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, 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 May 6, 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: 65 Form 13F Information Table Value Total: $848,909 (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 03/31/10 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) ---------------------------- -------------- --------- -------- ---------- --- ---- ---- ---- ----- -------- ---- ---- ---- AT&T INC COM 00206R102 1,550 60,000 SH X 2 X AGILENT TECHNOLOGIES INC COM 00846U101 1,032 30,000 SH X 2 X ALEXANDER & BALDWIN INC COM 014482103 661 20,000 SH X 2 X AMERICAN EXPRESS CO COM 025816109 1,444 35,000 SH X 2 X APACHE CORP COM 037411105 7,612 75,000 SH X 1 X APACHE CORP COM 037411105 22,838 225,000 SH X 2 X APPLIED MATLS INC COM 038222105 943 70,000 SH X 2 X AUTODESK INC COM 052769106 881 30,000 SH X 2 X AUTOMATIC DATA PROCESSING IN COM 053015103 889 20,000 SH X 2 X BARRICK GOLD CORP COM 067901108 8,013 209,000 SH X 1 X BARRICK GOLD CORP COM 067901108 26,493 691,000 SH X 2 X BERKSHIRE HATHAWAY INC DEL CL B 084670207 1,625 20000 SH X 2 X BOEING CO COM 097023105 1,089 15,000 SH X 2 X CHUBB CORP COM 171232101 1,556 30,000 SH X 2 X COCA COLA CO COM 191216100 1,650 30,000 SH X 2 X CONOCOPHILLIPS COM 20825C104 13,816 270,000 SH X 1 X CONOCOPHILLIPS COM 20825C104 33,772 660,000 SH X 2 X CONOCOPHILLIPS COM 20825C104 35,819 700,000 SH X 3 X COSTCO WHSL CORP NEW COM 22160K105 1,493 25,000 SH X 2 X DEERE & CO COM 244199105 1,784 30,000 SH X 2 X DEVON ENERGY CORP NEW COM 25179M103 8,054 125,000 SH X 1 X DEVON ENERGY CORP NEW COM 25179M103 24,161 375,000 SH X 2 X DISNEY WALT CO COM DISNEY 254687106 1,571 45,000 SH X 2 X DOMINION RES INC VA NEW COM 25746U109 2,055 50,000 SH X 1 X DOMINION RES INC VA NEW COM 25746U109 6,167 150,000 SH X 2 X DU PONT EI DE NEMOURS & CO COM 263534109 1,303 35,000 SH X 2 X EMERSON ELEC CO COM 291011104 1,762 35,000 SH X 2 X EXELON CORP COM 30161N101 4,162 95,000 SH X 1 X EXELON CORP COM 30161N101 13,362 305,000 SH X 2 X EXXON MOBIL CORP COM 30231G102 2,009 30,000 SH X 2 X EXXON MOBIL CORP COM 30231G102 267,920 4,000,000 SH X 3 X FPL GROUP INC COM 302571104 5,075 105,000 SH X 1 X FPL GROUP INC COM 302571104 12,324 255,000 SH X 2 X FEDEX CORP COM 31428X106 1,401 15,000 SH X 2 X GENERAL ELECTRIC CO COM 369604103 1,365 75,000 SH X 2 X GLOBAL INDS LTD COM 379336100 8,397 1,308,000 SH X 1 X GLOBAL INDS LTD COM 379336100 18,567 2,892,000 SH X 2 X HESS CORP COM 42809H107 14,073 225,000 SH X 1 X HESS CORP COM 42809H107 39,094 625,000 SH X 2 X HESS CORP COM 42809H107 9,383 150,000 SH X 3 X HOME DEPOT INC COM 437076102 647 20,000 SH X 2 X INTEL CORP COM 458140100 1,895 85,000 SH X 2 X INTERNATIONAL BUSINESS MACHS COM 459200101 1,539 12,000 SH X 2 X INTUIT COM 461202103 687 20,000 SH X 2 X JPMORGAN CHASE & CO COM 46625H100 1,119 25,000 SH X 2 X JOHNSON AND JOHNSON COM 478160104 1,630 25,000 SH X 2 X KELLOGG CO COM 487836108 1,336 25,000 SH X 2 X LAUDER ESTEE COS INC CL A 518439104 1,622 25,000 SH X 2 X LILLY ELI & CO COM 532457108 1,811 50,000 SH X 2 X LOCKHEED MARTIN CORP COM 539830109 11,235 135,000 SH X 1 X LOCKHEED MARTIN CORP COM 539830109 22,053 265,000 SH X 2 X LOEWS CORP COM 540424108 746 20,000 SH X 2 X MARRIOTT INTL INC NEW CL A 571903202 1,115 35,382 SH X 2 X MEDTRONIC INC COM 585055106 1,801 40,000 SH X 2 X MICROSOFT CORP COM 594918104 3,954 135,000 SH X 1 X MICROSOFT CORP COM 594918104 13,179 450,000 SH X 2 X NEWMONT MINING CORP COM 651639106 7,538 148,000 SH X 1 X NEWMONT MINING CORP COM 651639106 28,113 552,000 SH X 2 X NEWS CORP CL A 65248E104 1,009 70,000 SH X 2 X NOBLE ENERGY INC COM 655044105 1,460 20,000 SH X 2 X NORDSTROM INC COM 655664100 1,226 30,000 SH X 2 X NOVARTIS AG SPONSORED ADR 66987V109 1,353 25,000 SH X 2 X NUSTAR ENERGY LP UNIT COM 67058H102 3,567 59,000 SH X 1 X NUSTAR ENERGY LP UNIT COM 67058H102 5,501 91,000 SH X 2 X OCCIDENTAL PETE CORP DEL COM 674599105 3,382 40,000 SH X 1 X 1 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) ---------------------------- -------------- --------- -------- ---------- --- ---- ---- ---- ----- -------- ---- ---- ---- OCCIDENTAL PETE CORP DEL COM 674599105 9,299 110,000 SH X 2 X OCCIDENTAL PETE CORP DEL COM 674599105 29,589 350,000 SH X 3 X OLD REP INTL CORP COM 680223104 12,680 1,000,000 SH X 3 X PLAINS EXPL& PRODTN CO COM 726505100 8,577 286,000 SH X 1 X PLAINS EXPL& PRODTN CO COM 726505100 22,313 744,000 SH X 2 X PROCTER & GAMBLE CO COM 742718109 1,898 30,000 SH X 2 X SCHLUMBERGER LTD COM 806857108 1,587 25,000 SH X 2 X SEABRIGHT INSURANCE HLDGS IN COM 811656107 1,431 130,000 SH X 3 X SIGMA ALDRICH CORP COM 826552101 1,073 20,000 SH X 2 X STATE STR CORP COM 857477103 677 15,000 SH X 2 X SYSCO CORP COM 871829107 1,180 40,000 SH X 2 X 3M CO COM 88579Y101 1,839 22,000 SH X 2 X TRICO MARINE SERVICES INC COM NEW 896106200 835 360,000 SH X 1 X TRICO MARINE SERVICES INC COM NEW 896106200 2,007 865,000 SH X 2 X US BANCORP DEL COM NEW 902973304 647 25,000 SH X 2 X WAL MART STORES INC COM 931142103 1,946 35,000 SH X 2 X WASHINGTON POST CO CL B 939640108 888 2,000 SH X 2 X WELLS FARGO & CO NEW COM 949746101 622 20,000 SH X 2 X WILLIAMS CO INC DEL COM 969457100 7,854 340,000 SH X 1 X WILLIAMS CO INC DEL COM 969457100 13,398 580,000 SH X 2 X WILLIAMS CO INC DEL COM 969457100 1,848 80,000 SH X 3 X ZENITH NATL INS CORP COM 989390109 38 1,000 SH X 3 X -------- ---------- GRAND TOTAL 848,909 21,622,382 ======== ========== 2