The highlight of his recent form came on 17 June 2025, when he won a Class 1 race at Ascot — one of the most prestigious venues in British racing — following a similar top-level success at Haydock Park just weeks earlier in May. Winning at that level twice in the space of a month is no accident. These are the races where the best horses in the country turn up, and getting the job done under that kind of pressure says something about where Mulrennan stands in the sport.
His most reliable working relationship is with trainer Jim Goldie, and the numbers tell the story clearly: 36 wins from 241 rides together, which works out at roughly 1 in every 7 — well above the average for most jockey-trainer partnerships. When Goldie puts Mulrennan up, it is not just habit; it is a combination that consistently delivers.
This season, Mulrennan has ridden 82 winners from 785 races — winning roughly 1 in every 10, or 10% of the time. That is a slight dip from last year's 15%, and it is worth being honest about: the numbers have come back a little. But raw win rate does not always capture the full picture, and one area where Mulrennan stands out is in wet or muddy conditions. On slow ground he has won 3 from 13 races this season — a 23% win rate, or nearly 1 in every 4 — which suggests he is particularly effective when the weather turns and lesser riders struggle to adapt. Some jockeys find a way to lift horses through testing conditions; Mulrennan appears to be one of them.
Four years into a career that already includes 443 winners and a clutch of the biggest prizes in the sport, the slight dip in numbers this season looks more like a blip than a trend. The Ascot and Haydock wins alone suggest there is plenty more to come.
| Course | Races | Wins | Win rate |
|---|---|---|---|
| Newcastle | 210 | 15 | 7.1% |
| Southwell | 77 | 7 | 9.1% |
| Musselburgh | 72 | 10 | 13.9% |
| Ayr | 69 | 13 | 18.8% |
| Hamilton Park | 60 | 10 | 16.7% |
| Haydock Park | 46 | 7 | 15.2% |
| Thirsk | 44 | 5 | 11.4% |
| Carlisle | 36 | 2 | 5.6% |
| York | 27 | 3 | 11.1% |
| Catterick Bridge | 19 | 3 | 15.8% |
| Beverley | 17 | 2 | 11.8% |
| Redcar | 17 | 1 | 5.9% |
| Doncaster | 17 | 0 | 0% |
| Wolverhampton | 17 | 0 | 0% |
| Pontefract | 14 | 0 | 0% |
| Ripon | 10 | 2 | 20% |
| Chester | 8 | 0 | 0% |
| Nottingham | 7 | 0 | 0% |
| Ascot | 6 | 1 | 16.7% |
| Wetherby | 3 | 1 | 33.3% |
| Newmarket | 3 | 0 | 0% |
| Goodwood | 2 | 0 | 0% |
| Leicester | 2 | 0 | 0% |
| Lingfield Park | 2 | 0 | 0% |