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SCHEDULE I SUMMARY OF INVESTMENTS - OTHER THAN INVESTMENTS IN RELATED PARTIES

12 Months Ended

Dec. 31, 2025

SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Abstract]

SCHEDULE I SUMMARY OF INVESTMENTS - OTHER THAN INVESTMENTS IN RELATED PARTIES

SCHEDULE I

THE HANOVER INSURANCE GROUP, INC.

SUMMARY OF INVESTMENTS – OTHER THAN INVESTMENTS IN RELATED PARTIES

DECEMBER 31, 2025
(in millions)
Type of investment		Cost (1)				Fair Value				Amount at which shown in the balance sheet (2)
Fixed maturities:
Bonds:
U.S. Government and government agencies and authorities		$	2,500.7			$	2,410.8			$	2,410.8
States, municipalities and political subdivisions			910.8				847.7				847.7
Foreign governments			2.5				2.7				2.7
Public utilities			353.5				355.5				355.5
All other corporate bonds			5,916.6				5,918.0				5,918.0
Total fixed maturities			9,684.1				9,534.7				9,534.7
Equity securities:
Common stocks:
Public utilities			10.2				26.3				26.3
Banks, trusts and insurance companies			1.6				3.0				3.0
Industrial, miscellaneous and all other			53.5				136.5				136.5
Nonredeemable preferred stock			12.4				19.0				19.0
Total equity securities			77.7				184.8				184.8
Mortgage loans on real estate			255.1				238.7				247.0
Other long-term investments			386.1				414.4				414.4
Short-term investments			1.8				1.8				1.8
Total investments		$	10,404.8			$	10,374.4			$	10,382.7

(1)Original cost of equity securities and, as to fixed maturities, original cost reduced by repayments and adjusted for amortization of premiums and accretion of discounts.

(2)Mortgage loans on real estate are shown on the balance sheet at unpaid principal balances adjusted for deferred fees or expenses, net of an allowance for credit losses.

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- Definition

The entire disclosure of information about investment held by insurance company, excluding investment in related party.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 15
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 7
-Subparagraph (SX 210.12-15)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-7

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