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HANOVER INSURANCE GROUP, INC.

For the period ended Dec 31, 2025. Filed Feb 20, 2026.

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A company's yearly report to the SEC, with audited financial statements. It is the fullest account a company gives of its business, its finances and the risks it sees.

FY2025 · Filed Feb 20, 2026

THG$245.23+1.0%Stored close · as of Nov 9, 2026

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Contents

Item 9B. Other Information

Rule 10b5-1 Trading Plans

On November 19, 2025, John C. Roche, the Company’s President and Chief Executive Officer, adopted a trading plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). His 10b5-1 trading plan provides for the net exercise, and subsequent sale, of options to purchase an aggregate of 51,318 shares of the Company’s common stock. The options were granted in 2017 and 2018. The 10b5-1 trading plan expires on February 19, 2027, or upon an earlier date if and when all the options are exercised and sold. The amount of shares actually sold will depend on the satisfaction of certain conditions as set forth in his 10b5-1 trading plan.

No other officer or director adopted, modified, orterminated a contract, instruction or written plan for the purchase or sale of the Company’s securities intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) or a non-Rule 10b5-1 trading arrangement during the fourth quarter ended December 31, 2025.

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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.