Four years into training and already with two of Britain's top races on the CV — that is not a bad start by any measure. M D O'Callaghan took out a licence in 2021 and has since built a career tally of 103 winners, a number that tells you this is a yard operating with quiet consistency rather than flash-in-the-pan results. The standout moments have come at two of Britain's most famous tracks: a top-level win at Newmarket in October 2021, almost straight out of the gates as a trainer, and then another at Goodwood in August 2024. Winning at either venue once is something most trainers never manage. Doing it at both, early in a career, marks O'Callaghan out as someone who knows how to prepare a horse for a big occasion.Based on TrackLab's analysis
Our model's view, based on this trainer's record and recent runs
TrackLab's trainer breakdown
The current season tells a more mixed story. Eighteen winners from 204 runners works out at roughly 1 in every 11 races — a 9% win rate that represents a dip from last year's 15%. That kind of drop is worth watching but not panicking over; yards go through quieter spells, and the volume of runners suggests the string is busy and active. More interesting is what happens when the ground gets soft and muddy underfoot. On wet ground, the record sharpens dramatically: 3 wins from just 11 races, which is 27% — closer to 1 in every 4. That is a striking number and suggests O'Callaghan either has a good eye for placing horses in conditions that suit them, or simply has animals in the yard that genuinely relish a test in the mud.
The most reliable partnership in the yard right now involves jockey Jamie Powell, who has ridden 71 times for the trainer and converted 4 of those into winners. At roughly 1 in every 18 rides together, it is not a thunderous win rate, but the sheer volume of their combined outings points to a settled, trusted working relationship — the kind that tends to quietly build over time. The most eye-catching individual pairing is with a horse called Red Evolution, who has won 3 of 12 races for the yard — 1 in every 4 — a figure that stands well above the stable average and marks that horse out as one worth following whenever it lines up.
📈 Form trend
How this trainer's win rate has changed month by month
Monthly win rate
2025–2026
10.5%
Jul
12.9%
Aug
10.3%
Sep
2.9%
Oct
14.3%
Nov
14.3%
Dec
20%
Jan
0%
Feb
6.2%
Mar
20%
Apr
5.3%
May
20%
Jun
🎯 Where this trainer does best
Results split by ground, race level and track shape