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

Date of Report (Date of earliest event reported): June 24, 2013

CARMAX, INC.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (804) 747-0422

Not applicable

(Former name or former address, if changed since last report)

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:

As discussed under Item 5.07 of this Current Report on Form 8-K, on June 24, 2013, at the CarMax, Inc. (the “Company”) 2013 Annual Meeting of Shareholders, the Company’s shareholders, upon recommendation of the Company’s Board of Directors (the “Board”), approved amendments to the Company’s Articles of Incorporation, as amended and restated (the “Articles”). The approved amendments: (a) declassified the Board and provided for the annual election of all directors beginning with the Company’s 2014 Annual Meeting of Shareholders (the “Declassification Amendments”); and (b) updated and modified certain provisions related to the indemnification of the Company’s directors and officers.

In connection with the Declassification Amendments, the Board approved conforming amendments to Section 2.2 of the Company’s Bylaws, as amended and restated (the “Bylaws”), to remove references to the classified Board. The Board approved the amendments to the Bylaws subject to shareholder approval of the Declassification Amendments, effective June 24, 2013.

The foregoing descriptions of the amendments to the Articles and the Bylaws do not purport to be complete and are qualified in their entirety by reference to the full text of the Articles and the Bylaws, which are filed herewith as Exhibit 3.1 and Exhibit 3.2, respectively, and are incorporated by reference herein.

On June 24, 2013, the Company held its 2013 Annual Meeting of Shareholders. The following actions were taken:

1. The shareholders re-elected the following directors to the Board. The proposal stated that the term of the directors would expire at the 2014 Annual Meeting of Shareholders, if Proposal Four was approved, or at the 2016 Annual Meeting of Shareholders, if Proposal Four was not approved. Because Proposal Four was approved, the directors will each serve a one-year term expiring at the 2014 Annual Meeting of Shareholders.

There were 15,224,003 broker non-votes for each director.

2. The shareholders ratified the selection of KPMG LLP as the Company’s independent registered public accounting firm for fiscal year 2014 pursuant to the vote set forth below.

3. The shareholders approved the non-binding advisory resolution related to the compensation of our named executive officers pursuant to the vote set forth below.

There were 15,224,003 broker non-votes related to this vote.

4. The shareholders approved amendments to the CarMax, Inc. Articles of Incorporation to declassify the Company’s Board of Directors pursuant to the vote set forth below.

There were 15,224,003 broker non-votes related to this vote.

5. The shareholders approved amendments to the CarMax, Inc. Articles of Incorporation to update and modify certain provisions relating to indemnification pursuant to the vote set forth below.

There were 15,224,003 broker non-votes related to this vote.

SIGNATURES

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