A bond portfolio model with interest rate swaps is developed to carry
out the mean-variance analysis. It is found that interest rate swaps c
an be used to reallocate non-marketable bonds in the portfolio by swap
ping out the non-traded fixed-rate bonds into LIBOR-based floating-rat
e notes. The optimal allocation of bond portfolios can be achieved fro
m the implicit reallocation of non-marketable bonds in the portfolios.