3 6 0 0% −6.00
Class 2 2 0 0% −2.00
Class 1 1 0 0% −1.00

Market position

In the bettingRWSRA/E£1
Favourite 19 6 31.6% 1.06 −3.36
2nd–3rd fav 53 7 13.2% 1.00 −14.00
4th–6th fav 166 7 4.2% 0.62 −91.00
7th+ in betting 329 8 2.4% 0.79 −127.00
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
Beat Route (GB) 26 2 7 29 Nov 11
Young Dottie (GB) 15 3 5 23 Oct 14
Silly Billy (IRE) 14 0 1 20 Dec 12
Epsom Salts (GB) 13 1 2 25 Jul 14
Green Earth (IRE) 13 2 3 14 Jul 14
Ermyn Flyer (GB) 12 1 3 20 Dec 12
Baby Dottie (GB) 11 0 3 23 Nov 13
Super Duplex (GB) 11 0 1 22 Oct 13
Ermyntrude (GB) 11 2 3 2 Jul 13
The Wonga Coup (IRE) 10 0 2 22 Jul 13
Many Welcomes (GB) 10 1 6 28 Jul 10
Charleys Angel (GB) 8 0 0 31 Mar 14
Showing the 60 most-raced of the 221 horses ridden in this window — each ran at least 3 times. 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
288745170569
A flat rider: the season runs Mar–Oct. Muted months are small samples (under 30 runs) — read them with the caution they deserve.

Riding for

same window · biggest samples first
Main yardPat Phelan
45% of all rides
5.5% SR · A/E 0.93
TrainerRWSR£1
Pat Phelan 255 14 5.5% −68.65
Michael Attwater 72 2 2.8% −46.00
Gary Moore 53 9 17% +3.29
Brian Baugh 31 1 3.2% −5.00
Muted rows are under 30 rides and sit behind "Show all".

Career highlights

lifetime archive, 2005→
33
Archived wins
£145k
Prize money
2008
Best season · 9 wins
In our archive from its very first year (2005), so this career almost certainly began earlier than our record does. The figures above count 2005 onwards only — what the archive holds, not a full-career total. This card is the full archive census (2005→); the statistics in the header aggregate from 2008 — the floor that guarantees every horse a complete captured career — so this card can legitimately show more wins than the header.
Young Dottie (GB) — Ladbrokes Safety Net Bet E.B.F. Fillies' Handicap Lingfield (AW) · Nov 2010 · Class 4
£5,828
Young Dottie (GB) — British Stallion Studs Supporting British Racing E.B.F. Fillies' Handicap Lingfield (AW) · Nov 2011 · Class 4
£5,822
Shimoni (GB) — Weatherbys Bank Apprentice Handicap Kempton (AW) · Aug 2008 · Class 4
£4,727

Sires of the horses ridden

progeny record · win % by ground and trip
Beat Hollow (GB) 7.7% · 2–26
Progeny have won 11.3% of 6,034 runs since 2008 (412 horses).
Cape Cross (IRE) 9.5% · 2–21
Progeny have won 13.3% of 12,754 runs since 2008 (988 horses). Weakest on Heavy going: 8.4% from 477. Weakest over 2m5f – 3m (all codes): 7.8% from 230.
Desert Sun (GB) 18.8% · 3–16
Progeny have won 9.3% of 1,166 runs since 2008 (84 horses).
Noverre (USA) 0% · 0–16
Progeny have won 10.7% of 3,831 runs since 2008 (235 horses). Strongest on Good to Firm going: 13.7% from 803. Weakest on Soft going: 6.9% from 407.
Progeny have won 10.2% of 12,809 runs since 2009 (938 horses). Weakest over 2m1f – 2m4f (all codes): 6.9% from 320.
Josr Algarhoud (IRE) 7.1% · 1–14
Progeny have won 8.4% of 1,548 runs since 2008 (146 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 714 · newest first

The latest 50 of 714 archived rides, newest first. The full record runs from 12 January 2005 to 25 October 2014.

DateCourseHorseRaceFinishSP
10 Jul 14 Epsom Downs Isabella Beeton (GB)T: Pat Phelan Deadman Confidential HandicapClass 5 · 10f · Good To Firm · 8 ran 7th 33/1
10 Jul 14 Epsom Downs Young Dottie (GB)T: Pat Phelan Totepool Home Of Pool Betting HandicapClass 4 · 8.5f · Good To Firm · 6 ran 5th 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 Jemma Marshall's strike rate?
Jemma Marshall has won 28 of 567 rides since 2008, a strike rate of 4.9% (as at 6 November 2026). Figures are computed from our own results archive.
Which course does Jemma Marshall do best at?
Brighton by strike rate: 6 wins from 41 rides (14.6%) since 2008. Read from the 15 courses with the most rides on the same basis, and only those with at least 30 — a small sample cannot top the list, and a rarely-visited course is not in the comparison.
Which yard does Jemma Marshall ride most for?
Pat Phelan, with 255 rides since 2008 — 45% of the total. That pairing has won 14 (5.5%).
What is Jemma Marshall's Fair A/E?
0.82, from 560 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).