LendingTree (TREE) 10-Q 2017 Q3 Quarterly report

Exhibit 32.1

CERTIFICATION OF THE PRINCIPAL EXECUTIVE OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Douglas R. Lebda, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

(1) the Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2017 of LendingTree, Inc. (the “Report”) which this statement accompanies fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d)); and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of LendingTree, Inc.

Date: October 26, 2017

/s/ Douglas R. Lebda

Douglas R. Lebda

Chairman and Chief Executive Officer

(principal executive officer)