There are different methods to calculate default probability of a portfolio. One can name Structural method of Merton, Reduced (non-structural) form, Scoring method and Hybrid model. Although, finding default probability is really important and can help lenders to protect themselves, calculating default correlation between exposures is as critical. Calculation of default correlation enables financial institutions to take into account the effect of diversification and also, gives them a better estimate of overall defaults. The goal of this research is to find the correlation between default risks of publicly traded Canadian companies in an overall loan portfolio. For this purpose, the CreditMetrics method that was described by J.P. Morgan is utilized.