|FEDERAL NATIONAL MORTGAGE ASSOCIATION FANNIE MAE filed this Form 10-Q on 05/06/2011|
asset-backed securities. See Liquidity and Capital ManagementLiquidity ManagementCash and Other Investments Portfolio for more detailed information on our cash and other investments portfolio. Our counterparty risk is primarily with financial institutions and Treasury.
Our cash and other investments portfolio, which totaled $79.6 billion as of March 31, 2011, included $32.5 billion of U.S. Treasury securities and $10.8 billion of unsecured positions. All of our unsecured positions were short-term deposits with financial institutions that had short-term credit ratings of A-1, P-1, F1 (or its equivalent) or higher from Standard & Poors, Moodys and Fitch ratings, respectively. As of December 31, 2010, our cash and other investments portfolio totaled $61.8 billion and included $31.5 billion of U.S. Treasury securities and $10.3 billion of unsecured positions. All of our unsecured positions were short-term deposits with financial institutions which had short-term credit ratings of A-1, P-1, F1 (or equivalent) or higher from Standard & Poors, Moodys and Fitch ratings, respectively.
Our derivative credit exposure relates principally to interest rate and foreign currency derivatives contracts. We estimate our exposure to credit loss on derivative instruments by calculating the replacement cost, on a present value basis, to settle at current market prices all outstanding derivative contracts in a net gain position by counterparty where the right of legal offset exists, such as master netting agreements, and by transaction where the right of legal offset does not exist. Derivatives in a gain position are included in our condensed consolidated balance sheets in Other assets. We manage our exposure to derivatives counterparties by requiring collateral in specified instances.
Our net credit exposure on derivatives contracts decreased to $104 million as of March 31, 2011, from $152 million as of December 31, 2010. We had outstanding interest rate and foreign currency derivative transactions with 15 counterparties as of March 31, 2011 and December 31, 2010. Derivatives transactions with nine of our counterparties accounted for approximately 91% of our total outstanding notional amount as of March 31, 2011, with each of these counterparties accounting for between approximately 5% and 16% of the total outstanding notional amount. In addition to the 15 counterparties with whom we had outstanding notional amounts as of March 31, 2011, we had a master netting agreement with one more counterparty with whom we may enter into interest rate derivative or foreign currency derivative transactions in the future.
See Note 9, Derivative Instruments for information on the outstanding notional amount and additional information on our risk management derivative contracts as of March 31, 2011 and December 31, 2010. See Risk Factors in our 2010 Form 10-K for a discussion of the risks to our business posed by interest rate risk and a discussion of the risks to our business as a result of the increasing concentration of our derivatives counterparties.
Market Risk Management, Including Interest Rate Risk Management
We are subject to market risk, which includes interest rate risk, spread risk and liquidity risk. These risks arise from our mortgage asset investments. Interest rate risk is the risk of loss in value or expected future earnings that may result from changes to interest rates. Spread risk is the resulting impact of changes in the spread between our mortgage assets and our debt and derivatives we use to hedge our position. Liquidity risk is the risk that we will not be able to meet our funding obligations in a timely manner. We describe our sources of interest rate risk exposure and our strategy for managing interest rate risk and spread risk in MD&ARisk ManagementMarket Risk Management, Including Interest Rate Risk Management in our 2010 Form 10-K.
Measurement of Interest Rate Risk
Below we present two quantitative metrics that provide estimates of our interest rate exposure: (1) fair value sensitivity of net portfolio to changes in interest rate levels and slope of yield curve; and (2) duration gap. The metrics presented are calculated using internal models that require standard assumptions regarding interest rates and future prepayments of principal over the remaining life of our securities. These assumptions are derived based on the characteristics of the underlying structure of the securities and historical prepayment rates experienced at specified interest rate levels, taking into account current market conditions, the current