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Trainer profile

S Bossert

42 runners in the lifetime window · 9 individual horses
As at 4 Nov 2026 · KTB archive: 2005–present, updated daily
Last runner 12 days ago 100% of runners on the flat
Last 5 seasons Lifetime (2011→)
from 1 Jan 2008 — the aggregate floor: every horse in the window has a complete captured career behind it
2–42
Wins / Runs
4.8%
Strike rate
n=42
10 (24%)
Placed
1.24
Fair A/E
n=42 · 1.04 incl. margin
−13.20
£1 level stake
n=42 at SP · −31.4%
£37,114
Prize money (window)
Strike by season
0%

Yard patterns

the angles behind the record · vs 4.8% baseline
Fresh · 61+ days off
8.7%+3.9
n=23 · A/E 2.44 · £1 +5.80
New recruits · first run for the yard
0%−4.8
n=7 · A/E 0.00 · £1 −7.00
Debutants · first career start
0%−4.8
n=2 · A/E 0.00 · £1 −2.00
First-time headgear · true-first definition
0%−4.8
n=2 · A/E 0.00 · £1 −2.00
Headgear returns · back on after a bare run
0%−4.8
n=1 · A/E 0.00 · £1 −1.00
Claiming riders · a claimer in the saddle
0%−4.8
n=10 · A/E 0.00 · £1 −10.00

Each tile is the record in that situation vs the 4.8% 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.

Record by conditions

same window as header

Going

GoingRWSR£1
Standard (AW) 33 2 6.1% −4.20
Good 4 0 0% −4.00
Good to Soft 2 0 0% −2.00
Soft 2 0 0% −2.00
Heavy 1 0 0% −1.00

Courses

CourseRWSR£1
Deauville (FR) 27 1 3.7% −17.90
Chantilly (FR) 7 1 14.3% +12.70
Longchamp (FR) 2 0 0% −2.00
Maisons-Laffitte (FR) 2 0 0% −2.00
Saint-Cloud (FR) 2 0 0% −2.00
Nancy (FR) 1 0 0% −1.00
Lyon-La Soie (FR) 1 0 0% −1.00

Class

ClassRWSR£1
Class 4 2 0 0% −2.00

Market position

In the bettingRWSRA/E£1
4th–6th fav 6 1 16.7% 2.25 +3.10
7th+ in betting 36 1 2.8% 0.86 −16.30
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 trained

same window as header · most-raced first
HorseRWPlLast ran
Layman Junior (FR)from B Bossert 21 2 10 16 Dec 16
Allez Bailey (FR)from F Bossert 8 0 0 19 Sep 14
Venes (FR)from Mathieu Pitart 5 0 0 12 Aug 25
Force Tranquille (FR)from S Cerulis 2 0 0 23 Oct 26
Power Secretariat (FR) 2 0 0 24 Sep 21
Louisdargent (FR)from S Wattel 1 0 0 23 Dec 18
Colombe Du Moulin (FR) 1 0 0 7 Mar 17
Nid D'Abeilles (IRE)from F Bossert 1 0 0 21 Dec 11
Seba Le Roi (FR)from F Bossert 1 0 0 26 Aug 11
All 9 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 9 horses listed, 7 arrived from another yard in our archive, most often from F Bossert (3); 2 had their first archived run for this yard.

None of them has a 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.

Current form

significance-gated

Last 14 days

Small sample
0 from 1
Only 1 runners in the last 14 days — too few to read against the baseline (gate: n≥15). The card states the sample and stays neutral.

When the yard fires

strike by month, lifetime
JFMAMJJASOND
0·050·00000013
A flat yard: the season runs Mar–Oct. Muted months are small samples (under 30 runs) — read them with the caution they deserve.

Jockey bookings

same window · biggest samples first
RiderRWSR£1
Delphine Santiago 15 2 13.3% +13.80
Raphael Marchelli 5 0 0% −5.00
Mlle Zoe Pfeil 4 0 0% −4.00
Fabien Lefebvre 2 0 0% −2.00
Mlle Deborah Barnier 2 0 0% −2.00
Mme Sophie Chuette 2 0 0% −2.00
Mr Samuel Bossert 2 0 0% −2.00
Mr Thomas Stosse 1 0 0% −1.00
Michael Poirier 1 0 0% −1.00
Mme Ambre Molins 1 0 0% −1.00
Antonio Orani 1 0 0% −1.00
Rosario Mangione 1 0 0% −1.00
Muted rows are under 30 rides.

Career highlights

lifetime archive, 2011→
2
Archived wins
£37,114
Prize money
2014
Best season · 1 win
Layman Junior (FR) — Prix Des Sorbiers (Handicap) (5yo+) (Polytrack) Chantilly (FR) · Apr 2014
£8,750
Layman Junior (FR) — Prix De Saint-Sauveur Le Vicomte (Handicap) (4yo+) (Fibresand) Deauville (FR) · Dec 2013
£6,098
Notable horses
Layman Junior (FR)

Sires in the string

progeny record · win % by ground and trip
Layman (USA) 9.5% · 2–21
Progeny have won 9.3% of 1,327 runs since 2010 (122 horses). Strongest on Soft going: 13.3% from 279. Strongest over 2m1f – 2m4f (all codes): 14.9% from 161.
Orpen (USA) 0% · 0–8
Progeny have won 9% of 4,038 runs since 2008 (381 horses). Weakest over 2m5f – 3m (all codes): 4.4% from 113.
Literato (FR) 0% · 0–5
Progeny have won 7.3% of 1,062 runs since 2012 (130 horses).
Anodin (IRE) 0% · 0–2
Progeny have won 8.8% of 2,433 runs since 2018 (275 horses). Weakest over 2m1f – 2m4f (all codes): 3.4% from 116.
Mr Sidney (USA) 0% · 0–2
Progeny have won 8.2% of 574 runs since 2013 (59 horses). Strongest on Soft going: 12.6% from 103. Weakest on Standard (AW) going: 4.3% from 233. Weakest over 6f – 7f (all codes): 2.4% from 123.
Arc Royal (GER) 0% · 0–1
Progeny have won 8.1% of 37 runs since 2010 (6 horses).
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 4 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

all 42 archived runs · newest first

Every one of S Bossert's 42 archived runners, from 21 August 2011 to 23 October 2026, newest first — 2 winners among them.

DateCourseHorseRaceFinishSP
23 Oct 26 Lyon-La Soie (FR) Force Tranquille (FR)J: Mme Coralie Pacaut Prix Des Pentes De La Croix-rousseClass 4 · 16f · Standard · 9 ran 6th 14/1
11 Oct 26 Nancy (FR) Force Tranquille (FR)J: Mme Sophie Chuette Prix Du Journal "Paris Turf"Class 4 · 12.5f · Soft · 15 ran 15th 28/1
12 Aug 25 Deauville (FR) Venes (FR)J: Rosario Mangione Prix du Quai de la Quarantaine - Categorie Personnel Administratif (Handicap) (4yo+) (All-Weather Tr7.5f · Standard · 13 ran 10th 34/1
05 Jul 25 Deauville (FR) Venes (FR)J: Fabrice Veron Prix de Valognes (Handicap) (4yo+) (All-Weather Track) (Polytrack)9.5f · Standard · 16 ran 15th 81/1
22 Aug 24 Deauville (FR) Venes (FR)J: Mme Sophie Chuette Prix du Thenney (Handicap) (4yo+) (All-Weather Track) (Polytrack)9.5f · Standard · 13 ran 7th 101/1
08 Aug 24 Deauville (FR) Venes (FR)J: Antonio Orani Prix Association des Jockeys (Handicap) (4yo+) (All-Weather Track) (Polytrack)6.5f · Slow · 15 ran 15th 24/1
06 Jun 24 Longchamp (FR) Venes (FR)J: Mme Ambre Molins Prix Como Mercedes-Benz (Conditions) (4yo+) (Inner Course: 2nd Post) (Turf)8f · Good To Soft · 13 ran 9th 24/1
24 Sep 21 Chantilly (FR) Power Secretariat (FR)J: Mme Aude Duporte Prix de Crouy-en-Thelle (Handicap) (4yo+) (All-Weather Track) (Polytrack)9f · Standard · 17 ran 17th 33/1
15 Sep 20 Saint-Cloud (FR) Power Secretariat (FR)J: Fabien Lefebvre Prix de l'Etang de Saint-Cucufa (Conditions) (4yo+) (Turf)10.5f · Good · 13 ran 13th 28/1
23 Dec 18 Deauville (FR) Louisdargent (FR)J: Mlle Zoe Pfeil Prix de Breuilly (Handicap) (4yo+) (All-Weather Track) (Polytrack)6.5f · Standard · 16 ran 16th 48/1
07 Mar 17 Deauville (FR) Colombe Du Moulin (FR)J: Fabien Lefebvre Prix de la Cour Blanche (Handicap) (3yo) (Polytrack)6.5f · Standard · 15 ran 10th 26/1
16 Dec 16 Deauville (FR) Layman Junior (FR)J: Delphine Santiago Prix de la Briqueterie (Handicap) (4yo+) (Polytrack)9.5f · Standard · 16 ran 12th 22/1
29 Aug 16 Deauville (FR) Layman Junior (FR)J: Delphine Santiago Prix du Mesnil-Eudes (Handicap) (5yo+) (Polytrack)9.5f · Standard · 16 ran 5th 24/1
11 Aug 16 Deauville (FR) Layman Junior (FR)J: Delphine Santiago Prix de la Foret de Bord (Handicap) (5yo+) (Polytrack)9.5f · Standard · 16 ran 10th 24/1
09 Jan 16 Deauville (FR) Layman Junior (FR)J: Delphine Santiago Prix de Sainte-Mere Eglise (Handicap) (5yo+) (Polytrack)9.5f · Standard · 16 ran 3rd 101/10
16 Dec 15 Deauville (FR) Layman Junior (FR)J: Delphine Santiago Prix des Cordelles (Handicap) (4yo+) (Polytrack)9.5f · Standard · 16 ran 3rd 247/10
05 Oct 15 Chantilly (FR) Layman Junior (FR)J: Delphine Santiago Prix du Carre de Dressage (Handicap) (5yo+) (Polytrack)10.5f · Standard · 16 ran 2nd 172/10
29 Aug 15 Deauville (FR) Layman Junior (FR)J: Mlle Zoe Pfeil Prix du Bois Barbot (Handicap) (4yo+) (Polytrack)9.5f · Standard · 16 ran 12th 42/1
01 Jul 15 Deauville (FR) Layman Junior (FR)J: Mr Samuel Bossert Prix de Coulonces (Conditions) (4yo+) (Amateur Riders) (Polytrack)9.5f · Standard · 11 ran 7th 33/1
30 Mar 15 Chantilly (FR) Layman Junior (FR)J: Delphine Santiago Prix du Bu (Conditions) (4yo+) (Lady Riders) (Polytrack)9f · Standard · 10 ran 2nd 112/10

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 S Bossert's strike rate?
S Bossert has won 2 of 42 runners since 2008, a strike rate of 4.8% (as at 4 November 2026). Figures are computed from our own results archive.
Is S Bossert in form?
Too few runners in the last 14 days to read — 1 runner, which is not a sample we will draw a conclusion from.
What is S Bossert's Fair A/E?
1.24, from 42 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 4 November 2026, computed from our own results archive (2005 onwards; aggregates from 2008).