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Horse profile

Understudy (GB)

4yo filly · Trainer Francis-Henri Graffard · Owner Resolute Bloodstock
by Sea The Stars (IRE) out of Sequester (GB) (Selkirk)
11 runs · 8 courses · from May 2025
As at 25 Oct 2026 · KTB archive: GB, Ireland & France · 2005–present, updated daily
Won at Southwell (AW) Last run 26 Sep 2026 · 6th of 8 Last raced off OR 100
KTB Profile

Understudy won her only race from 11 starts at Class 5 level in the Sky Sports Racing Sky 415 Fillies Novice Stakes at Southwell over 1m2f – 1m4f on Standard going in May 2025. All wins at Class 5. The win came on the all-weather. She finished 6 of 8 at Lyon Parilly in Sep 2026 last raced off OR 100.

Based on 11 archived runs · run-style from 6 commented runs since May 2025 · updated 25 Oct 2026
KTB at a glance Won on AW, 0 on turf Win at Class 5
Official rating100↓ 2lb off peak
100 100–102

KTB Speed and Rating

KTB Speed

Best recent Speed 106 the best of the last 3 graded (A or B) runs · Newmarket, 19 Jul 2025

How fast the horse ran, as points against the day-corrected standard time for its course and distance: 100 is the median GB Class 4 handicap winner on that code; one point is 0.1% of the standard time. A, B or C is how much the day's card could tell us, not how good the run was. What this means →

Flat 6 figures · best 106A · median 90.5
GoingRunsBestMedianSince 25 Oct 2025
Standard (AW)2105B971 run · —
Good to Firm292A84.5—
Good to Soft1———
Good1———
DistanceRunsBestMedianSince 25 Oct 2025
1m2f – 1m4f5106A89—
1m5f – 2m1——1 run · —

KTB Speed v1 · batch 15 Sep 2026 · GB & Irish racing only · 6 figures from 6 runs · as at 3 Oct 2026 · a record, not a forecast

KTB Rating

Best recent KTB Rating 83A the best of the last 3 rated runs · Lingfield (AW), 20 Nov 2025 Official rating 100 at the last run, 26 Sep 2026

What the horse achieved in each race, in pounds on the official-rating scale, from the weight carried, the lengths beaten and the race's own level solved across the archive — never the market, never the official rating as a starting point. The headline is the best of the horse's last three rated runs on that code. A, B or C on a run is how much known form was in that race. What this means →

Flat 6 figures · best 90A · median 83
GoingRunsBestMedianSince 25 Oct 2025
Standard (AW)283A831 run · —
Good to Firm290A86.5—
Good to Soft1———
Good1———
DistanceRunsBestMedianSince 25 Oct 2025
1m2f – 1m4f590A83—
1m5f – 2m1——1 run · —

KTB Rating v1 · batch 3 Oct 2026 · GB & Irish racing only · 6 figures from 6 runs · as at 4 Oct 2026 · a record, not a forecast

Both figures are KTB's own, computed from the archive; no vendor rating enters either. Every run's figure is on its form line below with its grade. Grades measure how much the archive could see, never the merit of the run.

Run style from 6 analysed runs since May 2025

  • Held up 2 (33%) · 0 wins
  • Prominent 2 (33%) · 0 wins
  • Mid-division 1 (17%) · 0 wins
  • Led 1 (17%) · 1 win

Pedigree intelligence

Sire
Sea The Stars (IRE)

Progeny in our archive have won 15.7% of 9,946 runs since Jan 2008 (1,112 horses).

Strongest on good to firm going: 18.9% from 1,503. Weakest on heavy going: 9.2% from 455. Weakest over 2m5f – 3m (all codes): 11.5% from 139.

GoingRunsWinsSRvs sireThis horse
Firm18316.7%+1—
Good to Firm1,50328418.9%+3.20 from 2
Good2,64642115.9%+0.20 from 1
Good to Soft1,23820516.6%+0.90 from 4
Soft1,52718612.2%−3.50 from 1
Heavy455429.2%−6.5—
Standard (AW)2,55842316.5%+0.81 from 2
Distance (all codes)RunsWinsSRvs sireThis horse
Under 6f27414.8%−0.9—
6f – 7f77211314.6%−1.1—
1m – 1m1f2,10033516%+0.3—
1m2f – 1m4f4,41275717.2%+1.51 from 8
1m5f – 2m1,89126313.9%−1.80 from 3
2m1f – 2m4f5847312.5%−3.2—
2m5f – 3m1391611.5%−4.2—
Over 3m21314.3%−1.4—

Flat and jumps together (all codes) · since Jan 2008 · as at 24 Oct 2026 · rows under 30 runs muted · win % is the measure, a record not a forecast

Dam
Sequester (GB) (Selkirk)

4 siblings in the archive, 2 winners — best of them Auriferous (IRE) (1 win).

The wins came over 1m2f–1m4f; the highest grade won is Class 4 (American Flag (IRE)).

ProduceRunsWinsWin tripsBest grade
Auriferous (IRE)2011m4fClass 5
American Flag (IRE)611m2fClass 4
Commandeer (IRE)20——
Understudy (GB)10——

Record by conditions

GoingRunsWinsSR£1
Good to Soft 4 0 0% −4.00
Standard (AW) 2 1 50% +0.25
Good to Firm 2 0 0% −2.00
Soft 1 0 0% −1.00
Good 1 0 0% −1.00

ClassRunsWinsSR£1
Class 1 7 0 0% −7.00
2 1 0 0% −1.00
Class 5 1 1 100% +1.25
Class 2 1 0 0% −1.00

CourseRunsWinsSR£1
Newmarket 3 0 0% −3.00
Clairefontaine (FR) 2 0 0% −2.00
Lyon Parilly (FR) 1 0 0% −1.00
Longchamp (FR) 1 0 0% −1.00
Lingfield (AW) 1 0 0% −1.00
Deauville (FR) 1 0 0% −1.00
Ascot 1 0 0% −1.00
Southwell (AW) 1 1 100% +1.25

DistanceRunsWinsSR£1
1m2f – 1m4f 8 1 13% −5.75
1m5f – 2m 3 0 0% −3.00

JockeyRunsWinsSR£1
Oisin Murphy 4 0 0% −4.00
Robert Havlin 2 0 0% −2.00
Hugo Boutin 1 0 0% −1.00
Mickael Barzalona 1 0 0% −1.00
Clement Lecoeuvre 1 0 0% −1.00
Mme Marie Velon 1 0 0% −1.00
Tyler Heard 1 1 100% +1.25

HeadgearRunsWinsSR£1
None 7 1 14% −4.75
Tongue tie 4 0 0% −4.00

SeasonRunsWinsSR£1
2026 4 0 0% −4.00
2025 7 1 14% −4.75

Splits include every sample, however small — muted rows are under 3 runs. A one-from-one record is a fact, not a trend: read the Runs column before the strike rate.

Form

DateCourseRace PosBtn Wgt ORSpdKTB Jockey SP
2026 · 4 runs
26 Sep 26+23d Lyon Parilly (FR) Gp Des Provinces-Px Andre Baboin-13e Etape Defi Du GALOP-G.CAMPRUBI Class 1 · 12f · 8 ran 6/8 nse 8-11 100—— Hugo Boutin 4/1
03 Sep 26+33d Longchamp (FR) Prix Joubert Class 1 · 14f · Very Soft · 11 ran 5/11 1½ 9-3 100—— Mickael Barzalona 9/1
01 Aug 26+21d Clairefontaine (FR) Caen Tattoo Festival - Prix Luth Enchantee Class 1 · 12f · Good To Soft · 8 ran 7/8 4½ 8-13 100—— Clement Lecoeuvre 15/8F
11 Jul 26+233d Clairefontaine (FR) Prix Perrault Stakes 2 · 14.5f · Good To Soft · 7 ran 2/7 nk 8-8 100—— Mme Marie Velon 11/8F
2025 · 7 runs
20 Nov 25+55d Lingfield (AW) BetMGM River Eden EBF Fillies' Stakes (Listed) (GBBPlus Race) Class 1 · 13f · Standard · 13 ran Held up in the pack - pushed along with 2f left - swung wide and gained ground around the turn - pressed for effort inside the last furlong - moved into second but couldn't get past the winner 2/13 1¼ 9-0 101105B83A Robert Havlin 3/1
26 Sep 25+40d Newmarket Princess Royal Stakes (Sponsored By Boyle Sports) (Fillies' & Mares' Group 3) Class 1 · 12f · Good To Firm · 11 ran Settled towards the back - urged into contention among the trailing two 3f out and closed on the front group but drifted right approaching the final furlong - stayed on at one gait to finish 6th 6/11 hd 8-12 10277A83A Oisin Murphy 10/1
17 Aug 25+29d Deauville (FR) The Aga Khan Studs Prix Lady O'Reilly (3yo Fillies) (Round Course) (Turf) 12.5f · Good To Soft · 10 ran 4/10 nk 8-13 ——— Oisin Murphy 17/5
19 Jul 25+30d Newmarket Ric And Mary Hambro Aphrodite Fillies' Stakes (Fillies' & Mares' Listed) (GBBPlus Race) Class 1 · 12f · Good To Soft · 10 ran Sat behind front two early - asked for effort 3f out - moved up to challenge 2f out - found little inside final two furlongs - dropped away close home to finish fifth 5/10 4 8-9 102106A72A Oisin Murphy 4/1
19 Jun 25+19d Ascot Ribblesdale Stakes (Fillies' Group 2) Class 1 · 12f · Good To Firm · 11 ran Settled towards the back of the pack early - made progress two out - moved left approaching the final furlong - kept going to take second close home - unable to threaten the winner 2/11 3¼ 9-2 —92A90A Robert Havlin 40/1
31 May 25+29d Southwell (AW) Sky Sports Racing Sky 415 Fillies' Novice Stakes (GBB Race) Class 5 · 12f · Standard · 10 ran In front early - settled just behind the pace before sitting handy on the rail with cover - travelling smoothly around the home bend - hit the front inside the last two furlongs - kicked away a furlong out - finished strongly for the win 1/10 8-13 —89A83A Tyler Heard 5/4F
02 May 25 Newmarket Darley EBF Maiden Fillies' Stakes (GBB/GBBPlus Race) Class 2 · 10f · Good · 6 ran Sat close up with the pace near the far flank - pushed along and asked to quicken 2f out - drifted left under pressure and lost momentum inside final furlong - finished fourth beaten 4¾ lengths 4/6 3½ 9-1 —75A77B Oisin Murphy 13/2

Quick answers

How many races has Understudy won?
Understudy (GB) won 1 of 11 archived starts between 2025 and 2026, a strike rate of 9.1%. Placed 4 times in total (36.4% of starts).
Who trains Understudy?
Understudy (GB) is trained by Francis-Henri Graffard, who saddled the horse on its most recent run on 26 September 2026.
Who is Understudy's sire?
Understudy (GB) is by Sea The Stars (IRE) out of Sequester (GB), whose sire is Selkirk.
What is Understudy's official rating?
The most recent official rating on record is 100, from the run on 26 September 2026. The highest on record is 102.
What is Understudy's sire's record?
Sea The Stars (IRE)'s progeny in our archive have won 15.7% of 9,946 runs since Jan 2008 (1,112 horses), Flat and jumps together. Strongest on good to firm going: 18.9% from 1,503. Weakest on heavy going: 9.2% from 455. Weakest over 2m5f – 3m (all codes): 11.5% from 139.
Who are Understudy's siblings?
Out of Sequester (GB), Understudy (GB) has 4 other produce in our archive, 2 of them winners. Most wins: Auriferous (IRE) (1). Highest grade won: Class 4 (American Flag (IRE)). The wins came over 1m2f–1m4f. As at Oct 2026.

Record shown from May 2025. Our archive holds racing in Great Britain, Ireland and France from January 2005. Runs in other countries are not in it, and earlier runs are not available from our data provider. In-running comments are available from 2024 onward.