wtm-20260226FALSE000077686700007768672026-02-262026-02-26
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
February 26, 2026
Date of Report (Date of earliest event reported)
WHITE MOUNTAINS INSURANCE GROUP, LTD.
(Exact name of registrant as specified in its charter)
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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 class | | Trading Symbol(s) | | Name of each exchange on which registered |
| Common Shares, par value $1.00 per share | | WTM | | New York Stock Exchange |
| | WTM.BH | | Bermuda 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 February 26, 2026, White Mountains Insurance Group, Ltd. (NYSE: WTM) (“White Mountains”), RedBird Capital Partners (“RedBird”), and Bishop Street Underwriters (“Bishop Street”) issued a joint press release announcing that White Mountains has completed a $125 million structured capital investment into Bishop Street. Bishop Street, a RedBird portfolio company, is a diversified platform of MGAs and niche underwriting teams focused on the property and casualty insurance sector. A copy of the joint press release is attached as Exhibit 99.1 to this report.
ITEM 9.01. FINANCIAL STATEMENTS AND EXHIBITS.
(d) Exhibits
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.
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| | WHITE MOUNTAINS INSURANCE GROUP, LTD. | |
| February 26, 2026 | | By: | /s/ MICHAELA J. HILDRETH Michaela J. Hildreth Managing Director and Chief Accounting Officer | |