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

November 14, 2006
Date of Report (Date of earliest event reported)

WHITE MOUNTAINS INSURANCE GROUP, LTD.

(Exact name of registrant as specified in its charter)

 

Harborside Financial Center, Plaza 5,

Jersey City, New Jersey 07311-1114

(Address of principal executive offices)

(201) 631-3300

(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:

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

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

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

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

 

ITEM 7.01       Regulation FD Disclosure.

On November 14, 2006, the initial public offering of OneBeacon Insurance Group, Ltd. closed.  The underwriters of the offering exercised their over-allotment option to purchase an additional 3,600,000 million OneBeacon Class A common shares, bringing the total number of common shares sold by the Registrant in the offering to 27,600,000.  Total net proceeds received by the Registrant in the offering were $650.3 million.

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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.
DATED: November 14, 2006	By:	/s/  J. BRIAN PALMER
		J. Brian Palmer
		Chief Accounting Officer

 

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