| Class | Semester | Year | Brothers |
|---|---|---|---|
| Founding Fathers | Fall | 1987 | 30 |
| Alpha | Fall | 1988 | 4 |
| Beta | Spring | 1989 | 1 |
| Gamma | Fall | 1989 | 21 |
| Delta | Spring | 1990 | 4 |
| Epsilon | Fall | 1990 | 9 |
| Zeta | Spring | 1991 | 2 |
| Eta | Fall | 1991 | 9 |
| Theta | Spring | 1992 | 2 |
| Iota | Fall | 1992 | 11 |
| Kappa | Spring | 1993 | 1 |
| Lambda | Fall | 1993 | 12 |
| Mu | Spring | 1994 | 4 |
| Nu | Fall | 1994 | 7 |
| Xi | Spring | 1995 | 4 |
| Omicron | Fall | 1995 | 3 |
| Pi | Spring | 1996 | 1 |
| Rho | Fall | 1996 | 0 |
| Sigma | Spring | 1997 | 2 |
| Tau | Fall | 1997 | 5 |
| Upsilon | Spring | 1998 | 3 |
| Phi | Fall | 1998 | 1 |
| Chi | Spring | 1999 | 7 |
| Psi | Fall | 1999 | 8 |
| Omega | Spring | 2000 | 4 |
| Alpha Alpha | Fall | 2000 | 1 |
| Alpha Beta | Spring | 2001 | 3 |
| Alpha Gamma | Fall | 2001 | 15 |
| Alpha Delta | Spring | 2002 | 6 |
| Alpha Epsilon | Fall | 2004 | 10 |
| Alpha Zeta | Spring | 2005 | 3 |
| Alpha Theta | Fall (2nd) | 2005 | 3 |
| Alpha Eta | Fall | 2005 | 5 |
| Alpha Iota | Spring | 2006 | 7 |
| Alpha Kappa | Fall | 2006 | 5 |
| Alpha Lambda | Spring | 2007 | 0 |
| Alpha Mu | Fall | 2007 | 0 |
| Alpha Nu | Spring | 2008 | 0 |
| Alpha Xi | Fall | 2008 | 6 |
| Alpha Omicron | Spring | 2009 | 3 |
| Alpha Pi | Fall | 2009 | 5 |
| Alpha Rho | Spring | 2010 | 0 |
| Alpha Sigma | Fall | 2010 | 14 |
| Alpha Tau | Spring | 2011 | 12 |
| Alpha Upsilon | Fall | 2011 | 0 |
| Alpha Phi | Spring | 2012 | 0 |
| Alpha Chi | Fall | 2012 | 0 |
| Alpha Psi | Spring | 2013 | 0 |
| Alpha Omega | Fall | 2013 | 1 |