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, 2002 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: Aon Advisors, Inc. Address: 200 East Randolph Street Chicago, IL 60601 Name of additional disclosed party: Name: Aon Corporation Address: 200 East Randolph Street Chicago, IL 60601 Form 13F File Number: 28-2005 28-2401 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: Michael A. Conway Title: President Phone: (312) 381-3330 Signature, Place, and Date of Signing: /s/ Michael A. Conway Chicago, IL May 14, 2002 ---------------------------- ----------------------- ----------------- [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: 0 Form 13F Information Table Entry Total: 179 Form 13F Information Table Value Total: $432,709 (thousands) List of Other Included Managers Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report. [If there are no entries in this list, state "NONE" and omit the column headings and list entries] No. Form 13F File Number Name NONE FORM 13F INFORMATION TABLE NAME OF ISSUER TITLE OF CLASS CUSIP MARKET VALUE PAR SHARES ITEM:6 ITEM:7 ITEM:8 ACM GOVT OPPOR FUND INC. Common Stock 000918102 39,991,917 4,655,636 X X AOL TIME WARNER Common Stock 00184A105 4,637,316 196,081 X X AT&T CORP. Common Stock 001957109 157,022 10,001 X X AT&T WIRELESS SERVICES Common Stock 00209A106 549,136 61,356 X X ABBOTT LABORATORIES Common Stock 002824100 1,578,000 30,000 X X ALCOA, INC. Common Stock 013817101 2,264,400 60,000 X X ALLIED WASTE INDUSTRIES INC Common Stock 019589308 1,495,234 115,018 X X ALLTEL CORP. Common Stock 020039103 2,499,750 45,000 X X AMERICAN INTERNATIONAL GROUP Common Stock 026874107 8,682,843 120,361 X X AMGEN, INC. Common Stock 031162100 3,031,744 50,800 X X ANDREW CORPORATION Common Stock 034425108 1,422,050 85,000 X X ANHEUSER-BUSCH COMPANIES INC Common Stock 035229103 3,915,000 75,000 X X AON FUNDS Common Stock 036912889 79,849,467 7,969,009 X X APACHE CORP. Common Stock 037411105 1,001,088 17,600 X X BP AMOCO PLC Common Stock 055622104 3,345,300 63,000 X X BIOGEN Common Stock 090597105 1,373,680 28,000 X X BOLDER TECHNOLOGIES CORP. Common Stock 097519102 61 76,595 X X BRISTOL MYERS SQUIBB Common Stock 110122108 2,348,420 58,000 X X BURLINGTON NORTHERN/SANTA FE Common Stock 12189T104 1,418,460 47,000 X X CSX CORPORATION Common Stock 126408103 2,667,700 70,000 X X CVS CORPORATION Common Stock 126650100 1,373,200 40,000 X X CARDINAL HEALTH INC. Common Stock 14149Y108 4,076,175 57,500 X X CARNIVAL CORP Common Stock 143658102 1,959,000 60,000 X X CHEVRONTEXACO CORP Common Stock 166764100 3,520,530 39,000 X X CISCO SYSTEMS Common Stock 17275R102 1,083,520 64,000 X X CITIGROUP INC. Common Stock 172967101 5,304,236 107,113 X X CITRIX SYSTEMS INC Common Stock 177376100 864,000 50,000 X X CLEAR CHANNEL COMM Common Stock 184502102 4,338,644 84,393 X X COCA COLA CO Common Stock 191216100 3,396,900 65,000 X X COLGATE PALMOLIVE CO Common Stock 194162103 2,360,295 41,300 X X COMPAQ COMPUTER Common Stock 204493100 313,500 30,000 X X COMVERSE TECHNOLOGY,INC Common Stock 205862402 443,450 35,000 X X CONCORD EFS INC Common Stock 206197105 997,500 30,000 X X CONSECO CONVERTIBLE SEC. FUND Common Stock 20846T672 981,041 103,159 X X CORNING INC. Common Stock 219350105 419,100 55,000 X X DRS TECHNOLOGIES, INC. Common Stock 23330X100 41,450 1,000 X X DEAN FOODS Common Stock 242370104 990,720 13,084 X X DEERE & CO Common Stock 244199105 2,186,400 48,000 X X DELL COMPUTER CORP Common Stock 247025109 2,916,487 111,700 X X DELUXE CORP Common Stock 248019101 855,810 18,500 X X DEVON ENERGY Common Stock 25179M103 2,413,500 50,000 X X DIGITAL RIVER INC Common Stock 25388B104 444,300 30,000 X X THE WALT DISNEY CO. Common Stock 254687106 2,308,000 100,000 X X DIVINE INTERVENTURES Common Stock 255402109 833,335 1,666,669 X X DOW CHEMICAL Common Stock 260543103 1,734,160 53,000 X X DUKE REALTY CORP. Common Stock 264411505 390,003 15,000 X X EMC CORP./MASS Common Stock 268648102 655,600 55,000 X X EASTMAN CHEMICAL Common Stock 277432100 3,171,350 65,000 X X EMERSON ELECTRIC CO. Common Stock 291011104 2,754,720 48,000 X X ENGINEERED SUPPORT SYSTEMS INC Common Stock 292866100 555,000 12,000 X X EQUITY OFFICE PROPERTIES TRUST Common Stock 294741103 581,009 19,373 X X EXXON MOBIL CORP Common Stock 30231G102 5,040,713 115,006 X X FEDERAL HOME LOAN MTGE CORP Common Stock 313400301 1,001,246 15,800 X X FEDERAL NATIONAL MORTGAGE ASSN Common Stock 313586109 5,807,276 72,700 X X FIBERMARK INC Common Stock 315646109 197,835 32,700 X X FIRST DATA CORPORATION Common Stock 319963104 1,804,068 20,677 X X FIRST FEDERAL SAVINGS BANK Common Stock 33761K105 206,955 7,161 X X FORD MOTOR COMPANY Common Stock 345370860 3,628,822 220,062 X X FOUNDRY NETWORKS IN Common Stock 35063R100 100,660 14,000 X X FOX ENTERTAINMENT GRP INC-A Common Stock 35138T107 520,300 22,000 X X GENERAL ELECTRIC Common Stock 369604103 7,045,693 188,136 X X GENTEX CORP Common Stock 371901109 592,600 20,000 X X GENZYME CORP. Common Stock 372917104 869,033 19,900 X X GEORGIA-PACIFIC CORP Common Stock 373298108 2,006,650 67,000 X X GIBRALTAR STEEL CO. Common Stock 37476F103 130,560 6,000 X X W.W. GRAINGER INC. Common Stock 384802104 2,249,200 40,000 X X HCA INC Common Stock 404119109 1,763,200 40,000 X X HRPT PROPERTIES, INC Common Stock 40426W101 1,820,700 202,300 X X JOHN HANCOCK FINANCIAL SVCS Common Stock 41014S106 146,993 3,849 X X HARTMARX Common Stock 417119104 212,310 101,100 X X HELMERICH AND PAYNE INC. Common Stock 423452101 408,918 10,200 X X HEWLETT PACKARD CO. Common Stock 428236103 1,309,620 73,000 X X HOME DEPOT INC Common Stock 437076102 3,551,495 73,061 X X HONEYWELL INTERNATIONAL INC. Common Stock 438516106 1,856,095 48,500 X X ILLINOIS TOOL WORKS INC. Common Stock 452308109 2,894,000 40,000 X X INTEL CORPORATION Common Stock 458140100 2,615,260 86,000 X X INT'L BUSINESS MACHINES Common Stock 459200101 5,616,000 54,000 X X INTERNATIONAL PAPER COMPANY Common Stock 460146103 903,210 21,000 X X JOHNSON & JOHNSON Common Stock 478160104 7,828,553 120,532 X X KELLOGG CO. Common Stock 487836108 1,074,240 32,000 X X KROGER Common Stock 501044101 2,091,195 94,368 X X L-3 COMMUNICATIONS HLDGS INC Common Stock 502424104 3,270,400 29,200 X X LIBERTY MEDIA CORP-A Common Stock 530718105 758,400 60,000 X X ELI LILLY & CO. Common Stock 532457108 2,667,000 35,000 X X LITTELFUSE, INC. Common Stock 537008104 990,800 40,000 X X MGIC INVESTMENT CORP Common Stock 552848103 1,710,750 25,000 X X MAY DEPT STORES Common Stock 577778103 2,195,550 63,000 X X MCDONALDS CORP Common Stock 580135101 1,110,000 40,000 X X MEDIMMUNE INC Common Stock 584699102 1,573,200 40,000 X X MERCK & CO. Common Stock 589331107 2,879,000 50,000 X X MICROSOFT CORP. Common Stock 594918104 5,638,985 93,500 X X MOBILE MINI INC Common Stock 60740F105 1,837,478 57,100 X X MORGAN STANLEY DEAN WITTER & C Common Stock 617446448 2,177,814 38,001 X X NANOPHASE TECHNOLOGIES Common Stock 630079101 480,318 57,800 X X NASDAQ 100 SHARES Common Stock 631100104 2,188,590 60,693 X X NEWPARK RESOURCES INC. Common Stock 651718504 966,301 124,684 X X NEWS CORP LTD-SPONS ADR Common Stock 652487703 823,020 29,000 X X NOKIA ADR A Common Stock 654902204 1,845,860 89,000 X X NORFOLK SOUTHERN CORP Common Stock 655844108 2,506,518 104,700 X X NORTHROP GRUMMAN CORP Common Stock 666807102 487,901 4,316 X X NORTHSTAR CAPITAL INVMNT GRP Common Stock 66704F106 4,947,500 250,000 X X NORTHSTAR CAPITAL INVMNT GRP Common Stock 66704F999 1,061,120 53,619 X X NUCOR CORP Common Stock 670346105 1,413,280 22,000 X X OMEGA WORLDWIDE INC Common Stock 68210B108 41,996 19,998 X X PEPSICO INC Common Stock 713448108 1,287,500 25,000 X X PETROLEUM GEO-SVCS -SPON ADR Common Stock 716597109 618,450 95,000 X X PFIZER, INC. Common Stock 717081103 6,537,230 164,500 X X PITNEY BOWES INC Common Stock 724479100 1,112,800 26,000 X X BANCO POPULAR Common Stock 733174106 77,160 2,641 X X POWERWAVE TECHNOLOGIES INC Common Stock 739363109 1,171,170 91,000 X X PRICE LEGACY CORPORATION Common Stock 74144P106 142,938 44,668 X X PRUDENTIAL FINANCIAL INC. Common Stock 744320102 78,091 2,515 X X PUBLIC STORAGE INC. Common Stock 74460D109 26 1 X X QUANTA SERVICES INC Common Stock 74762E102 1,158,430 67,000 X X RADIANT SYSTEMS INC Common Stock 75025N102 343,900 38,000 X X RADIOSHACK CORP Common Stock 750438103 1,051,400 35,000 X X RIO ALTO EXPLORATION LTD Common Stock 766892103 775,941 80,000 X X ROYAL DUTCH PETROLEUM CO. Common Stock 780257804 325,920 6,000 X X SPX CORPORATION Common Stock 784635104 2,548,440 18,000 X X SSGA CORP BOND INDEX FUND Common Stock 78899H920 13,094,466 957,968 X X SAKS INCORPORATED Common Stock 79377W108 631,200 48,000 X X SANDISK CORP Common Stock 80004C101 499,100 23,000 X X SCHERING PLOUGH CORP Common Stock 806605101 3,969,090 126,808 X X SCHOLASTIC CORP Common Stock 807066105 2,709,500 50,000 X X SHELL TRANSPORT - TRADING ADR Common Stock 822703609 885,600 20,000 X X SHIRE PHARMACEUTICALS Common Stock 82481R106 516,362 22,000 X X SIX FLAGS INC. Common Stock 83001P109 1,250,200 70,000 X X SPRINT CORPORATION Common Stock 852061506 391,020 38,000 X X STATE STREET CORP Common Stock 857477103 1,661,400 30,000 X X SUN MICROSYSTEMS, INC. Common Stock 866810104 1,137,780 129,000 X X SUNGARD DATA SYSTEMS Common Stock 867363103 2,637,600 80,000 X X SYMANTEC CORP Common Stock 871503108 1,648,400 40,000 X X TARGET CORP Common Stock 87612E106 2,156,000 50,000 X X TECHNITROL INC Common Stock 878555101 953,600 40,000 X X TELLABS INC. Common Stock 879664100 1,094,115 104,500 X X TENET HEALTHCARE CORP Common Stock 88033G100 3,015,900 45,000 X X TEXAS INSTRUMENTS Common Stock 882508104 1,026,100 31,000 X X TEXTRON, INC Common Stock 883203101 2,197,300 43,000 X X TRIBUNE CO Common Stock 896047107 4,273,240 94,000 X X TROPICAL SPORTSWEAR INTL Common Stock 89708P102 396,000 16,500 X X U.S. AIRWAYS GROUP, INC. Common Stock 911905107 126,381 19,594 X X VF CORP. Common Stock 918204108 1,513,750 35,000 X X VERIZON CORPORATION Common Stock 92343V104 1,613,500 35,000 X X VIACOM INC Common Stock 925524100 1,458,000 30,000 X X VIACOM INC Common Stock 925524308 572,701 11,840 X X WACHOVIA CORP. 2ND NEW COM Common Stock 929903102 2,781,000 75,000 X X WAL-MART STORES, INC. Common Stock 931142103 1,103,400 18,000 X X WALGREENS CO Common Stock 931422109 4,604,825 117,500 X X WATSCO Common Stock 942622101 216,000 12,000 X X WATSCO Common Stock 942622200 1,088,850 61,000 X X WINTRUST FINANCIAL CORP Common Stock 97650W108 1,609,049 70,050 X X WIRELESS TELECOM GROUP, INC. Common Stock 976524108 355,104 109,600 X X WORLDCOM INC Common Stock 98157D106 900,464 133,600 X X WORLDCOM INC Common Stock 98157D304 9,834 1,664 X X WRIGLEY, (WM) JR. CO. Common Stock 982526105 1,226,130 23,000 X X WYETH Common Stock 983024100 787,800 12,000 X X YAHOO ! INC. Common Stock 984332106 1,394,901 75,523 X X YOUNG BROADCASTING CORP -A Common Stock 987434107 1,636,845 65,500 X X ZIMMER HOLDINGS INC Common Stock 98956P102 1,021,500 30,000 X X MAX RE CAPITAL LTD. Common Stock G6052F103 10 1 X X TRENWICK GROUP Common Stock G9032C109 5,204,385 580,199 X X AUDIOCODES LTD Common Stock M15342104 170,000 50,000 X X SUN INTERNATIONAL HOTELS LTD-A Common Stock P8797T133 326,520 12,000 X X CKE RESTAURANTS INC Taxable Bonds-Convertible 12561EAB1 974,550 1,095,000 X X CLEAR CHANNEL COMM Taxable Bonds-Convertible 184502AE2 410,656 425,000 X X ESC MEDICAL SYSTEMS Taxable Bonds-Convertible 269025AA0 511,619 545,000 X X ESC MEDICAL SYSTEMS Taxable Bonds-Convertible 269025AB8 300,400 320,000 X X GETTY IMAGES, INC Taxable Bonds-Convertible 374276AD5 2,655,000 3,000,000 X X GOLD EAGLE CAPITAL 2001 Taxable Bonds-Convertible 38058MAA0 4,001,320 4,000,000 X X HILTON HOTELS CORP. Taxable Bonds-Convertible 432848AL3 639,563 675,000 X X INTERIM SERVICES, INC. Taxable Bonds-Convertible 45868PAA8 929,425 1,130,000 X X MASCOTECH INC. Taxable Bonds-Convertible 574670AB1 358,000 400,000 X X MUTUAL RISK Taxable Bonds-Convertible 628351AA6 195,000 1,000,000 X X QUANTA SERVICES INC Taxable Bonds-Convertible 74762EAA0 1,407,500 2,000,000 X X THERMO INSTRUMENT SYSTEMS Taxable Bonds-Convertible 883559AE6 648,956 695,000 X X THERMO FIBERTEK INC Taxable Bonds-Convertible 88355WAA3 472,500 500,000 X X THERMO FIBERTEK INC Taxable Bonds-Convertible VV3081948 500,000 500,000 X X BOLDER TECHNOLOGIES CORP. Preferred Stock-Convertible 097519201 800 40,000 X X FLEET BOSTON FINANCIAL CORP Preferred Stock-Convertible 339030702 253,193 4,950 X X 432,709,503 40,911,032