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, 2004 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: Cincinnati Insurance Company Address: 6200 South Gilmore Road Fairfield, Ohio 45014 13F File Number: 028-10753 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 the Report on Behalf of Reporting Manager: Name: Kenneth W. Stecher Title: Chief Financial Officer Phone: (513) 870-2626 Signature, Place and Date of Signing: /s/ Kenneth W. Stecher Fairfield, Ohio May 10, 2004 ------------------------------ ----------------- ---------------- 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).) List of other Managers Reporting for this Manager: N/A 1

FORM 13F SUMMARY PAGE Report Summary: Number of Other Included Managers 1 --------- Form 13F Information Table Entry Total: 45 --------- Form 13F Information Table Value Total: 3,012,043 --------- List of Other Included Managers: 01 Cincinnati Financial Corporation 13F File No. 028-10798 --------- 2

Column 2 Column 3 Column 4 Column 5 SH/PRN PUT/CALL Title of Class Cusip FMV(000) Shares ALLIANCE CAPITAL MGMT HLDG LTD PART Common 01855A101 75,388 2,048,600 SH ALLTEL CORP Common 020039103 213,335 4,276,110 SH BB & T CORP Common 054937107 6,665 188,800 SH CAMDEN PROPERTY TRUST Common 133131102 4,495 100,000 SH CHEVRONTEXACO CORPORATION Common 166764100 31,425 358,000 SH CINERGY CORP Common 172474108 43,139 1,055,000 SH COCA COLA COMPANY Common 191216100 5,030 100,000 SH COMMERCIAL NET LEASE REALTY Common 202218103 5,234 265,000 SH CONOCOPHILLIPS Common 20825C104 12,217 175,000 SH DEVELOPERS DIVERSIFIED REALTY Common 251591103 2,020 50,000 SH EQUITABLE RESOURCES INC Common 294549100 13,326 300,000 SH EQUITY RESIDENTIAL PROPS Common 29476L107 12,177 407,934 SH EXXON MOBIL CORPORATION Common 30231G102 262,849 6,320,000 SH FIFTH THIRD BANCORP Common 316773100 781,910 14,121,542 SH FIRST FINANCIAL BANCORP Common 320209109 1,676 90,586 SH FIRST MERIT CORPORATION Common 337915102 27,353 1,050,000 SH FORTUNE BRANDS INC Common 349631101 21,073 275,000 SH GENERAL ELECTRIC CO. Common 369604103 26,705 875,000 SH GENUINE PARTS CO Common 372460105 18,650 570,000 SH GLIMCHER REALTY TRUST Common 379302102 2,710 100,000 SH H J HEINZ COMPANY Common 423074103 11,265 302,100 SH HILLENBRAND INDUSTRIES Common 431573104 39,132 576,400 SH HUNTINGTON BANCSHARES INC Common 446150104 1,406 63,800 SH JEFFERSON PILOT CORP Common 475070108 6,876 125,000 SH JOHNSON & JOHNSON Common 478160104 71,008 1,400,000 SH LINCOLN NATIONAL CORP Common 534187109 10,108 213,600 SH MEDTRONIC INC Common 585055106 9,550 200,000 SH MERCK & COMPANY Common 589331107 120,418 2,725,000 SH MOLEX INC CLASS A Common 608554200 3,908 150,000 SH NATIONAL CITY CORPORATION Common 635405103 335,342 9,425,000 SH NEW PLAN EXCEL RLTY TRUST INC Common 648053106 11,900 435,095 SH PNC FINANCIAL SERVICES GROUP Common 693475105 100,310 1,810,000 SH PFIZER INC Common 717081103 4,907 140,000 SH PIEDMONT NATURAL GAS Common 720186105 63,034 1,493,000 SH PROCTER & GAMBLE CORPORATION Common 742718109 242,797 2,315,000 SH SBC COMMUNICATIONS INC Common 78387G103 7,362 300,000 SH SIMON PROPERTY GROUP INC Common 828806109 11,688 200,000 SH SKY FINANCIAL GROUP INC Common 83080P103 24,005 925,050 SH STANDARD REGISTER CO Common 853887107 2,331 145,400 SH SYSCO CORP Common 871829107 273 7,000 SH TXU CORP Common 873168108 764 26,660 SH TANGER FCTRY OUTLET Common 875465106 9,209 203,200 SH U S BANCORP Common 902973304 84,032 3,039,120 SH WELLS FARGO & CO Common 949746101 78,346 1,382,500 SH WYETH Common 983024100 194,697 5,185,000 SH 3,012,043 65,514,497 3

COLUMN 6 COLUMN 7 COLUMN 8 SHARED NONE ISSUER INVESTMENT DIS OTH MGRS SOLE ALLIANCE CAPITAL MGMT HLDG LTD PART SHARED 01 2,048,600 - ALLTEL CORP SHARED 01 4,276,110 - BB & T CORP SHARED 01 188,800 - CAMDEN PROPERTY TRUST SHARED 01 100,000 - CHEVRONTEXACO CORPORATION SHARED 01 358,000 - CINERGY CORP SHARED 01 1,055,000 - COCA COLA COMPANY SHARED 01 100,000 - COMMERCIAL NET LEASE REALTY SHARED 01 265,000 - CONOCOPHILLIPS SHARED 01 175,000 - DEVELOPERS DIVERSIFIED REALTY SHARED 01 50,000 - EQUITABLE RESOURCES INC SHARED 01 300,000 - EQUITY RESIDENTIAL PROPS SHARED 01 407,934 - EXXON MOBIL CORPORATION SHARED 01 6,320,000 - FIFTH THIRD BANCORP SHARED 01 14,121,542 - FIRST FINANCIAL BANCORP SHARED 01 90,586 - FIRST MERIT CORPORATION SHARED 01 1,050,000 - FORTUNE BRANDS INC SHARED 01 275,000 - GENERAL ELECTRIC CO. SHARED 01 875,000 - GENUINE PARTS CO SHARED 01 570,000 - GLIMCHER REALTY TRUST SHARED 01 100,000 - H J HEINZ COMPANY SHARED 01 302,100 - HILLENBRAND INDUSTRIES SHARED 01 576,400 - HUNTINGTON BANCSHARES INC SHARED 01 63,800 - JEFFERSON PILOT CORP SHARED 01 125,000 - JOHNSON & JOHNSON SHARED 01 1,400,000 - LINCOLN NATIONAL CORP SHARED 01 213,600 - MEDTRONIC INC SHARED 01 200,000 - MERCK & COMPANY SHARED 01 2,725,000 - MOLEX INC CLASS A SHARED 01 150,000 - NATIONAL CITY CORPORATION SHARED 01 9,425,000 - NEW PLAN EXCEL RLTY TRUST INC SHARED 01 435,095 - PNC FINANCIAL SERVICES GROUP SHARED 01 1,810,000 - PFIZER INC SHARED 01 140,000 - PIEDMONT NATURAL GAS SHARED 01 1,493,000 - PROCTER & GAMBLE CORPORATION SHARED 01 2,315,000 - SBC COMMUNICATIONS INC SHARED 01 300,000 - SIMON PROPERTY GROUP INC SHARED 01 200,000 - SKY FINANCIAL GROUP INC SHARED 01 925,050 - STANDARD REGISTER CO SHARED 01 145,400 - SYSCO CORP SHARED 01 7,000 - TXU CORP SHARED 01 26,660 - TANGER FCTRY OUTLET SHARED 01 203,200 - U S BANCORP SHARED 01 3,039,120 - WELLS FARGO & CO SHARED 01 1,382,500 - WYETH SHARED 01 5,185,000 65,514,497 4

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