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SCHEDULE III SUPPLEMENTARY INSURANCE INFORMATION

12 Months Ended

Dec. 31, 2025

SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract]

SCHEDULE III SUPPLEMENTARY INSURANCE INFORMATION

SCHEDULE III

THE HANOVER INSURANCE GROUP, INC.

SUPPLEMENTARY INSURANCE INFORMATION


DECEMBER 31, 2025
(in millions)
Segments	Deferred acquisition costs		Future policy benefits, losses, claims and loss expenses		Unearned premiums		Other policy claims and benefits payable		Premium revenue		Net investment income (1)		Benefits, claims, losses and settlement expenses		Amortization of deferred acquisition costs		Other operating expenses (2)		Premiums written
Core Commercial	$	234.6	$	3,853.1	$	1,187.9	$	8.3	$	2,211.0	$	202.5	$	1,411.9	$	481.2	$	274.7	$	2,273.7
Specialty		227.0		1,725.7		850.8		7.1		1,398.3		102.6		676.9		367.2		165.5		1,441.5
Personal Lines		241.4		2,131.4		1,401.7		—		2,551.8		128.5		1,639.8		436.8		238.6		2,606.9
Other		—		29.6		—		—		—		20.8		0.7		—		14.1		—
Interest on Debt		—		—		—		—		—		—		—		—		43.2		—
Eliminations		—		—		—		—		—		—		—		—		—		—
Total	$	703.0	$	7,739.8	$	3,440.4	$	15.4	$	6,161.1	$	454.4	$	3,729.3	$	1,285.2	$	736.1	$	6,322.1


DECEMBER 31, 2024
(in millions)
Segments	Deferred acquisition costs		Future policy benefits, losses, claims and loss expenses		Unearned premiums		Other policy claims and benefits payable		Premium revenue		Net investment income (1)		Benefits, claims, losses and settlement expenses		Amortization of deferred acquisition costs		Other operating expenses (2)			Premiums written
Core Commercial	$	230.8	$	3,606.3	$	1,121.4	$	7.4	$	2,148.8	$	170.4	$	1,302.1	$	462.6	$	277.9		$	2,195.5
Specialty		209.2		1,669.1		800.4		6.7		1,322.0		84.5		646.7		347.4		160.6			1,373.9
Personal Lines		222.8		2,108.8		1,361.5		—		2,441.8		106.7		1,807.2		411.7		234.0			2,514.2
Other		—		62.9		—		—		—		11.0		1.4		—		17.5			—
Interest on Debt		—		—		—		—		—		—		—		—		34.1			—
Eliminations		—		—		—		—		—		—		—		—		(3.6	)		—
Total	$	662.8	$	7,447.1	$	3,283.3	$	14.1	$	5,912.6	$	372.6	$	3,757.4	$	1,221.7	$	720.5		$	6,083.6


DECEMBER 31, 2023
(in millions)
Segments	Deferred acquisition costs		Future policy benefits, losses, claims and loss expenses		Unearned premiums		Other policy claims and benefits payable		Premium revenue		Net investment income (1)		Benefits, claims, losses and settlement expenses		Amortization of deferred acquisition costs		Other operating expenses (2)			Premiums written
Core Commercial	$	223.0	$	3,461.5	$	1,066.8	$	6.9	$	2,060.3	$	151.8	$	1,354.9	$	443.8	$	250.9		$	2,107.0
Specialty		193.6		1,619.6		755.1		5.9		1,274.2		71.1		645.5		329.5		133.2			1,293.3
Personal Lines		204.2		2,148.8		1,280.6		—		2,328.6		96.8		2,131.9		402.7		211.6			2,409.9
Other		—		65.4		—		—		—		12.4		2.3		—		20.1			—
Interest on Debt		—		—		—		—		—		—		—		—		34.1			—
Eliminations		—		—		—		—		—		—		—		—		(8.1	)		—
Total	$	620.8	$	7,295.3	$	3,102.5	$	12.8	$	5,663.1	$	332.1	$	4,134.6	$	1,176.0	$	641.8		$	5,810.2

(1)

The Company manages investment assets for its Core Commercial, Specialty, Personal Lines and Other segments on a combined basis, based on the requirements of its combined insurance companies. Net investment income is allocated to these segments based on actuarial information related to the underlying businesses.

(2)

For other operating expenses that are not directly attributable to a single segment, expenses are allocated using a consistent and reasonable approach, generally based on net premiums earned.