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Trainer profile

Jennifer Mason

212 runners in the lifetime window · 41 individual horses
As at 9 Nov 2026 · KTB archive: 2005–present, updated daily
Last runner May 2022 100% of runners over jumps
Last 5 seasons Lifetime (2011→)
from 1 Jan 2008 — the aggregate floor: every horse in the window has a complete captured career behind it
10–212
Wins / Runs
4.7%
Strike rate
n=212
34 (16%)
Placed
0.70
Fair A/E
n=212 · 0.61 incl. margin
+4.00
£1 level stake
n=212 at SP · +1.9%
£72,531
Prize money (window)
Strike by season
0%
KTB Yard Profile

Sends out around 10 runners a season, almost all over hurdles and fences, winning with 5% of them — a touch below the margin-free market read across the lifetime window (Fair A/E 0.70).

Deterministic profile computed from 212 archived runs (lifetime window) · updated 9 Nov 2026
The read

The yard also reads well beyond 3m (8.8%, n=34). The record reads poorly over 1m5f – 2m — 0% over 44 runners, 4.7pts below the baseline.

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

Yard patterns

the angles behind the record · vs 4.7% baseline
Fresh · 61+ days off
4.7%+0.0
n=64 · A/E 0.86 · £1 −38.50
New recruits · first run for the yard
7.4%+2.7
n=27 · A/E 1.43 · £1 −7.00
Debutants · first career start
0%−4.7
n=15 · A/E 0.00 · £1 −15.00
First-time headgear · true-first definition
5.9%+1.2
n=17 · A/E 1.79 · £1 +24.00
Headgear returns · back on after a bare run
0%−4.7
n=4 · A/E 0.00 · £1 −4.00
When favourite
12.5%
n=8 · A/E 0.52 · £1 −5.50
Claiming riders · a claimer in the saddle
3.9%−0.8
n=76 · A/E 0.55 · £1 −19.50
Group / Graded races · pattern & listed
0%−4.7
n=1 · A/E 0.00 · £1 −1.00

Each tile is the record in that situation vs the 4.7% baseline — descriptive splits with the sample always shown, for you to weigh. Tiles under 30 runs render muted. Headgear figures use the true-first definition (first gear appearance in the captured career); returns are gear back on after a bare run. Claiming riders are runs where the booked rider carried a weight claim. Group / Graded covers pattern and listed races. The same beliefs, tested across every yard and every GB and Irish race since 2005: Racing myths.

Notable angles

vs their own baseline
Over 1m5f – 2m 0% vs 4.7% · n=44
Beyond 3m 8.8% vs 4.7% · n=34
In Class 5 7.2% vs 4.7% · n=83
Off a 31-60-day break 2.1% vs 4.7% · n=48
In Chase races 6.7% vs 4.7% · n=89
With a new jockey booking 6.4% vs 4.7% · n=110 · A/E 1.19
This filter uses derived form angles computed for 59.7% of the archive so far (as at 9 Nov 2026); the sample will grow as sequencing completes.
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
Hurdle 100 4 4% +24.00
Chase 89 6 6.7% +3.00
NH Flat 23 0 0% −23.00

Going

GoingRWSR£1
Good 73 4 5.5% −9.00
Soft 54 3 5.6% +64.50
Good to Soft 52 2 3.8% −39.50
Heavy 20 0 0% −20.00
Good to Firm 12 1 8.3% +9.00
Firm 1 0 0% −1.00

Courses

CourseRWSR£1
Wincanton 26 1 3.8% −5.00
Hereford 15 2 13.3% +13.00
Stratford 14 0 0% −14.00
Taunton 14 1 7.1% −11.00
Warwick 14 0 0% −14.00
Worcester 12 0 0% −12.00
Southwell 11 0 0% −11.00
Fontwell 10 1 10% −7.50
Ludlow 10 1 10% +91.00
Chepstow 9 0 0% −9.00
Uttoxeter 8 0 0% −8.00
Exeter 8 1 12.5% +33.00
Newton Abbot 8 1 12.5% −1.00
Huntingdon 7 0 0% −7.00
Market Rasen 7 0 0% −7.00

Class

ClassRWSR£1
Class 4 98 4 4.1% +34.00
Class 5 83 6 7.2% +1.00
Class 6 17 0 0% −17.00
Class 3 12 0 0% −12.00
Class 1 2 0 0% −2.00

Market position

In the bettingRWSRA/E£1
Favourite 10 1 10% 0.45 −7.50
2nd–3rd fav 29 3 10.3% 0.63 −7.50
4th–6th fav 62 3 4.8% 0.68 −33.00
7th+ in betting 111 3 2.7% 1.04 +52.00
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.

Jumping record

completion over obstacles · same window as header
80.4% completed · 189 obstacle runners (chases & hurdles)
CodeRCompFURPUBDOth
Chase 89 77.5% 3 4 13 0 0
Hurdle 100 83% 1 0 16 0 0
Chases and hurdles only — bumpers have no obstacles, so completion is not a question there. F fell · UR unseated rider · PU pulled up · BD brought down · Oth covers refusals, slip-ups, run-outs and the rare disqualification. Non-runners are excluded throughout. Rows under n=30 are shown faded. A descriptive record, not a tip.

Horses trained

same window as header · most-raced first
HorseRWPlLast ran
Call Me Sid (GB) 14 1 5 6 Mar 20
Legends Lass (GB)from Martin Keighley 14 1 3 25 Sep 12
Frilly Frock (IRE) 13 1 1 13 Sep 21
Shy John (GB)from P W Mason 13 1 2 2 Feb 17
Love of Tara (GB)from Martin Keighley 12 1 2 9 Feb 13
Bonanza Sam (GB)then Chris Gordon 11 1 2 2 Dec 21
Oskar Denarius (IRE)from Marcus Tregoning · then Ben Pauling 10 2 2 26 Dec 17
Catcharose (IRE) 10 0 0 23 Jul 15
Wick Green (GB)from Charlie Longsdon · then Ben Pauling 8 1 1 8 May 22
Pretty Penny (GB)from Martin Keighley 8 1 3 21 Apr 13
Madam Deluxe (GB)from Nicky Henderson 7 0 0 28 Oct 21
You Too Pet (IRE)from P W Mason · then D Peters 6 0 3 11 Apr 17
All 41 horses sent out 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.
Where they came from · where they went next

Of the 41 horses listed, 26 arrived from another yard in our archive, most often from Martin Keighley (5) and Charlie Longsdon (2); 15 had their first archived run for this yard.

10 have since run for another yard, most often for Ben Pauling (3); 31 have no later run for another yard in our archive.

Read from each listed horse's whole archived career (2005 onwards), not only this window, and counted over the horses listed above, not the whole string. “First archived run” means our archive holds nothing earlier, not that the horse was unraced. A horse with no later run elsewhere may still be here, be off the track, or have run somewhere our archive does not cover — none of that is asserted.

When the yard fires

strike by month, lifetime
JFMAMJJASOND
13060070001168
A jumps yard: the season runs Oct–Apr. Muted months are small samples (under 30 runs) — read them with the caution they deserve.

Jockey bookings

same window · biggest samples first
Go-to riderFelix De Giles
14% of all rides
6.7% SR · A/E 0.89
RiderRWSR£1
Felix De Giles 30 2 6.7% −16.00
Muted rows are under 30 rides and sit behind "Show all".

Career highlights

lifetime archive, 2011→
10
Archived wins
£72,531
Prize money
2021
Best season · 2 wins
Call Me Sid (GB) — Jubilee Restaurant Maiden Hurdle Ludlow · Jan 2018 · Class 4
£4,809
Shy John (GB) — C&s Electrical Wholesale Handicap Chase Taunton · Mar 2015 · Class 4
£4,327
Wick Green (GB) — Download The Star Sports App Now Handicap Chase Hereford · Nov 2021 · Class 4
£3,594
Notable horses
Oskar Denarius (IRE) Call Me Sid (GB) Legends Lass (GB) Frilly Frock (IRE) Shy John (GB) Love of Tara (GB)

Sires in the string

progeny record · win % by ground and trip
Kayf Tara (GB) 4.3% · 1–23
Progeny have won 12.6% of 13,762 runs since 2008 (1,148 horses). Strongest on Heavy going: 16.2% from 1,708.
Midnight Legend (GB) 5% · 1–20
Progeny have won 14.2% of 8,311 runs since 2008 (494 horses).
Black Sam Bellamy (IRE) 7.1% · 1–14
Progeny have won 10.3% of 4,688 runs since 2008 (466 horses). Weakest over 1m2f – 1m4f (all codes): 5.5% from 145.
Schiaparelli (GER) 7.1% · 1–14
Progeny have won 12.1% of 1,841 runs since 2015 (203 horses).
Kier Park (IRE) 7.7% · 1–13
Progeny have won 11.1% of 287 runs since 2008 (20 horses).
Mahler (GB) 7.7% · 1–13
Progeny have won 10.8% of 8,890 runs since 2014 (790 horses). Strongest on Good to Firm going: 15.1% from 119.
Top line: the yard'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 9 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 212 · newest first

The latest 50 of 212 archived runners, newest first. The full record runs from 3 March 2011 to 8 May 2022.

DateCourseHorseRaceFinishSP
08 May 22 Plumpton Wick Green (GB)J: Mr Peter Mason Steve Brewer Belated 50th Birthday Celebration Handicap ChaseClass 5 · 25.5f · Good · 7 ran PU 9/1
05 Apr 22 Exeter Wick Green (GB)J: Mr Peter Mason Every Race Live On Racing Tv Handicap ChaseClass 5 · 24f · Good · 7 ran 4th 11/2
22 Feb 22 Taunton Wick Green (GB)J: Nick Scholfield Weatherbys Nhstallions.co.uk Handicap ChaseClass 4 · 23f · Good To Soft · 9 ran 7th 25/1
19 Dec 21 Fakenham Wick Green (GB)J: Mr Peter Mason Christmas Cracker Stayers' Handicap ChaseClass 4 · 29f · Good To Soft · 6 ran 4th 12/1
02 Dec 21 Wincanton Bonanza Sam (GB)J: Mr Peter Mason Thorners Handicap ChaseClass 5 · 26.5f · Good · 8 ran PU 28/1
24 Nov 21 Hereford Wick Green (GB)J: Mr Peter Mason Download The Star Sports App Now Handicap ChaseClass 4 · 25f · Good · 4 ran 1st 12/1
28 Oct 21 Stratford Madam Deluxe (GB)J: James Davies J.H. Rowe Memorial Handicap ChaseClass 4 · 22.5f · Good · 10 ran 4th 22/1
01 Oct 21 Fontwell Bonanza Sam (GB)J: Alexander Thorne Follow At The Races On Twitter Conditional Jockeys' Handicap ChaseClass 4 · 26f · Good To Soft · 5 ran 3rd 8/1
29 Sep 21 Bangor-on-Dee Madam Deluxe (GB)J: Alexander Thorne tote+ At tote.co.uk Conditional Jockeys' Handicap ChaseClass 4 · 20.5f · Good · 9 ran 6th 22/1
13 Sep 21 Worcester Frilly Frock (IRE)J: Tabitha Worsley MansionBet Bet 10 Get 20 Conditional Jockeys' Handicap Chase (Div 1)Class 5 · 23f · Good · 10 ran 8th 66/1
19 Aug 21 Stratford Frilly Frock (IRE)J: Alexander Thorne National Racehorse Week 12th - 19th September Handicap ChaseClass 5 · 27.5f · Good · 8 ran 6th 12/1
29 Jul 21 Stratford Frilly Frock (IRE)J: Nick Scholfield Erin, Anya And Joe Brewer Handicap ChaseClass 5 · 22.5f · Good · 16 ran PU 28/1
31 May 21 Huntingdon Frilly Frock (IRE)J: Alexander Thorne Thank You Boongate Kia Mares' Handicap ChaseClass 5 · 23.5f · Good To Firm · 10 ran 6th 7/1
06 May 21 Worcester Full Trottle (IRE)J: Alexander Thorne Let's Talk Handicap ChaseClass 4 · 20f · Good · 14 ran PU 33/1
03 May 21 Warwick Madam Deluxe (GB)J: Nick Scholfield racingtv.com Mares' Handicap HurdleClass 4 · 21f · Soft · 7 ran 4th 40/1
19 Apr 21 Kempton Full Trottle (IRE)J: Alexander Thorne Get Great Odds At VBET Handicap ChaseClass 4 · 20.5f · Good · 6 ran 2nd 12/1
12 Apr 21 Huntingdon Frilly Frock (IRE)J: Alexander Thorne Racing TV Handicap ChaseClass 5 · 23.5f · Good · 9 ran 4th 22/1
09 Apr 21 Sedgefield Bonanza Sam (GB)J: Alexander Thorne Vickers.bet Follow Facebook For Latest Offer Handicap ChaseClass 5 · 26.5f · Good · 9 ran 6th 5/1
29 Mar 21 Wincanton Madam Deluxe (GB)J: Mr Peter Mason Visit Racingtv.com Amateur Jockeys' Handicap HurdleClass 4 · 21.5f · Good · 15 ran PU 33/1
28 Mar 21 Ascot Teeton Surprise (GB)J: Alexander Thorne Peter O'Sullevan Lambourn Virtual Open Day Open Hunters' ChaseClass 5 · 24f · Good · 5 ran PU 12/1

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 Jennifer Mason's strike rate?
Jennifer Mason has won 10 of 212 runners since 2008, a strike rate of 4.7% (as at 9 November 2026). Figures are computed from our own results archive.
What is Jennifer Mason's Fair A/E?
0.70, from 212 runners 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 9 November 2026, computed from our own results archive (2005 onwards; aggregates from 2008).