Lee Willard T. - 24 Feb 2026 Form 4 Insider Report for HANOVER INSURANCE GROUP, INC. (THG)

Role: Executive Vice President
Signature: /s/ Lindsay L. Katz pursuant to Confirming Statement
Issuer symbol: THG
Transactions as of: 24 Feb 2026
Net transactions value: $0
Form type: 4
Filing time: 26 Feb 2026, 16:40:29 UTC
Previous filing: 29 Dec 2025
Next filing: 02 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Lee Willard T	Executive Vice President	C/O THE HANOVER INSURANCE GROUP, INC., 440 LINCOLN STREET, WORCESTER	/s/ Lindsay L. Katz pursuant to Confirming Statement	26 Feb 2026	0001843620

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	THG	Common Stock	Award	$0	+1,154	+21%	$0.000000	6,646	24 Feb 2026	Direct	F1
transaction	THG	Common Stock	Award	$0	+744	+11%	$0.000000	7,390	24 Feb 2026	Direct	F2
transaction	THG	Common Stock	Award	$0	+793	+11%	$0.000000	8,183	24 Feb 2026	Direct	F3

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	THG	Common Stock Option (right to buy)	Award	$0	+3,781		$0.000000	3,781	24 Feb 2026	Common Stock	3,781	$173.56	Direct	F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	On February 27, 2023, the Reporting Person was granted performance-based restricted stock units ("PBRSUs") pursuant to the Issuer's 2022 Long-Term Incentive Plan ("2022 LTIP"). These PBRSUs were subject to a performance-based vesting condition related to three-year average adjusted return on equity and a time-based vesting condition, and also provided for the accumulation of dividend equivalent rights. On February 24, 2026, the performance condition for this award was certified at 150% of the target award (as adjusted for accumulated dividend equivalent rights). This award remains subject to the time-based vesting condition and will vest on February 27, 2026.
F2	On February 27, 2023, the Reporting Person was granted PBRSUs pursuant to the Issuer's 2022 LTIP. These PBRSUs were subject to a performance-based vesting condition related to three-year relative total shareholder return and a time-based vesting condition, and also provided for the accumulation of dividend equivalent rights. On February 24, 2026, the performance condition for this award was certified at 100% of the target award (as adjusted for accumulated dividend equivalent rights). This award remains subject to the time-based vesting condition and will vest on February 27, 2026.
F3	Grant of restricted stock units under the Issuer's 2022 LTIP. Such units vest on the third anniversary of the date of grant.
F4	Such options vest as to one-third of the shares on each of the first three anniversaries of the grant date.