Document

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
_________________
FORM 11-K
(Mark One)
¨
ANNUAL REPORT PURSUANT TO SECTION 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934
For the fiscal year ended ____________
OR
þ
TRANSITION REPORT PURSUANT TO SECTION 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from September 8, 2017 to December 31, 2017
Commission file number: 1-8993
A.     Full title of the plan and the address of the plan, if different from that of the issuer named
below:

White Mountains Retirement Plan

B.     Name of issuer of the securities held pursuant to the plan and the address of its principal
executive office:

White Mountains Insurance Group, Ltd.
80 South Main Street
Hanover, NH 03755





REQUIRED INFORMATION

1.
Not applicable.

2.
Not applicable.

3.
Not applicable.

4.
The White Mountains Retirement Plan (the "Plan"), is subject to the requirements of the Employee Retirement lncome Security Act of 1974 ("ERISA"). Pursuant to Section 103(c) of ERISA and the regulations thereunder, the Plan is not required to file audited financial statements because the Plan has fewer than 100 participants. Attached hereto is a copy of the Plan's Summary Annual Report and Schedule I to the Form 5500 that the Plan expects to file with the Employee Benefits Security Administration on or prior to July 31, 2018.



Summary Annual Report and Schedule I to the Form 5500


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SIGNATURES
The Plan. Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or other persons who administer the employee benefit plan) have duly caused this annual report to be signed on its behalf by the undersigned hereunto duly authorized.

 
 
WHITE MOUNTAINS RETIREMENT PLAN

DATED: June 29, 2018
 
By:
 
/s/   Wesley C. Bell
       Wesley C. Bell
Authorized Representative