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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 “circuits”

Where the money went

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The William Penn Foundation → Pennsylvania Environmental Council Inc: $3.7M across 6 grants, latest 2024Illinois Equal Justice Foundation → Dispute Resolution Institute: $2.4M across 4 grants, latest 2024The Simons Foundation Inc → Massachusetts General Hospital: $1.1M across 3 grants, latest 2024The Robert and Janice Mcnair Foundation → Bcm - Dr Barna Dudok: $1.0M across 2 grants, latest 2022The Paul G Allen Family Foundation → Trustees of Boston University: $1.0M across 2 grants, latest 2023Florida Council Against Sexual Violence → Office of the State Attorney 19th Judicial Circuit Sexual Assault Assistan: $992K across 3 grants, latest 2024Alfred P Sloan Foundation → Johns Hopkins University: $939K across 2 grants, latest 2023Illinois Association of Court Appointed → Casa of the 10th Judicial Circuit: $933K across 4 grants, latest 2024Alzheimer's Disease Research Foundation → Gladstone Institutes: $460K across 2 grants, latest 2025The Mcknight Endowment Fund for Neuroscience → New York University: $225K across 3 grants, latest 2024Lower Pearl River Valley Foundation → 15th Circuit Court Intervention Court Enhancement: $208K across 3 grants, latest 2024Guardian Trust Foundation Inc → Lutheran Services 12th and 13th Circuits: $120K across 3 grants, latest 2025The William Penn Foundation → Rails to Trails Conservancy: $1.9M across 10 grants, latest 2024The Simons Foundation Inc → Uc San Francisco: $1.0M across 3 grants, latest 2023The Paul G Allen Family Foundation → University of Florida: $1.0M across 2 grants, latest 2023Alfred P Sloan Foundation → University of Illinois Urbana-Champaign: $442K across 2 grants, latest 2024Alzheimer's Disease Research Foundation → Massachusetts General Hospital: $402K across 2 grants, latest 2025Illinois Association of Court Appointed → Casa 15th Judicial Circuit: $353K across 4 grants, latest 2024The Robert and Janice Mcnair Foundation → Bcm - Dr Ben Arenkiel: $200K across 2 grants, latest 2022The Mcknight Endowment Fund for Neuroscience → St Jude Children's Research Hospital: $200K across 2 grants, latest 2024Guardian Trust Foundation Inc → Fifth Circuit Public Guardian: $105K across 3 grants, latest 2024Lower Pearl River Valley Foundation → Lamar County Supervisors: $75K across 1 grant, latest 2021Florida Council Against Sexual Violence → Office of the State Attorneys 20th Judicial Circuit: $73K across 2 grants, latest 2023The William Penn Foundation → Bicycle Coalition of Greater Philadelphia: $1.3M across 5 grants, latest 2024The Paul G Allen Family Foundation → The Francis Crick Institute Limited: $984K across 2 grants, latest 2023The Simons Foundation Inc → Leland Stanford Junior University: $930K across 6 grants, latest 2023Alzheimer's Disease Research Foundation → Whitehead: $308K across 1 grant, latest 2022The Mcknight Endowment Fund for Neuroscience → Columbia University: $150K across 2 grants, latest 2023The Robert and Janice Mcnair Foundation → Bcm - Dr Nuo Li: $100K across 2 grants, latest 2022Alfred P Sloan Foundation → University of Texas Southwestern Medical Center at Dallas: $93K across 1 grant, latest 2024Guardian Trust Foundation Inc → Lutheran Services 1st Circuit: $70K across 2 grants, latest 2024Florida Council Against Sexual Violence → Office of the State Attorney 2nd Judicial Circuit: $68K across 2 grants, latest 2023The Simons Foundation Inc → Nyu School of Medicine: $923K across 6 grants, latest 2024The Simons Foundation Inc → Yale University: $830K across 4 grants, latest 2024The William Penn Foundation → Camden Community Partnership Inc: $821K across 2 grants, latest 2024The William Penn Foundation → New Jersey Conservation Foundation: $752K across 6 grants, latest 2024The William Penn Foundation → Cooper's Ferry Partnership: $745K across 2 grants, latest 2022The Simons Foundation Inc → Mit: $713K across 5 grants, latest 2024The William Penn Foundation → Tri-State Transportation Campaign: $653K across 4 grants, latest 2024The Simons Foundation Inc → Ucsf: $620K across 1 grant, latest 2024The William Penn Foundation → Brandywine Conservancy and Museum of Art: $590K across 4 grants, latest 2024The Simons Foundation Inc → Univ of California San Francisco: $553K across 3 grants, latest 2022The Simons Foundation Inc → Stanford University: $521K across 3 grants, latest 2024The Simons Foundation Inc → Albert Einstein College of Medicine: $518K across 3 grants, latest 2024The Simons Foundation Inc → Icahn School of Medicine: $420K across 4 grants, latest 2024The Simons Foundation Inc → New York University: $418K across 4 grants, latest 2024The Simons Foundation Inc → Carnegie Mellon University: $386K across 4 grants, latest 2024The Simons Foundation Inc → University of Chicago: $380K across 3 grants, latest 2024The Simons Foundation Inc → University of California San Diego: $314K across 2 grants, latest 2022The Simons Foundation Inc → Princeton University: $300K across 2 grants, latest 2023Alzheimer's Disease Research Foundation → Massachusetts Institute of Technology: $300K across 1 grant, latest 2023The Simons Foundation Inc → Duke University: $298K across 3 grants, latest 2024The Simons Foundation Inc → Ucsd: $294K across 2 grants, latest 2024The William Penn Foundation → Natural Lands Inc: $289K across 3 grants, latest 2024The Simons Foundation Inc → Champalimaud Foundation: $275K across 3 grants, latest 2024The Simons Foundation Inc → Mcgill University: $263K across 3 grants, latest 2024The Simons Foundation Inc → Uc Davis: $260K across 3 grants, latest 2024The Simons Foundation Inc → University of Washington: $249K across 1 grant, latest 2024Alzheimer's Disease Research Foundation → Beth Israel Deaconess Medical Center: $249K across 1 grant, latest 2022The Simons Foundation Inc → Salk Inst for Biological Studies: $239K across 1 grant, latest 2023The Simons Foundation Inc → Iob: $238K across 1 grant, latest 2023The Simons Foundation Inc → The University of Chicago: $223K across 2 grants, latest 2022Alzheimer's Disease Research Foundation → Carnegie Mellon: $200K across 1 grant, latest 2022The Simons Foundation Inc → University of Pittsburgh: $180K across 2 grants, latest 2024The Simons Foundation Inc: $12M on this topic. Open the funder.The Simons Foundation Inc$12MThe William Penn Foundation: $11M on this topic. Open the funder.The William Penn Foundation$11MThe Paul G Allen Family Foundation: $3.0M on this topic. Open the funder.The Paul G Allen Family Found…$3.0MIllinois Equal Justice Foundation: $2.4M on this topic. Open the funder.Illinois Equal Justice Founda…$2.4MAlzheimer's Disease Research Foundation: $1.9M on this topic. Open the funder.Alzheimer's Disease Research…$1.9MAlfred P Sloan Foundation: $1.5M on this topic. Open the funder.Alfred P Sloan Foundation$1.5MThe Robert and Janice Mcnair Foundation: $1.3M on this topic. Open the funder.The Robert and Janice Mcnair…$1.3MIllinois Association of Court Appointed: $1.3M on this topic. Open the funder.Illinois Association of Court…$1.3MFlorida Council Against Sexual Violence: $1.1M on this topic. Open the funder.Florida Council Against Sexua…$1.1MThe Mcknight Endowment Fund for Neuroscience: $575K on this topic. Open the funder.The Mcknight Endowment Fund f…$575KGuardian Trust Foundation Inc: $295K on this topic. Open the funder.Guardian Trust Foundation Inc$295KLower Pearl River Valley Foundation: $283K on this topic. Open the funder.Lower Pearl River Valley Foun…$283KPennsylvania Environmental Council Inc: received $3.7M on this topicPennsylvania Environmental Coun…$3.7MDispute Resolution Institute: received $2.4M on this topicDispute Resolution Institute$2.4MRails to Trails Conservancy: received $1.9M on this topicRails to Trails Conservancy$1.9MMassachusetts General Hospital: received $1.5M on this topicMassachusetts General Hospital$1.5MBicycle Coalition of Greater Philadelphia: received $1.3M on this topicBicycle Coalition of Greater Ph…$1.3MUc San Francisco: received $1.0M on this topicUc San Francisco$1.0MBcm - Dr Barna Dudok: received $1.0M on this topicBcm - Dr Barna Dudok$1.0MTrustees of Boston University: received $1.0M on this topicTrustees of Boston University$1.0MUniversity of Florida: received $1.0M on this topicUniversity of Florida$1.0MOffice of the State Attorney 19th Judicial Circuit Sexual Assault Assistan: received $992K on this topicOffice of the State Attorney 19…$992KThe Francis Crick Institute Limited: received $984K on this topicThe Francis Crick Institute Lim…$984KJohns Hopkins University: received $939K on this topicJohns Hopkins University$939KCasa of the 10th Judicial Circuit: received $933K on this topicCasa of the 10th Judicial Circu…$933KLeland Stanford Junior University: received $930K on this topicLeland Stanford Junior Universi…$930KNyu School of Medicine: received $923K on this topicNyu School of Medicine$923KYale University: received $830K on this topicYale University$830KCamden Community Partnership Inc: received $821K on this topicCamden Community Partnership Inc$821KNew Jersey Conservation Foundation: received $752K on this topicNew Jersey Conservation Foundat…$752KCooper's Ferry Partnership: received $745K on this topicCooper's Ferry Partnership$745KMit: received $713K on this topicMit$713KTri-State Transportation Campaign: received $653K on this topicTri-State Transportation Campai…$653KUcsf: received $620K on this topicUcsf$620KBrandywine Conservancy and Museum of Art: received $590K on this topicBrandywine Conservancy and Muse…$590KUniv of California San Francisco: received $553K on this topicUniv of California San Francisco$553KStanford University: received $521K on this topicStanford University$521KAlbert Einstein College of Medicine: received $518K on this topicAlbert Einstein College of Medi…$518KGladstone Institutes: received $460K on this topicGladstone Institutes$460KUniversity of Illinois Urbana-Champaign: received $442K on this topicUniversity of Illinois Urbana-C…$442KIcahn School of Medicine: received $420K on this topicIcahn School of Medicine$420KNew York University: received $418K on this topicNew York University$418KCarnegie Mellon University: received $386K on this topicCarnegie Mellon University$386KUniversity of Chicago: received $380K on this topicUniversity of Chicago$380KCasa 15th Judicial Circuit: received $353K on this topicCasa 15th Judicial Circuit$353KUniversity of California San Diego: received $314K on this topicUniversity of California San Di…$314KWhitehead: received $308K on this topicWhitehead$308KPrinceton University: received $300K on this topicPrinceton University$300KMassachusetts Institute of Technology: received $300K on this topicMassachusetts Institute of Tech…$300KDuke University: received $298K on this topicDuke University$298KUcsd: received $294K on this topicUcsd$294KNatural Lands Inc: received $289K on this topicNatural Lands Inc$289KChampalimaud Foundation: received $275K on this topicChampalimaud Foundation$275KMcgill University: received $263K on this topicMcgill University$263KUc Davis: received $260K on this topicUc Davis$260KUniversity of Washington: received $249K on this topicUniversity of Washington$249KBeth Israel Deaconess Medical Center: received $249K on this topicBeth Israel Deaconess Medical C…$249KSalk Inst for Biological Studies: received $239K on this topicSalk Inst for Biological Studies$239KIob: received $238K on this topicIob$238KNew York University: received $225K on this topicNew York University$225KThe University of Chicago: received $223K on this topicThe University of Chicago$223K15th Circuit Court Intervention Court Enhancement: received $208K on this topic15th Circuit Court Intervention…$208KBcm - Dr Ben Arenkiel: received $200K on this topicBcm - Dr Ben Arenkiel$200KSt Jude Children's Research Hospital: received $200K on this topicSt Jude Children's Research Hos…$200KCarnegie Mellon: received $200K on this topicCarnegie Mellon$200KUniversity of Pittsburgh: received $180K on this topicUniversity of Pittsburgh$180KColumbia University: received $150K on this topicColumbia University$150KLutheran Services 12th and 13th Circuits: received $120K on this topicLutheran Services 12th and 13th…$120KFifth Circuit Public Guardian: received $105K on this topicFifth Circuit Public Guardian$105KBcm - Dr Nuo Li: received $100K on this topicBcm - Dr Nuo Li$100KUniversity of Texas Southwestern Medical Center at Dallas: received $93K on this topicUniversity of Texas Southwester…$93KLamar County Supervisors: received $75K on this topicLamar County Supervisors$75KOffice of the State Attorneys 20th Judicial Circuit: received $73K on this topicOffice of the State Attorneys 2…$73KLutheran Services 1st Circuit: received $70K on this topicLutheran Services 1st Circuit$70KOffice of the State Attorney 2nd Judicial Circuit: received $68K on this topicOffice of the State Attorney 2n…$68K
12 funders, 63 recipients, grants matching “circuits” 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 20192025. 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 →