X0508 4 2025-07-28 0000080661 PROGRESSIVE CORP/OH/ PGR 0001198113 Griffith Susan Patricia 300 NORTH COMMONS BLVD. MAYFIELD VILLAGE OH 44143 1 1 President and CEO 1 Common 2025-07-28 4 S 0 30660 242.1167 D 506945.043 D Common 15757.628 I 401(k) Plan Common 19108 I Husband's Common Common 53737.096 I Husband's Trust This transaction reported on this Form 4 was made pursuant to a 10b5-1 trading plan adopted by the reporting person as of March 30, 2025. The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $239.220 and $248.726, inclusive. The reporting person undertakes to provide to The Progressive Corporation, any security holder of The Progressive Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. Held in a trust for the benefit of reporting person's spouse. /s/ Sarah R. D'Amore, By Power of Attorney 2025-07-30