| THE ASPEN INSTITUTE INC | Washington | DC | $443.8M | 12 |
| AMERICAN INSTITUTES FOR RESEARCH IN THE | Arlington | VA | $437.2M | 31 |
| NATIONAL OPINION RESEARCH CENTER | Chicago | IL | $397.2M | 23 |
| American Psychological Association | Washington | DC | $138.3M | 37 |
| The Urban Institute | Washington | DC | $124.7M | 9 |
| ITHAKA HARBORS INC | New York | NY | $106M | 27 |
| THE BROOKINGS INSTITUTION | Washington | DC | $89.4M | 26 |
| Human Resources Research Organization | Alexandria | VA | $70.4M | 21 |
| BUCK INSTITUTE FOR RESEARCH ON AGING | Novato | CA | $69.5M | 8 |
| AMERICAN ENTERPRISE INSTITUTE FOR PUBLIC | Washington | DC | $68M | 15 |
| NATIONAL BUREAU OF ECONOMIC | Cambridge | MA | $61M | 11 |
| GLOBAL POVERTY PROJECT INC | New York | NY | $60.6M | 12 |
| INNOVATIONS FOR POVERTY ACTION | Washington | DC | $53.3M | 9 |
| Pew Research Center | Washington | DC | $46.7M | 12 |
| THE CENTER FOR EMPLOYMENT SECURITY | Washington | DC | $45.8M | 10 |
| RSF SOCIAL FINANCE INC | San Francisco | CA | $41M | 12 |
| Mercatus Center Inc | Arlington | VA | $39.3M | 12 |
| ALZHEIMER'S DRUG DISCOVERY FOUNDATION | New York | NY | $37.7M | 8 |
| CIVIL-MILITARY INNOVATION | Morgantown | WV | $33.3M | 9 |
| AFRICAN POPULATION & HEALTH | Rockville | MD | $31.6M | 17 |
| Atlas Economic Research Foundation | Arlington | VA | $28.8M | 11 |
| BEHAVIORAL IDEAS LAB INC | New York | NY | $24M | 23 |
| SOCIAL SCIENCE RESEARCH COUNCIL | Brooklyn | NY | $23.5M | 8 |
| AMERICAN FEDERATION FOR AGING RESEARCH | New York | NY | $22.8M | 9 |
| ESALEN INSTITUTE | Big Sur | CA | $22.7M | 7 |
| WOODROW WILSON INTERNATIONAL CENTER | Washington | DC | $22.1M | 10 |
| CPWR THE CENTER FOR CONSTRUCTION | Silver Spring | MD | $18.9M | 7 |
| The Becket Fund | Washington | DC | $18.8M | 9 |
| HUMAN SERVICES RESEARCH INSTITUTE INC | Cambridge | MA | $17.9M | 9 |
| AMERICAN ACADEMY OF ARTS & SCIENCES | Cambridge | MA | $17.3M | 7 |
| POPULATION CONNECTION | Washington | DC | $17M | 6 |
| Memorial Hermann Community Benefit | Houston | TX | $16.7M | 9 |
| INSTITUTE FOR OPERATIONS RESEARCH AND | Catonsville | MD | $16.2M | 6 |
| SOCIAL RESEARCH APPLICATIONS | Los Altos Hills | CA | $16.1M | 0 |
| Laureate Institute for Brain Research Inc | Tulsa | OK | $16.1M | 8 |
| OUT & EQUAL | Oakland | CA | $15.2M | 10 |
| SALZBURG GLOBAL SEMINAR INC | Washington | DC | $15M | 7 |
| NEXTCORPS INC | Rochester | NY | $14.7M | 2 |
| AMERICAN ECONOMIC ASSOCIATION | Nashville | TN | $14.3M | 14 |
| CENTER FOR APPLIED RESEARCH | Santa Rosa | CA | $14.2M | 7 |
| THE MORNING STAR FOUNDATION | Woodland | CA | $13.5M | 0 |
| THE ULI FOUNDATION | Washington | DC | $12.5M | 2 |
| WASHINGTON CENTER FOR EQUITABLE GROWTH | Washington | DC | $12M | 9 |
| ECONOMIC POLICY INSTITUTE | Washington | DC | $11.9M | 7 |
| JUST CAPITAL FOUNDATION INC | New York | NY | $11.8M | 11 |
| Population Reference Bureau Inc | Washington | DC | $11.7M | 9 |
| INSTITUTE FOR FAMILY DEVELOPMENT | Federal Way | WA | $11.4M | 5 |
| THE NARBHA INSTITUTE INC | Flagstaff | AZ | $11.2M | 11 |
| PETER G PETERSON INSTITUTE FOR | Washington | DC | $10.9M | 9 |
| GRUPO NEXOS INC | San Juan | PR | $10.3M | 0 |
