X0508 4 2025-09-19 0000080661 PROGRESSIVE CORP/OH/ PGR 0001638126 Callahan Patrick K 300 NORTH COMMONS BLVD. MAYFIELD VILLAGE OH 44143 1 Personal Lines President 1 Common 2025-09-19 4 S 0 6420 242.2182 D 15191.521 D This transaction reported on this Form 4 was made pursuant to a 10b5-1 trading plan adopted by the reporting person as of November 18, 2024. The price reported in Column 4 is the weighted average price. These shares were sold in multiple transactions at prices ranging from $241.138 and $243.490, 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. /s/ Sarah R. D'Amore, By Power of Attorney 2025-09-22