factors, our future investment income may fall short of expectations due to changes in interest rates or if the decline in fair value of our publicly traded debt or equity investments is judged to be other-than-temporary. We may suffer losses in principal if we are forced to sell securities that decline in market value due to changes in interest rates. However, because any debt securities we hold are classified as “available-for-sale,” no gains or losses are realized in our statement of operations due to changes in interest rates unless such securities are sold prior to maturity or unless declines in market values are determined to be other-than-temporary.  These securities are reported at fair value with the related unrealized gains and losses included in accumulated other comprehensive income, a component of stockholders’ equity, net of tax.



      As of January 30, 2011 and January 31, 2010, we had $2.49 billion and $1.73 billion, respectively, in cash, cash equivalents and marketable securities.  Our investment policy requires the purchase of top-tier investment grade securities, the diversification of asset types and includes certain limits on our portfolio duration, as specified in our investment policy guidelines. These guidelines also limit the amount of credit exposure to any one issue, issuer or type of instrument. As of January 30, 2011, we were in compliance with our investment policy.  As of January 30, 2011, our investments in government agencies and government sponsored enterprises represented approximately 51% of our total investment portfolio, while the financial sector accounted for approximately 34% of our total investment portfolio. All of our investments are with A/A2 or better rated securities.



 We performed an impairment review of our investment portfolio as of January 30, 2011.  Based on our quarterly impairment review, we concluded that our investments were appropriately valued and did not record any impairment during fiscal year 2011.   During fiscal year 2009, we recorded other than temporary impairment charges of $9.9 million.. These charges included $5.6 million related to an other than temporary impairment of our investment in the money market funds held by the Reserve International Liquidity Fund, Ltd., or International Reserve Fund, $2.5 million related to a decline in the value of publicly traded equity securities, and $1.8 million related to debt securities held by us that were issued by companies that had filed for bankruptcy. In the fourth quarter of fiscal year 2011 we recovered $3.1 million of the other than temporary impairment charge previously recorded.  This was recorded as other income in fiscal year 2011.    Please refer to Note 18 of the Notes to the Consolidated Financial Statements in Part IV, Item 15 of this Form 10-K for further details.



Net realized gains, excluding any impairment charges, were $1.5 million, $1.8 million and $2.1 million for fiscal year 2011, 2010 and 2009 respectively.  As of January 30, 2011, we had a net unrealized gain of $10.5 million, which was comprised of gross unrealized gains of $11.0 million, offset by $0.5 million of gross unrealized losses.  As of January