ENDNOTES

1.		The end balances and business activity in this report represent unpaid principal balances (“UPB”), which do not reflect market valuation adjustments, allowance for loan losses, impairments, unamortized premiums and discounts and the impact of consolidation of variable interest entities. Amounts and rates shown for the periods after September 2007 reflect definitional changes and may, therefore, not be comparable to amounts and rates shown for prior periods. Please see notes 3, 5, 6, 8, and 10 and the Glossary below for more information about these changes.
2.		Includes capitalized interest.
3.		For October 2007, liquidations have been increased by $890 million, primarily to exclude from the end balance amounts that Fannie Mae now classifies as advances to lenders. The effect of this adjustment has been excluded in calculating growth and liquidation rates for October 2007.
4.		Includes Fannie Mae mortgage-backed securities (“Fannie Mae MBS”) issued from Fannie Mae’s mortgage portfolio. See Table 5 for monthly activity and balances for Fannie Mae MBS held in portfolio.
5.		For October 2007, “Total Fannie Mae MBS Liquidations” have been reduced by $3.2 billion, primarily to reflect Fannie Mae’ s reclassification of Ginnie Mae wraps from “Other Fannie Mae Guarantees” to “Fannie Mae MBS.” The effect of this adjustment has been excluded in calculating growth and liquidation rates for October 2007.
6.		For October 2007, “Mortgage Loans” has been reduced by $967 million primarily to exclude from the end balance advances to lenders, which were previously classified as loans.
7.		Represents new Fannie Mae MBS created from mortgage loans or non-Fannie Mae mortgage securities previously held in the mortgage portfolio. These amounts, included in the issuance balance in table 4, have been transferred from mortgage loans or non-Fannie Mae mortgage securities to Fannie Mae securities, and may be included in sales.
8.		Beginning with October 2007, “Liquid Investments” includes federal funds sold. Without this change, the end balance in October 2007 would have been $32.4 billion.
9.		Reported amounts represent the UPB at each reporting period or, in the case of the long-term zero coupon bonds, at maturity. UPB does not reflect the effect of debt basis adjustments, including discounts, premiums, and issuance costs.
10.		Beginning with October 2007, this report reflects current foreign exchange adjustments at the respective rates for the period. In addition, amounts after September 2007 reflect the reclassification of $2.2 billion from “Original Maturity < 1 Year” to “Original Maturity > 1 Year.” The $2.2 billion reclassification is reflected in “Foreign Exchange Adjustments” for October 2007. Also, beginning with October 2007, federal funds purchased are not included in “Original Maturity < 1 Year.” Federal funds purchased totaled $1.5 billion in October 2007.
11.		These measurements show the estimated loss in the pre-tax fair value of Fannie Mae’s assets and liabilities, including debt and derivatives, that would result from an immediate adverse change in the level of LIBOR rates and in the slope of the LIBOR yield curve. Fannie Mae shows this information in dollar amounts. Previously, these measurements were expressed as a percentage of the latest available after-tax fair value of Fannie Mae’s net assets, adjusted for capital transactions. Fannie Mae believes presenting this information in dollar amounts provides more useful information, because it makes it easier to see the amounts at risk. Changes in the after-tax fair value of our net assets resulting from Fannie Mae’s business activities and changes in market conditions caused fluctuations in these percentages that Fannie Mae believes were disproportionate to the changes in the amount at risk. For April 2008, under Fannie Mae’s prior presentation, the estimated average daily loss from an immediate adverse shift in rate level would have been 8% and from an immediate adverse shift in slope would have been 1%. The estimated loss from a rate level change, when expressed as a percentage, differs substantially from prior months because percentages for recent months are based on the after-tax fair value of Fannie Mae’s net assets as of September 30, 2007 or December 31, 2007, while the April 2008 percentage is based on the after-tax fair value of Fannie Mae’s assets as of March 31, 2008. For the period from June 2007 to December 2007, the estimated average daily loss from an immediate adverse rate level change was $0.5 billion and from an immediate adverse rate slope change was $0.1 billion.
12.		Beginning with June 2007, the effective duration gap is weighted based on the proportional fair value weightings of Fannie Mae’s assets and liabilities. In prior months, the duration gap was not calculated on a weighted basis.
13.		Includes conventional single-family loans three months or more past due or in foreclosure process as a percent of the total number of conventional single-family loans. These rates are based on conventional single-family mortgage loans and exclude reverse mortgages and non-Fannie Mae mortgage securities held in our portfolio.
14.		Loans without primary mortgage insurance and/or other credit enhancements.
15.		Loans with primary mortgage insurance and/or other credit enhancements.
16.		Total conventional single-family serious delinquency rate includes non-credit enhanced and credit enhanced loans.
17.		Includes multifamily loans and securities 60 days or more past due and is calculated based on the UPB of delinquent multifamily loans owned by Fannie Mae or underlying Fannie Mae guaranteed securities, divided by the UPB of multifamily loans owned by Fannie Mae or underlying Fannie Mae guaranteed securities.

GLOSSARY & OTHER INFORMATION

General

Risk Disclosures. In addition to the interest rate risk disclosures provided in Table 8, Fannie Mae’s most recent available information relating to subordinated debt, liquidity management, corporate risk ratings and credit risks is included in its most recent Form 10-K or Form 10-Q filed with the Securities and Exchange Commission.

Compounded Growth Rate. Monthly growth rates are compounded to provide an annualized rate of growth.

Table 1

Total Book of Business. Sum of the Gross Mortgage Portfolio balance and Total Fannie Mae MBS and Other Guarantees balance, less Fannie Mae MBS held in the mortgage portfolio.

New Business Acquisitions. Sum of MBS issuances and Mortgage Portfolio purchases less Fannie Mae MBS purchases and securitizations of mortgage loans previously held in portfolio.

Table 2

Portfolio Commitments. Represents mandatory commitments entered into during the month. Fannie Mae enters into forward commitments to purchase mortgage securities and mortgage loans, or to sell mortgage securities, for the mortgage portfolio. Purchase commitments typically require mandatory delivery and are subject to the payment of pair-off fees for non-delivery.

Commitments to Purchase, Net. Represents mandatory commitments to purchase mortgage loans and mortgage securities, net of mortgage loans for which a cash pair-off has been paid. Pair-offs occur when loans are not delivered against mandatory commitments.

Commitments to Sell. Represents mandatory commitments to sell mortgage securities.

Net Retained Commitments. Represents mandatory commitments to purchase, less commitments to sell, net of mortgage loans for which a cash pair-off has been paid.

Table 3

Gross Mortgage Portfolio. End balance represents the unpaid principal balance (“UPB”) of the mortgage portfolio that Fannie Mae holds for investment and liquidity purposes.

Purchases. Acquisition of mortgage loans and mortgage securities for the mortgage portfolio.

Sales. Sales of mortgage securities from the mortgage portfolio.

Liquidations. Represents the total amount of repayments, curtailments, payoffs, and foreclosures on mortgage loans and mortgages underlying securities held in the mortgage portfolio.

Annualized Liquidation Rate. The liquidation rate is calculated as liquidations divided by the prior period ending balance of the mortgage portfolio, annualized.

Table 4

Fannie Mae Guaranteed Securities and Mortgage Loans. Consists of securities and mortgage loans for which Fannie Mae manages credit risk. This table excludes non-Fannie Mae securities held in the mortgage portfolio, which are shown in Table 5.

Total Fannie Mae MBS. Includes Fannie Mae MBS, private label wraps, whole loan REMICs, and for periods after September 2007, Ginnie Mae wraps. Also includes Multifamily discount MBS (DMBS) that Fannie Mae guarantees, regardless of whether those MBS are held in the mortgage portfolio or held by investors other than Fannie Mae. If an MBS has been resecuritized into another MBS, the principal amount is only included once in this total.

Issuances. Represents the total amount of Fannie Mae MBS created during the month, including lender-originated issues and Fannie Mae MBS created from mortgage loans previously held in Fannie Mae’s portfolio. Fannie Mae MBS may be held in portfolio after their creation.

Liquidations. Represents the total amount of repayments, curtailments, payoffs, and foreclosures on mortgages underlying Fannie Mae MBS, including Fannie Mae MBS held in the mortgage portfolio.

Other Fannie Mae Guarantees. Outstanding balance of Fannie Mae guarantees, other than Fannie Mae MBS. This primarily consists of credit enhancements we provide on multifamily mortgage assets. Through September 2007, this also included Ginnie Mae wraps.

Annualized Liquidation Rate. The liquidation rate is calculated as liquidations divided by the prior period ending balance of total Fannie Mae MBS, annualized.

Table 5

Mortgage Portfolio Composition. Shows the primary components of Fannie Mae’s mortgage portfolio and activity relating to Fannie Mae MBS held in the mortgage portfolio.

Non-Fannie Mae Agency Securities. Represents mortgage-related securities issued by Freddie Mac and Ginnie Mae.

Non-Fannie Mae Non-Agency Securities. These are commonly referred to as “private-label securities.”

Table 6

Liquid Investments. Liquid investments serve as a source of liquidity for Fannie Mae and as an investment vehicle for surplus capital. This balance includes high-quality securities that are short-term or readily marketable, such as commercial paper, asset-backed securities, federal funds sold, and corporate floating rate notes. The balance shown includes cash equivalents but does not include cash balances or cash equivalents pledged as collateral that may be sold or repledged by the counterparty.

Table 7

Debt Activity. For more information about Fannie Mae’s debt activity, please visit www.fanniemae.com/markets/debt/debt_activity.

Table 8

Market Value Sensitivity to Rate Level Shock (50bp). This measurement shows the estimated loss in pre-tax market value of Fannie Mae’s assets and liabilities from an immediate adverse 50 basis point shift in the level of LIBOR rates. The amounts shown are estimates, not precise measurements. The measurement excludes any sensitivity of the guaranty business. Fannie Mae tracks the daily average of this measurement for the reported month.

Market Value Sensitivity to Rate Slope Shock (25bp). This measurement shows the estimated loss in pre-tax market value of Fannie Mae’s assets and liabilities from an immediate adverse 25 basis point change in the slope of the LIBOR yield curve. To calculate the “adverse” change in the slope of the LIBOR yield curve, the company calculates the effect of a 25 basis point change in slope that results in a steeper LIBOR yield curve and the effect of a 25 basis point change in slope that results in a flatter LIBOR yield curve, and reports the more adverse of the two results. The amounts shown are estimates, not precise measurements. The measurement excludes any sensitivity of the guaranty business. Fannie Mae tracks the daily average of this measurement for the reported month.

Effective Duration Gap. The effective duration gap estimates the net sensitivity of the fair value of Fannie Mae’s assets and liabilities to movements in interest rates. This statistic is expressed as a number of months, based on the daily average for the reported month. Beginning with June, the methodology has been updated such that a duration gap of zero implies that the change in the fair value of assets from an interest rate move will be offset by an equal move in the fair value of liabilities, including debt and derivatives, resulting in no change in the fair value of the net assets. The calculation excludes any sensitivity of the guaranty business.

Table 9

Serious Delinquency Rates. A measure of credit performance and indicator of future defaults for the single-family and multifamily mortgage credit books. We classify single-family loans as seriously delinquent when a borrower has missed three or more consecutive monthly payments, and the loan has not been brought current or extinguished through foreclosure, payoff, or other resolution. A loan referred to foreclosure but not yet foreclosed is also considered seriously delinquent. We include all of the conventional single-family loans that we own and that back Fannie Mae MBS in our single-family delinquency rate, including those with substantial credit enhancement. We classify multifamily loans as seriously delinquent when payment is 60 days or more past due.

For more information about Fannie Mae, please visit www. fanniemae.com or contact our Investor Relations Department at (202) 752-7115.