• MCC Cleaning Services
• MCR Group - MCR Outsourcing
• MCS Group
• MSD Ireland
• MSL Engineering Limited
• Mainline Utilities Group Ltd. T/a
• Mamica Ltd. t/a The Firm
• Manpower Ireland
• Maria Logan Recruitment
• Marks Sattin
• Marriott International, Inc
• Marsh & McLennan Companies, Inc
• Martinsen Mayer

• Mason Alexander
• Mastercard
• MatchMedics
• Mater Private Healthcare
• MathWorks
• Matrix Recruitment Group
• Mattinson Partnership
• Maxi Zoo (Fressnapf Group)
• McCurrach
• McDonald’s Restaurants of Ireland
• McGregor Boyall Associates Limited
• McMahons
• Md7 International

• Medical Account Services Ltd t/a
• Medtronic, Inc
• Mercer LLC
• Mercury Engineering
• Merrion Hotel
• MetLife
• Methodius Limited
• Michael Page
• Microsoft Corporation
• Milestone Technologies, Inc.
• Mitie Group PLC
• Modis International Ltd
• Momentum Support

• Monarch Recruitment.
• Monart Spa
• Morgan McKinley
• Motor Distributors
• Mount Juliet
• Mount Wolseley Hotel Spa & Golf Resort
• Mowlam Healthcare
• Moyvalley Hotel & Golf Resort
• Mss Recruitment
• Muckross Park Hotel & Spa
• Murdock Builders’ Merchants Limited
• Murphy & Sons Limited
• Musgrave Group plc