Weighted Average Maturity (WAM)

Alternative Investments Home Ownership Mortgage Financial Terms Dictionary

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Weighted average maturity (WAM) is a measure of the total maturity of mortgages bundled into mortgage-backed securities (MBS).

A longer WAM carries a slightly higher interest rate and credit risk than an MBS with a shorter WAM.
WAM is the inverse of another popular measure of MBS duration: Weighted Average Loan Term (WALA).