| The University of Western Ontario |
10,406 |
| McMaster University |
5,102 |
| Alcoa Inc. |
3,698 |
| The University of Chicago |
3,580 |
| Greater Tulsa Association of Realtors |
3,290 |
| General Dynamics Corporation |
2,724 |
| Industry Canada |
2,416 |
| Illinois Institute of Technology |
2,349 |
| Harrisburg Area Community College |
2,117 |
| Cox Communications, Inc. |
2,008 |
| Garvan Research Foundation |
1,993 |
| American Cancer Society, Inc. |
1,783 |
| College of Charleston |
1,577 |
| American Academy of Dermatology |
1,483 |
| American Red Cross |
1,423 |
| University of Calgary |
1,389 |
| Brigham Young University - Idaho |
1,261 |
| Monash Bioethics Review |
1,261 |
| The Institute of Electrical and Electronics Engineers, Inc. |
1,258 |
| Williams College |
1,215 |
| The MITRE Corporation |
1,188 |
| YMCA of the USA (National Headquarters) |
1,179 |
| Dartmouth College |
1,121 |
| Fred Hutchinson Cancer Research Center |
1,058 |
| AAA Washington |
998 |
| Monash University |
988 |
| Wellesley College |
903 |
| United Nations |
892 |
| Miracosta College |
790 |
| University of Alabama |
771 |
| Battelle Memorial Institute |
757 |
| Lakehead University |
740 |
| Association for the Advancement of Retired Persons |
685 |
| Catholic Health Initiatives |
682 |
| Carleton College |
680 |
| American Heart Association |
633 |
| Aurora HealthCare |
604 |
| Association for Computing Machinery Inc. |
586 |
| SRI International |
577 |
| BayCare Health System |
564 |
| Confederation College |
564 |
| The Nature Conservancy |
555 |
| CareFirst, Inc. |
551 |
| Southwest Research Institute |
543 |
| Century College |
542 |
| Desert Research Institute |
539 |
| Texas Lutheran University |
535 |
| Evangelical Lutheran Church in America |
529 |
| Education Svc Ctr Region 20 |
514 |
| Cedars Sinai Medical Center |
494 |
| The Church Of Jesus Christ of Latter-Day Saints |
485 |
| Rush University Medical Center |
483 |
| Memorial University of Newfoundland |
461 |
| Alzheimer's Disease and Related Disorders Association, Inc. |
457 |
| San Jose Silicon Valley Chamber of Commerce |
456 |
| Research Triangle Institute |
443 |
| Monash University ABN 12 |
437 |
| RAND Corporation |
436 |
| The Salvation Army International |
426 |
| Boy Scouts of America National Council |
424 |
| Florida Department of Education |
419 |
| St. Jude Children's Research Hospital |
417 |
| Regional Center of the East Bay |
413 |
| Texas Christian University |
391 |
| National Education Association of The United States |
385 |
| Saint Leo University |
379 |
| Concurrent Technologies Corporation |
379 |
| International Monetary Fund |
376 |
| World Learning Inc |
362 |
| VHA Inc. |
355 |
| Dana-Farber Cancer Institute |
352 |
| Banco Standard Chartered |
349 |
| Centre for Cellular and Molecular Biology (CCMB) |
349 |
| Federal Emergency Management Agency |
341 |
| Premera Blue Cross |
340 |
| American Chemical Society |
333 |
| SAE International |
332 |
| Catholic Healthcare Partners |
328 |
| Sisters of St. Francis Health Services, Inc. |
315 |
| TechAmerica |
314 |
| Kaleida Health |
309 |
| Fraternal Order Of Eagles |
306 |
| Faith Lutheran Church |
298 |
| American Society for Dermatologic Surgery |
295 |
| Harvard University Law School |
293 |
| Sacramento District Dental Society |
291 |
| Public Broadcasting Service |
290 |
| Merrimack College |
288 |
| United Way of America |
288 |
| Weber State University |
287 |
| Monash University Law Review |
285 |
| American Bar Association |
284 |
| Mercy College |
283 |
| Recreational Equipment, Inc. |
281 |
| LifeWay Christian Resources of the Southern Baptist Convention |
280 |
| American Library Association |
280 |
| Atlantic Baptist Churches |
276 |
| American Bureau of Shipping (ABS) |
275 |
| Santa Monica - Malibu Education Foundation |
274 |
| American Bankers Association |
268 |
| Girl Scouts of the United States of America |
267 |
| Veterans of Foreign Wars of the United States |
266 |
| National Multiple Sclerosis Society |
261 |
| North American Mission Board, SBC |
258 |
| St John's Evangelical Lutheran |
258 |
| The Palo Alto Medical Foundation for Health Care, Research and Education |
257 |
| Aultman Health Foundation |
255 |
| American Institute of Certified Public Accountants |
254 |
| The Nemours Foundation |
253 |
| Saudi Arabia Cultural Mission |
251 |
| American Hospital Association |
248 |
| American Federation of Teachers |
246 |
| University of Guelph-Humber |
245 |
| Monterey Bay Aquarium Research Institute |
242 |
| American Diabetes Association |
241 |
| March of Dimes |
241 |
| United States Tennis Association |
240 |
| Energy |
239 |
| South Fayette School District |
238 |
| The Jackson Laboratory |
236 |
| Sierra Club |
236 |
| Electric Power Research Institute, Inc. |
234 |
| Northwestern Medical Faculty Foundation, Inc. |
231 |
| Ohlone College |
230 |
| Salvation Army, NYC Midtown |
229 |
| Hill Air Force Base |
229 |
| Unitarian Universalist Association |
228 |
| ASAE (American Society of Association Executives) |
227 |
| International Fund For Animal Welfare Inc. |
225 |
| Broadcast Music, Inc. |
224 |
| Arthritis Foundation |
224 |
| Seedco |
221 |
| United States Fund for UNICEF |
214 |
| Samuel Merritt College |
214 |
| The United Methodist Church of the Resurrection |
212 |
| SeaWorld San Antonio |
205 |
| Christ Church Episcopal |
200 |
| Monitor Group LLC |
198 |
| American Society of Mechanical Engineers |
196 |
| Noblis, Inc |
195 |
| American Academy of Family Physicians |
195 |
| Massachusetts Medical Society |
194 |
| Texas Medical Association |
191 |
| Smoky Mountain Center |
190 |
| National Wildlife Federation |
189 |
| Phi Theta Kappa - Nu Tau Chapter |
189 |
| Pennsylvania Higher Education Assistance Agency |
188 |
| The First Church of Christ, Scientist |
188 |
| American Legion National Hq Mis |
187 |
| WGBH Educational Foundation |
187 |
| University Of Colorado Foundation - CUFUND |
186 |
| NPL |
186 |
| The Leukemia |
185 |
| Ducks Unlimited, Inc. |
184 |
| MDA - Muscular Dystrophy Association |
181 |
| Touro College |
181 |
| PGA TOUR, Inc. |
181 |
| American Dental Association |
181 |
| American Association for the Advancement of Science AAAS |
179 |
| World Resources Institute (WRI) |
178 |
| New York State Society of Certified Public Accountants |
177 |
| Anchor Trust |
176 |
| National Association of Insurance Commissioners |
176 |
| Devereux Foundation |
173 |
| Chemical Abstracts Services |
171 |
| Paralyzed Veterans of America |
169 |
| United Church of Christ |
168 |
| Society for Human Resource Management |
168 |
| American College of Radiology |
167 |
| Association of American Medical Colleges |
167 |
| WVIZ/PBS |
167 |
| Charles Stark Draper Laboratory, Inc. |
166 |
| Gundersen Lutheran |
165 |
| American Chemistry Council |
164 |
| American Psychological Association |
164 |
| District of Columbia Public Schools |
163 |
| City Year |
162 |
| National Endowment for the Arts |
162 |
| American College of Emergency Physicians |
161 |
| Cox Health Systems |
161 |
| Federal Reserve Bank of Chicago |
161 |
| National Audubon Society, Inc. |
159 |
| The American Institute of Architects |
159 |
| Brookside Golf |
158 |
| The Joint Commission |
156 |
| National Association of Manufacturers |
155 |
| Knights of Columbus |
155 |
| Colonial Williamsburg Foundation |
154 |
| Maniotba Blue Cross |
154 |
| American Society of Health-System Pharmacists |
154 |
| Halifax Health |
153 |
| American Public Works |
152 |
| Habitat for Humanity |
150 |
| Service Employees International Union |
149 |
| Mercy High School |
147 |
| American Federation of State, County and Municipal Employees, AFL-CIO |
145 |
| National Association for the Education of Young ChILDREN |
145 |
| CARE Headquarters |
145 |
| Saint Peter's University Hospital |
144 |
| Institute for Global Communications |
144 |
