UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 13F Form 13F COVER PAGE Report for the Calendar Year or Quarter Ended: March 31, 2005 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 May 9, 2005 -------------------------------------------------------------------------------- [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: Form 13F Information Table Entry Total: 80 Form 13F Information Table Value Total: $ 620,302 (thousands) List of Other Included Managers: No. Form 13F File Number Name SECURITIES AND EXCHANGE COMMISSIONS FORM 13F INFORMATION PREPARED FOR ALLEGHANY CORPORATION AS OF 03/31/05 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) ------------------------- -------------- ---------- -------- ---------- --- ---- ---- ---- ----- ------- ---- ---- ---- FRESH DEL MONTE PRODUCE INC ORD G36738105 4,578 150,000 SH X 1 X AMB PROPERTY CORP COM 00163T109 1,580 41,800 SH X 1 X ALEXANDER & BALDWIN INC COM 014482103 824 20,000 SH X 1 X AMERICAN EXPRESS CO COM 025816109 1,027 20,000 SH X 1 X AMERICAN INTL GROUP INC COM 026874107 1,108 20,000 SH X 1 X ANADARKO PETE CORP COM 032511107 9,513 125,000 SH X 1 X APARTMENT INVT & MGMT CO CL A 03748R101 1,655 44,500 SH X 1 X APPLERA CORP COM AP BIO GRP 038020903 987 50,000 SH X 1 X APPLIED MATLS INC COM 038222105 813 50,000 SH X 1 X ARCHSTONE SMITH TR COM 039583109 1,566 45,900 SH X 1 X ARDEN RLTY INC COM 039793104 1,439 42,500 SH X 1 x AUTODESK INC COM 052769106 893 30,000 SH X 1 X AVALONBAY CMNTYS INC COM 053484101 1,538 23,000 SH X 1 X BRE PROPERTIES INC CL A 05564E106 1,472 41,700 SH X 1 X BANK OF AMERICA CORPORATION COM 060505104 8,820 200,000 SH X 1 X BELO CORP COM SER A 080555105 845 35,000 SH X 1 X BERKSHIRE HATHAWAY INC DEL CL B 084670207 4,373 1,531 SH X 1 X BOEING CO COM 097023105 877 15,000 SH X 1 X BURLINGTON NORTHN SANTA FE C COM 12189T104 431,440 8,000,000 SH X 1 X BURLINGTON RES INC COM 122014103 1,001 20,000 SH X 1 X CATERPILLAR INC DEL COM 149123101 1,372 15,000 SH X 1 X CHUBB CORP COM 171232101 1,189 15,000 SH X 1 X CITIGROUP COM 172967101 4,494 100,000 SH X 1 X COCA COLA CO COM 191216100 1,042 25,000 SH X 1 X CONOCOPHILLIPS COM 20825C104 1,618 15,000 SH X 1 X CORPORATE OFFICE PPTYS TR SH BEN INT 22002T108 1,576 59,500 SH X 1 X COSTCO WHSL CORP NEW COM 22160K105 1,325 30,000 SH X 1 X COUNTRYWIDE FINANCIAL CORP COM 222372104 4,869 150,000 SH X 1 X DEERE & CO COM 244199105 1,007 15,000 SH X 1 X DEVON ENERGY CORP NEW COM 25179M103 10,774 225,000 SH X 1 X DISNEY WALT CO COM DISNEY 254687106 1,293 45,000 SH X 1 X DOMINION RES INC VA NEW COM 25746U109 5,359 72,000 SH X 1 X DOW CHEM CO COM 260543103 1,246 25,000 SH X 1 X DU PONT EI DE NEMOURS & CO COM 263534109 1,025 20,000 SH X 1 X EXXON MOBIL CORP COM 30231G102 1,788 30,000 SH X 1 X FEDERAL REALTY INVT TR SH BEN INT 313747206 1,557 32,200 SH X 1 X FEDEX CORP COM 31428X106 1,409 15,000 SH X 1 X GUIDANT CORP COM 401698105 739 10,000 SH X 1 X INTEL CORP COM 458140100 1,162 50,000 SH X 1 X INTERNATIONAL BUSINESS MACHS COM 459200101 1,097 12,000 SH X 1 X JEFFERSON PILOT CORP COM 475070108 981 20,000 SH X 1 X JOHNSON & JOHNSON COM 478160104 6,716 100,000 SH X 1 X KERR MCGEE CORP COM 492386107 11,750 150,000 SH X 1 X LAUDER ESTEE COS INC CL A 518439104 675 15,000 SH X 1 X LIBERTY MEDIA CORP NEW COM SER A 530718105 1,141 110,000 SH X 1 X LIBERTY MEDIA INTL INC COM SER A 530719103 290 6,625 SH X 1 X LILLY ELI & CO COM 532457108 1,042 20,000 SH X 1 X MBIA INC COM 55262C100 261 5,000 SH X 1 X MACERICH CO COM 554382101 1,508 28,310 SH X 1 X MAGNA INTL INC CL A 559222401 6,690 100,000 SH X 1 X MANPOWER INC COM 56418H100 870 20,000 SH X 1 X MEDTRONIC INC COM 585055106 1,529 30,000 SH X 1 X MERCK & CO INC COM 589331107 32,856 1,015,000 SH X 1 X MICROSOFT CORP COM 594918104 1,692 70,000 SH X 1 X MILLIPORE CORP COM 601073109 1,302 30,000 SH X 1 X NEWS CORP LTD SP ADR PFD 652487802 1,184 70,000 SH X 1 X NOBLE ENERGY INC COM 655044105 1,020 15,000 SH X 1 X NORDSTROM INC COM 655664100 1,108 20,000 SH X 1 X NOVARTIS AG SPONSORED ADR 66987V109 1,170 25,000 SH X 1 X OLD REP INTL CORP COM 680223104 3,494 150,000 SH X 1 X PEPCO HOLDINGS INC COM 713291902 2,099 100,000 SH X 1 X PINNACLE WEST CAP CORP COM 723484101 8,502 200,000 SH X 1 X PROCTER & GAMBLE CO COM 742718109 1,060 20,000 SH X 1 X RECKSON ASSOCS RLTY CORP COM 75621K106 1,471 47,900 SH X 1 X ROHM & HAAS CO COM 775371107 1,200 25,000 SH X 1 X RYDER SYS INC COM 783549108 834 20,000 SH X 1 X 1 SECURITIES AND EXCHANGE COMMISSIONS FORM 13F INFORMATION PREPARED FOR ALLEGHANY CORPORATION AS OF 03/31/05 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) ------------------------- -------------- ---------- -------- ---------- --- ---- ---- ---- ----- ------- ---- ---- ---- SBC COMMUNICATIONS INC COM 78387G103 1,185 50,000 SH X 1 X SCHLUMBERGER LTD COM 806857108 1,410 20,000 SH X 1 X SHURGARD STORAGE CTRS INC COM 82567D104 1,463 35,700 SH X 1 X SIGMA ALDRICH CORP COM 826552101 613 10,000 SH X 1 X SIMON PPTY GROUP INC NEW COM 828806109 1,593 26,300 SH X 1 X SONY CORP ADR NEW 835699307 1,001 25,000 SH X 1 X STATE STR CORP COM 857477103 656 15,000 SH X 1 X TEXAS INSTRS INC COM 882508104 510 20,000 SH X 1 X 3M CO COM 88579Y101 1,714 20,000 SH X 1 X UNIVISION COMMUNICATIONS INC CL A 914906102 554 20,000 SH X 1 X WACHOVIA CORP 2ND NEW COM 929903102 1,018 20,000 SH X 1 X WAL MART STORES INC COM 9331142103 2,004 40,000 SH X 1 X WEYERHAUSER CO COM 962166104 1,370 20,000 SH X 1 X WHIRLPOOL CORP COM 963320106 6,773 100,000 SH X 1 X GRAND TOTAL 620,302 12,421,466 2