UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

March 4, 2016

(Date of earliest event reported)

QUANEX BUILDING PRODUCTS CORPORATION

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: 713-961-4600

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:

On March 7, 2016, Quanex Building Products Corporation (the “Registrant”) issued a press release announcing its results of operations and financial condition for the fiscal quarter ended January 31, 2016. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Amendments to Certificate of Incorporation

As disclosed on the Registrant’s Current Report on Form 8-K as filed with the Securities and Exchange Commission on October 28, 2015, the Registrant’s Board of Directors (the “Board”) previously approved certain amendments to the Registrant’s Certificate of Incorporation (the “Charter”), subject to the approval by the Registrant’s stockholders (the “Stockholders”) at the Registrant’s annual meeting of Stockholders in 2016. The Stockholders approved the proposed Charter amendments on March 4, 2016, as discussed in Item 5.07 below. The Charter amendments approved by the Board, and subsequently approved by the Stockholders, are as follows:

The Charter amendments approved by the Stockholders were made effective by filing with the Secretary of State of the State of Delaware on March 4, 2016. The foregoing discussion of amendments to the Charter is qualified in its entirety by reference to the full text of the Restated Charter of the Registrant, which is attached to this Current Report on Form 8-K as Exhibit 3.1 and incorporated by reference herein.

Amendments to Bylaws

In connection with the foregoing Charter amendments, the Board also approved, contingent on Stockholder approval of the applicable Charter amendments, certain other related and/or conforming amendments to the Registrant’s Second Amended and Restated Bylaws (the “Bylaws”), including an amendment to Section 4.4 of the Bylaws to provide that (i) until the Board is fully declassified, directors shall be subject to removal for cause only by majority vote of stockholders and (ii) following the time the Board is fully declassified, annually elected directors shall be removable with or without cause by 66 2/3% of the voting power of the outstanding shares of capital stock. Concurrent with Stockholder approval of the Charter amendments noted above, these contingent Bylaw amendments were automatically enacted.

The foregoing discussion of amendments to the Bylaws is qualified in its entirety by reference to the full text of the Third Amended and Restated Bylaws of the Registrant, which is attached to this Current Report on Form 8-K as Exhibit 3.2 and incorporated by reference herein.

On March 4, 2016, the Company held its Annual Meeting of Stockholders, pursuant to notice and proxy mailed on January 29, 2016, to the Company’s stockholders of record as of January 14, 2016. There were 34,208,012 shares of common stock entitled to vote at the meeting, and a total of 32,128,071 shares were represented at the meeting in person or by proxy.

At the Annual Meeting, two directors were elected for terms expiring at the Company’s 2019 Annual Meeting, with the following tabulation of votes for each nominee:

In addition to the election of directors, stockholders at the Annual Meeting took the following actions:

The tabulation of votes for each of these proposals is set forth below:

On March 7, 2016, the Registrant issued a press release announcing that the Board had declared a quarterly cash dividend of $0.04 per share of common stock, payable on March 31, 2016, to Stockholders of record on March 18, 2016. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated herein by reference.

(d) Exhibits

SIGNATURE

Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Exhibit Index