UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 Form 13F FORM 13F COVER PAGE Report for the Calendar Year or Quarter Ended: September 30, 2004 Institutional Investment Manager Filing this Report: Name: General American Investors Company, Inc. Address: 450 Lexington Avenue, 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: Name: Eugene L. DeStaebler, Jr. Title: Vice-President, Administration Phone: 212-916-8400 Signature, Place and Date of Signing: Eugene L. DeStaebler, Jr. New York, NY October 26, 2004 Report Type (Check only one.): [x] 13F HOLDINGS REPORT [ ] 13F NOTICE [ ] 13F COMBINATION REPORT List of Other Managers Reporting for this Manager: NONE I am signing this report as required by the Securities Exchange Act of 1934. FORM 13F SUMMARY PAGE Report Summary: Number of Other Included Managers: 0 Form 13F Information Table Entry Total: 58 Form 13F Information Table Value Total: $1,049,614,286 NAME OF ISSUER TITLE CUSIP FAIR SHARES OR INVEST. DISC. OTHER VOTING AUTHORITY OF NUMBER MARKET PRINCIPAL SH/ SHARED MGRS. CLASS VALUE AMOUNT PRN SOLE SHARED OTHER SOLE SHARED NONE (A) (B) (C) (A) (B) (C) ---------------------------------------------------------------------------------------------------------------------------------- Adams Express Company COMMON 006212104 1,193,061 94,090 N X 94,090 American International Gro COMMON 026874107 18,017,350 265,000 N X 265,000 Alkermes, Inc. COMMON 01642T108 3,923,600 340,000 N X 340,000 American Tower Corporation COMMON 029912201 8,442,500 550,000 N X 550,000 Annuity and Life Re (Holdi COMMON G03910109 250,000 625,000 N X 625,000 Apache Corporation COMMON 037411105 19,542,900 390,000 N X 390,000 Bank of America Corporatio COMMON 060505104 15,945,440 368,000 N X 368,000 Baxter International Inc. COMMON 071813109 26,532,000 825,000 N X 825,000 Bancroft Convertible Fund COMMON 059695106 386,642 21,070 N X 21,070 Biogen Idec Inc. COMMON 09062X103 15,292,500 250,000 N X 250,000 Bristol-Myers Squibb Compa COMMON 110122108 7,101,000 300,000 N X 300,000 Berkshire Hathaway Inc. COMMON 084670108 25,995,000 300 N X 300 Brooks Automation, Inc. COMMON 114340102 6,954,725 491,500 N X 491,500 Central Securities Corpora COMMON 155123102 2,515,140 113,040 N X 113,040 CIENA Corporation COMMON 171779101 1,089,000 550,000 N X 550,000 Costco Wholesale Corporati COMMON 22160K105 29,057,000 700,000 N X 700,000 Cox Communications, Inc. - COMMON 224044107 20,540,600 620,000 N X 620,000 Cisco Systems, Inc. COMMON 17275R102 16,290,000 900,000 N X 900,000 CEMEX, S.A. de C.V. COMMON 151290889 26,733,000 950,000 N X 950,000 Diageo plc COMMON 25243Q205 17,650,500 350,000 N X 350,000 Genentech, Inc. COMMON 368710406 29,355,200 560,000 N X 560,000 Devon Energy Corporation COMMON 25179M103 56,808,000 800,000 N X 800,000 EMC Corporation COMMON 268648102 3,462,000 300,000 N X 300,000 EMCORE Corporation COMMON 290846104 388,090 197,000 N X 197,000 El Paso Corporation 0% CONV C 28336LAC3 11,475,000 22,500,000 N X 22,500,000 Ethan Allen Interiors Inc. COMMON 297602104 9,556,250 275,000 N X 275,000 Golden West Financial COMMON 381317106 36,058,750 325,000 N X 325,000 Genaera Corporation COMMON 36867G100 1,055,700 270,000 N X 270,000 Genta Incorporated COMMON 37245M207 1,008,750 375,000 N X 375,000 Halliburton Company COMMON 406216101 20,214,000 600,000 N X 600,000 The Home Depot, Inc. COMMON 437076102 75,264,000 1,920,000 N X 1,920,000 Juniper Networks, Inc. COMMON 48203R104 3,540,000 150,000 N X 150,000 Lamar Advertising Company COMMON 512815101 20,805,000 500,000 N X 500,000 Medtronic, Inc. COMMON 585055106 23,355,000 450,000 N X 450,000 MedImmune, Inc. COMMON 584699102 10,783,500 455,000 N X 455,000 MetLife, Inc. COMMON 59156R108 16,812,750 435,000 N X 435,000 MFA Mortgage Investments, COMMON 55272X102 7,828,500 850,000 N X 850,000 Millennium Pharmaceuticals COMMON 599902103 1,640,400 120,000 N X 120,000 Molex Incorporated Class A COMMON 608554200 18,818,800 715,000 N X 715,000 Montpelier Re Holdings Ltd COMMON G62185106 6,419,000 175,000 N X 175,000 Microsoft Corporation COMMON 594918104 42,166,250 1,525,000 N X 1,525,000 M&T Bank Corporation COMMON 55261F104 31,581,000 330,000 N X 330,000 Annaly Mortgage Management COMMON 035710409 13,275,750 775,000 N X 775,000 NetIQ Corporation COMMON 64115P102 6,666,100 623,000 N X 623,000 PepsiCo, Inc. COMMON 713448108 7,297,500 150,000 N X 150,000 Pfizer Inc COMMON 717081103 40,545,000 1,325,000 N X 1,325,000 PartnerRe Ltd. COMMON G6852T105 27,345,000 500,000 N X 500,000 Everest Re Group, Ltd. COMMON G3223R108 48,314,500 650,000 N X 650,000 Reinsurance Group of Ameri COMMON 759351109 18,334,000 445,000 N X 445,000 Republic Services, Inc. COMMON 760759100 34,968,000 1,175,000 N X 1,175,000 Royce Value Trust COMMON 780910105 1,812,580 100,867 N X 100,867 SunTrust Banks, Inc. COMMON 867914103 14,434,050 205,000 N X 205,000 The TJX Companies, Inc. COMMON 872540109 55,100,000 2,500,000 N X 2,500,000 Total S.A. ADR COMMON 89151E109 25,235,990 247,000 N X 247,000 Transatlantic Holdings, In COMMON 893521104 15,285,938 281,250 N X 281,250 Unocal Corporation COMMON 915289102 8,600,000 200,000 N X 200,000 VeriSign, Inc. COMMON 92343E102 4,641,980 233,500 N X 233,500 Wal-Mart Stores, Inc. COMMON 931142103 35,910,000 675,000 N X 675,000