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Horse profile

Aachen (USA)

2yo colt · Trainer Aidan O'Brien · Owner Derrick Smith Mrs John Magnier Michael Tabor
by Gun Runner (USA) out of Monday (USA) (Fastnet Rock)
2 runs · 2 courses · from Aug 2026
As at 1 Nov 2026 · KTB archive: GB, Ireland & France · 2005–present, updated daily
Last run 7 Oct 2026 · 4th of 9
KTB Profile

Aachen is a lightly raced colt by Gun Runner out of the Fastnet Rock mare Monday. His dam has produced three runners for one winner, Trojan Warrior. He made his debut when third of 13 at Dundalk on the AW in Aug 2026 and finished fourth of nine at Navan on soft ground in Oct 2026. He has raced twice over 1m to 1m1f.

Based on 2 archived runs · run-style from 2 commented runs since Aug 2026 · updated 1 Nov 2026

KTB Speed and Rating

KTB Speed

Best recent Speed 82 the best of the last 2 graded (A or B) runs · Dundalk (AW) (IRE), 15 Aug 2026

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 2 figures · best 82B · median 73
GoingRunsBestMedianSince 1 Nov 2025
Soft1——1 run · —
Standard (AW)1——1 run · —
DistanceRunsBestMedianSince 1 Nov 2025
1m – 1m1f282B732 runs · 82 / 73

KTB Speed v1 · batch 15 Sep 2026 · GB & Irish racing only · 2 figures from 2 runs · as at 15 Oct 2026 · a record, not a forecast

KTB Rating

Best recent KTB Rating 75A the best of the last 2 rated runs · Dundalk (AW) (IRE), 15 Aug 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 — 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 2 figures · best 75A · median 70.5
GoingRunsBestMedianSince 1 Nov 2025
Soft1——1 run · —
Standard (AW)1——1 run · —
DistanceRunsBestMedianSince 1 Nov 2025
1m – 1m1f275A70.52 runs · 75 / 70.5

KTB Rating v1 · batch 3 Oct 2026 · GB & Irish racing only · 2 figures from 2 runs · as at 15 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.

Pedigree intelligence

Sire
Gun Runner (USA)

Progeny in our archive have won 9.7% of 62 runs since Jun 2023 (16 horses).

GoingRunsWinsSRvs sireThis horse
Good to Firm500%−9.7—
Good1218.3%−1.4—
Good to Soft7114.3%+4.6—
Soft900%−9.70 from 1
Heavy400%−9.7—
Standard (AW)25416%+6.30 from 1
Distance (all codes)RunsWinsSRvs sireThis horse
Under 6f100%−9.7—
6f – 7f800%−9.7—
1m – 1m1f22313.6%+3.90 from 2
1m2f – 1m4f20315%+5.3—
1m5f – 2m300%−9.7—
2m1f – 2m4f700%−9.7—
2m5f – 3m100%−9.7—

Flat and jumps together (all codes) · since Jun 2023 · as at 1 Nov 2026 · rows under 30 runs muted · win % is the measure, a record not a forecast

Dam
Monday (USA) (Fastnet Rock)

3 siblings in the archive, 1 winner — best of them Trojan Warrior (USA) (1 win).

The wins came over 6f.

ProduceRunsWinsWin tripsBest grade
Trojan Warrior (USA)316f—
One Of A Kind (IRE)50——
Aachen (USA)10——

Too few runs for meaningful splits. The full record is below.

Form

DateCourseRace PosBtn Wgt SpdKTB Jockey SP
2026 · 2 runs
07 Oct 26+53d Navan (IRE) Navan Racecourse Welcomes Our Local Community Maiden 1m · Yielding · 9 ran up with the front pair - denied a clear run on inner over 2f out - 5th over 1f out under pressure - hit 3rd for a spell over 100 yards out - faded near the line and dropped to 4th 4/9 nk 9-2 64A66C Jack Cleary 6/1
15 Aug 26 Dundalk (AW) (IRE) Irish Stallion Farms EBF Maiden 1m · Standard · 13 ran Slow to begin - settled towards the back of the pack - 9th at halfway - urged forward with 2f remaining - improved into 5th inside the final furlong - up to 3rd close home - stayed on at one gear to the line 3/13 1¾ 9-2 82B75A Jack Cleary 12/1

Quick answers

How many races has Aachen won?
Aachen (USA) has yet to win, from 2 archived starts in 2026. Placed 1 time in total (50% of starts).
Who trains Aachen?
Aachen (USA) is trained by Aidan O'Brien, who saddled the horse on its most recent run on 7 October 2026.
Who is Aachen's sire?
Aachen (USA) is by Gun Runner (USA) out of Monday (USA), whose sire is Fastnet Rock.
What is Aachen's sire's record?
Gun Runner (USA)'s progeny in our archive have won 9.7% of 62 runs since Jun 2023 (16 horses), Flat and jumps together.
Who are Aachen's siblings?
Out of Monday (USA), Aachen (USA) has 3 other produce in our archive, 1 of them a winner. Most wins: Trojan Warrior (USA) (1). The wins came over 6f. As at Nov 2026.

Record shown from August 2026. 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.