| The University of Chicago |
23,944 |
| Abbott Laboratories |
15,822 |
| Southern Illinois University |
8,681 |
| State Farm Insurance Companies |
8,121 |
| UBS Financial Services Inc. |
7,187 |
| University of Illinois at Chicago |
5,928 |
| Motorola, Inc. |
5,302 |
| The Boeing Company |
4,999 |
| The Allstate Corporation |
4,950 |
| CDW Corporation |
4,166 |
| Kraft Foods Inc. |
4,116 |
| University of Chicago Hospitals |
4,108 |
| University Illinois Urbana Campus |
3,938 |
| Illinois State University |
3,660 |
| DePaul University |
3,539 |
| Loyola University Health System |
2,943 |
| University of Illinois at Urbana Champaign |
2,897 |
| National Association of Realtors |
2,821 |
| Baxter International Inc. |
2,614 |
| Baker & McKenzie LLP |
2,489 |
| Takeda Pharmaceuticals North America, Inc. |
2,477 |
| Illinois Institute of Technology |
2,322 |
| Tribune Company |
2,283 |
| K&L Gates |
2,273 |
| Walgreen Co. |
2,238 |
| Northwestern University |
2,228 |
| DLA Piper |
2,083 |
| Koenig & Strey GMAC Realtors |
1,946 |
| City Colleges of Chicago |
1,911 |
| Community Unit School District 300 |
1,856 |
| Roosevelt University |
1,835 |
| Jones Lang LaSalle Incorporated |
1,827 |
| Caterpillar Inc. |
1,815 |
| Southern Illinois University School of Medicine |
1,813 |
| Kirkland & Ellis LLP |
1,739 |
| R.R. Donnelley & Sons Company |
1,734 |
| Northern Trust Corporation |
1,713 |
| Coldwell Banker Residential Brokerage |
1,681 |
| National-Louis University |
1,650 |
| McDermott, Will & Emery |
1,618 |
| Hyatt Corporation |
1,570 |
| Sidley Austin LLP |
1,494 |
| American Academy of Dermatology |
1,474 |
| Joliet Junior College |
1,450 |
| Sonnenschein Nath & Rosenthal, LLP |
1,432 |
| Loyola University of Chicago |
1,420 |
| Mayer Brown LLP |
1,405 |
| Sara Lee Corporation |
1,394 |
| Exelon Corporation |
1,392 |
| W.W. Grainger, Inc. |
1,390 |
| Grant Thornton LLP |
1,381 |
| Baird |
1,367 |
| Deere & Company |
1,357 |
| Sears Holdings Corporation |
1,342 |
| Hewitt Associates, Inc. |
1,316 |
| Northeastern Illinois University |
1,296 |
| Columbia College Chicago |
1,287 |
| Archer-Daniels-Midland Company |
1,269 |
| Aon Corporation |
1,253 |
| MillerCoors LLC |
1,221 |
| Robert Morris University |
1,209 |
| YMCA of the USA (National Headquarters) |
1,177 |
| Zurich Financial |
1,173 |
| CareerBuilder Inc. |
1,087 |
| College of DuPage |
1,083 |
| CNA Financial Corporation |
1,067 |
| Locke Lord Bissell |
1,067 |
| Katten Muchin Rosenman LLP |
1,037 |
| Board of Education of The City of Chicago |
1,024 |
| Winston & Strawn LLP |
1,022 |
| Hospira, Inc. |
986 |
| State of Illinois |
974 |
| Wolters Kluwer |
943 |
| Forsythe Technology, Inc. |
941 |
| OfficeMax, Inc. |
920 |
| The University of Chicago Graduate School of Business |
917 |
| Keller Graduate School of Management |
896 |
| Northfield Twp High School District 225 |
894 |
| Schneider Electric |
875 |
| Seyfarth Shaw LLP |
861 |
| Tellabs, Inc. |
858 |
| The School of the Art Institute of Chicago |
855 |
| McDonald's Corporation |
846 |
| Discover Financial Services |
844 |
| Elmhurst College |
828 |
| Advocate Health Care |
816 |
| Oswego 308 Community Unit School District |
811 |
| Blue Cross and Blue Shield of Illinois |
806 |
| Hinshaw & Culbertson, LLP |
804 |
| Maine Township High School District 207 |
802 |
| State of Illinois |
787 |
| U.S. Foodservice, Inc. |
763 |
| Starcom MediaVest Group |
733 |
| A. T. Kearney Inc. |
730 |
| Anixter International Inc. |
722 |
| City of Chicago |
718 |
| Saint Xavier University |
714 |
| Molex Incorporated |
700 |
| glenbard HS |
698 |
| TransUnion, LLC |
671 |
| True Value Company |
668 |
| Navistar International Corporation |
667 |
| Quarles |
665 |
| Northern Illinois University |
662 |
| Plainfield Community Consolidated School District 202 |
657 |
| Niles Township Community High School District 219 |
656 |
| Township High School District 211 |
648 |
| Arthur J. Gallagher & Co. |
648 |
| Ace Hardware Corporation |
646 |
| COUNTRY Financial |
639 |
| Elgin Community College |
635 |
| Harris Bankcorp, Inc. |
634 |
| Pactiv Corporation |
631 |
| BDO Seidman, LLP |
608 |
| Thornton Township High School District 205 |
608 |
| Crete-Monee School District |
608 |
| General Growth Properties, Inc. |
604 |
| Hudson Highland Group |
604 |
| Danville School District 118 |
603 |
| USG Corporation |
603 |
| U.S. Cellular Corporation |
602 |
| Argonne National Laboratory (ANL) |
600 |
| Stevenson High School |
597 |
| Edelman |
596 |
| Akzo Nobel NV |
593 |
| Eastern Illinois University |
573 |
| North Park University |
568 |
| DraftFCB |
561 |
| Waubonsee Community College |
558 |
| College of Lake County |
547 |
| Black Hawk College |
539 |
| Evangelical Lutheran Church in America |
532 |
| Kmart |
528 |
| Lincoln Land Community College |
525 |
| Heartland Community College |
521 |
| Community Unit School District 95 |
507 |
| Jenner & Block LLP |
503 |
| Mesirow Financial Holdings Inc. |
499 |
| Navigant Consulting, Inc. |
494 |
| William Blair & Company, L.L.C. |
491 |
| Rush University Medical Center |
489 |
| Wm. Wrigley Jr. Company |
488 |
| Knox College |
484 |
| NorthShore University HealthSystem |
476 |
| Danville Area Community College |
469 |
| Dominican University |
469 |
| American Intercontinental University |
467 |
| USF Corporation |
456 |
| Allscripts-Misys Healthcare Solutions, Inc. |
455 |
| Alzheimer's Disease and Related Disorders Association, Inc. |
454 |
| Underwriters Laboratories Inc. |
453 |
| Spencer Stuart Management Consultants N.V. |
448 |
| Heidrick & Struggles International, Inc. |
441 |
| Blue Cross Blue Shield Association |
441 |
| School District U-46 |
438 |
| Follett Corporation |
435 |
| Astellas Pharma US, Inc |
434 |
| Sycamore Community Unit School District 427 |
434 |
| New Trier High School |
430 |
| American Medical Association |
428 |
| LOGS Network: Shapiro & Partners LLP |
428 |
| Fermi National Accelerator Laboratory (FNAL) |
425 |
| Chicago Public School System |
412 |
| Collinsville Unit School District 10 |
410 |
| Smurfit-Stone Container |
409 |
| UAL Corporation |
408 |
| Securitas Security Services USA |
407 |
| Hub International |
407 |
| Panduit Corp. |
407 |
| Oak Park |
406 |
| LW District 210 |
405 |
| Naperville Community Unit School District 203 |
403 |
| Axiom Associates, Inc. |
402 |
| IDEX Corporation |
398 |
| Robert Half Technology |
394 |
| Vedder Price P.C. |
392 |
| OSF Healthcare System |
391 |
| GATX Corporation |
384 |
| Children's Memorial Hospital |
377 |
| Schiff Hardin |
376 |
| AAR Corp. |
376 |
| Aurora University |
375 |
| Carle Foundation Hospital |
372 |
| The Quaker Oats Company |
370 |
| Rexam Beverage Can Americas Inc. |
369 |
| SPSS Inc. |
367 |
| United Stationers Inc. |
364 |
| Intercall, Inc. |
362 |
| @ properties |
360 |
| NAVTEQ Corporation |
359 |
| Clifton Gunderson LLP |
358 |
| Lake Forest College |
356 |
| Morningstar, Inc. |
351 |
| Nuveen Investments, Inc. |
349 |
| Nalco Company |
349 |
| Kaneland CUSD 302 |
349 |
| Lovells |
348 |
| Huron Consulting Group Inc. |
338 |
| Packaging Corporation of America |
334 |
| Sun-Times Media Group, Inc. |
325 |
