UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM 8-K

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CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of report (Date of earliest event reported): February 17, 2014

NUCOR CORPORATION

(Exact Name of Registrant as Specified in its Charter)

Delaware

(State or Other Jurisdiction of Incorporation)

Registrant’s telephone number, including area code: (704) 366-7000

N/A

(Former Name or Former Address, if Changed Since Last Report.)

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Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Item 5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

(d) On February 17, 2014, the Board of Directors of Nucor Corporation (the “Corporation”) elected Gregory J. Hayes, Senior Vice President and Chief Financial Officer of United Technologies Corporation, to the Corporation’s Board as a director, effective that day, with a term expiring at the Corporation’s 2014 annual meeting of stockholders. Concurrent with his election as a director, Mr. Hayes was appointed to the Audit Committee, the Compensation and Executive Development Committee and the Governance and Nominating Committee of the Board of Directors. There are no arrangements or understandings between Mr. Hayes and any other persons pursuant to which he was selected as a director. There are no transactions involving the Corporation and Mr. Hayes that the Corporation would be required to report pursuant to Item 404(a) of Regulation S-K. Mr. Hayes has never served as one of the Corporation’s officers or employees, and none of the Corporation’s executive officers has served or serves as a director or member of the compensation committee (or other committee performing similar functions) of United Technologies.

Mr. Hayes will receive compensation in accordance with the Corporation’s standard compensation arrangements for non-employee directors, which are described under the caption “Director Compensation” in the Corporation’s definitive proxy statement on Schedule 14A filed with the Securities and Exchange Commission on March 27, 2013, as adjusted by the Board of Directors from time to time.

A copy of the news release announcing Mr. Hayes’ election is furnished as Exhibit 99.1 and incorporated herein by reference.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

INDEX TO EXHIBITS