White Mountains reports $313.4M 13F holdings (NYSE: WTM)

Rhea-AI Filing Summary

White Mountains Insurance Group Ltd filed a Form 13F reporting its institutional equity holdings. The report lists a $313,368,520 total value across 2 reported positions and shows 0 other included managers. The filing was signed by Michaela J. Hildreth on 05-12-2026.

Insights

Institutional Holdings Analyst

Routine 13F disclosure: holdings snapshot, not an investment recommendation.

White Mountains submitted a standard Form 13F that aggregates reported long equity positions into an $313,368,520 value across 2 entries. This is a point-in-time disclosure of holdings as required by Section 13(f).

Interpretation depends on the underlying securities and timing; the filing itself does not state trading intent, cash flows, or changes versus prior reports. Subsequent filings or the full 13F information table will show security-level details for further analysis.

Key Figures

Form 13F Information Table Value Total: $313,368,520 Form 13F Information Table Entry Total: 2 positions Number of Other Included Managers: 0 +1 more

4 metrics

Form 13F Information Table Value Total $313,368,520 aggregate reported market value

Form 13F Information Table Entry Total 2 positions number of reported holdings

Number of Other Included Managers 0 other managers included in this report

Signing Date 05-12-2026 signature date by Michaela J. Hildreth

Key Terms

Form 13F, Information Table, 13F holdings report

3 terms

Form 13F regulatory

"The institutional investment manager filing this report"

A Form 13F is a quarterly filing that large investment managers must submit to disclose their holdings in publicly traded stocks and certain other securities. It acts like a peek into the portfolios of big investors, helping other market participants see what large players are buying or selling and offering clues about investment trends, crowded trades, and potential market impact.

Information Table regulatory

"Form 13F Information Table Entry Total: 2"

13F holdings report regulatory

"Report Type X 13F HOLDINGS REPORT"

FAQ

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

It shows a total reported equity value of $313,368,520 across 2 positions. The filing is a snapshot of reported long equity holdings and lists 0 other included managers.

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

The report was signed by Michaela J. Hildreth on 05-12-2026. That signature certifies the accuracy of the reported holdings as of the report's reporting period.

How many holdings did White Mountains disclose in this 13F?

The Form 13F Information Table Entry Total is 2 reported holdings. The filing aggregates those into a reported total market value of $313,368,520.

Does this 13F filing indicate White Mountains' trading intent?

No. The Form 13F discloses positions as of the reporting period; it does not state trading intent, forthcoming transactions, or whether proceeds were received.

Where can I find the security-level details referenced in the summary?

Security-level details appear in the Form 13F Information Table attached to the filing. This excerpt notes the table contains 2 entries totaling $313,368,520.

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

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Accepted by SEC EDGAR 05/12/2026 - 04:01 PM 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: 03-31-2026

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	05-12-2026
[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:		2
	Form 13F Information Table Value Total:		313,368,520
			(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