UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 13F Form 13F COVER PAGE Report for the Calendar Year or Quarter Ended: September 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: Alleghany Corporation Address: 7 Times Square Tower, 17th Floor New York, NY 10036 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: Roger B. Gorham Title: Senior Vice President Phone: 212-752-1356 Signature, Place, and Date of Signing: /s/ Roger B. Gorham New York, NY November 4, 2010 -------------------------------------- ------------------- ------------------ [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: 2 Form 13F Information Table Entry Total: 59 Form 13F Information Table Value Total: $936,568 (thousands) List of Other Included Managers: No. Form 13F File Number Name --- -------------------- ---- 2 RSUI Indemnity Company 3 Alleghany Insurance Holdings LLC SECURITIES AND EXCHANGE COMMISSIONS FORM 13F INFORMATION PREPARED FOR ALLEGHANY CORPORATION AS OF 09/30/10 COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8 ---------------------------- -------------- --------- -------- ------------------- --------------- -------- -------------- INVESTMENT VOTING DISCRETION AUTHORITY MARKET --------------- -------------- VALUE SHRS OR SH/ PUT/ SOLE SHRD OTHER SOLE SHRD NONE NAME OF ISSUER TITLE OF CLASS CUSIP (X 1000) PRIN AMT PRN CALL (A) (B) (C) MANAGER (A) (B) (C) ---------------------------- -------------- --------- -------- ---------- --- ---- ---- ---- ----- -------- ---- ---- ---- COOPER INDUSTRIES PLC SHS G24140108 612 12,500 SH X 2 X AT&T INC COM 00206R102 1,716 60,000 SH X 2 X AGILENT TECHNOLOGIES INC COM 00846U101 1,001 30,000 SH X 2 X ALEXANDER & BALDWIN INC COM 014482103 697 20,000 SH X 2 X AMERICAN EXPRESS CO COM 025816109 1,471 35,000 SH X 2 X APPLIED MATLS INC COM 038222105 818 70,000 SH X 2 X AUTODESK INC COM 052769106 799 25,000 SH X 2 X AUTOMATIC DATA PROCESSING IN COM 053015103 841 20,000 SH X 2 X BARRICK GOLD CORP COM 067901108 9,675 209,000 SH X 1 X BARRICK GOLD CORP COM 067901108 31,986 691,000 SH X 2 X BERKSHIRE HATHAWAY INC DEL CL B 084670207 1,654 20,000 SH X 2 X BOEING CO COM 097023105 998 15,000 SH X 2 X CHUBB CORP COM 171232101 1,710 30,000 SH X 2 X COCA COLA CO COM 191216100 1,756 30,000 SH X 2 X CONOCOPHILLIPS COM 20825C104 4,307 75,000 SH X 1 X CONOCOPHILLIPS COM 20825C104 14,645 255,000 SH X 2 X CONOCOPHILLIPS COM 20825C104 40,201 700,000 SH X 3 X COSTCO WHSL CORP NEW COM 22160K105 1,612 25,000 SH X 2 X COVANTA HLDG CORP COM 22282E102 2 124 SH X 1 X DEERE & CO COM 244199105 2,093 30,000 SH X 2 X DISNEY WALT CO COM DISNEY 254687106 1,489 45,000 SH X 2 X DU PONT EI DE NEMOURS & CO COM 263534109 1,562 35,000 SH X 2 X EMERSON ELEC CO COM 291011104 1,843 35,000 SH X 2 X EXELON CORP COM 30161N101 7,452 175,000 SH X 1 X EXELON CORP COM 30161N101 22,354 525,000 SH X 2 X EXXON MOBIL CORP COM 30231G102 15,448 250,000 SH X 1 X EXXON MOBIL CORP COM 30231G102 48,196 780,000 SH X 2 X EXXON MOBIL CORP COM 30231G102 370,740 6,000,000 SH X 3 X FEDEX CORP COM 31428X106 1,283 15,000 SH X 2 X GENERAL ELECTRIC CO COM 369604103 812 50,000 SH X 2 X GLOBAL INDS LTD COM 379336100 6,486 1,185,707 SH X 1 X GLOBAL INDS LTD COM 379336100 10,311 1,885,000 SH X 2 X HESS CORP COM 42809H107 13,598 230,000 SH X 1 X HESS CORP COM 42809H107 36,654 620,000 SH X 2 X HESS CORP COM 42809H107 8,868 150,000 SH X 3 X HEWLETT PACKARD CO COM 428236103 1,052 25,000 SH X 2 X HOME DEPOT INC COM 437076102 634 20,000 SH X 2 X INTEL CORP COM 458140100 1,632 85,000 SH X 2 X INTERNATIONAL BUSINESS MACHS COM 459200101 1,610 12,000 SH X 2 X INTUIT COM 461202103 657 15,000 SH X 2 X JPMORGAN CHASE & CO COM 46625H100 951 25,000 SH X 2 X JOHNSON AND JOHNSON COM 478160104 1,549 25,000 SH X 2 X 1 SECURITIES AND EXCHANGE COMMISSIONS FORM 13F INFORMATION PREPARED FOR ALLEGHANY CORPORATION AS OF 09/30/10 COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8 ---------------------------- -------------- --------- -------- ------------------- --------------- -------- -------------- INVESTMENT VOTING DISCRETION AUTHORITY MARKET --------------- -------------- VALUE SHRS OR SH/ PUT/ SOLE SHRD OTHER SOLE SHRD NONE NAME OF ISSUER TITLE OF CLASS CUSIP (X 1000) PRIN AMT PRN CALL (A) (B) (C) MANAGER (A) (B) (C) ---------------------------- -------------- --------- -------- ---------- --- ---- ---- ---- ----- -------- ---- ---- ---- KELLOGG CO COM 487836108 1,263 25,000 SH X 2 X LAUDER ESTEE COS INC CL A 518439104 1,581 25,000 SH X 2 X LILLY ELI & CO COM 532457108 1,826 50,000 SH X 2 X LOCKHEED MARTIN CORP COM 539830109 642 9,000 SH X 1 X LOCKHEED MARTIN CORP COM 539830109 1,633 22,919 SH X 2 X LOEWS CORP COM 540424108 947 25,000 SH X 2 X MEDTRONIC INC COM 585055106 1,343 40,000 SH X 2 X MICROSOFT CORP COM 594918104 17,755 725,000 SH X 1 X MICROSOFT CORP COM 594918104 33,306 1,360,000 SH X 2 X MICROSOFT CORP COM 594918104 24,490 1,000,000 SH X 3 X NEWMONT MINING CORP COM 651639106 9,296 148,000 SH X 1 X NEWMONT MINING CORP COM 651639106 34,671 552,000 SH X 2 X NEWS CORP CL A 65248E104 914 70,000 SH X 2 X NOBLE ENERGY INC COM 655044105 1,502 20,000 SH X 2 X NORDSTROM INC COM 655664100 1,116 30,000 SH X 2 X NOVARTIS AG SPONSORED ADR 66987V109 1,442 25,000 SH X 2 X OCCIDENTAL PETE CORP DEL COM 674599105 14,486 185,000 SH X 1 X OCCIDENTAL PETE CORP DEL COM 674599105 42,282 540,000 SH X 2 X OCCIDENTAL PETE CORP DEL COM 674599105 52,852 675,000 SH X 3 X PACCAR INC COM 693718108 963 20,000 SH X 2 X PHILIP MORRIS INTL INC COM 718172109 840 15,000 SH X 2 X PROCTER & GAMBLE CO COM 742718109 1,799 30,000 SH X 2 X SCHLUMBERGER LTD COM 806857108 1,540 25,000 SH X 2 X SEABRIGHT INSURANCE HLDGS IN COM 811656107 443 55,000 SH X 1 X SEABRIGHT INSURANCE HLDGS IN COM 811656107 1,169 145,000 SH X 2 X SEABRIGHT INSURANCE HLDGS IN COM 811656107 4,030 500,000 SH X 3 X SIGMA ALDRICH CORP COM 826552101 1,208 20,000 SH X 2 X STATE STR CORP COM 857477103 565 15,000 SH X 2 X SYSCO CORP COM 871829107 1,141 40,000 SH X 2 X 3M CO COM 88579Y101 1,908 22,000 SH X 2 X US BANCORP DEL COM NEW 902973304 540 25,000 SH X 2 X WAL MART STORES INC COM 931142103 1,873 35,000 SH X 2 X WASHINGTON POST CO CL B 939640108 799 2,000 SH X 2 X WELLS FARGO & CO NEW COM 949746101 628 25,000 SH X 2 X GRAND TOTAL 936,568 21,041,250 2