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 29, 2015 (June 25, 2015)

SLM CORPORATION

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (302) 451-0200

(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:

On June 25, 2015, the stockholders of SLM Corporation (the “Company”) approved an amendment to the Company’s Amended and Restated By-Laws adopting a proxy access provision. Specifically, the new Section 9 of Article II of the Amended and Restated By-Laws permits any stockholder, or group of no more than 20 stockholders, owning 3 percent or more of the Company’s outstanding common stock continuously for at least the previous three years, and who complies with other requirements set forth in Section 9 of Article II, to include one director nominee in the Company’s proxy statement for its annual meeting of stockholders, with the maximum number of stockholder-nominated candidates not to exceed 25 percent of the number of seats on the Board of Directors to be filled in the annual election.

One June 25, 2015, the Board of Directors of the Company approved an amendment to the advance notice window provision in Section 8 of Article II of the By-Laws for director nominations and other business to not earlier than the close of business on the 120th day nor later than the close of business on the 90th day prior to the anniversary date of the immediately preceding annual meeting of stockholders. Section 8 of Article II of the By-Laws previously provided for an advance notice window of between 120 days and 60 days prior to the anniversary date of the immediately preceding annual meeting of stockholders. This amendment, related to the aforementioned proxy access provision, was previously described to our stockholders in the proxy access proposal set forth in the Company’s definitive proxy statement dated May 5, 2015.

The foregoing brief descriptions of the amendments to the Company’s By-Laws are qualified in their entirety by the full text of the Company’s By-Laws, as amended and restated, a copy of which is being filed as Exhibit 3.2 hereto and incorporated herein by reference.

On June 25, 2015, the Company held its Annual Meeting of Stockholders (the “Annual Meeting”). As of the close of business on April 27, 2015, the record date for the Annual Meeting, 425,684,479 shares of common stock, par value $.20 per share, were outstanding and entitled to vote. At the Annual Meeting, 409,528,727, or approximately 96.20%, of the outstanding shares of common stock entitled to vote were represented in person or by proxy. At the Annual Meeting, the following proposals were submitted to a vote of the Company’s stockholders, with the voting results indicated below:

Proposal 1 – Election of Directors. The Company’s stockholders elected the following 12 directors to hold office until the 2016 Annual Meeting of Stockholders and until their successors have been duly elected or appointed.

Proposal 2 – Advisory Vote on Executive Compensation. The Company’s stockholders approved, by an advisory vote, the compensation of its named executive officers.

Proposal 3 – Ratification of the Appointment of KPMG LLP. The Company’s stockholders ratified the appointment of KPMG LLP as the Company’s independent registered public accounting firm for the year ending December 31, 2015.

Proposal 4 – Approval of Amendment to the Amended and Restated By-Laws of the Company relating to Proxy Access. The Company’s stockholders approved the proposal regarding the amendment to the Amended and Restate By-Laws of the Company relating to Proxy Access.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

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.

EXHIBIT INDEX