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| MAYORSTONE DISTRICT CREDIT UNION LIMITED | LIMERICK | MDCNIE21 |
| MBNA INTERNATIONAL BANK LTD | DUBLIN | MBITIE21 |
| MEATH STREET CREDIT UNION LIMITED | DUBLIN | MSCUIE21 |
| MEDIOLANUM ASSET MANAGEMENT LIMITED | BALLSBRIDGE | MEATIE2R |
| MEDIOLANUM ASSET MANAGEMENT LIMITED | DUBLIN | MEATIE21 |
| MELLIFONT CREDIT UNION LIMITED | DROGHEDA | METUIE21 |
| MEMBER FIRST CREDIT UNION LIMITED | DUBLIN | CLDIIE21 |
| MENLOUGH/SKEHANA CREDIT UNION LIMITED | BALLINASLOE | MEENIE21 |
| MERRION STOCKBROKERS | DUBLIN | METTIE21 |
| MERRION STOCKBROKERS LIMITED | DUBLIN | MESBIE21CTM |
| MERRION STOCKBROKERS LIMITED | DUBLIN | MESBIE21PCS |
| MERRION STOCKBROKERS LIMITED | DUBLIN | MESBIE21 |
| METZLER IRELAND LIMITED | DUBLIN | MIRLIE2ASFX |
| METZLER IRELAND LIMITED | DUBLIN | MIRLIE2A |
| MIDLETON CREDIT UNION LIMITED | MIDLETON | MIRNIE21 |
| MILLSTREET PARISH CREDIT UNION LIMITED | MILLSTREET | MPCNIE21 |
| MILLTOWN (KERRY) CREDIT UNION LIMITED | MILLTOWN | MKCUIE21 |
| MILLTOWN/CLONSKEA CREDIT UNION LIMITED | DUBLIN | MIRUIE21 |
| MITCHELSTOWN CREDIT UNION LIMITED | MITCHELSTOWN | MIEUIE21 |
| MITSUBISHI TRUST FINANCE (IRELAND) PLC | DUBLIN | MFIIIE21 |
| MMI STOCKBROKERS LTD. | DUBLIN | MMIBIE21 |
| MOHILL CREDIT UNION LIMITED | MOHIL | MOEUIE21 |
| MONAGHAN CREDIT UNION LIMITED | TIRKEENAN | MODIIE21 |
| MONALEEN PARISH CREDIT UNION LIMITED | CASTLETROY | MPRUIE21 |
| MONASTERBOICE CREDIT UNION LIMITED | DROGHEDA | MORNIE21 |
| MONASTEREVAN CREDIT UNION LIMITED | MONASTEREVAN | MOEIIE21 |
| MONTE PASCHI IRELAND LTD | DUBLIN | MPILIE21 |
| MORGAN GRENFELL FUND ADMINISTRATION SERVICES (IRELAND) LTD | DUBLIN | MGFAIE21 |
| MOUNTMELLICK CREDIT UNION LIMITED | MOUNTMELLICK | MOEOIE21 |
| MOUNTRATH AND DISTRICT CREDIT UNION LIMITED | MOUNTRATH | MDRUIE21 |