WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

Position in THG — Hanover Insurance Group, Inc.

CIK 1644956 CHICAGO, IL

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Position in THG

as of Mar 31, 2026 · filed May 8, 2026 Compact

Position Value

$33,934,996

+$6,662,240 QoQ

Shares Held

195,760

+31.2% QoQ

Ownership

0.560%

of shares outstanding

% of Portfolio

0.11%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

10 quarters on record

Voting authority Sole 69% Shared 0% None 31%

Common Shares in THG Over Time

Shares Held

Position Value (USD)

Position in Insurance - Property & Casualty

Financial Services · as of Mar 31, 2026

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds $68,181,016 across 4 Insurance - Property & Casualty names. THG ranks #1 (49.8% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	THG	Hanover Insurance Group, Inc. This page	195,760	$33,934,996
2	SIGI	Selective Insurance Group Inc	370,419	$27,925,888
3	PGR	Progressive Corp/Oh/	30,797	$6,105,197
4	AFG	American Financial Group Inc	1,683	$214,935

All Filings in THG

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10 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$33,934,996	195,760	+31.2%	Shares	Sole	2026-05-08
2025-12-31	$27,272,756	149,219	+6.7%	Shares	Sole	2026-02-09
2025-09-30	$25,408,583	139,892	+48.2%	Shares	Sole	2025-11-12
2022-09-30	$12,094,493	94,385	+1016.1%	Shares	Sole	2022-11-09
2021-06-30	$1,147,107	8,457	-88.5%	Shares	Sole	2021-08-12
2021-03-31	$9,515,310	73,500	-36.9%	Shares	Sole	2021-05-13
2020-12-31	$13,624,570	116,529	-1.9%	Shares	Sole	2021-02-09
2020-09-30	$11,071,927	118,823	+9.2%	Shares	Sole	2020-11-06
2020-06-30	$11,028,250	108,835	-0.4%	Shares	Sole	2020-08-12
2020-03-31	$9,895,955	109,251	—	Shares	Sole	2020-05-08
No filing history on record for this holder in this stock.