Weighted Average Maturity - WAM


DEFINITION of 'Weighted Average Maturity - WAM'

The weighted average of the time until all maturities on mortgages in a mortgage-backed security (MBS). The higher the weighted average to maturity, the longer the mortgages in the security have until maturity. Also known as "average effective maturity".

BREAKING DOWN 'Weighted Average Maturity - WAM'

The measure is calculated by totaling each mortgage value represented by the MBS. The weights of each mortgage is found by dividing the value of each into the total of all. To arrive at the WAM number the weight of each security is multiplied by the time until maturity of each mortgage, and then all the values are added together. For example say an MBS has three mortgages valued at $1,000, $2,000 and $3,000 (a total of $6,000) and mature in one, two and three years respectively. The weights of these are 1/6 (1,000/6,000), 1/3 (2,000/6,000) and 1/2 (3,000/6,000). The WAM is 2 1/3 years (1/6 x 1 year + 1/3 x 2 years + 1/2 x 3 years).

  1. Mortgage

    A debt instrument, secured by the collateral of specified real ...
  2. Weighted Average Remaining Term ...

    The remaining life of an asset-backed security or a mortgage-backed ...
  3. Commercial Mortgage-Backed Securities ...

    A type of mortgage-backed security that is secured by the loan ...
  4. Dwarf

    A slang term used to describe a pool of mortgage backed securities ...
  5. Mortgage-Backed Security (MBS)

    A type of asset-backed security that is secured by a mortgage ...
  6. Pass-Through Security

    A pool of fixed-income securities backed by a package of assets. ...
Related Articles
  1. Mutual Funds & ETFs

    ETF Analysis: iShares Cali AMT-Free Muni Bond

    Learn more about the iShares California AMT-Free Municipal Bond exchange-traded fund, a popular tax-advantaged ETF that dominates its category.
  2. Mutual Funds & ETFs

    ETF Analysis: iShares JPMorgan USD Emerg Markets Bond

    Learn about the iShares JPMorgan USD Emerging Markets Bond fund, which invests in bonds of sovereign and quasi-sovereign entities from emerging markets.
  3. Mutual Funds & ETFs

    Top 4 European Bonds ETFs

    Learn about the top exchange-traded funds (ETFs) that invest primarily in treasury and corporate bonds issued by European governments and companies.
  4. Mutual Funds & ETFs

    The Top 4 ETFs For Investing in US Government Bonds

    Discover the top four ETFs that invest in U.S. government bonds with maturities ranging from zero to 25 years, including nominal and inflation-protected bonds.
  5. Credit & Loans

    Understanding The Mortgage Payment Structure

    We explain the calculation and payment process as well as the amortization schedule of home loans.
  6. Mutual Funds & ETFs

    Top 4 Asia-Pacific ETFs

    Learn about four of the best-performing exchange-traded funds, or ETFs, that offer investors exposure to the Asia-Pacific region.
  7. Mutual Funds & ETFs

    Top 3 Muni California Mutual Funds

    Discover analyses of the top three California municipal bond mutual funds, and learn about their characteristics, historical performance and suitability.
  8. Investing

    Have Commodities Bottomed?

    Commodity prices have been heading lower for more than four years, being the worst performing asset class of 2015 with more losses in cyclical commodities.
  9. Professionals

    How Brokers are Candy-Coating Alternatives

    Alternatives have become a sexy choice for many advisors. But they also come with additional risks that are not always clearly spelled out to clients.
  10. Mutual Funds & ETFs

    Top 4 Investment Grade Corporate Bonds ETFs

    Discover detailed analysis and information about some of the top exchange-traded funds (ETFs) that offer exposure to the investment-grade corporate bond market.
  1. Are high yield bonds a good investment?

    Bonds are rated according to their risk of default by independent credit rating agencies such as Moody's, Standard & ... Read Full Answer >>
  2. Where do penny stocks trade?

    Generally, penny stocks are traded through the use of the Over the Counter Bulletin Board (OTCBB) and through pink sheets. ... Read Full Answer >>
  3. Where can I buy penny stocks?

    Some penny stocks, those using the definition of trading for less than $5 per share, are traded on regular exchanges such ... Read Full Answer >>
  4. What are the maximum Social Security disability benefits?

    The maximum Social Security disability benefit amount for a single eligible person in 2015 is $1,165 per month, but you can ... Read Full Answer >>
  5. What is the relationship between the current yield and risk?

    The general relationship between current yield and risk is that they increase in correlation to one another. A higher current ... Read Full Answer >>
  6. How are American Depository Receipts (ADRs) priced?

    The price of an American depositary receipt (ADR) is determined by the bank or other financial institution that issues it. ... Read Full Answer >>

You May Also Like

Hot Definitions
  1. Zero-Sum Game

    A situation in which one person’s gain is equivalent to another’s loss, so that the net change in wealth or benefit is zero. ...
  2. Capitalization Rate

    The rate of return on a real estate investment property based on the income that the property is expected to generate.
  3. Gross Profit

    A company's total revenue (equivalent to total sales) minus the cost of goods sold. Gross profit is the profit a company ...
  4. Revenue

    The amount of money that a company actually receives during a specific period, including discounts and deductions for returned ...
  5. Normal Profit

    An economic condition occurring when the difference between a firm’s total revenue and total cost is equal to zero.
  6. Operating Cost

    Expenses associated with the maintenance and administration of a business on a day-to-day basis.
Trading Center
You are using adblocking software

Want access to all of Investopedia? Add us to your “whitelist”
so you'll never miss a feature!