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Intangible asset amortization expense forwas $17.3 million and $17.7 million in the firstsecond quarter of 2011 and 2010, respectively, and was $17.4$34.7 million and $18.2$35.9 million in the first six months of 2011 and 2010, respectively. Annual amortization expense is estimated to be $65.3$66.3 million in 2011; $61.4 million in 2012; $57.9 million in 2013; $55.8 million in 2014; and $54.0 million in 2015.

Nucor has a 50% economic and voting interest in Duferdofin Nucor S.r.l., an Italian steel manufacturer. Nucor accounts for the investment in Duferdofin Nucor (on a one-month lag basis) under the equity method, as control and risk of loss are shared equally between the members.

Nucor’s investment in Duferdofin Nucor at AprilJuly 2, 2011 was $557.2$566.8 million ($531.9 million at December 31, 2010). Nucor’s 50% share of the total net assets of Duferdofin Nucor was $79.4 million at AprilJuly 2, 2011, resulting in a basis difference of $477.8$487.4 million due to the step-up to fair value of certain assets and liabilities attributable to Duferdofin Nucor as well as the identification of goodwill ($341.5349.9 million) and finite-lived intangible assets. This basis difference, excluding the portion attributable to goodwill, is being amortized based on the remaining estimated useful lives of the various underlying net assets, as appropriate. Amortization expense and other purchase accounting adjustments associated with the fair value step-up totaled $2.9was $3.2 million and $2.8 million in both the firstsecond quarter of 2011 and 2010.2010, respectively, and was $6.1 million and $5.7 million in the first six months of 2011 and 2010, respectively.

As of AprilJuly 2, 2011 Nucor had outstanding two notes receivable from Duferdofin Nucor with total value of €20 million ($28.3 million as of April 2, 2011)29.0 million). The notes receivable bear interest at the twelve-month Euro Interbank Offered Rate (Euribor) as of September 30, 2010 plus 1% per year. The interest rates will reset annually to the Euribor twelve-month rate plus 1% per year. The principal amounts are due on January 31, 2016. Accordingly, the notes receivable were classified in other assets in the condensed consolidated balance sheets as of AprilJuly 2, 2011.

Nucor has issued a guarantee for its ownership percentage (50%) of up to €112.5 million of Duferdofin Nucor’s credit facilities. As of AprilJuly 2, 2011, Duferdofin Nucor had €89.0€105.5 million outstanding under these credit facilities. The portion of the amount outstanding guaranteed by Nucor is €44.5€52.8 million ($62.976.4 million). Nucor has not recorded any liability associated with the guarantee.

In April 2010, Nucor acquired a 50% economic and voting interest in NuMit LLC. NuMit owns 100% of the equity interest in Steel Technologies LLC, an operator of 2425 sheet processing facilities located throughout the U.S., Canada and Mexico. Nucor accounts for the investment in NuMit (on a one-month lag basis) under the equity method as control and risk of loss are shared equally between the members. The acquisition did not result in a significant amount of goodwill or intangible assets.

Nucor’s investment in NuMit at AprilJuly 2, 2011 was $232.0$238.3 million ($229.1 million as of December 31, 2010), comprised of the purchase price of approximately $221.3 million plus equity method earnings since acquisition. Nucor also has recorded a $40.0 million note receivable from Steel Technologies LLC for a loan Nucor made at closing. In addition, Nucor has also extended a $97.5 million line of credit (of which $62.5$87.5 million was outstanding at AprilJuly 2, 2011) to Steel Technologies. The note receivable bears interest at the three-month London Interbank Offered Rate (LIBOR) plus 90 basis points and matures on October 21, 2014. As of AprilJuly 2, 2011, the amount outstanding on the line of credit bears interest at the one-month

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LIBOR rate plus 250 basis points and matures on April 1, 2012. The note receivable was classified in other assets and the amount outstanding on the line of credit was classified in other current assets in the condensed consolidated balance sheets.

Nucor reviews its equity investments for impairment if and when circumstances indicate that a decline in value below its carrying amount may have occurred. In the fourth quarter of 2010, the Company concluded it had a triggering event requiring assessment for impairment of its equity investment in Duferdofin Nucor due to the continued declinessignificant decline in the global demand for steel. Diminished demand began to significantly impact the financial results of Duferdofin Nucor in 2009

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and continued to impact the results of the equity investment through 2010. After completing its assessment, the Company determined that there was no impairment of its investment in Duferdofin Nucor. It is reasonably possible that, based on actual performance in the near term, the estimates used in the valuation as of December 31, 2010 could change and result in an impairment of the investment.

Nucor recognizes all derivative instruments in the condensed consolidated balance sheets at fair value. Any resulting changes in fair value are recorded as adjustments to other comprehensive income (loss), net of tax, or recognized in net earnings, as appropriate.

At AprilJuly 2, 2011, natural gas swaps covering 16.812.6 million MMBTUs (extending through December 2012) and foreign currency contracts with a notional value of $18.9$11.3 million (extending through JulyAugust 2011) were outstanding.

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The following tables summarize information regarding Nucor’s derivative instruments (in thousands):

Fair Values of Derivative Instruments

The Effect of Derivative Instruments on the Condensed Consolidated Statements of Earnings

Derivatives Designated as Hedging Instruments

Derivatives Not Designated as Hedging Instruments

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At AprilJuly 2, 2011, $35.8$36.6 million of net deferred losses on cash flow hedges on natural gas forward purchase contracts included in accumulated other comprehensive income are expected to be reclassified into earnings due toupon maturity of the settlement of forecasted transactions, duringderivatives within the next twelve12 months assuming no change inat the forward commodity pricesprevailing values, which may be different from Aprilthose at July 2, 2011.

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Fair value measurements for Nucor’s cash equivalents, short-term investments and restricted cash are classified under Level 1 because such measurements are based on quoted market prices in active markets for identical assets. Fair value measurements for Nucor’s derivatives are classified under Level 2 because such measurements are based on published market prices for similar assets or are estimated based on observable inputs such as interest rates, yield curves, credit risks, spot and future commodity prices, and spot and future exchange rates.

The fair value of outstandinglong-term debt, including current maturities, was approximately $4.55$4.59 billion at AprilJuly 2, 2011 ($4.59 billion at December 31, 2010). The fair value estimates were based on readily available market prices of our debt at AprilJuly 2, 2011 and December 31, 2010, or similar debt with the same maturities, rating and interest rates.

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Nucor has been named, along with other major steel producers, as a co-defendant in several related antitrust class-action complaints filed by Standard Iron Works and other steel purchasers in the United States District Court for the Northern District of Illinois. The cases are filed as class actions. The plaintiffs allege that from January 2005 to the present,through 2008, eight steel manufacturers, including Nucor, engaged in anticompetitive activities with respect to the production and sale of steel. The plaintiffs seek monetary and other relief. Although we believe the plaintiffs’ claims are without merit and will vigorously defend against them, we cannot at this time predict the outcome of this litigation or estimate the range of Nucor’s potential exposure.

Other contingent liabilities with respect to product warranties, legal proceedings and other matters arise in the normal course of business. Nucor maintains liability insurance for certain risks that arise that are also subject to certain self-insurance limits. InAlthough the opinionoutcome of the claims and proceedings against us cannot be predicted with certainty, management believes that there are no such matters exist which, in the event of an unfavorable outcome, wouldexisting claims or proceedings that are likely to have a material adverse effect on the consolidated financial statements.

A summary of activity under Nucor’s stock option plans for the quarter ended April 2,first six months of 2011 is as follows (in thousands, except year and per share amounts):

For the 2011 stock option grant, the grant date fair value of $15.37 per share was calculated using the Black-Scholes option-pricing model with the following assumptions:

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Compensation expense for stock options was $0.3$7.1 million in the second quarter of 2011 ($0.1 million in the second quarter of 2010) and $7.4 million in the first quartersix months of 2011 (none($0.1 million in the first quartersix months of 2010). As of AprilJuly 2, 2011, unrecognized compensation expense related to options was $2.7$4.3 million, which is expected to be recognized over 2.2a weighted-average period of 1.3 years. The amount of cash received from the exercise of stock options totaled $2.7$0.5 million and $3.2 million in the second quarter and first quarterhalf of 2011.2011, respectively.

Restricted Stock Units–: Nucor annually grants restricted stock units (“RSUs”) to key employees, officers and non-employee directors. The RSUs typically vest and are converted to common stock in three equal installments on each of the first three anniversaries of the grant date. A portion of the RSUs awarded to senior officers vest upon the officer’s retirement. Retirement, for purposes of vesting in these units only, means termination of employment with approval of the Compensation and Executive Development Committee of the Board of Directors after satisfying age and years of service requirements. RSUs granted to non-employee directors are fully vested on the grant date and are payable to the non-employee director in the form of common stock after the termination of the director’s service on the board of directors.

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RSUs granted to employees who are eligible for retirement on the date of grant orare expensed immediately, and RSUs granted to employees who will become retirement-eligible prior to the end of the vesting term are expensed over the period through which the employee will become retirement-eligible since these awards vest upon retirement from the Company. Compensation expense for RSUs granted to employees who are not retirement-eligible is recognized on a straight-line basis over the vesting period.

Cash dividend equivalents are paid to participants each quarter. Dividend equivalents paid on units expected to vest are recognized as a reduction in retained earnings.

The fair value of the RSUs is determined based on the closing stock price of Nucor’s common stock on the day before the grant.grant. A summary of Nucor’s restricted stock unit activity for the first quartersix months of 2011 is as follows (shares in thousands):

Compensation expense for RSUs was $7.5$12.2 million and $13.5 million in the second quarter of 2011 and 2010, respectively, and $19.7 million and $22.5 million in the first quarterhalf of 2011 ($9.0 million in the first quarter of 2010).and 2010, respectively. As of AprilJuly 2, 2011, unrecognized compensation expense related to unvested RSUs was $28.2$35.7 million, which is expected to be recognized over a weighted-average period of 1.41.9 years.

Restricted Stock Awards– Nucor’s Senior Officers Long-Term Incentive Plan (the “LTIP”) and Annual Incentive Plan (the “AIP”) authorize the award of shares of common stock to officers subject to certain conditions and restrictions.

The LTIP provides for the award of shares of restricted common stock at the end of each LTIP performance measurement period at no cost to officers if certain financial performance goals are met during the period. One-third of the LTIP restricted stock award vests upon each of the first three

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anniversaries of the award date or, if earlier, upon the officer’s attainment of age fifty-five while employed by Nucor. Although participants are entitled to cash dividends and may vote such awarded shares, the sale or transfer of such shares is limited during the restricted period.

The AIP provides for the payment of annual cash incentive awards. An AIP participant may elect, however, to defer payment of up to one-half of an annual incentive award. In such event, the deferred AIP award is converted into common stock units and credited with a deferral incentive, in the form of additional common stock units, equal to 25% of the number of common stock units attributable to the deferred AIP award. Common stock units attributable to deferred AIP awards are fully vested. Common stock units credited as a deferral incentive vest upon the AIP participant’s attainment of age fifty-five while employed by Nucor. Vested common stock units are paid to AIP participants in the form of shares of common stock following their termination of employment with Nucor.

A summary of Nucor’s restricted stock activity under the AIP and LTIP for the first quartersix months of 2011 is as follows (shares in thousands):

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