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    White Mountains Insurance Group Ltd. filed SEC Form 8-K: Other Events, Financial Statements and Exhibits

    7/18/25 9:25:45 AM ET
    $WTM
    Property-Casualty Insurers
    Finance
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    wtm-20250718
    FALSE0000776867Bermuda1-899394-270845503755☐☐☐☐☐00007768672025-07-182025-07-18

    UNITED STATES
    SECURITIES AND EXCHANGE COMMISSION
    Washington, D.C. 20549
    FORM 8-K

    CURRENT REPORT
    Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

    July 18, 2025
    Date of Report (Date of earliest event reported)

    WHITE MOUNTAINS INSURANCE GROUP, LTD.
    (Exact name of registrant as specified in its charter)
    Bermuda
    (State or other jurisdiction of
     incorporation or organization)
    1-8993
    (Commission file number)
    94-2708455
    (I.R.S. Employer Identification No.)

    23 South Main Street, Suite 3B, Hanover, New Hampshire 03755
    (Address of principal executive offices)

    (603) 640-2200
    (Registrant’s telephone number, including area code)

    Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

    ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

    ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

    ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

    ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

    Securities registered pursuant to Section 12(b) of the Act:
    Title of each classTrading Symbol(s)Name of each exchange on which registered
    Common Shares, par value $1.00 per shareWTMNew York Stock Exchange
    WTM.BHBermuda Stock Exchange

    Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933(§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).                                     Emerging growth company ☐
    If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.      o



    ITEM 8.01 Other Events.

    On July 18, 2025, the Company closed its previously announced $150 million investment in BroadStreet Partners (“BroadStreet”). A copy of the press release jointly issued by BroadStreet, the Company and the other co-lead investors is furnished as Exhibit 99.1 to this report.

    ITEM 9.01   Financial Statements and Exhibits.

    (d) Exhibits

    99.1 Press Release, dated July 18, 2025




    2


    SIGNATURES

    Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.


    WHITE MOUNTAINS INSURANCE GROUP, LTD.
    Date: July 18, 2025By:
    /s/   MICHAELA J. HILDRETH    
           Michaela J. Hildreth
          Managing Director and
          Chief Accounting Officer
    3
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