HANOVER INSURANCE GROUP, INC.

Previous wording

This document contains certain “forward-looking statements” as defined in the Private Securities Litigation Reform Act of 1995. Forward-looking statements may address, among other things, our growth strategy; expected developments in our business, including losses and loss reserves; the impact of our routine reserve reviews; our expectations regarding our investment activities or results; our proposed actions in response to trends in our business; as well as our expectations, intentions and other statements that are not historical facts. Words such as: “believes,” “anticipates,” “expects,” “projections,” “outlook,” “should,” “could,” “plan,” “guidance,” “likely,” “on track to,” “potential,” “continue,” “targeted,” “designed,” and similar expressions are intended to identify forward-looking statements. Forward-looking statements by their nature address matters that are, to different degrees, uncertain. We caution readers that accuracy with respect to forward-looking projections is difficult and subject to risks and uncertainties. Those risks and uncertainties, in some cases, have affected, and in the future could affect, our actual results and could cause our actual results for the remainder of 2026 and beyond to differ materially from historical results and from those expressed in any of our forward-looking statements. We operate in a business environment that is continually changing, and as such, new risk factors may emerge over time. We cannot predict these new risk factors, nor can we assess the impact, if any, that they may have on our business in the future.

Current wording

This document contains certain “forward-looking statements” as defined in the Private Securities Litigation Reform Act of 1995. Forward-looking statements may address, among other things, our growth strategy; expected developments in our business, including losses and loss reserves; the impact of our routine reserve reviews; our expectations regarding our investment activities or results; our proposed actions in response to trends in our business; as well as our expectations, intentions and other statements that are not historical facts. Words such as: “believes,” “anticipates,” “expects,” “may,” “projections,” “outlook,” “intends,” “should,” “could,” “will,” “plan,” “goal,” “guidance,” “likely,” “on track to,” “potential,” “continue,” “targeted,” “designed,” “positioned,” and similar expressions are intended to identify forward-looking statements. Forward-looking statements by their nature address matters that are, to different degrees, uncertain. We caution readers that accuracy with respect to forward-looking projections is difficult and subject to risks and uncertainties. Those risks and uncertainties, in some cases, have affected, and in the future could affect, our actual results and could cause our actual results for the remainder of 2026 and beyond to differ materially from historical results and from those expressed in any of our forward-looking statements. We operate in a business environment that is continually changing, and as such, new risk factors may emerge over time. We cannot predict these new risk factors, nor can we assess the impact, if any, that they may have on our business in the future.

Previous wording

changes in regulatory, legislative, economic, market and political conditions, particularly with respect to rates, policy terms and conditions, the use of artificial intelligence (“AI”), privacy and data security, payment flexibility, and regions where we have geographical concentration;

Current wording

changes in regulatory, legislative, economic, market and political conditions, particularly with respect to rates, policy terms and conditions, the use of artificial intelligence (“AI”) and other technologies, privacy and data security, payment flexibility, and regions where we have geographical concentration;

Previous wording

Shares purchased in the first quarter of 2026 are as follows:

Current wording

Shares purchased in the second quarter of 2026 are as follows:

Previous wording

Includes 107 shares, 67,689 shares and 663 shares withheld to satisfy tax withholding amounts due from employees related to the receipt of stock which resulted from the exercise or vesting of equity awards for the months ended January 31, February 28 and March 31, 2026.

Current wording

Includes 417 shares and 12,887 shares withheld to satisfy tax withholding amounts due from employees related to the receipt of stock which resulted from the exercise or vesting of equity awards for the months ended April 30 and May 31, respectively.

Previous wording

During the three months ended March 31, 2026, none of the Company’s directors or officers (as defined in Rule 16a-1(f) of the Exchange Act)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 (as such terms are defined in Item 408 of Regulation S-K of the Securities Act of 1933).

Current wording

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 second quarter ended June 30, 2026.