comScore (SCOR) 10-Q 2019 Q1 Quarterly report

Exhibit 32.1

Certification Pursuant to 18 U.S.C. Section 1350

In connection with the Quarterly Report of comScore, Inc. (the “Company”) on Form 10-Q for the quarter ended March 31, 2019, as filed with the Securities and Exchange Commission (the “SEC”) on the date hereof (the “Report”), I, Dale Fuller, Interim Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

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

A signed original of this written statement has been provided to the Company and will be retained by the Company and furnished to the SEC or its staff upon request.

/s/ Dale Fuller

Dale Fuller

Interim Chief Executive Officer

(Principal Executive Officer)

Date: May 8, 2019