• M3 Mulhuddart Services
• MCMA Healthcare
• MCS Group Consultancy
• MGS Mfg. Group
• MYM Recruitment
• Maldron Hotel Kevin Street - Dalata Hotel Group
• Maldron Hotels & Partners
• Manguard Plus
• Mannings Bakery
• Marqette Restaurant Dublin Airport
• Marriott Construction

• Mason Hayes & Curran
• Mater Misericordiae University Hospital
• Mayo University Hospital
• McCabes Pharmacy
• McCartan's Pharmacy
• McCulla Transport
• McSport
• Meagher's Pharmacy
• Medforce
• MediWest Care
• MeiraGTx Holdings

• Menapia Motors
• Mercantile Group Bar
• Mercy University Hospital
• Mespil Hotel
• Metamo
• Metro Hotel Dublin Airport
• Midland Regional Hospital Portlaoise
• Milford Care Centre
• Mitchell Maguire
• Monaghan Mushrooms
• Monasterevin Motors

• Monread Fare
• Moore Cleaning Services
• Moorehall Living
• Morrison Hotel
• Mount Charles Group
• Muiriosa Foundation
• Mullingar Park Hotel
• Munster Technological University