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Horse profile

Chelsea Harbour (IRE)

3yo gelding (at last run, Apr 2024) · Last trainer Andrew Balding · Last owner Chelsea Thoroughbreds Ch
by American Pharoah (USA) out of Miss Mahalia (USA) (Uncle Mo)
3 runs · 3 courses · from Sep 2023
As at 4 Nov 2026 · KTB archive: GB, Ireland & France · 2005–present, updated daily
No run recorded since 1 Apr 2024 — 947 days ago. Our archive can't say whether the horse is still in training.
Last run Apr 2024 · 8th of 8
KTB Profile

Chelsea Harbour is a gelding by American Pharoah out of a mare by Uncle Mo. He ran three times between Sep 2023 and Apr 2024 without winning or placing. All three starts came over 1m to 1m4f, two on standard AW and one on soft turf. His last run, at Kempton in Apr 2024, saw him finish eighth of eight in a Class 5 novice stakes.

Based on 3 archived runs · updated 4 Nov 2026

KTB Speed and Rating

KTB Speed

Best recent Speed 77 the best of the last 1 graded (A or B) run · Chelmsford City (AW), 14 Sep 2023

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 3 figures · best 77A · median 49
GoingRunsBestMedianSince 4 Nov 2025
Standard (AW)277A44—
Soft1———
DistanceRunsBestMedianSince 4 Nov 2025
1m – 1m1f277A63—
1m2f – 1m4f1———

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

KTB Rating

Best recent KTB Rating 74A the best of the last 3 rated runs · Chelmsford City (AW), 14 Sep 2023

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 — its best recent day. The KTB Rating on a racecard is a different reading of the same figures: the level the horse has been running to, an average of up to its last six runs with the latest counting most, so the two can differ. A, B or C on a run is how much known form was in that race. What this means →

Flat 3 figures · best 74A · median 56
GoingRunsBestMedianSince 4 Nov 2025
Standard (AW)274A65—
Soft1———
DistanceRunsBestMedianSince 4 Nov 2025
1m – 1m1f274A60.5—
1m2f – 1m4f1———

KTB Rating v1 · batch 3 Oct 2026 · GB & Irish racing only · 3 figures from 3 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 is derived from in-running commentary, which our data provider does not supply for this horse's races.

Pedigree intelligence

Sire
American Pharoah (USA)

Progeny in our archive have won 13.1% of 586 runs since Apr 2019 (90 horses).

Weakest on soft going: 9% from 100.

GoingRunsWinsSRvs sireThis horse
Firm100%−13.1—
Good to Firm551323.6%+10.5—
Good1582415.2%+2.1—
Good to Soft60813.3%+0.2—
Soft10099%−4.10 from 1
Heavy48714.6%+1.5—
Standard (AW)164169.8%−3.30 from 2
Distance (all codes)RunsWinsSRvs sireThis horse
Under 6f10330%+16.9—
6f – 7f1161311.2%−1.9—
1m – 1m1f2263214.2%+1.10 from 2
1m2f – 1m4f1972412.2%−0.90 from 1
1m5f – 2m29517.2%+4.1—
2m1f – 2m4f700%−13.1—
2m5f – 3m100%−13.1—

Flat and jumps together (all codes) · since Apr 2019 · as at 4 Nov 2026 · rows under 30 runs muted · win % is the measure, a record not a forecast

Dam
Miss Mahalia (USA) (Uncle Mo)

1 sibling in the archive, 0 winners.

ProduceRunsWinsWin tripsBest grade
Highfield Jewel (IRE)60——

Record by conditions

GoingRunsWinsSR£1
Standard (AW) 2 0 0% −2.00
Soft 1 0 0% −1.00

ClassRunsWinsSR£1
Class 5 2 0 0% −2.00
Class 4 1 0 0% −1.00

CourseRunsWinsSR£1
Kempton (AW) 1 0 0% −1.00
Bath 1 0 0% −1.00
Chelmsford City (AW) 1 0 0% −1.00

DistanceRunsWinsSR£1
1m – 1m1f 2 0 0% −2.00
1m2f – 1m4f 1 0 0% −1.00

JockeyRunsWinsSR£1
Rob Hornby 2 0 0% −2.00
Jason Watson 1 0 0% −1.00

SeasonRunsWinsSR£1
2024 1 0 0% −1.00
2023 2 0 0% −2.00

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 SpdKTB Jockey SP
2024 · 1 run
01 Apr 24+182d Kempton (AW) Virgin Bet Fives/EBF Novice Stakes (GBB Race) Class 5 · 1m2f · Standard To Slow · 8 ran 8/8 1½ 9-4 11C56C Rob Hornby 40/1
2023 · 2 runs
02 Oct 23+18d Bath British EBF Future Stayers' Novice Stakes (GBB Race) Class 4 · 1m · Soft · 8 ran 8/8 2¾ 9-4 49C47C Rob Hornby 14/1
14 Sep 23 Chelmsford City (AW) Moretti Zero Novice Stakes (GBB Race) Class 5 · 1m · Standard · 8 ran 5/8 nk 9-7 77A74A Jason Watson 18/1

Quick answers

How many races has Chelsea Harbour won?
Chelsea Harbour (IRE) has yet to win, from 3 archived starts between 2023 and 2024.
Who trained Chelsea Harbour?
Chelsea Harbour (IRE) was trained by Andrew Balding on the most recent run on record, at Kempton (AW) on 1 April 2024.
Who is Chelsea Harbour's sire?
Chelsea Harbour (IRE) is by American Pharoah (USA) out of Miss Mahalia (USA), whose sire is Uncle Mo.
What is Chelsea Harbour's sire's record?
American Pharoah (USA)'s progeny in our archive have won 13.1% of 586 runs since Apr 2019 (90 horses), Flat and jumps together. Weakest on soft going: 9% from 100.
Who are Chelsea Harbour's siblings?
Out of Miss Mahalia (USA), Chelsea Harbour (IRE) has 1 other produce in our archive, 0 of them winners. As at Nov 2026.

Record shown from September 2023. Our archive holds racing in Great Britain, Ireland and France from January 2005. Any runs before that, or in other countries, are not in it. In-running comments are available from 2024 onward.