Medallion Shield Performance by School Performance Table

| School | Titles | Shared_Titles | Runners_Up | Total_Finals | Last_Title | Last_Final |
|---|---|---|---|---|---|---|
| Methodist College Belfast | 35 | 3 | 19 | 57 | 2012 | 2012 |
| Royal Belfast Academical Institution | 32 | 3 | 15 | 50 | 2008 | 2008 |
| Coleraine Academical Institution | 8 | 1 | 12 | 21 | 2000 † | 2000 |
| Belfast Royal Academy | 4 | 2 | 10 | 16 | 1979 | 1994 |
| Campbell College | 3 | 1 | 4 | 8 | 2013 | 2013 |
| Royal School Dungannon | 3 | 0 | 10 | 13 | 1994 | 1994 |
| Regent House, Newtownards | 3 | 0 | 5 | 8 | 1998 | 2008 |
| Bangor Grammar School | 3 | 0 | 4 | 7 | 1985 | 1986 |
| Sullivan Upper School | 2 | 0 | 0 | 2 | 2011 | 2011 |
| Ballymena Academy | 1 | 2 | 4 | 7 | 1970 | 2006 |
| Rainey Endowed School | 1 | 0 | 2 | 3 | 1977 | 1993 |