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Private foundations don’t post open calls, so nobody can search them. We read IRS filings instead — 9.6 million grants from 174,053 foundations and grantmaking charities, searchable by what the money was actually for.

12 funders with a record of paying for “observatory”

Where the money went

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The Simons Foundation Inc → University of California San Diego: $27M across 1 grant, latest 2022Gordon E and Betty I Moore Foundation → Regents of the University of California: $11M across 7 grants, latest 2024Association of Universities for Research → Smithsonian Institution Astrophysical Observatory: $2.3M across 3 grants, latest 2023The Heising-Simons Foundation → Las Cumbres Observatory Global Telescope Network Inc: $2.1M across 2 grants, latest 2024National Fish and Wildlife Foundation → Rocky Mountain Bird Observatory: $1.8M across 2 grants, latest 2022The Ford Foundation → Organisation for Economic Co-Operation and Development: $1.0M across 3 grants, latest 2024The San Francisco Foundation → Uc Santa Cruz Foundation: $986K across 3 grants, latest 2023California Association for Research in → Uc Santa Cruz Foundation: $922K across 3 grants, latest 2023The Nature Conservancy → Point Reyes Bird Observatory: $695K across 3 grants, latest 2024Foundation to Promote Open Society → Ecole D'economie De Paris: $600K across 1 grant, latest 2024The Brinson Foundation → Carnegie Institution for Science Carnegie Observatories Instrumentation Pro: $468K across 5 grants, latest 2024The Kenneth T and Eileen L Norris → Mount Wilson Institute: $250K across 3 grants, latest 2023The Simons Foundation Inc → Uc San Diego: $13M across 1 grant, latest 2023Gordon E and Betty I Moore Foundation → Smithsonian Institution: $3.4M across 1 grant, latest 2024The Heising-Simons Foundation → Regents of the University of California at San Diego: $1.5M across 1 grant, latest 2023National Fish and Wildlife Foundation → Rocky Mountain Bird Observatory Dba Bird Conservancy of the Rockies: $1.0M across 1 grant, latest 2023The Ford Foundation → Center of Security and Citizenship Studies - Cesec: $815K across 3 grants, latest 2024California Association for Research in → California Institute of Technology: $535K across 2 grants, latest 2023Foundation to Promote Open Society → United Nations Economic Commission for Latin Ameri: $500K across 1 grant, latest 2022The San Francisco Foundation → Pt Reyes Bird Observatory: $395K across 2 grants, latest 2022Association of Universities for Research → Lowell Observatory: $211K across 3 grants, latest 2023The Brinson Foundation → Smithsonian Astrophysical Observatory: $192K across 3 grants, latest 2024The Kenneth T and Eileen L Norris → Carnegie Observatories of the Carnegie Institution for Science: $125K across 4 grants, latest 2024The Nature Conservancy → Klamath Bird Observatory: $107K across 4 grants, latest 2023The Heising-Simons Foundation → California Institute of Technology: $1.5M across 3 grants, latest 2024Gordon E and Betty I Moore Foundation → California Association for Research in Astronomy: $1.4M across 1 grant, latest 2022The Simons Foundation Inc → Ucsd: $597K across 1 grant, latest 2024Foundation to Promote Open Society → Armed Conflict Location and Event Data Project: $400K across 1 grant, latest 2023The Ford Foundation → Associacao Paranaense De Cultura (Pontificia Universidade Catolica Do Paran: $300K across 2 grants, latest 2024National Fish and Wildlife Foundation → San Francisco Bay Bird Observatory: $270K across 3 grants, latest 2023The San Francisco Foundation → Pt Reyes Bird Observatory Dba Pt Blue Conservation Science: $178K across 1 grant, latest 2023Association of Universities for Research → Catholic University of America: $177K across 1 grant, latest 2022The Brinson Foundation → Trustees of Columbia University in the City of New York Columbia University: $147K across 2 grants, latest 2024The Nature Conservancy → Rocky Mountain Bird Observatory: $48K across 2 grants, latest 2021California Association for Research in → University of California Berkeley: $45K across 1 grant, latest 2021The Heising-Simons Foundation → Lowell Observatory: $950K across 1 grant, latest 2022Gordon E and Betty I Moore Foundation → California Institute of Technology: $900K across 1 grant, latest 2020Gordon E and Betty I Moore Foundation → Massachusetts Institute of Technology: $900K across 1 grant, latest 2022The Heising-Simons Foundation → Arizona Board of Regents University of Arizona: $600K across 1 grant, latest 2024Gordon E and Betty I Moore Foundation → Northwestern University: $497K across 2 grants, latest 2024Gordon E and Betty I Moore Foundation → University of Hawaii Foundation: $496K across 1 grant, latest 2020Gordon E and Betty I Moore Foundation → California Institute of Technology: $487K across 2 grants, latest 2023The Simons Foundation Inc → University of Oslo: $458K across 3 grants, latest 2024Gordon E and Betty I Moore Foundation → Las Cumbres Observatory Global Telescope Network Inc: $363K across 1 grant, latest 2022The Ford Foundation → Insuco Colombia Sas: $270K across 3 grants, latest 2024The Ford Foundation → Centro De Derecho De Mujeres: $225K across 2 grants, latest 2023The Ford Foundation → Tunisian Observatory of the Economy: $200K across 2 grants, latest 2023Foundation to Promote Open Society → Raqabah Observatory: $200K across 1 grant, latest 2022Foundation to Promote Open Society → Debt Observatory in Globalization: $200K across 1 grant, latest 2024The Ford Foundation → Fundacion Paz Y Reconciliacion: $200K across 1 grant, latest 2022The Ford Foundation → Fundacion Propaz (Ong): $190K across 3 grants, latest 2024The Ford Foundation → Universidade Federal Do Rio De Janeiro: $180K across 2 grants, latest 2024The Heising-Simons Foundation → California Association for Research in Astronomy: $175K across 1 grant, latest 2022The San Francisco Foundation → Point Reyes Bird Observatory: $167K across 1 grant, latest 2024The Ford Foundation → Open Observatory of Network Interference Foundation Ets: $155K across 1 grant, latest 2024Foundation to Promote Open Society → Central European University: $150K across 1 grant, latest 2022Foundation to Promote Open Society → Corporate Europe Observatory: $150K across 1 grant, latest 2024National Fish and Wildlife Foundation → Western Great Lakes Bird and Bat Observatory: $119K across 1 grant, latest 2023The Brinson Foundation → Carnegie Institution for Science: $115K across 1 grant, latest 2022The San Francisco Foundation → Golden Gate National Parks Conservancy: $115K across 1 grant, latest 2023The Heising-Simons Foundation → University of Oregon: $90K across 1 grant, latest 2024Association of Universities for Research → New Mexico State University: $88K across 1 grant, latest 2022Association of Universities for Research → Las Cumbres Observatory Global Telescope Network: $83K across 2 grants, latest 2023Foundation to Promote Open Society → New America Foundation: $75K across 1 grant, latest 2022The Simons Foundation Inc: $40M on this topic. Open the funder.The Simons Foundation Inc$40MGordon E and Betty I Moore Foundation: $20M on this topic. Open the funder.Gordon E and Betty I Moore Fo…$20MThe Heising-Simons Foundation: $6.9M on this topic. Open the funder.The Heising-Simons Foundation$6.9MThe Ford Foundation: $3.5M on this topic. Open the funder.The Ford Foundation$3.5MNational Fish and Wildlife Foundation: $3.3M on this topic. Open the funder.National Fish and Wildlife Fo…$3.3MAssociation of Universities for Research: $2.9M on this topic. Open the funder.Association of Universities f…$2.9MFoundation to Promote Open Society: $2.3M on this topic. Open the funder.Foundation to Promote Open So…$2.3MThe San Francisco Foundation: $1.8M on this topic. Open the funder.The San Francisco Foundation$1.8MCalifornia Association for Research in: $1.5M on this topic. Open the funder.California Association for Re…$1.5MThe Brinson Foundation: $922K on this topic. Open the funder.The Brinson Foundation$922KThe Nature Conservancy: $849K on this topic. Open the funder.The Nature Conservancy$849KThe Kenneth T and Eileen L Norris: $375K on this topic. Open the funder.The Kenneth T and Eileen L No…$375KUniversity of California San Diego: received $27M on this topicUniversity of California San Di…$27MUc San Diego: received $13M on this topicUc San Diego$13MRegents of the University of California: received $11M on this topicRegents of the University of Ca…$11MSmithsonian Institution: received $3.4M on this topicSmithsonian Institution$3.4MCalifornia Institute of Technology: received $2.5M on this topicCalifornia Institute of Technol…$2.5MLas Cumbres Observatory Global Telescope Network Inc: received $2.5M on this topicLas Cumbres Observatory Global…$2.5MSmithsonian Institution Astrophysical Observatory: received $2.3M on this topicSmithsonian Institution Astroph…$2.3MUc Santa Cruz Foundation: received $1.9M on this topicUc Santa Cruz Foundation$1.9MRocky Mountain Bird Observatory: received $1.9M on this topicRocky Mountain Bird Observatory$1.9MCalifornia Association for Research in Astronomy: received $1.6M on this topicCalifornia Association for Rese…$1.6MRegents of the University of California at San Diego: received $1.5M on this topicRegents of the University of Ca…$1.5MLowell Observatory: received $1.2M on this topicLowell Observatory$1.2MRocky Mountain Bird Observatory Dba Bird Conservancy of the Rockies: received $1.0M on this topicRocky Mountain Bird Observatory…$1.0MOrganisation for Economic Co-Operation and Development: received $1.0M on this topicOrganisation for Economic Co-Op…$1.0MCalifornia Institute of Technology: received $900K on this topicCalifornia Institute of Technol…$900KMassachusetts Institute of Technology: received $900K on this topicMassachusetts Institute of Tech…$900KPoint Reyes Bird Observatory: received $861K on this topicPoint Reyes Bird Observatory$861KCenter of Security and Citizenship Studies - Cesec: received $815K on this topicCenter of Security and Citizens…$815KEcole D'economie De Paris: received $600K on this topicEcole D'economie De Paris$600KArizona Board of Regents University of Arizona: received $600K on this topicArizona Board of Regents Univer…$600KUcsd: received $597K on this topicUcsd$597KUnited Nations Economic Commission for Latin Ameri: received $500K on this topicUnited Nations Economic Commiss…$500KNorthwestern University: received $497K on this topicNorthwestern University$497KUniversity of Hawaii Foundation: received $496K on this topicUniversity of Hawaii Foundation$496KCarnegie Institution for Science Carnegie Observatories Instrumentation Pro: received $468K on this topicCarnegie Institution for Scienc…$468KUniversity of Oslo: received $458K on this topicUniversity of Oslo$458KArmed Conflict Location and Event Data Project: received $400K on this topicArmed Conflict Location and Eve…$400KPt Reyes Bird Observatory: received $395K on this topicPt Reyes Bird Observatory$395KAssociacao Paranaense De Cultura (Pontificia Universidade Catolica Do Paran: received $300K on this topicAssociacao Paranaense De Cultur…$300KSan Francisco Bay Bird Observatory: received $270K on this topicSan Francisco Bay Bird Observat…$270KInsuco Colombia Sas: received $270K on this topicInsuco Colombia Sas$270KMount Wilson Institute: received $250K on this topicMount Wilson Institute$250KCentro De Derecho De Mujeres: received $225K on this topicCentro De Derecho De Mujeres$225KTunisian Observatory of the Economy: received $200K on this topicTunisian Observatory of the Eco…$200KRaqabah Observatory: received $200K on this topicRaqabah Observatory$200KDebt Observatory in Globalization: received $200K on this topicDebt Observatory in Globalizati…$200KFundacion Paz Y Reconciliacion: received $200K on this topicFundacion Paz Y Reconciliacion$200KSmithsonian Astrophysical Observatory: received $192K on this topicSmithsonian Astrophysical Obser…$192KFundacion Propaz (Ong): received $190K on this topicFundacion Propaz (Ong)$190KUniversidade Federal Do Rio De Janeiro: received $180K on this topicUniversidade Federal Do Rio De…$180KPt Reyes Bird Observatory Dba Pt Blue Conservation Science: received $178K on this topicPt Reyes Bird Observatory Dba P…$178KCatholic University of America: received $177K on this topicCatholic University of America$177KOpen Observatory of Network Interference Foundation Ets: received $155K on this topicOpen Observatory of Network Int…$155KCentral European University: received $150K on this topicCentral European University$150KCorporate Europe Observatory: received $150K on this topicCorporate Europe Observatory$150KTrustees of Columbia University in the City of New York Columbia University: received $147K on this topicTrustees of Columbia University…$147KCarnegie Observatories of the Carnegie Institution for Science: received $125K on this topicCarnegie Observatories of the C…$125KWestern Great Lakes Bird and Bat Observatory: received $119K on this topicWestern Great Lakes Bird and Ba…$119KCarnegie Institution for Science: received $115K on this topicCarnegie Institution for Science$115KGolden Gate National Parks Conservancy: received $115K on this topicGolden Gate National Parks Cons…$115KKlamath Bird Observatory: received $107K on this topicKlamath Bird Observatory$107KUniversity of Oregon: received $90K on this topicUniversity of Oregon$90KNew Mexico State University: received $88K on this topicNew Mexico State University$88KLas Cumbres Observatory Global Telescope Network: received $83K on this topicLas Cumbres Observatory Global…$83KNew America Foundation: received $75K on this topicNew America Foundation$75KUniversity of California Berkeley: received $45K on this topicUniversity of California Berkel…$45K
12 funders, 56 recipients, grants matching “observatory” only. Ribbon width is proportional to the total given; each funder has its own colour (smaller funders in gray). Hover a name to isolate its flows, click a funder to open it. Drag to move around; zoom with the buttons, a double-click, or the wheel after clicking the map.

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Source: IRS Form 990-PF Part XV and Form 990 Schedule I, tax years 2019–2025. These are grants already paid, a record of what an organization funds rather than an open call. Private foundations rarely accept unsolicited applications and the route in is usually a program officer; grantmaking charities and associations more often run real application cycles, so check their website. How this data is built, and its limits →