A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | 1
| Manpower (21) | Manpower UK Limited (22) |
| Marks Sattin (11) | Marsh (5) |
| MasterCard (5) | MATRIX RECRUITMENT (9) |
| MC DONALD'S Deutschland (5) | McAfee (47) |
| McDonald's Deutschland (14) | MCGINLEY HUMAN RESOURCES LIMITED (6) |
| Meath Local Authorities (6) | MELALEUCA (5) |
| Mentor Graphics (6) | Merck (56) |
| Merck/MSD (27) | Microsoft (91) |
| Microsoft Ireland (10) | Misys (12) |
| Morgan McKinley (82) | Mylan Pharmaceuticals (6) |