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): July 1, 2016

51-0020270

(IRS Employer Identification No. of the sponsor and depositor)

47-4047337

(IRS Employer Identification No. of the depositor)

(302) 323-7315

(Telephone, including area code)

Former name or former address, if changed since last report: Not Applicable

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 of July 1, 2016 (the “Addition Date”), Discover Funding LLC, as the holder of the Transferor Certificate, designated certain Discover Card accounts (the “Additional Accounts”) originated by Discover Bank to be added to Discover Card Master Trust I as accounts pursuant to Section 2.10(b) of the Third Amended and Restated Pooling and Servicing Agreement, dated as of December 22, 2015 (as amended, the “Pooling and Servicing Agreement”), between Discover Bank, as Master Servicer and Servicer, Discover Funding LLC, as Transferor, and U.S. Bank National Association as Trustee. The Additional Accounts were selected in a random manner intended to produce a representative sample of all Discover Card accounts not segregated from the Discover Card portfolio as of the Addition Date. The Additional Accounts had an aggregate total receivables balance of approximately $3.6 billion as of the opening of business on the Addition Date.

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 thereunto duly authorized.