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, 2013

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                   05/13/13
-----------------------   -------------------------------   --------------------
      [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:                 4
                                          -----------

Form 13F Information Table Entry Total:           64
                                          -----------

Form 13F Information Table Value Total:   $1,891,617
                                          -----------
                                          (thousands)

List of Other Included Managers:

        No. Form 13F File Number     Name

         2  28-10508                 RSUI Indemnity Company

         3  28-06459                 Alleghany Insurance Holdings LLC

         4  28-12262                 Capitol Indemnity Corporation

         5  28-15020                 Transatlantic Reinsurance Company



SECURITIES AND EXCHANGE COMMISSIONS FORM 13F INFORMATION
PREPARED FOR ALLEGHANY CORPORATION
AS OF 3/31/13



        COLUMN 1              COLUMN 2   COLUMN 3 COLUMN 4      COLUMN 5              COLUMN 6             COLUMN 7    COLUMN 8
---------------------------- ---------- --------- -------- ------------------ ---------------------------- -------- ---------------
                                                                                    INVESTMENT                         VOTING
     NAME OF ISSUER           TITLE OF    CUSIP    MARKET   SHRS OR  SH/ PUT/       DISCRETION              OTHER     AUTHORITY
                               CLASS                VALUE   PRIN AMT PRN CALL SOLE SHRD-DEFINED SHRD-OTHER MANAGERS SOLE SHRD NONE
                                                  (X 1000)                     (A)     (B)         (C)              (A)  (B)  (C)
                                                                                        
AGILENT TECHNOLOGIES INC     COM        00846U101   1,259     30,000  SH                            X        2, 3    X
AIR PRODS & CHEMS INC        COM        009158106   4,269     49,000  SH                X                    2, 3    X
AIR PRODS & CHEMS INC        COM        009158106     261      3,000  SH                X                     3      X
AIR PRODS & CHEMS INC        COM        009158106   1,481     17,000  SH                X                    3, 4    X
AIR PRODS & CHEMS INC        COM        009158106  27,530    316,000  SH                X                     5      X
AIRGAS INC                   COM        009363102   1,983     20,000  SH                X                    2, 3    X
AIRGAS INC                   COM        009363102   9,916    100,000  SH                X                     3      X
AIRGAS INC                   COM        009363102     496      5,000  SH                X                    3, 4    X
AIRGAS INC                   COM        009363102   2,479     25,000  SH                X                     5      X
AMERICAN EXPRESS CO          COM        025816109   2,361     35,000  SH                            X        2, 3    X
ANNALY CAP MGMT INC          COM        035710409  95,340  6,000,000  SH                X                            X
APACHE CORP                  COM        037411105  42,669    553,000  SH                X                    2, 3    X
APACHE CORP                  COM        037411105   1,003     13,000  SH                X                     3      X
APACHE CORP                  COM        037411105   5,170     67,000  SH                X                    3, 4    X
APACHE CORP                  COM        037411105 105,478  1,367,000  SH                X                     5      X
APPLE INC                    COM        037833100  23,018     52,000  SH                X                    2, 3    X
APPLE INC                    COM        037833100     775      1,750  SH                X                     3      X
APPLE INC                    COM        037833100   4,427     10,000  SH                X                    3, 4    X
APPLE INC                    COM        037833100 111,211    251,250  SH                X                     5      X
APPLIED MATLS INC            COM        038222105     944     70,000  SH                            X        2, 3    X
AT&T INC                     COM        00206R102   2,201     60,000  SH                            X        2, 3    X
AUTODESK INC                 COM        052769106   1,031     25,000  SH                            X        2, 3    X
AUTOMATIC DATA PROCESSING IN COM        053015103   1,301     20,000  SH                            X        2, 3    X
BERKSHIRE HATHAWAY INC DEL   CL B       084670702   2,084     20,000  SH                            X        2, 3    X
BOEING CO                    COM        097023105  14,337    167,000  SH                X                    2, 3    X
BOEING CO                    COM        097023105   1,843     21,470  SH                            X        2, 3    X
BOEING CO                    COM        097023105  18,286    213,000  SH                X                     3      X
BOEING CO                    COM        097023105   3,692     43,000  SH                X                    3, 4    X
BOEING CO                    COM        097023105  31,078    362,000  SH                X                     5      X
CEDAR FAIR L P               DEPOSITRY
                             UNIT       150185106  34,600    870,000  SH                X                    2, 3    X
CHUBB CORP                   COM        171232101   2,626     30,000  SH                            X        2, 3    X
COCA COLA CO                 COM        191216100   2,426     60,000  SH                            X        2, 3    X
CONOCOPHILLIPS               COM        20825C104  16,227    270,000  SH                X                    2, 3    X
CONOCOPHILLIPS               COM        20825C104   1,803     30,000  SH                            X        2, 3    X
CONOCOPHILLIPS               COM        20825C104   5,529     92,000  SH                X                     3      X
CONOCOPHILLIPS               COM        20825C104   3,967     66,000  SH                X                    3, 4    X
CONOCOPHILLIPS               COM        20825C104  79,452  1,322,000  SH                X                     5      X
COSTCO WHSL CORP NEW         COM        22160K105   2,122     20,000  SH                            X        2, 3    X
CUMMINS INC                  COM        231021106   1,737     15,000  SH                            X        2, 3    X
DEERE & CO                   COM        244199105   2,579     30,000  SH                            X        2, 3    X






                                                                                        
DEVON ENERGY CORP NEW        COM        25179M103   7,899    140,000  SH                X                    2, 3    X
DEVON ENERGY CORP NEW        COM        25179M103   3,554     63,000  SH                X                     3      X
DEVON ENERGY CORP NEW        COM        25179M103   1,805     32,000  SH                X                    3, 4    X
DEVON ENERGY CORP NEW        COM        25179M103  71,371  1,265,000  SH                X                     5      X
DISNEY WALT CO               COM DISNEY 254687106   2,556     45,000  SH                            X        2, 3    X
DU PONT EI DE NEMOURS & CO   COM        263534109   1,721     35,000  SH                            X        2, 3    X
EMERSON ELEC CO              COM        291011104   2,235     40,000  SH                            X        2, 3    X
EXXON MOBIL CORP             COM        30231G102   2,703     30,000  SH                            X        2, 3    X
FEDEX CORP                   COM        31428X106   1,473     15,000  SH                            X        2, 3    X
FREEPORT-MCMORAN COPPER & GO COM        35671D857  37,238  1,125,000  SH                X                    2, 3    X
FREEPORT-MCMORAN COPPER & GO COM        35671D857   3,972    120,000  SH                X                     3      X
FREEPORT-MCMORAN COPPER & GO COM        35671D857  12,413    375,000  SH                X                    3, 4    X
FREEPORT-MCMORAN COPPER & GO COM        35671D857  12,578    380,000  SH                X                     5      X
GOOGLE INC                   COM        38259P508   1,985      2,500  SH                            X        2, 3    X
HESS CORP                    COM        42809H107  42,966    600,000  SH                X                            X
HESS CORP                    COM        42809H107  73,472  1,026,000  SH                X                    2, 3    X
HESS CORP                    COM        42809H107   2,363     33,000  SH                X                     3      X
HESS CORP                    COM        42809H107  18,619    260,000  SH                X                    3, 4    X
HESS CORP                    COM        42809H107  77,410  1,081,000  SH                X                     5      X
HOME DEPOT INC               COM        437076102   1,396     20,000  SH                            X        2, 3    X
INTEL CORP                   COM        458140100  13,974    640,000  SH                X                    2, 3    X
INTEL CORP                   COM        458140100   1,856     85,000  SH                            X        2, 3    X
INTEL CORP                   COM        458140100     917     42,000  SH                X                     3      X
INTEL CORP                   COM        458140100   4,891    224,000  SH                X                    3, 4    X
INTEL CORP                   COM        458140100  23,904  1,094,000  SH                X                     5      X
INTERNATIONAL BUSINESS MACHS COM        459200101   2,560     12,000  SH                            X        2, 3    X
JOHNSON AND JOHNSON          COM        478160104  15,002    184,000  SH                X                    2, 3    X
JOHNSON AND JOHNSON          COM        478160104   2,446     30,000  SH                            X        2, 3    X
JOHNSON AND JOHNSON          COM        478160104     652      8,000  SH                X                     3      X
JOHNSON AND JOHNSON          COM        478160104   3,098     38,000  SH                X                    3, 4    X
JOHNSON AND JOHNSON          COM        478160104  30,166    370,000  SH                X                     5      X
JPMORGAN CHASE & CO          COM        46625H100   1,424     30,000  SH                            X        2, 3    X
KELLOGG CO                   COM        487836108   1,933     30,000  SH                            X        2, 3    X
KOHLS CORP                   COM        500255104   6,781    147,000  SH                X                    2, 3    X
KOHLS CORP                   COM        500255104  34,044    738,000  SH                X                     3      X
KOHLS CORP                   COM        500255104   1,522     33,000  SH                X                    3, 4    X
KOHLS CORP                   COM        500255104  13,009    282,000  SH                X                     5      X
LAUDER ESTEE COS INC         CL A       518439104   1,601     25,000  SH                            X        2, 3    X
LILLY ELI & CO               COM        532457108   2,840     50,000  SH                            X        2, 3    X
LOEWS CORP                   COM        540424108   1,102     25,000  SH                            X        2, 3    X
MCDONALDS CORP               COM        580135101  21,334    214,000  SH                X                    2, 3    X
MCDONALDS CORP               COM        580135101     798      8,000  SH                X                     3      X
MCDONALDS CORP               COM        580135101   3,788     38,000  SH                X                    3, 4    X
MCDONALDS CORP               COM        580135101  28,910    290,000  SH                X                     5      X
MEDTRONIC INC                COM        585055106   2,583     55,000  SH                            X        2, 3    X
MICROSOFT CORP               COM        594918104   2,431     85,000  SH                            X        2, 3    X
NOBLE ENERGY INC             COM        655044105   2,313     20,000  SH                            X        2, 3    X
NORDSTROM INC                COM        655664100   1,657     30,000  SH                            X        2, 3    X
NOVARTIS AG                  SPONSORED
                             ADR        66987V109   1,781     25,000  SH                            X        2, 3    X
OCCIDENTAL PETE CORP DEL     COM        674599105  72,100    920,000  SH                X                    2, 3    X
OCCIDENTAL PETE CORP DEL     COM        674599105   2,978     38,000  SH                X                     3      X
OCCIDENTAL PETE CORP DEL     COM        674599105  18,966    242,000  SH                X                    3, 4    X






                                                                                         
OCCIDENTAL PETE CORP DEL     COM        674599105  58,778    750,000  SH                X                     5      X
OLD REP INTL CORP            COM        680223104  13,854  1,090,000  SH                X                     3      X
ORACLE CORP                  COM        68389X105   1,568     48,500  SH                            X        2, 3    X
PACCAR INC                   COM        693718108   1,517     30,000  SH                            X        2, 3    X
PHILIP MORRIS INTL INC       COM        718172109   1,391     15,000  SH                            X        2, 3    X
PHILLIPS 66                  COM        718546104   4,198     60,000  SH                X                    2, 3    X
PHILLIPS 66                  COM        718546104   1,050     15,000  SH                            X        2, 3    X
PHILLIPS 66                  COM        718546104      70      1,000  SH                X                     3      X
PHILLIPS 66                  COM        718546104   1,120     16,000  SH                X                    3, 4    X
PHILLIPS 66                  COM        718546104  57,833    826,538  SH                X                     5      X
PROCTER & GAMBLE CO          COM        742718109   2,312     30,000  SH                            X        2, 3    X
SCHLUMBERGER LTD             COM        806857108   2,247     30,000  SH                            X        2, 3    X
SIGMA ALDRICH CORP           COM        826552101   1,553     20,000  SH                            X        2, 3    X
SYSCO CORP                   COM        871829107   1,407     40,000  SH                            X        2, 3    X
3M CO                        COM        88579Y101   2,339     22,000  SH                            X        2, 3    X
TIME WARNER CABLE INC        COM        88732J207   5,475     57,000  SH                X                    2, 3    X
TIME WARNER CABLE INC        COM        88732J207     192      2,000  SH                X                     3      X
TIME WARNER CABLE INC        COM        88732J207   1,345     14,000  SH                X                    3, 4    X
TIME WARNER CABLE INC        COM        88732J207  46,781    487,000  SH                X                     5      X
TRONOX LTD                   SHS CL A   Q9235V101  33,875  1,710,000  SH                X                    2, 3    X
TRONOX LTD                   SHS CL A   Q9235V101   1,090     55,000  SH                X                     3      X
TRONOX LTD                   SHS CL A   Q9235V101   9,608    485,000  SH                X                    3, 4    X
TRONOX LTD                   SHS CL A   Q9235V101  39,620  2,000,000  SH                X                     5      X
UNITED PARCEL SERVICE INC    CL B       911312106  36,937    430,000  SH                X                    2, 3    X
UNITED PARCEL SERVICE INC    CL B       911312106   1,460     17,000  SH                X                     3      X
UNITED PARCEL SERVICE INC    CL B       911312106   8,848    103,000  SH                X                    3, 4    X
UNITED PARCEL SERVICE INC    CL B       911312106  12,026    140,000  SH                X                     5      X
US BANCORP DEL               COM NEW    902973304   1,188     35,000  SH                            X        2, 3    X
VISA INC                     COM CL A   92826C839  33,968    200,000  SH                X                            X
VISA INC                     COM CL A   92826C839  64,200    378,000  SH                X                    2, 3    X
VISA INC                     COM CL A   92826C839   2,717     16,000  SH                X                     3      X
VISA INC                     COM CL A   92826C839  18,003    106,000  SH                X                    3, 4    X
VISA INC                     COM CL A   92826C839  44,158    260,000  SH                X                     5      X
WAL MART STORES INC          COM        931142103   2,619     35,000  SH                            X        2, 3    X
WASHINGTON POST CO           CL B       939640108     894      2,000  SH                            X        2, 3    X
WELLS FARGO & CO NEW         COM        949746101   1,295     35,000  SH                            X        2, 3    X

GRAND TOTAL                                     1,891,617 35,022,008