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, 2003 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: Alleghany Corporation Address: 375 Park Avenue New York, NY 10152 Form 13F File Number: 28-1590 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: Peter R. Sismondo Title: Vice President, Controller, Treasurer and Assistant Secretary Phone: 212-752-1356 Signature, Place, and Date of Signing: /s/ Peter R. Sismondo New York, NY August 13, 2003 -------------------------------------------------------------------------------- [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).) Form 13F SUMMARY PAGE Report Summary: Number of Other Included Managers: 1 Form 13F Information Table Entry Total: 22 Form 13F Information Table Value Total: $698,783 (thousands) List of Other Included Managers: No. Form 13F File Number Name 2 Underwriters Reinsurance Company SECURITIES AND EXCHANGE COMMISSIONS FORM 13F INFORMATION PREPARED FOR ALLEGHANY CORPORATION AS OF 06/30/03 COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8 ---------------------- -------------- --------- -------- --------------------- ----------------- -------- ---------------- INVESTMENT VOTING NAME OF ISSUER TITLE OF CLASS CUSIP MARKET SHRS OR SH/ PUT/ DISCRETION MANAGER AUTHORITY VALUE PRIN AMT PRN CALL SOLE SHRD OTHER SOLE SHRD NONE (X 1000) (A) (B) (C) (A) (B) (C) ALTRIA GROUP INC COM 02209S103 1,136 25,000 SH X 1 X AMB PROPERTY CORP COM 00163T109 837 29,700 SH X 1 X AMEREN CORP COM 023608102 4,410 100,000 SH X 1 X APARTMENT INVT & MGMT CO CL A 03748R101 927 26,800 SH X 1 X ARCH COAL INC COM 039380100 6,251 272,035 SH X 1 X ARCH COAL INC COM 039380100 14,431 627,965 SH X 2 X ARCHSTONE-SMITH TR COM 039583109 1,154 48,093 SH X 1 X AVALONBAY CMNTYS INC COM 053484101 1,137 26,664 SH X 1 X BRE PROPERTIES INC CL A 05564E106 1,034 31,150 SH X 1 X BERKSHIRE HATHAWAY INC DEL CL B 084670207 2,748 1,131 SH X 1 X BOSTON PROPERTIES INC COM 101121101 1,592 36,350 SH X 1 X BURLINGTON NORTHN SANTA FE COM 12189T104 337,479 11,866,352 SH X 1 X BURLINGTON NORTHN SANTA FE COM 12189T104 117,561 4,133,648 SH X 2 X CIGNA CORP COM 125509109 69,796 1,486,910 SH X 1 X CIGNA CORP COM 125509109 117,964 2,513,090 SH X 2 X CINERGY CORP COM 172474108 3,679 100,000 SH X 1 X FEDERAL REALTY INVT TR SH BEN INT 313747206 1,108 34,640 SH X 1 X FIRST FED CAP CORP COM 319960100 1,899 96,000 SH X 1 X FIRST INDUSTRIAL REALTY TRUS COM 32054K103 841 26,600 SH X 1 X GENERAL GROWTH PPTYS INC COM 370021107 1,408 22,550 SH X 1 X GREAT PLAINS ENERGY INC COM 391164100 2,888 100,000 SH X 1 X MACERICH CO COM 554382101 1,100 31,310 SH X 1 X MACK CALI RLTY CORP COM 554489104 1,441 39,600 SH X 1 X SAFECO CORP COM 786429100 3,529 100,000 SH X 1 X UNITED FIRE & CAS CORP COM 910331107 2,433 75,684 SH X 1 X GRAND TOTAL 698,783 21,851,272