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, 2007 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: Peter R. Sismondo Title: Vice President Phone: 212-752-1356 Signature, Place, and Date of Signing: /s/ Peter R. Sismondo New York, NY November 6, 2007 -------------------------------------------------------------------------------- [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: 3 Form 13F Information Table Entry Total: 70 Form 13F Information Table Value Total: $1,191,800 (thousands) List of Other Included Managers: No. Form 13F File Number Name 2 RSUI Indemnity Company 3 Capitol Indemnity Corporation 4 Alleghany Insurance Holdings LLC SECURITIES AND EXCHANGE COMMISSIONS FORM 13F INFORMATION PREPARED FOR ALLEGHANY CORPORATION AS OF 09/30/07 COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8 INVESTMENT VOTING MARKET DISCRETION AUTHORITY 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) PLATINUM UNDERWRITER HLDGS L COM G7127P100 14,384 400,000 SH X 4 X UBS AG SHS NEW H98231338 12,780 240,000 SH X 2 X UBS AG SHS NEW H98231338 8,520 160,000 SH X 3 X AT&T INC COM 00206R102 1,692 40,000 SH X 4 X AGILENT TECHNOLOGIES INC COM 00846U101 1,106 30,000 SH X 4 X ALEXANDER & BALDWIN INC COM 014482103 1,003 20,000 SH X 4 X AMERICAN EXPRESS CO COM 025816109 1,633 27,500 SH X 4 X AMERICAN INTL GROUP INC COM 026874107 1,353 20,000 SH X 4 X ANADARKO PETE CORP COM 032511107 20,156 375,000 SH X 2 X ANADARKO PETE CORP COM 032511107 12,998 250,000 SH X 3 X APACHE CORP COM 037411105 43,904 487,500 SH X 2 X APACHE CORP COM 037411105 14,635 162,500 SH X 3 X APPLERA CORP COM AP BIO GRP 038080103 1,732 50,000 SH X 4 X APPLIED MATLS INC COM 038222105 1,035 50,000 SH X 4 X AUTODESK INC COM 052769106 1,499 30,000 SH X 4 X AUTOMATIC DATA PROCESSING IN COM 053015103 919 20,000 SH X 4 X BELO CORP COM SER A 080555105 868 50,000 SH X 4 X BERKSHIRE HATHAWAY INC DEL CL B 084670207 1,581 400 SH X 4 X BOEING CO COM 097023105 1,575 15,000 SH X 4 X BURLINGTON NORTHN SANTA FE C COM 12189T104 405,850 5,000,000 SH X 1 X CATERPILLAR INC DEL COM 149123101 1,961 25,000 SH X 4 X CHEVRON CORP NEW COM 166764100 1,872 20,000 SH X 1 X CHEVRON CORP NEW COM 166764100 38,836 415,000 SH X 2 X CHEVRON CORP NEW COM 166764100 14,505 155,000 SH X 3 X CHEVRON CORP NEW COM 166764100 10,294 110,000 SH X 4 X CHUBB CORP COM 171232101 1,609 30,000 SH X 4 X CIMAREX ENERGY CO COM 171798101 10,058 270,000 SH X 2 X CIMAREX ENERGY CO COM 171798101 2,235 60,000 SH X 3 X COCA COLA CO COM 191216100 1,437 25,000 SH X 4 X COMMERCE BANCORP INC NJ COM 200519106 9,191 237,000 SH X 2 X COMMERCE BANCORP INC NJ COM 200519106 504 13,000 SH X 3 X CONOCOPHILLIPS COM 20825C104 1,755 20,000 SH X 1 X CONOCOPHILLIPS COM 20825C104 28,086 320,000 SH X 2 X CONOCOPHILLIPS COM 20825C104 15,799 180,000 SH X 3 X CONOCOPHILLIPS COM 20825C104 44,763 510,000 SH X 4 X COSTCO WHSL CORP NEW COM 22160K105 1,841 30,000 SH X 4 X DARWIN PROFESSIONAL UNDERWRI COM 237502109 202,416 9,371,096 SH X 4 X DEERE & CO COM 244199105 2,226 15,000 SH X 4 X DEVON ENERGY CORP NEW COM 25179M103 46,800 562,500 SH X 2 X DEVON ENERGY CORP NEW COM 25179M103 15,600 187,500 SH X 3 X SECURITIES AND EXCHANGE COMMISSIONS FORM 13F INFORMATION PREPARED FOR ALLEGHANY CORPORATION AS OF 09/30/07 COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8 INVESTMENT VOTING MARKET DISCRETION AUTHORITY 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) DISNEY WALT CO COM DISNEY 254687106 1,548 45,000 SH X 4 X DOW CHEM CO COM 260543103 861 20,000 SH X 4 X DU PONT EI DE NEMOURS & CO COM 263534109 1,487 30,000 SH X 4 X EXXON MOBIL CORP COM 30231G102 2,777 30,000 SH X 4 X FEDEX CORP COM 31428X106 1,571 15,000 SH X 4 X FIFTH THIRD BANCOP COM 316773100 678 20,000 SH X 4 X GENERAL ELECTRIC CO COM 369604103 8,073 195,000 SH X 2 X GENERAL ELECTRIC CO COM 369604103 5,382 130,000 SH X 3 X GENERAL ELECTRIC CO COM 369604103 1,863 45,000 SH X 4 X HSBC HLDGS PLC SPON ADR NEW 404280406 18,520 200,000 SH X 2 X HSBC HLDGS PLC SPON ADR NEW 404280406 9,260 100,000 SH X 3 X HOME DEPOT INC COM 437076102 649 20,000 SH X 4 X INTEL CORP COM 458140100 1,810 70,000 SH X 4 X INTERNATIONAL BUSINESS MACHS COM 459200101 1,414 12,000 SH X 4 X INTUIT COM 461202103 606 20,000 SH X 4 X JOHNSON AND JOHNSON COM 478160104 1,314 20,000 SH X 4 X KELLOGG COM 487836108 1,120 20,000 SH X 4 X KRAFT FOODS INC CL A 50075N104 11,043 320,000 SH X 2 X KRAFT FOODS INC CL A 50075N104 3,251 94,200 SH X 3 X LAUDER ESTEE COS INC CL A 518439104 1,062 25,000 SH X 4 X LIBERTY MEDIA HLDG CORP CAP COM SER A 53071M302 687 5,500 SH X 4 X LILLY ELI & CO COM 532457108 1,708 30,000 SH X 4 X LINCOLN NATIONAL CORP IND COM 534187109 1,185 17,963 SH X 4 X MANPOWER INC COM 56418H100 965 15,000 SH X 4 X MCCLATCHY CO COM 579489105 599 30,000 SH X 4 X MEDTRONIC INC COM 585055106 1,692 30,000 SH X 4 X MICROSOFT CORP COM 594918104 2,062 70,000 SH X 4 X MILLIPORE CORP COM 601073109 1,516 20,000 SH X 4 X NEWS CORP CL A 65248E104 1,539 70,000 SH X 4 X NOBLE ENERGY INC COM 655044105 2,101 30,000 SH X 4 X NORDSTROM INC COM 655664100 1,407 30,000 SH X 4 X NOVARTIS AG SPONSORED ADR 66987V109 1,374 25,000 SH X 4 X PFIZER INC COM 717081103 8,673 355,000 SH X 2 X PFIZER INC COM 717081103 5,375 220,000 SH X 3 X PROCTER & GAMBLE CO COM 742718109 15,139 215,227 SH X 2 X PROCTER & GAMBLE CO COM 742718109 10,129 144,000 SH X 3 X PROCTER & GAMBLE CO COM 742718109 2,110 30,000 SH X 4 X SCHLUMBERGER LTD COM 806857108 2,625 25,000 SH X 4 X SIGMA ALDRICH CORP COM 826552101 1,462 30,000 SH X 4 X SONY CORP ADR NEW 835699307 1,202 25,000 SH X 4 X STATE STR CORP COM 857477103 1,022 15,000 SH X 4 X SECURITIES AND EXCHANGE COMMISSIONS FORM 13F INFORMATION PREPARED FOR ALLEGHANY CORPORATION AS OF 09/30/07 COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8 INVESTMENT VOTING MARKET DISCRETION AUTHORITY 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) SYSCO CORP COM 871829107 1,068 30,000 SH X 4 X TEXAS INSTRS INC COM 882508104 732 20,000 SH X 4 X 3M CO COM 88579Y101 2,059 22,000 SH X 4 X VALERO ENERGY CORP NEW COM 91913Y100 14,108 210,000 SH X 2 X VALERO ENERGY CORP NEW COM 91913Y100 9,405 140,000 SH X 3 X WACHOVIA CORP 2ND NEW COM 929903102 18,806 375,000 SH X 2 X WACHOVIA CORP 2ND NEW COM 929903102 1,755 35,000 SH X 4 X WAL MART STORES INC COM 931142103 1,746 40,000 SH X 4 X WASHINGTON POST CO CL B 939640108 803 1,000 SH X 4 X WEYERHAUSER CO COM 962166104 1,446 20,000 SH X 4 X GRAND TOTAL 1,191,800 23,740,886