How many races has Grand Prix Boss won?

Grand Prix Boss (JPN) has yet to win, from 1 archived start in 2011.

Who trained Grand Prix Boss?

Grand Prix Boss (JPN) was trained by Yoshito Yahagi on the most recent run on record, at Ascot on 14 June 2011.

Who is Grand Prix Boss's sire?

Grand Prix Boss (JPN) is by Sakura Bakushin O (JPN) out of Rosy Mist (JPN), whose sire is Sunday Silence.

What is Grand Prix Boss's official rating?

The most recent official rating on record is 114, from the run on 14 June 2011.

What is Grand Prix Boss's sire's record?

Sakura Bakushin O (JPN)'s progeny in our archive have won 0% of 1 run since Jun 2011 (1 horse), Flat and jumps together. A small sample.

Horse profile

Grand Prix Boss (JPN)

3yo colt (at last run, Jun 2011) · Last trainer Yoshito Yahagi · Last owner Grand Prix Co Ltd

by Sakura Bakushin O (JPN) out of Rosy Mist (JPN) (Sunday Silence)

1 run · 1 course · from Jun 2011

As at 4 Nov 2026 · KTB archive: GB, Ireland & France · 2005–present, updated daily

No run recorded since 14 Jun 2011 — 5,622 days ago. Our archive can't say whether the horse is still in training.

Last run Jun 2011 · 8th of 9 Last raced off OR 114

KTB Profile

Lightly raced, with 1 archived start in Jun 2011 as a 3yo colt. Finished 8 of 9 at Ascot last time.

Based on 1 archived run · updated 4 Nov 2026

0–1Wins / Runs
0%Strike rate
0 (0%)Placed
−1.00£1 level staken=1 at SP
114Highest OR

KTB Speed and Rating

KTB Speed

No KTB Speed figures for this horse. The engine scores GB and Irish racing from Oct 2016; runs elsewhere, or earlier, have no figure.

KTB Speed v1 · batch 15 Sep 2026 · GB & Irish racing only · 0 figures from 0 runs · a record, not a forecast

KTB Rating

Best recent KTB Rating 76^C the best of the last 1 rated run · Ascot, 14 Jun 2011 Official rating 114 at the last run, 14 Jun 2011

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 1 figure · too few for a breakdown

KTB Rating v1 · batch 3 Oct 2026 · GB & Irish racing only · 1 figure from 1 run · 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

Sakura Bakushin O (JPN)

Progeny in our archive have won 0% of 1 run since Jun 2011 (1 horse). A small sample.

Going	Runs	Wins	SR	vs sire	This horse
Good	1	0	0%	0	0 from 1

Distance (all codes)	Runs	Wins	SR	vs sire	This horse
1m – 1m1f	1	0	0%	0	0 from 1

Flat and jumps together (all codes) · since Jun 2011 · as at 4 Nov 2026 · rows under 30 runs muted · win % is the measure, a record not a forecast

Dam

Rosy Mist (JPN) (Sunday Silence)

No other produce in our archive. It holds racing in Great Britain, Ireland and France from 2005, so siblings racing elsewhere won’t appear here.

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

Form

Date	Course	Race	Pos	Btn	Wgt	OR	KTB	Jockey	SP
2011 · 1 run
14 Jun 11	Ascot	St James's Palace Stakes (Group 1) Class 1 · 1m · Good · 9 ran	8/9	13	9-0	114	76^C	Mirco Demuro	16/1

Quick answers

How many races has Grand Prix Boss won?: Grand Prix Boss (JPN) has yet to win, from 1 archived start in 2011.
Who trained Grand Prix Boss?: Grand Prix Boss (JPN) was trained by Yoshito Yahagi on the most recent run on record, at Ascot on 14 June 2011.
Who is Grand Prix Boss's sire?: Grand Prix Boss (JPN) is by Sakura Bakushin O (JPN) out of Rosy Mist (JPN), whose sire is Sunday Silence.
What is Grand Prix Boss's official rating?: The most recent official rating on record is 114, from the run on 14 June 2011.
What is Grand Prix Boss's sire's record?: Sakura Bakushin O (JPN)'s progeny in our archive have won 0% of 1 run since Jun 2011 (1 horse), Flat and jumps together. A small sample.