| Registered Name | Owner / Club | Status |
|---|---|---|
| Matchmaker | Sheena Kinsella Cheval | Approved |
| Matilda's Melody | Andrea Finnegan Coole Lane | Approved |
| Matildas Mossy | Hanna Bjoremark Mill Road | Approved |
| Matinee | Niamh Murphy Waterford | Approved |
| Maverick Na Ri | Jacqui Boland Killossery | Approved |
| Max Baer (IRE) | Patricia Newman Mosstown | Approved |
| Max Dynamite | Mary Murphy Benbulben | Approved |
| Max Flight | Eugene Mc Sweeney Warrington | Approved |
| Maximillion's Shootin' Star | Anna Toland Hillcrest | Approved |
| Maximus | Christian Josewski Mullingar | Approved |
| Maximus (IPSA) | Stephanie Forde Corrib | Approved |
| Maximus De Reve | Clara O'Donnell Greenvalley | Approved |
| Maximus Diamond | Declan O'Shea West Cork | Approved |
| Maximus Leviticus | Mervyn Sleeth Ard Lu | Approved |
| Maximus Mirrilus | Mary Fenlon Bourke Enniskerry | Approved |