SEC Filing | White Mountains Insurance Group

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UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 13F FORM 13F COVER PAGE INFORMATION REQUIRED OF INSTITUTIONAL INVESTMENT MANAGERS PURSUANT TO SECTION 13(F) OF THE SECURITIES EXCHANGE ACT OF 1934 AND RULES THEREUNDER Report for the Calendar Year or Quarter Ended December 31 , 2000. 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 of Principal Executive Office: 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 therein 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: Michael S. Paquette Title: Senior Vice President and Controller Phone: (603) 640-2205 Signature, Place, and Date of Signing: /s/ Michael S. Paquette Hanover, New Hampshire February 13, 2001 - ----------------------- ---------------------- ----------------- [Signature] [City, State] [Date] Report Type (Check only one): [X] 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).) [ ] 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: Form 13F File Number Name - - None

FORM 13F SUMMARY PAGE Report Summary: Number of Other Included Managers: 1 ------------- Form 13F Information Table Entry Total: 63 ITEMS ------------- Form 13F Information Table Value Total: $177,768,322 ------------- List of Other Included Managers: Provide a numbered list of the names and Form 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report. No. Form 13F File Number Name 1. 028-07388 Folksamerica Holding Company, Inc.

WHITE MOUNTAINS INSURANCE GROUP, LTD. FORM 13F INFORMATION TABLE - DECEMBER 31, 2000 ----------------------------------------------------------------------------------------------------------------------- Title CUSIP Market Amount and Name of Issuer of class Number Value Type of Security ----------------------------------------------------------------------------------------------------------------------- 1 Aetna Inc New COM 00817Y-10-8 162,197 3,950 SH 2 Affiliated Computer Services CL A 008190-10-0 412,675 6,800 SH 3 Alleghany Corp Del COM 017175-10-0 579,510 2,820 SH 4 Ambac Finl Group Inc. COM 023139-10-8 677,883 11,625 SH 5 American Intl Group Inc COM 026874-10-7 4,250,508 43,125 SH 6 Amgen Inc. COM 031162-10-0 4,795,313 75,000 SH 7 Aon Corp. COM 037389-10-3 4,831,305 141,060 SH 8 Arden Rlty Inc COM 039793-10-4 2,386,875 95,000 SH 9 Berkley W.R. Corp COM 084423-10-2 278,406 5,900 SH 10 Berkshire Hathaway, Inc. Del CL A 084670-10-8 34,435,000 485 SH 11 Berkshire Hathaway, Inc. Del CL B 084670-20-7 23,116,280 9,820 SH 12 Berkshire Hathaway, Inc. Del CL B 084670-20-7 1,228,788 522 SH 13 Bisys Group Inc. COM 055472-10-4 263,753 5,060 SH 14 Bristol Myers Squibb Co. COM 110122-10-8 3,549,000 48,000 SH 15 Camden Ppty Tr SH BEN INT 133131-10-2 2,254,550 67,300 SH 16 Carnival Corp. COM 143658-10-2 603,925 19,600 SH 17 Cisco Sys Inc COM 17275R-10-2 4,647,375 121,500 SH 18 Citigroup Inc. COM 172967-10-1 5,446,633 106,666 SH 19 Coca Cola Co COM 191216-10-0 1,767,188 29,000 SH 20 Concord EFS Inc. COM 206197-10-5 351,500 8,000 SH 21 Dime Bancorp Inc New COM 25429Q-10-2 286,756 9,700 SH 22 Elan PLC ADR 284131-20-8 3,604,563 77,000 SH 23 E M C Corp Mass COM 268648-10-2 7,315,000 110,000 SH 24 Fidelity Natl Finl, Inc. COM 316326-10-7 7,046,936 190,780 SH 25 First Data Corp. COM 319963-10-4 603,272 11,450 SH 26 Gables Residential Tr SH BEN INT 362418-10-5 557,200 19,900 SH 27 General Elec Co. COM 369604-10-3 5,464,875 114,000 SH 28 HCC Ins. Hldgs Inc. COM 404132-10-2 433,155 16,080 SH 29 IMS Health Inc COM 449934-10-8 545,400 20,200 SH 30 Intel Corp. COM 458140-10-0 2,705,625 90,000 SH 31 International Speedway Corp CL A 460335-20-1 226,480 5,960 SH 32 Intuit COM 461202-10-3 761,144 19,300 SH 33 Jefferson Pilot Corp. COM 475070-10-8 485,875 6,500 SH 34 John Hancock Financial COM 41014S-10-6 1,185,188 31,500 SH 35 Johnson & Johnson COM 478160-10-4 5,043,000 48,000 SH 36 Lafarge Corp. COM 505862-10-2 80,561 3,410 SH 37 Liberty Financial Cos. Inc COM 530512-10-2 307,481 6,900 SH 38 London Pac Group Ltd. SPONSORED ADR 542073-10-1 156,544 20,700 SH 39 Mack-Cali Rlty Corp COM 554489-10-4 3,141,875 110,000 SH 40 Marsh & McLennan Cos. Inc. COM 571748-10-2 596,700 5,100 SH 41 Microsoft Corp COM 594918-10-4 1,604,875 37,000 SH 42 Millicom Intl Cellular S A ORD L6388F-10-2 113,620 4,940 SH 43 Morgan J P & Co Inc. COM 616880-10-0 347,550 2,100 SH 44 Partner Re Ltd. COM G6852T-10-5 756,400 12,400 SH 45 Pepsico Inc. COM 713448-10-8 1,308,450 26,400 SH 46 Pfizer Inc. COM 717081-10-3 2,760,000 60,000 SH 47 Post Pptys Inc COM 737464-10-7 2,959,925 78,800 SH 48 Public Storage Inc. COM 74460D-10-9 1,434,438 59,000 SH 49 PXRE Group Ltd COM G73018-10-6 5,916,375 350,600 SH 50 PXRE Group Ltd COM G73018-10-6 236,250 14,000 SH 51 Qualcomm, Inc. COM 747525-10-3 2,054,688 25,000 SH 52 Reckson Associates Realty Corp COM 75621K-10-6 2,892,213 115,400 SH 53 Renaissance Re Hldgs Ltd COM G7496G-10-3 963,244 12,300 SH 54 Schering-Plough Corp. COM 806605-10-1 4,239,225 74,700 SH 55 Security Cap US Rlty SPONSORED ADR 814136-20-6 4,027,250 178,000 SH 56 Shurgard Storage Ctrs Inc. COM 82567D-10-4 1,527,344 62,500 SH 57 Summit Pptys Inc COM 866239-10-6 2,334,800 89,800 SH 58 Trenwick Group Ltd. COM G9032C-10-9 273,930 11,040 SH 59 Trizec Hahn Corp SUB VTG 896938-10-7 1,210,000 80,000 SH 60 UICI COM 902737-10-5 170,822 28,770 SH 61 Waddell & Reed Financial Inc. CL A 930059-10-0 625,704 16,630 SH 62 Wal-Mart Stores, Inc. COM 931142-10-3 2,805,000 52,800 SH 63 XL Capital Ltd. CL A G98255-10-5 619,926 7,095 SH --------------------------------- $ 177,768,323 3,116,988 * 1 = Folksamerica Holding Company, Inc. (FORM 13F filed separately) 2 = White Mountains Insurance Group, Ltd.

WHITE MOUNTAINS INSURANCE GROUP, LTD. FORM 13F INFORMATION TABLE - DECEMBER 31, 2000 (continued) ---------------------------------------------------------------------------------------------------------------------- Voting Authority (Shares) Investment ----------------------------------- Name of Issuer Discretion Managers * Sole Shared None ---------------------------------------------------------------------------------------------------------------------- 1 Aetna Inc New DEFINED 1,2 3,950 2 Affiliated Computer Services DEFINED 1,2 6,800 3 Alleghany Corp Del DEFINED 1,2 2,820 4 Ambac Finl Group Inc. DEFINED 1,2 11,625 5 American Intl Group Inc DEFINED 1,2 43,125 6 Amgen Inc. DEFINED 1,2 75,000 7 Aon Corp. DEFINED 1,2 141,060 8 Arden Rlty Inc DEFINED 1,2 95,000 9 Berkley W.R. Corp DEFINED 1,2 5,900 10 Berkshire Hathaway, Inc. Del SOLE 2 485 11 Berkshire Hathaway, Inc. Del SOLE 2 9,820 12 Berkshire Hathaway, Inc. Del DEFINED 1,2 522 13 Bisys Group Inc. DEFINED 1,2 5,060 14 Bristol Myers Squibb Co. DEFINED 1,2 48,000 15 Camden Ppty Tr DEFINED 1,2 67,300 16 Carnival Corp. DEFINED 1,2 19,600 17 Cisco Sys Inc DEFINED 1,2 121,500 18 Citigroup Inc. DEFINED 1,2 106,666 19 Coca Cola Co DEFINED 1,2 29,000 20 Concord EFS Inc. DEFINED 1,2 8,000 21 Dime Bancorp Inc New DEFINED 1,2 9,700 22 Elan PLC DEFINED 1,2 77,000 23 E M C Corp Mass DEFINED 1,2 110,000 24 Fidelity Natl Finl, Inc. DEFINED 1,2 190,780 25 First Data Corp. DEFINED 1,2 11,450 26 Gables Residential Tr DEFINED 1,2 19,900 27 General Elec Co. DEFINED 1,2 114,000 28 HCC Ins. Hldgs Inc. DEFINED 1,2 16,080 29 IMS Health Inc DEFINED 1,2 20,200 30 Intel Corp. DEFINED 1,2 90,000 31 International Speedway Corp DEFINED 1,2 5,960 32 Intuit DEFINED 1,2 19,300 33 Jefferson Pilot Corp. DEFINED 1,2 6,500 34 John Hancock Financial DEFINED 1,2 31,500 35 Johnson & Johnson DEFINED 1,2 48,000 36 Lafarge Corp. DEFINED 1,2 3,410 37 Liberty Financial Cos. Inc DEFINED 1,2 6,900 38 London Pac Group Ltd. DEFINED 1,2 20,700 39 Mack-Cali Rlty Corp DEFINED 1,2 110,000 40 Marsh & McLennan Cos. Inc. DEFINED 1,2 5,100 41 Microsoft Corp DEFINED 1,2 37,000 42 Millicom Intl Cellular S A DEFINED 1,2 4,940 43 Morgan J P & Co Inc. DEFINED 1,2 2,100 44 Partner Re Ltd. DEFINED 1,2 12,400 45 Pepsico Inc. DEFINED 1,2 26,400 46 Pfizer Inc. DEFINED 1,2 60,000 47 Post Pptys Inc DEFINED 1,2 78,800 48 Public Storage Inc. DEFINED 1,2 59,000 49 PXRE Group Ltd SOLE 2 350,600 50 PXRE Group Ltd DEFINED 1,2 14,000 51 Qualcomm, Inc. DEFINED 1,2 25,000 52 Reckson Associates Realty Corp DEFINED 1,2 115,400 53 Renaissance Re Hldgs Ltd DEFINED 1,2 12,300 54 Schering-Plough Corp. DEFINED 1,2 74,700 55 Security Cap US Rlty DEFINED 1,2 178,000 56 Shurgard Storage Ctrs Inc. DEFINED 1,2 62,500 57 Summit Pptys Inc DEFINED 1,2 89,800 58 Trenwick Group Ltd. DEFINED 1,2 11,040 59 Trizec Hahn Corp DEFINED 1,2 80,000 60 UICI DEFINED 1,2 28,770 61 Waddell & Reed Financial Inc. DEFINED 1,2 16,630 62 Wal-Mart Stores, Inc. DEFINED 1,2 52,800 63 XL Capital Ltd. DEFINED 1,2 7,095 * 1 = Folksamerica Holding Company, Inc. (FORM 13F filed separately) 2 = White Mountains Insurance Group, Ltd.