| American Society for Testing and MaterialsConshohocken | Form 990 | $134,694,228FY2024 |
| National Center for Defense Manufacturing and MachiningJohnstown | Form 990 | $119,433,940FY2025 |
| Concurrent Technologies CorporationJohnstown | Form 990 | $101,274,766FY2025 |
| Sae InternationalWarrendale | Form 990 | $95,057,958FY2024 |
| Advanced Robotics for Manufacturing InstitutePittsburgh | Form 990 | $31,939,842FY2025 |
| Academy of Natural Sciences of PhiladelphiaPhiladelphia | Form 990 | $25,774,400FY2025 |
| University City Science CenterPhiladelphia | Form 990 | $23,164,735FY2025 |
| Future of Life InstituteNarberth | Form 990 | $21,273,381FY2024 |
| Society for Industrial and Applied MathematicsPhiladelphia | Form 990 | $17,724,481FY2024 |
| Catalyst ConnectionPittsburgh | Form 990 | $13,475,224FY2025 |
| JCPDS International Centre for Diffraction DataNewtown Square | Form 990 | $12,040,457FY2025 |
| Stroud Water Research Center IncAvondale | Form 990 | $11,925,322FY2024 |
| National Cyber Forensics and Training AlliancePittsburgh | Form 990 | $11,281,815FY2025 |
| Minerals Metals & Materials Society IncPittsburgh | Form 990 | $10,031,886FY2025 |
| Iup Research InstituteIndiana | Form 990 | $9,654,077FY2025 |
| Science History InstitutePhiladelphia | Form 990 | $9,264,372FY2025 |
| Pittsburgh Conference on Analytic Chemistry & Applied SpectroscopyMonroeville | Form 990 | $4,976,142FY2025 |
| Lifex Greenhouse IncPittsburgh | Form 990 | $2,042,014FY2025 |
| Pennsylvania Center for Poultry and Livestock ExcellenceHarrisburg | Form 990 | $1,036,337FY2025 |
| Vytal Plant Science ResearchHarrisburg | Form 990 | $913,544FY2024 |
| Open Library FoundationPhiladelphia | Form 990 | $843,542FY2025 |
| Bighorn Basin Paleontological InstituteWillow Grove | Form 990 | $636,125FY2024 |
| Pennsylvania First RoboticsLandenberg | Form 990 | $414,311FY2025 |
| American Chemical SocietyUniversity Park | Form 990 | $381,215FY2025 |
| Sarah Mack Scicomm IncPhiladelphia | Form 990 | $300,680FY2025 |
| TecbridgeScranton | Form 990 | $280,201FY2025 |
| Electronic Materials ConferenceKennett Square | Form 990 | $237,364FY2024 |
| Crenshaw Institute for Applied Science and TechnologyWest Chester | Form 990 | $223,700FY2025 |
| International Society of Lyophilization-Freeze Drying IncGlenmoore | Form 990 | $218,503FY2024 |
| World Tumor Registry IncPittsburgh | Form 990 | $208,500FY2025 |
| Eastern Pa and Delaware Chapter Ofamerican Concrete InstituteHavertown | Form 990-EZ | $197,676FY2025 |
| International Society for Anthrozoology IncLancaster | Form 990-EZ | $192,738FY2025 |
| International Society for MicropilesEighty Four | Form 990-EZ | $176,988FY2025 |
| North American Society for Bat ResearchLewisburg | Form 990-EZ | $172,082FY2024 |
| Dhody Research InstituteOreland | Form 990-EZ | $159,484FY2024 |
| Three Rivers Information Security InstitutePenn Hills | Form 990-EZ | $157,596FY2025 |
| National Organization of Test Research and Training Reactors IncUniversity Park | Form 990-EZ | $136,116FY2025 |
| Lepidopterists SocietyBolivar | Form 990 | $126,677FY2025 |
| Punxsutawney Weather Center IncPunxsutawney | Form 990 | $121,484FY2025 |
| Optimo FoundationBloomsburg | Form 990-EZ | $99,105FY2025 |
| Teknowledge Worldwide CorpWarminster | Form 990-EZ | $92,465FY2024 |
| New Jersey Propane Education and Research FoundationHarrisburg | Form 990-EZ | $89,963FY2023 |
| Pittsburgh DataworksPittsburgh | Form 990-EZ | $79,992FY2025 |
| Society for Causal Learning and ReasoningWilkinsburg | Form 990-EZ | $73,590FY2025 |
| Society for Privacy and Confidentiality ResearchErie | Form 990-EZ | $59,191FY2025 |
| Partnership to Advance Responsible TechnologyPittsburgh | Form 990-EZ | $56,980FY2025 |
| ScienceandElkins Park | Form 990-EZ | $55,786FY2025 |
| Computer Ministry IncMechanicsburg | Form 990-EZ | $42,938FY2025 |
| Geophysical Society of PittsburghPittsburgh | Form 990-N | No figure |
| Society for the Study of Human DevelopmentWest Chester | Form 990-N | No figure |