The Progressive Corporation (PGR) 10-K 2013 FY Annual report

Exhibit 32.1

SECTION 1350 CERTIFICATION

I, Glenn M. Renwick, President and Chief Executive Officer of The Progressive Corporation (the “Company”), certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, that:

(1) the Annual Report on Form 10-K of the Company for the period ended December 31, 2013 (the “Report”), which this certification 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) information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Glenn M. Renwick

Glenn M. Renwick

President and Chief Executive Officer

February 26, 2014