| Abbott Laboratories |
15,858 |
| State Farm Insurance Companies |
8,085 |
| Southern Illinois University |
7,788 |
| University of Illinois at Chicago |
7,352 |
| UBS Financial Services Inc. |
7,168 |
| Motorola, Inc. |
5,818 |
| The Allstate Corporation |
5,307 |
| The Boeing Company |
5,298 |
| DePaul University |
4,811 |
| University Illinois Urbana Campus |
4,161 |
| CDW Corporation |
4,127 |
| Kraft Foods Inc. |
4,084 |
| The University of Chicago |
3,654 |
| Loyola University Medical Center |
3,049 |
| National Association of Realtors |
2,801 |
| Baxter International Inc. |
2,573 |
| Baker & McKenzie LLP |
2,491 |
| DLA Piper |
2,479 |
| Coldwell Banker Residential Brokerage |
2,476 |
| Takeda Pharmaceuticals North America, Inc. |
2,471 |
| Illinois Institute of Technology |
2,362 |
| Northwestern University |
2,356 |
| Tribune Company |
2,209 |
| Walgreen Co. |
2,180 |
| Kirkland & Ellis LLP |
2,108 |
| National-Louis University |
2,022 |
| Caterpillar Inc. |
1,966 |
| Koenig & Strey GMAC Realtors |
1,946 |
| City Colleges of Chicago |
1,909 |
| Community Unit School District 300 |
1,854 |
| Roosevelt University |
1,831 |
| Jones Lang LaSalle Incorporated |
1,817 |
| Southern Illinois University School of Medicine |
1,754 |
| R.R. Donnelley & Sons Company |
1,738 |
| Mayer Brown |
1,701 |
| Northern Trust Corporation |
1,689 |
| Sidley Austin LLP |
1,655 |
| McDermott, Will & Emery |
1,617 |
| Hyatt Corporation |
1,569 |
| American Academy of Dermatology |
1,489 |
| Grant Thornton LLP |
1,468 |
| Baird |
1,463 |
| Joliet Junior College |
1,451 |
| Sonnenschein Nath & Rosenthal, LLP |
1,443 |
| Loyola University of Chicago |
1,420 |
| Aon Corporation |
1,408 |
| Exelon Corporation |
1,406 |
| W.W. Grainger, Inc. |
1,369 |
| Sara Lee Corporation |
1,366 |
| Deere & Company |
1,331 |
| Sears Holdings Corporation |
1,320 |
| Hewitt Associates, Inc. |
1,306 |
| Columbia College Chicago |
1,299 |
| Winston |
1,270 |
| Northeastern Illinois University |
1,267 |
| MillerCoors LLC |
1,228 |
| Robert Morris University |
1,215 |
| Archer-Daniels-Midland Company |
1,215 |
| Zurich Financial |
1,181 |
| YMCA of the USA (National Headquarters) |
1,177 |
| CareerBuilder Inc. |
1,133 |
| Katten Muchin Rosenman LLP |
1,120 |
| Blue Cross and Blue Shield of Illinois |
1,090 |
| College of DuPage |
1,075 |
| CNA Financial Corporation |
1,060 |
| Locke Lord Bissell |
1,051 |
| Board of Education of The City of Chicago |
1,016 |
| Hospira, Inc. |
986 |
| State of Illinois |
982 |
| Keller Graduate School of Management |
947 |
| UAL Corporation |
935 |
| Forsythe Technology, Inc. |
931 |
| OfficeMax, Inc. |
919 |
| Wolters Kluwer |
918 |
| Northfield Twp High School District 225 |
897 |
| Seyfarth Shaw LLP |
884 |
| Schneider Electric |
867 |
| The School of the Art Institute of Chicago |
861 |
| Tellabs, Inc. |
847 |
| Oswego 308 Community Unit School District |
839 |
| Maine Township High School District 207 |
837 |
| Elmhurst College |
828 |
| Advocate Health Care |
827 |
| University of Illinois at Urbana Champaign |
824 |
| State of Illinois |
810 |
| Hinshaw |
804 |
| Discover Financial Services |
803 |
| McDonald's Corporation |
761 |
| U.S. Foodservice, Inc. |
754 |
| BDO Seidman, LLP |
750 |
| Starcom MediaVest Group |
734 |
| Anixter International Inc. |
733 |
| A. T. Kearney Inc. |
730 |
| Elgin Community College |
720 |
| City of Chicago |
715 |
| Saint Xavier University |
713 |
| Waubonsee Community College |
698 |
| glenbard HS |
698 |
| Molex Incorporated |
685 |
| Thornton Township High School District 205 |
683 |
| Township High School District 211 |
681 |
| Northern Illinois University |
673 |
| Plainfield Community Consolidated School District 202 |
671 |
| Quarles |
665 |
| True Value Company |
659 |
| TransUnion, LLC |
656 |
| Niles Township Community High School District 219 |
656 |
| Ace Hardware Corporation |
647 |
| Arthur J. Gallagher & Co. |
642 |
| COUNTRY Financial |
636 |
| Pactiv Corporation |
631 |
| Harris Bankcorp, Inc. |
630 |
| College of Lake County |
624 |
| General Growth Properties, Inc. |
622 |
| Hudson Highland Group |
613 |
| Crete-Monee School District |
608 |
| Navistar International Corporation |
607 |
| Community Unit School District 95 |
605 |
| Danville School District 118 |
603 |
| USG Corporation |
603 |
| Akzo Nobel NV |
602 |
| United States Cellular Corporation |
601 |
| Stevenson High School |
597 |
| Black Hawk College |
592 |
| Edelman |
590 |
| Argonne National Laboratory (ANL) |
574 |
| Heartland Community College |
570 |
| North Park University |
568 |
| Eastern Illinois University |
564 |
| DraftFCB |
554 |
| Lincoln Land Community College |
542 |
| Jenner |
538 |
| Evangelical Lutheran Church in America |
531 |
| Kmart |
529 |
| The University of Chicago Graduate School of Business |
504 |
| Wm. Wrigley Jr. Company |
497 |
| School District U-46 |
489 |
| Navigant Consulting, Inc. |
487 |
| Knox College |
485 |
| William Blair & Company, L.L.C. |
484 |
| Rush University Medical Center |
483 |
| Heidrick & Struggles International, Inc. |
481 |
| Illinois State University |
477 |
| Mesirow Financial Holdings Inc. |
473 |
| NorthShore University HealthSystem |
470 |
| Danville Area Community College |
469 |
| American Intercontinental University |
467 |
| Dominican University |
467 |
| Spencer Stuart Management Consultants N.V. |
466 |
| Schiff Hardin |
462 |
| Collinsville Unit School District 10 |
460 |
| Alzheimer's Disease and Related Disorders Association, Inc. |
457 |
| Underwriters Laboratories Inc. |
450 |
| USF Corporation |
450 |
| Allscripts-Misys Healthcare Solutions, Inc. |
443 |
| Fermi National Accelerator Laboratory (FNAL) |
434 |
| Sycamore Community Unit School District 427 |
434 |
| Astellas Pharma US, Inc |
433 |
| New Trier High School |
431 |
| Intercall, Inc. |
430 |
| Chicago Public School System |
430 |
| American Medical Association |
419 |
| Blue Cross Blue Shield Association |
417 |
| Naperville Community Unit School District 203 |
414 |
| Panduit Corp. |
413 |
| Aurora University |
412 |
| Follett Corporation |
409 |
| LOGS Network: Shapiro & Partners LLP |
409 |
| Oak Park |
406 |
| Axiom Associates, Inc. |
405 |
| Hub International |
405 |
| LW District 210 |
405 |
| IDEX Corporation |
404 |
| Smurfit-Stone Container |
403 |
| Lake Forest College |
401 |
| University of Chicago Hospitals |
399 |
| OSF Healthcare System |
395 |
| Robert Half Technology |
393 |
| Vedder Price P.C. |
392 |
| GATX Corporation |
390 |
| Securitas Security Services USA |
381 |
| AAR Corp. |
374 |
| Rexam Beverage Can Americas Inc. |
373 |
| Carle Foundation Hospital |
372 |
| The Quaker Oats Company |
370 |
| Children's Memorial Hospital |
369 |
| Clifton Gunderson LLP |
368 |
| SPSS Inc. |
362 |
| Packaging Corporation of America |
361 |
| Nuveen Investments, Inc. |
360 |
| Lovells |
360 |
| @ properties |
360 |
| United Stationers Inc. |
357 |
| NAVTEQ Corporation |
356 |
| Kaneland CUSD 302 |
349 |
| Nalco Company |
344 |
| Huron Consulting Group Inc. |
343 |
| Morningstar, Inc. |
340 |
| Sun-Times Media Group, Inc. |
336 |
| Northwestern Memorial Healthcare |
333 |
