UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                   FORM 13F

                             FORM 13F COVER PAGE

Report for the Calendar Year or Quarter Ended: June 30, 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:GENERAL AMERICAN INVESTORS COMPANY, INC.
Address: 450 Lexington Ave, Suite 3300
         New York, NY 10017

13F File Number: 28-461

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: Eugene S. Stark
Title: Vice-President, Administration
Phone: 212-916-8447
Signature, Place, and Date of Signing:

  Eugene S. Stark   New York, NY   August 03, 2005


Report Type (Check only one.):

[X]    13F HOLDINGS REPORT.

[ ]    13F NOTICE.

[ ]    13F COMBINATION REPORT.







                             FORM 13F SUMMARY PAGE


Report Summary:

Number of Other Included Managers:       0

Form 13F Information Table Entry Total:  63

Form 13F Information Table Value Total:  $1208797406



List of Other Included Managers:

NONE






   COLUMN 1                          COLUMN 2      COLUMN 3  COLUMN 4     COLUMN 5     COLUMN 6  COLUMN 7          COLUMN 8
 --------------                     ---------     ---------  -------- ---------------  -------- ---------     -----------------
                                                             VALUE    SHARES/ SH/ PUT/ INVSTMT   OTHER      ----VOTING AUTHORITY----
  NAME OF ISSUER                 -TITLE OF CLASS- --CUSIP-- x$1000    PRN AMT PRN CALL DSCRETN -MANAGERS-     SOLE   SHARED     NONE
                                                                                                      
Arch Capital Group Ltd.          COMMON           G0450A105    15317   340000 SH       SOLE                 340000        0        0
Adams Express Company            COMMON           006212104     1281    99518 SH       SOLE                  99518        0        0
Aspen Insurance Holdings Limited COMMON           G05384105     1681    61000 SH       SOLE                  61000        0        0
American International Group,Inc COMMON           026874107    20335   350000 SH       SOLE                 350000        0        0
Alkermes, Inc.                   COMMON           01642T108     4495   340000 SH       SOLE                 340000        0        0
American Tower Corporation       COMMON           029912201    14189   675000 SH       SOLE                 675000        0        0
Annuity and Life Re (Holdings),  COMMON           G03910109      375   500000 SH       SOLE                 500000        0        0
Apache Corporation               COMMON           037411105    42959   665000 SH       SOLE                 665000        0        0
Bank of America Corporation      COMMON           060505104    14823   325000 SH       SOLE                 325000        0        0
Bancroft Convertible Fund        COMMON           059695106      369    21088 SH       SOLE                  21088        0        0
Biogen Idec Inc.                 COMMON           09062X103     6890   200000 SH       SOLE                 200000        0        0
Bristol-Myers Squibb Company     COMMON           110122108     5995   240000 SH       SOLE                 240000        0        0
Berkshire Hathaway Inc. Class A  COMMON           084670108    25050      300 SH       SOLE                    300        0        0
Brooks Automation, Inc.          COMMON           114340102     7299   491500 SH       SOLE                 491500        0        0
Central Securities Corporation   COMMON           155123102     2886   119319 SH       SOLE                 119319        0        0
CIENA Corporation                COMMON           171779101     1150   550000 SH       SOLE                 550000        0        0
Costco Wholesale Corporation     COMMON           22160K105    31311   700000 SH       SOLE                 700000        0        0
Cisco Systems, Inc.              COMMON           17275R102    17172   900000 SH       SOLE                 900000        0        0
CEMEX, S.A. de C.V. ADR          COMMON           151290889    48488  1143041 SH       SOLE                1143041        0        0
Cytokinetics, Incorporated       COMMON           23282W100     3817   550000 SH       SOLE                 550000        0        0
Diageo plc                       COMMON           25243Q205    20755   350000 SH       SOLE                 350000        0        0
Dollar General Corporation       COMMON           256669102    10180   500000 SH       SOLE                 500000        0        0
Genentech, Inc.                  COMMON           368710406    29302   365000 SH       SOLE                 365000        0        0
Devon Energy Corporation         COMMON           25179M103    81088  1600000 SH       SOLE                1600000        0        0
EMC Corporation                  COMMON           268648102     4113   300000 SH       SOLE                 300000        0        0
EMCORE Corporation               COMMON           290846104      814   197000 SH       SOLE                 197000        0        0
EOG Resources, Inc.              COMMON           26875P101    34080   600000 SH       SOLE                 600000        0        0
Ethan Allen Interiors Inc.       COMMON           297602104     9215   275000 SH       SOLE                 275000        0        0
Golden West Financial            COMMON           381317106    37662   585000 SH       SOLE                 585000        0        0
Genaera Corporation              COMMON           36867G100      459   270000 SH       SOLE                 270000        0        0
Halliburton Company              COMMON           406216101    25106   525000 SH       SOLE                 525000        0        0
The Home Depot, Inc.             COMMON           437076102    74688  1920000 SH       SOLE                1920000        0        0
Juniper Networks, Inc.           COMMON           48203R104     3777   150000 SH       SOLE                 150000        0        0
Lafarge North America Inc.       COMMON           505862102    10927   175000 SH       SOLE                 175000        0        0
Lamar Advertising Company        COMMON           512815101    21385   500000 SH       SOLE                 500000        0        0
Medtronic, Inc.                  COMMON           585055106    23306   450000 SH       SOLE                 450000        0        0
MedImmune, Inc.                  COMMON           584699102    12158   455000 SH       SOLE                 455000        0        0
MetLife, Inc.                    COMMON           59156R108    16403   365000 SH       SOLE                 365000        0        0
MFA Mortgage Investments, Inc.   COMMON           55272X102     6146   825000 SH       SOLE                 825000        0        0
Millennium Pharmaceuticals, Inc. COMMON           599902103     1112   120000 SH       SOLE                 120000        0        0
Molex Incorporated Class A       COMMON           608554200    16788   715000 SH       SOLE                 715000        0        0
Montpelier Re Holdings Ltd.      COMMON           G62185106     3804   110000 SH       SOLE                 110000        0        0
Microsoft Corporation            COMMON           594918104    37881  1525000 SH       SOLE                1525000        0        0
M&T Bank Corporation             COMMON           55261F104    32600   310000 SH       SOLE                 310000        0        0
North Fork Bancorporation, Inc.  COMMON           659424105     8427   300000 SH       SOLE                 300000        0        0
Annaly Mortgage Management, Inc. COMMON           035710409     4483   250000 SH       SOLE                 250000        0        0
NetIQ Corporation                COMMON           64115P102     3660   323000 SH       SOLE                 323000        0        0
PepsiCo, Inc.                    COMMON           713448108     8090   150000 SH       SOLE                 150000        0        0
Pfizer Inc                       COMMON           717081103    35165  1275000 SH       SOLE                1275000        0        0
PartnerRe Ltd.                   COMMON           G6852T105    27379   425000 SH       SOLE                 425000        0        0
Patterson-UTI Energy, Inc.       COMMON           703481101    18090   650000 SH       SOLE                 650000        0        0
Everest Re Group, Ltd.           COMMON           G3223R108    54405   585000 SH       SOLE                 585000        0        0
Reinsurance Group of America,    COMMON           759351109    15116   325000 SH       SOLE                 325000        0        0
Republic Services, Inc.          COMMON           760759100    42312  1175000 SH       SOLE                1175000        0        0
Royce Value Trust                COMMON           780910105     2039   108001 SH       SOLE                 108001        0        0
SunTrust Banks, Inc.             COMMON           867914103    14448   200000 SH       SOLE                 200000        0        0
The TJX Companies, Inc.          COMMON           872540109    60875  2500000 SH       SOLE                2500000        0        0
Talisman Energy Inc.             COMMON           87425E103    24233   645000 SH       SOLE                 645000        0        0
Total S.A. ADR                   COMMON           89151E109    38561   330000 SH       SOLE                 330000        0        0
Transatlantic Holdings, Inc.     COMMON           893521104    14374   257500 SH       SOLE                 257500        0        0
Unocal Corporation               COMMON           915289102    21141   325000 SH       SOLE                 325000        0        0
VeriSign, Inc.                   COMMON           92343E102     3839   133500 SH       SOLE                 133500        0        0
Wal-Mart Stores, Inc.            COMMON           931142103    32535   675000 SH       SOLE                 675000        0        0