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UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 13F FORM 13F COVER PAGE Report for the Calendar Year or Quarter Ended: June 30, 2010 ----------------------- 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: 80 South Main Street ------------------------------------- Hanover, New Hampshire 03755-2053 ------------------------------------- U.S.A. ------------------------------------- Form 13F File Number: 028-01681 --------------------- 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: J. Brian Palmer ------------------------------------------- Title: Vice President and Chief Accounting Officer ------------------------------------------- Phone: (603) 640-2200 ------------------------------------------- Signature, Place, and Date of Signing: /s/ J. Brian Palmer Boston, Massachusetts August 12, 2010 ------------------------------- --------------------- --------------- [Signature] [City, State] [Date] Report Type (Check only one.): / / 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).) /X/ 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).) List of Other Managers Reporting for this Manager: No. Form 13F File Number Name 1 028-12951 OneBeacon Insurance Group, Ltd. - --- --------------- ------------------------------------ 2 028-00470 White Mountains Advisors LLC - --- --------------- ------------------------------------ FORM 13F SUMMARY PAGE Report Summary: Number of Other Included Managers: 0 -------------------- Form 13F Information Table Entry Total: 1 -------------------- Form 13F Information Table Value Total: $353 -------------------- (thousands) FORM 13F INFORMATION TABLE
COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8 - ------------------------- ---------------- --------- -------- ---------------------- ------------ ---------- ---------------------- VALUE SHRS OR SH/ PUT/ INVESTMENT OTHER VOTING AUTHORITY NAME OF ISSUER TITLE OF CLASS CUSIP (x$1000) PRN AMT PRN CALL DISCRETION MANAGERS SOLE SHARED NONE - ------------------------- ---------------- --------- -------- --------- ----- ------ ------------ ---------- ------ -------- ------ SIEMENS AG SPONSORED ADR 826197501 $ 353 3,900 SH SOLE N/A 3,900