NUE 10-Q Quarter ended July 3, 2010

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF

THE SECURITIES EXCHANGE ACT OF 1934

For quarterly period ended July 3, 2010

Commission file number 1-4119

NUCOR CORPORATION

(Exact name of registrant as specified in its charter)

(704) 366-7000

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes x No ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for shorter period that the registrant was required to submit and post such files).    Yes x No ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer x Accelerated filer ¨ Non-accelerated filer ¨ Smaller reporting company ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes ¨ No x

315,560,705 shares of common stock were outstanding at July 3, 2010.

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Nucor Corporation

Form 10-Q

July 3, 2010

INDEX

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(In thousands, except per share amounts)

See notes to condensed consolidated financial statements.

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(In thousands)

See notes to condensed consolidated financial statements.

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(In thousands)

See notes to condensed consolidated financial statements.

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Nucor Corporation – Notes to Condensed Consolidated Financial Statements (Unaudited)

Recently Adopted Accounting Pronouncements - In January 2010, Nucor adopted accounting guidance regarding the consolidation of variable interest entities (“VIEs”). The new guidance requires a qualitative approach to identifying a controlling financial interest in a VIE, and requires ongoing reassessments of whether an entity is a VIE and whether an entity is the primary beneficiary of a VIE. Adoption of this accounting standard had no impact on Nucor’s consolidated financial statements.

In January 2010, Nucor adopted accounting guidance that requires an entity to disclose separately the amounts of significant transfers in and out of Level 1 and Level 2 fair value measurements and describe the reasons for the transfers. Adoption of this accounting standard did not have a material impact on Nucor’s consolidated financial statements.

Recently Issued Accounting Pronouncements - In January 2010, the Financial Accounting Standards Board issued changes to disclosure requirements for fair value measurements. For fair value measurements using significant unobservable inputs (Level 3), the changes require a reporting entity to present separate information about gross purchases, sales, issuances and settlements. These changes are effective for Nucor beginning January 2011. The adoption of this guidance is not expected to have an impact on the consolidated financial statements.

Inventories valued using the last-in, first-out (LIFO) method of accounting represent approximately 51% of total inventories as of July 3, 2010 (48% as of December 31, 2009). If the first-in, first-out (FIFO) method of accounting had been used, inventories would have been $547.4 million higher at July 3, 2010 ($456.4 million higher at December 31, 2009). Use of the lower of cost or market method reduced inventories by $5.8 million at July 3, 2010 ($9.2 million at December 31, 2009).

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Nucor Corporation – Notes to Condensed Consolidated Financial Statements (Unaudited) —(Continued)

Nucor completed its annual goodwill impairment testing during the fourth quarter of 2009 and concluded that there was no impairment of goodwill for any of our reporting units. The annual evaluation performed in 2009 used forward-looking projections and included significant expected improvements in the future cash flows of two of Nucor’s reporting units, Buildings Group and Steel Trading. As a result of the global economic recession, operating results of each of these reporting units declined significantly in the fourth quarter of 2008 and remained depressed through the second quarter of 2010. Nucor expects operating results of these two units to improve when general economic conditions improve. If Nucor’s assessment of the relevant facts and circumstances changes, economic conditions fail to improve, or actual performance in any of these or other reporting units falls short of expected results, noncash impairment charges may be required. Total goodwill associated with the Buildings Group and Steel Trading reporting units as of July 3, 2010 were $165.3 million and $88.9 million, respectively. An impairment of goodwill may also lead Nucor to record an impairment of other intangible assets. Total finite-lived intangible assets associated with the Buildings Group and Steel Trading reporting units as of July 3, 2010 were $88.5 million and $13.2 million, respectively.

Intangible assets with estimated lives of five to 22 years are amortized on a straight-line or accelerated basis and are comprised of the following (in thousands):

Intangible asset amortization expense was $17.7 million and $17.9 million in the second quarter of 2010 and 2009, respectively, and was $35.9 million and $36.0 million in the first six months of 2010 and 2009, respectively. Annual amortization expense is estimated to be $69.0 million in 2010; $64.4 million in 2011; $61.4 million in 2012; $57.9 million in 2013; and $55.8 million in 2014.

In 2008, Nucor acquired 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 July 3, 2010 was $503.8 million ($534.0 million at December 31, 2009). Nucor’s 50% share of the total net assets of Duferdofin Nucor was $74.1 million at July 3, 2010, resulting in a basis difference of $429.7 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 ($303.0 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. Nucor’s 50% share of amortization expense and other purchase accounting adjustments associated with the fair value step-up was $2.8 million and $3.1 million in the second quarter of 2010 and 2009, respectively, and was $5.7 million and $9.3 million in the first six months of 2010 and 2009, respectively.

During the first quarter of 2010, Duferdofin Nucor repaid €35 million ($48.9 million as of the payment date) of notes receivable that were outstanding with Nucor as of December 31, 2009. Nucor then contributed additional capital in the form of equity of €45 million ($63.7 million as of the contribution date) to the joint venture. Also, Nucor recorded an additional note receivable from Duferdofin Nucor with a notional value of €10 million ($12.5 million as of July 3, 2010). The note receivable bears interest at the

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Nucor Corporation – Notes to Condensed Consolidated Financial Statements (Unaudited) —(Continued)

twelve-month Euro Interbank Offered Rate (Euribor) as of the date of the note plus 1% per year. The interest rate will reset on September 30, 2010 to the Euribor twelve month rate as of that date plus 1% per year. The principal amount is due on January 31, 2016. Accordingly, the note receivable was classified in other assets in the condensed consolidated balance sheets as of July 3, 2010.

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 23 sheet processing facilities 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 and intangible assets.

Nucor’s investment in NuMit at July 3, 2010 was $223.1 million, 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 made at closing and has extended a $60.0 million line of credit (of which $59.0 million was outstanding at July 3, 2010) to Steel Technologies. The note receivable bears interest at the three month London Interbank Offered Rate (LIBOR) plus 90 basis points, and it matures on October 21, 2014. As of July 3, 2010, the line of credit bears interest at the one month LIBOR rate plus 70 basis points, and it matures on March 31, 2011. The note receivable was classified in other assets and the line of credit was classified in other current assets in the condensed consolidated balance sheets as of July 3, 2010.

Nucor reviews its equity investments for impairment if and when circumstances indicate a potential loss in value of an investment that is an other than temporary decline. In the fourth quarter of 2009, the Company concluded it had a triggering event requiring assessment for impairment of its equity investment in Duferdofin Nucor due to the significant decline in the global demand for steel, which has significantly impacted the financial results of the equity investment. Based on the results of the impairment analysis, the Company determined that the estimated fair value of our investment in Duferdofin Nucor approximated the carrying value as of December 31, 2009. Nucor determines the estimated fair value of our investment in Duferdofin Nucor using a discounted cash flow model, based on a weighted-average of multiple discounted cash flow scenarios. The assumptions that most significantly affect the fair value determination include projected revenues and the discount rate. The Company will continue to monitor trends in the global demand for steel, specifically within the European and North African markets in which Duferdofin Nucor operates. It is reasonably possible that the estimates used in our valuation as of December 31, 2009 could change based on actual performance and result in a determination that there is an other than temporary impairment of our investment. No such changes have occurred as of July 3, 2010.

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 July 3, 2010, natural gas swaps covering 17.7 million MMBTUs (extending through December 2012) and foreign currency contracts with a notional value of $7.7 million (extending through August 2010) were outstanding.

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Nucor Corporation – Notes to Condensed Consolidated Financial Statements (Unaudited) —(Continued)

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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Nucor Corporation – Notes to Condensed Consolidated Financial Statements (Unaudited) —(Continued)

Fair value measurements for Nucor’s cash equivalents and short-term investments 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 long-term debt, including current maturities, was approximately $3.39 billion at July 3, 2010 ($3.30 billion at December 31, 2009). The fair value estimates were based on readily available market prices of our debt at July 3, 2010 and December 31, 2009, or similar debt with the same maturities, rating and interest rates.

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Nucor Corporation – Notes to Condensed Consolidated Financial Statements (Unaudited) —(Continued)

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, 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 determine Nucor’s potential exposure.

Other contingent liabilities with respect to product warranties, legal proceedings and other matters arise in the normal course of business. In the opinion of management, no such matters exist which, in the event of an unfavorable outcome, would have a material effect on the consolidated financial statements.

For the 2010 stock option grant, the grant date fair value of $15.50 was calculated using the Black-Scholes option-pricing model with the following assumptions:

Compensation expense for stock options was $0.1 million in the second quarter and first six months of 2010 (none in 2009). As of July 3, 2010, unrecognized compensation expense related to options was $3.6 million, which is expected to be recognized over 2.9 years. The amount of cash received from the exercise of stock options totaled $0.3 million and $1.8 million in the second quarter and first half of 2010, respectively.

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Nucor Corporation – Notes to Condensed Consolidated Financial Statements (Unaudited) —(Continued)

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 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.

RSUs granted to employees who are eligible for retirement on the date of grant or 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 the 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. A summary of Nucor’s restricted stock unit activity for the first six months of 2010 is as follows (shares in thousands):

Compensation expense for RSUs was $13.5 million and $19.5 million in the second quarter of 2010 and 2009, respectively, and $22.5 million and $28.3 million in the first half of 2010 and 2009, respectively. As of July 3, 2010, unrecognized compensation expense related to unvested RSUs was $49.4 million, which is expected to be recognized over a weighted-average period of 2.1 years.

Restricted Stock Awards – Nucor’s Senior Officers Annual Incentive Plan (the “AIP”) and Long-Term Incentive Plan (the “LTIP”) 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 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

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Nucor Corporation – Notes to Condensed Consolidated Financial Statements (Unaudited) —(Continued)

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 six months of 2010 is as follows (shares in thousands):

Compensation expense for common stock and common stock units awarded under the AIP and LTIP is recorded over the performance measurement and vesting periods based on the anticipated number and market value of shares of common stock and common stock units to be awarded. Compensation expense for anticipated awards based upon Nucor’s financial performance, exclusive of amounts payable in cash, was $1.1 million and $1.9 million in the second quarter of 2010 and 2009, respectively, and was $2.5 million and $3.3 million in the first half of 2010 and 2009, respectively. At July 3, 2010, unrecognized compensation expense related to unvested restricted stock was $2.6 million, which is expected to be recognized over a weighted-average period of 1.6 years.

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Nucor Corporation – Notes to Condensed Consolidated Financial Statements (Unaudited) —(Continued)