White Mountains Insurance Group (WTM) files 13F showing $203.2M holdings

Rhea-AI Filing Summary

White Mountains Insurance Group Ltd filed a Form 13F disclosing institutional holdings with a reported Form 13F Information Table Value Total of $203,208,267.

The report lists 1 information table entry and is signed by Michaela J. Hildreth, Managing Director and Chief Accounting Officer, on 11-13-2025.

Insights

Institutional Portfolio Analyst

13F filing lists total reported holdings value of $203,208,267.

The filing is a routine quarterly disclosure that aggregates holdings reported by the institutional manager. The form shows a single information-table entry and a total value of $203,208,267, signed on 11-13-2025.

Filing content does not specify individual security names or positions in the provided excerpt; subsequent filings or the full 13F information table would identify specific holdings and quantities.

FAQ

What does White Mountains' Form 13F show for WTM?

The filing reports an institutional holdings value total of $203,208,267. The excerpt lists 1 information-table entry and is signed on 11-13-2025, but individual holdings are not shown in the provided text.

When was the Form 13F signed for White Mountains (WTM)?

The report was signed by Michaela J. Hildreth on 11-13-2025. That signature date appears on the cover page and anchors the reporting period for the disclosed holdings.

How many holdings entries does the White Mountains 13F list?

The Form 13F Information Table Entry Total is 1. The summary also shows a combined holdings value of $203,208,267 for that entry as reported in the excerpt.

Does this excerpt list the specific securities held by White Mountains?

No. The provided excerpt includes the cover and summary only; it shows the aggregate value ($203,208,267) and entry count but does not display the detailed 13F information table with individual securities.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 11/13/2025 - 08:28 AM Learn about SEC filing dates

The Securities and Exchange Commission has not necessarily reviewed the information in this filing and has not determined if it is accurate and complete.
The reader should not assume that the information is accurate and complete.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 13F

FORM 13F COVER PAGE

OMB APPROVAL

OMB Number:			3235-0006
Estimated average burden
hours per response:			23.8

Report for the Calendar Year or Quarter Ended: 09-30-2025

Check here if Amendment		Amendment Number:
This Amendment (Check only one.):		is a restatement.
		adds new holdings entries.

Institutional Investment Manager Filing this Report:
Name:	WHITE MOUNTAINS INSURANCE GROUP LTD
Address:	23 SOUTH MAIN STREET
	SUITE 3B
	HANOVER, NH 03755
Form 13F File Number:	028-01681
CRD Number (if applicable):
SEC File Number (if applicable):

The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists, and tables, are considered integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager:
Name:		Michaela J. Hildreth
Title:		Managing Director and Chief Accounting Officer
Phone:		603-640-2200
Signature, Place, and Date of Signing:
/s/ Michaela J. Hildreth			Boston, MA	11-13-2025
[Signature]			[City, State]	[Date]

Report Type (Check only one.):
X	13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager are reported in this report.)
	13F NOTICE. (Check here if no holdings reported are in this report, and all holdings are reported by other reporting manager(s).)
	13F COMBINATION REPORT. (Check here if a portion of the holdings for this reporting manager are reported in this report and a portion are reported by other reporting manager(s).)

Form 13F Summary Page
	Report Summary:
	Number of Other Included Managers:		0
	Form 13F Information Table Entry Total:		1
	Form 13F Information Table Value Total:		203,208,267
			(round to nearest dollar)

List of Other Included Managers:

Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report.

[If there are no entries in this list, state "NONE" and omit the column headings and list entries.]

NONE