Horse profile
Circuit Breaker (GB)
by Nathaniel (IRE) out of Australian Queen (GB) (Fastnet Rock)
25 runs · 16 courses · from May 2023
As at 18 Oct 2026 · KTB archive: GB, Ireland & France · 2005–present, updated daily
3 wins · Kempton, Kempton (AW) & Windsor
Ran 22 days ago · 3rd of 10
Last raced off OR 68
KTB Profile
Circuit Breaker is 3 from 25 with wins at Kempton, Kempton (AW) and Windsor. He won a Class 4 novices hurdle over 2m5f-3m on good ground at Kempton in Oct 2024 and a Class 4 handicap over 1m5f-2m on standard (AW) at Kempton (AW) the previous year. The gelding, by Nathaniel out of an Australian Queen mare, usually led and finished 3 of 10 in a Class 5 handicap at Haydock in Sep 2026. He last ran off an official rating of 68, 50lb below his highest ever mark.
Based on 25 archived runs · run-style from 5 commented runs · updated 18 Oct 2026
KTB at a glance
Typically led
OR ↓ 50lb off peak
- 3–25Wins / Runs
- 12%Strike rate
- 10 (40%)Placed
- −13.00£1 level staken=25 at SP
- 0.84Fair A/E n=25 · 0.74 incl. margin
- 118Highest OR
- 52dAvg between runs
A/E compares actual wins with what starting prices implied. "Fair" strips the bookmaker margin from the expectation, so favourites and longshots are judged on the same footing — figures near 1.00 mean the market priced this horse about right.
Official rating68↓ 50lb off peak
68
68–118
KTB Speed and Rating
KTB Speed
Best recent Speed 102
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
| Going | Runs | Best | Median | Since 18 Oct 2025 |
|---|---|---|---|---|
| Standard (AW) | 11 | 113A | 99 | 5 · 113 / 99 |
| Soft | 5 | 134C | 111 | 1 · — |
| Good | 3 | 102A | 88 | 2 · 102 / 95 |
| Good to Firm | 1 | — | — | — |
| Distance | Runs | Best | Median | Since 18 Oct 2025 |
|---|---|---|---|---|
| 1m5f – 2m | 18 | 134C | 100.5 | 8 · 113 / 95.5 |
| 1m2f – 1m4f | 2 | 86A | 75 | — |
Jumps
| Going | Runs | Best | Median | Since 18 Oct 2025 |
|---|---|---|---|---|
| Soft | 2 | 121C | 111.5 | 1 · — |
| Good to Soft | 2 | 82C | 81 | — |
| Good | 1 | — | — | — |
| Distance | Runs | Best | Median | Since 18 Oct 2025 |
|---|---|---|---|---|
| 2m5f – 3m | 3 | 121C | 90 | 1 · — |
| 2m1f – 2m4f | 1 | — | — | — |
| 1m5f – 2m | 1 | — | — | — |
KTB Speed v1 · batch 15 Sep 2026 · GB & Irish racing only · 25 figures from 25 runs · as at 3 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 5 analysed runs
- Led 4 (80%) · 1 win
- Held up 1 (20%) · 0 wins
Pedigree intelligence
Sire
Progeny in our archive have won 11.6% of 7,057 runs since Jan 2008 (633 horses).
Weakest over 6f – 7f (all codes): 6.2% from 324.
| Going | Runs | Wins | SR | vs sire | This horse |
|---|---|---|---|---|---|
| Firm | 21 | 4 | 19% | +7.4 | — |
| Good to Firm | 784 | 102 | 13% | +1.4 | 0 from 1 |
| Good | 1,865 | 231 | 12.4% | +0.8 | 1 from 4 |
| Good to Soft | 1,001 | 114 | 11.4% | −0.2 | 0 from 2 |
| Soft | 1,222 | 140 | 11.5% | −0.1 | 1 from 7 |
| Heavy | 403 | 47 | 11.7% | +0.1 | — |
| Standard (AW) | 1,759 | 183 | 10.4% | −1.2 | 1 from 11 |
| Distance (all codes) | Runs | Wins | SR | vs sire | This horse |
|---|---|---|---|---|---|
| Under 6f | 4 | 0 | 0% | −11.6 | — |
| 6f – 7f | 324 | 20 | 6.2% | −5.4 | — |
| 1m – 1m1f | 876 | 78 | 8.9% | −2.7 | — |
| 1m2f – 1m4f | 2,494 | 331 | 13.3% | +1.7 | 1 from 2 |
| 1m5f – 2m | 2,138 | 252 | 11.8% | +0.2 | 1 from 19 |
| 2m1f – 2m4f | 815 | 91 | 11.2% | −0.4 | 0 from 1 |
| 2m5f – 3m | 337 | 32 | 9.5% | −2.1 | 1 from 3 |
| Over 3m | 69 | 17 | 24.6% | +13 | — |
Flat and jumps together (all codes) · since Jan 2008 · as at 17 Oct 2026 · rows under 30 runs muted · win % is the measure, a record not a forecast
Dam
Australian Queen (GB) (Fastnet Rock)
3 siblings in the archive, 1 winner — best of them Outback Heat (GB) (2 wins).
The wins came over 1m; the highest grade won is Class 4 (Outback Heat (GB)).
| Produce | Runs | Wins | Win trips | Best grade |
|---|---|---|---|---|
| Outback Heat (GB) | 5 | 2 | 1m | Class 4 |
| Frankelian (GB) | 9 | 0 | — | — |
| Highland Monarch (GB) | 1 | 0 | — | — |
Record by conditions
| Going | Runs | Wins | SR | £1 |
|---|---|---|---|---|
| Standard (AW) | 11 | 1 | 9% | −6.50 |
| Soft | 7 | 1 | 14% | −4.00 |
| Good | 4 | 1 | 25% | +0.50 |
| Good to Soft | 2 | 0 | 0% | −2.00 |
| Good to Firm | 1 | 0 | 0% | −1.00 |
| Class | Runs | Wins | SR | £1 |
|---|---|---|---|---|
| Class 4 | 11 | 2 | 18% | −2.00 |
| Class 5 | 7 | 1 | 14% | −4.00 |
| Class 2 | 4 | 0 | 0% | −4.00 |
| Class 3 | 3 | 0 | 0% | −3.00 |
| Course | Runs | Wins | SR | £1 |
|---|---|---|---|---|
| Wolverhampton (AW) | 4 | 0 | 0% | −4.00 |
| Haydock | 3 | 0 | 0% | −3.00 |
| Lingfield (AW) | 2 | 0 | 0% | −2.00 |
| Ascot | 2 | 0 | 0% | −2.00 |
| Southwell (AW) | 2 | 0 | 0% | −2.00 |
| Kempton (AW) | 2 | 1 | 50% | +2.50 |
| Carlisle | 1 | 0 | 0% | −1.00 |
| Market Rasen | 1 | 0 | 0% | −1.00 |
| York | 1 | 0 | 0% | −1.00 |
| Newcastle (AW) | 1 | 0 | 0% | −1.00 |
| Musselburgh | 1 | 0 | 0% | −1.00 |
| Kempton | 1 | 1 | 100% | +3.50 |
| Salisbury | 1 | 0 | 0% | −1.00 |
| Hamilton | 1 | 0 | 0% | −1.00 |
| Doncaster | 1 | 0 | 0% | −1.00 |
| Windsor | 1 | 1 | 100% | +2.00 |
| Distance | Runs | Wins | SR | £1 |
|---|---|---|---|---|
| 1m5f – 2m | 19 | 1 | 5% | −14.50 |
| 2m5f – 3m | 3 | 1 | 33% | +1.50 |
| 1m2f – 1m4f | 2 | 1 | 50% | +1.00 |
| 2m1f – 2m4f | 1 | 0 | 0% | −1.00 |
| Jockey | Runs | Wins | SR | £1 |
|---|---|---|---|---|
| Cieren Fallon | 6 | 0 | 0% | −6.00 |
| Jonjo O'Neill Jr | 4 | 1 | 25% | +0.50 |
| Jack Dace | 2 | 0 | 0% | −2.00 |
| Hector Crouch | 2 | 1 | 50% | +2.50 |
| Rossa Ryan | 2 | 1 | 50% | +1.00 |
| Mr Simon Walker | 1 | 0 | 0% | −1.00 |
| Daniel Tudhope | 1 | 0 | 0% | −1.00 |
| Harry Burns | 1 | 0 | 0% | −1.00 |
| Kieran Shoemark | 1 | 0 | 0% | −1.00 |
| Kevin Brogan | 1 | 0 | 0% | −1.00 |
| Ray Dawson | 1 | 0 | 0% | −1.00 |
| Joe Fanning | 1 | 0 | 0% | −1.00 |
| James Doyle | 1 | 0 | 0% | −1.00 |
| Shane Gray | 1 | 0 | 0% | −1.00 |
| Headgear | Runs | Wins | SR | £1 |
|---|---|---|---|---|
| None | 18 | 2 | 11% | −10.50 |
| Tongue tie | 6 | 1 | 17% | −1.50 |
| Cheekpieces | 1 | 0 | 0% | −1.00 |
| Season | Runs | Wins | SR | £1 |
|---|---|---|---|---|
| 2026 | 8 | 0 | 0% | −8.00 |
| 2025 | 7 | 0 | 0% | −7.00 |
| 2024 | 5 | 1 | 20% | −0.50 |
| 2023 | 5 | 2 | 40% | +2.50 |
| Type | Runs | Wins | SR | £1 |
|---|---|---|---|---|
| Flat | 20 | 2 | 10% | −12.50 |
| Hurdle | 5 | 1 | 20% | −0.50 |
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
| Date | Course | Race | Pos | Btn | Wgt | OR | Spd | KTB | Jockey | SP |
|---|---|---|---|---|---|---|---|---|---|---|
| 25 Sep 26+38d | Haydock | Turf Services Handicap Stakes Settled in the pack - pushed along with 3f left then advanced approaching the final furlong - stayed on to grab third close home | 3/10 | 1¾ | 9-7 | 68 | 83A | 82A | Cieren Fallon | 5/1 |
| 18 Aug 26+64d | Lingfield (AW) | Follow @AtTheRaces On Instagram Amateur Jockeys' Handicap Stakes Set the pace early - urged forward with over a furlong left before being overtaken nearing the last furlong - faded quickly after | 4/7 | 3¼ | 11-2 | 70 | 86A | 80A | Mr Simon Walker | 1/1F |
| 15 Jun 26+38d | Carlisle | racingtv.com Handicap Took the initiative - nudged into action 3f out - surrendered advantage over 1f out - found nothing in the closing stages | 4/11 | 1¼ | 9-6 | 72 | 102A | 78A | Daniel Tudhope | 9/2 |
| 08 May 26+35d | Ascot | Peroni Nastro Azzurro 0.0% Apprentice Handicap (GBBPlus Race) Went straight to front and dictated a steady gallop - driven up when overtaken with 2f left - lost touch inside final furlong to finish sixth | 6/12 | ¾ | 9-8 | 74 | 88A | 76A | Harry Burns | 16/1 |
| 03 Apr 26+31d | Lingfield (AW) | Midnite All-Weather Vase Marathon Handicap (GBBPlus Race) Fought for control early - hit front - urged along 3f out - overtaken 2f out then edged out of second entering last furlong - unable to live with pace and finished third | 3/14 | 2¼ | 9-4 | 74 | 99B | 82A | Kieran Shoemark | 18/1 |
| 03 Mar 26+30d | Wolverhampton (AW) | Midnite Are Upping The Betting Game Handicap (GBBPlus Race) Tracked the front group early - hit trouble for space and slipped back with a furlong left - moved right but couldn't find another gear - finished sixth | 6/8 | 2½ | 9-9 | 75 | 113A | 73A | Cieren Fallon | 11/1 |
| 01 Feb 26+26d | Market Rasen | Weatherbys Cheltenham Festival Betting Guide Handicap Hurdle Sat close to the front group early - lost touch without response before 2 out - well held at the finish | 6/7 | 17 | 11-2 | 111 | 121C | 92C | Kevin Brogan | 10/1 |
| 06 Jan 26+7d | Wolverhampton (AW) | Midnite A Next Generation Betting App Handicap Set the pace early - lost the front before 2f - settled into third and tracked from the rear of that group - urged on to close from 2f out and stayed on without gaining ground late | 2/6 | ½ | 9-9 | 75 | 92A | 76B | Jack Dace | 5/2 |
| 30 Dec 25+80d | Wolverhampton (AW) | Midnite, Building The Future Of Betting Apprentice Handicap Raced with plenty of enthusiasm early - hit the front - pushed along with 2f remaining and stayed on inside the final furlong - edge eroded and overtaken close home to finish second | 2/8 | 1 | 9-13 | 75 | 107A | 81A | Jack Dace | 9/2 |
| 11 Oct 25+176d | York | Coral Racing Club Stayers Handicap (GBBPlus Race) Fretful before the off - settled just behind pace then hit the front approaching 2f - held advantage through the straight - overtaken 3f out - kept on in pursuit - faded inside final 2f to finish ninth | 9/16 | nk | 9-7 | 78 | 76C | 77A | Ray Dawson | 20/1 |
| 18 Apr 25+21d | Newcastle (AW) | BetUK All-Weather Championships Marathon Handicap (GBBPlus Race) Up with the front group - niggled at past the 2f marker - dropped away quickly to finish 11th | 11/14 | 1½ | 8-4 | 82 | 108C | 70C | Joe Fanning | 28/1 |
| 28 Mar 25+13d | Southwell (AW) | BetUK. It's Where The UK Bets Handicap (GBB Plus Race) Went straight to front - dictated a steady gallop - pushed along entering home turn then lost command 2f out - dropped away in the last furlong to finish sixth | 6/8 | 4½ | 10-0 | 85 | 93A | 74A | Cieren Fallon | 6/1 |
| 15 Mar 25+21d | Wolverhampton (AW) | BetUK: It's Where The UK Bets Handicap (GBB Plus Race) Set the pace early - lost the advantage 8f out and driven approaching 3f out - faded final furlong to finish 5th | 5/5 | 1½ | 9-3 | 87 | 73C | 76B | Cieren Fallon | 11/2 |
| 22 Feb 25+20d | Southwell (AW) | BetUK. It's Where The UK Bets Handicap (GBB Plus Race) Settled off the pace in the pack - moved through on the outer 6f out to hit the front - lost that advantage 3f out - stayed on to finish third | 3/9 | 1½ | 10-0 | 88 | 107A | 92A | Cieren Fallon | 11/1 |
| 02 Feb 25+43d | Musselburgh | Each Way Extra At bet365 Handicap Hurdle Went straight to front - shared the advantage before edging back in command - pressed for effort and lost pole position approaching 3 out - dropped away rapidly from 2 out to finish well beaten | 8/10 | ½ | 12-0 | 115 | 80B | 104A | Jonjo O'Neill Jr | 14/1 |
| 21 Dec 24+17d | Ascot | Thames Materials Novices' Handicap Hurdle (GBB Race) Settled off the pace at the back - hit a hurdle three out - dropped away before two out - eventually finished fifth | 5/6 | 50 | 11-13 | 118 | 82C | 102C | Jonjo O'Neill Jr | 16/1 |
| 04 Dec 24+45d | Haydock | TrustATrader Approved And Reviewed Tradespeople 'Introductory' Hurdle (GBB Race) Sat close to leader early - couldn't quicken when tested 2 out - dropped to third near the last - finished well beaten in third | 3/6 | 7 | 11-7 | — | 102B | 120B | Jonjo O'Neill Jr | 15/2 |
| 20 Oct 24+157d | Kempton | TrustATrader trustatrader.com Novices' Hurdle (GBB Race) Sat second on rail early - driven along on the turn - went in front before the final two furlongs - stayed on strongly to score | 1/4 | 10-12 | — | 90C | 126B | Jonjo O'Neill Jr | 7/2 | |
| 16 May 24+40d | Salisbury | Al Basti Equiworld Dubai 'city Bowl' Handicap | 6/12 | 1½ | 9-10 | 89 | 134C | 78C | Cieren Fallon | 15/2 |
| 06 Apr 24+190d | Kempton (AW) | Virgin Bet Queen's Prize Handicap | 3/13 | 1¾ | 9-3 | 89 | 107B | 82A | James Doyle | 5/1 |
| 29 Sep 23+20d | Haydock | cavani.co.uk Jockey And Jacket Live Handicap | 2/5 | 1 | 9-9 | 87 | 122C | 87B | Hector Crouch | 3/1J |
| 09 Sep 23+56d | Kempton (AW) | Try Unibet's Improved Bet Builder Handicap | 1/8 | 9-4 | 83 | 92A | 80A | Hector Crouch | 7/2 | |
| 15 Jul 23+43d | Hamilton | Stay At Hampton By Hilton Hamilton Park Handicap | 7/7 | 3 | 9-3 | 85 | 111B | 68A | Shane Gray | 10/3 |
| 02 Jun 23+25d | Doncaster | Walk As One For Weston Park Novice Stakes (GBB Race) | 3/5 | 6½ | 9-11 | — | 64C | 70B | Rossa Ryan | 10/3 |
| 08 May 23 | Windsor | Cameron Smart Memorial Maiden Stakes (GBB Race) (Div 1) | 1/8 | 9-1 | — | 86A | 83A | Rossa Ryan | 2/1F |
Quick answers
- How many races has Circuit Breaker (GB) won?
- Circuit Breaker (GB) won 3 of 25 archived starts between 2023 and 2026, a strike rate of 12%. Placed 10 times in total (40% of starts).
- Who trains Circuit Breaker (GB)?
- Circuit Breaker (GB) is trained by Jonjo & A.J. O'Neill, who saddled the horse on its most recent run on 25 September 2026.
- Who is Circuit Breaker (GB)'s sire?
- Circuit Breaker (GB) is by Nathaniel (IRE) out of Australian Queen (GB), whose sire is Fastnet Rock.
- What going does Circuit Breaker (GB) prefer?
- Circuit Breaker (GB) has the best record on good going: 1 win from 4 starts (25%). Only going bands with at least three archived starts are read, so this is a direction rather than a settled preference.
- What is Circuit Breaker (GB)'s official rating?
- The most recent official rating on record is 68, from the run on 25 September 2026. The highest on record is 118.
- What is Circuit Breaker (GB)'s sire's record?
- Nathaniel (IRE)'s progeny in our archive have won 11.6% of 7,057 runs since Jan 2008 (633 horses), Flat and jumps together. Weakest over 6f – 7f (all codes): 6.2% from 324.
- Who are Circuit Breaker (GB)'s siblings?
- Out of Australian Queen (GB), Circuit Breaker (GB) has 3 other produce in our archive, 1 of them a winner. Most wins: Outback Heat (GB) (2). Highest grade won: Class 4 (Outback Heat (GB)). The wins came over 1m. As at Oct 2026.