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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 “marker”

Where the money went

1.0×
Oclo Inc → Ideas Charitable Program: $3.1M across 2 grants, latest 2023The Leona M and Harry B Helmsley → Amc Medical Research Bv: $1.6M across 1 grant, latest 2023The Andrew W Mellon Foundation → Middle Passage Ceremonies and Port Markers Project Inc: $575K across 2 grants, latest 2024Alzheimer's Disease Research Foundation → Duke University School of Medicine: $575K across 3 grants, latest 2025The Simons Foundation Inc → University of Sussex: $418K across 2 grants, latest 2024Names Family Foundation → The Michael J Fox Foundation: $315K across 3 grants, latest 2023The William G Pomeroy Foundation → The Lafayette Trail Inc: $301K across 4 grants, latest 2024Van Strum Foundation 8833023 → Channel Marker Foundation: $250K across 1 grant, latest 2022The Caroline Foundation Inc → Channel Marker: $90K across 4 grants, latest 2024Arkansas Community Foundation Inc → Onida Cemetery Association - Po Box 265 Onida Sd 57564: $64K across 3 grants, latest 2024Minnesota Historical Society → Carver County Historical Society: $56K across 2 grants, latest 2024The Rhode Island Community Foundation → Newport Middle Passage Port Marker Project: $20K across 1 grant, latest 2024The Leona M and Harry B Helmsley → Amsterdam Umc Research Bv: $1.5M across 1 grant, latest 2024The Andrew W Mellon Foundation → Los Angeles City Planning Office of Historic Resources: $500K across 1 grant, latest 2024The William G Pomeroy Foundation → National Collaborative for Women's History Sites: $177K across 2 grants, latest 2022Van Strum Foundation 8833023 → Channel Marker Inc: $172K across 3 grants, latest 2025Arkansas Community Foundation Inc → Evergreen Cemetery Fayetteville Ar - 2417 E Bristol Place Fayetteville A: $64K across 3 grants, latest 2024Minnesota Historical Society → City of Duluth: $50K across 1 grant, latest 2023The Simons Foundation Inc → University of London: $48K across 1 grant, latest 2023Names Family Foundation → University of Washington Foundation: $25K across 1 grant, latest 2023The Rhode Island Community Foundation → Newport Middle Passage and Port Marker Project: $10K across 1 grant, latest 2023The Leona M and Harry B Helmsley → Tampere University Foundation Sr: $305K across 1 grant, latest 2021The William G Pomeroy Foundation → Ohio History Connection: $104K across 4 grants, latest 2024The Andrew W Mellon Foundation → Colorado Asian Culture and Education Network: $100K across 1 grant, latest 2022The Simons Foundation Inc → Birkbeck University of London: $34K across 1 grant, latest 2024Minnesota Historical Society → White Bear Lake Area Historical Society: $20K across 1 grant, latest 2021Arkansas Community Foundation Inc → Quapaw Quarter Association - P O Box 165023 Little Rock Ar 72216: $12K across 1 grant, latest 2022The Rhode Island Community Foundation → Bristol Middle Passage Port Marker Project Inc: $10K across 1 grant, latest 2024The William G Pomeroy Foundation → Columbia-Mid Hudson Valley Sar Chapter: $77K across 3 grants, latest 2024The William G Pomeroy Foundation → Rails-to-Trails Conservancy: $50K across 1 grant, latest 2023The William G Pomeroy Foundation → Nsdar - Treasurer General: $41K across 2 grants, latest 2024The William G Pomeroy Foundation → Illinois State Historical Society: $40K across 3 grants, latest 2023The William G Pomeroy Foundation → State Historical Society of Iowa: $30K across 2 grants, latest 2022The William G Pomeroy Foundation → Indiana Society Sons of the American Revolution: $25K across 2 grants, latest 2024The William G Pomeroy Foundation → Indiana Historical Bureau: $25K across 1 grant, latest 2024The William G Pomeroy Foundation → Onondaga Historical Association: $24K across 2 grants, latest 2024The William G Pomeroy Foundation → Nj Society Sons of the American Revolution: $24K across 3 grants, latest 2024The William G Pomeroy Foundation → Chenango Chapter - Nys Archaeological Association: $21K across 4 grants, latest 2024The William G Pomeroy Foundation → Nc African American Heritage Commissionnc Dept of Naturaal and Cultural R: $21K across 1 grant, latest 2023The William G Pomeroy Foundation → Warsaw Historical Society and the Gates House Museum: $20K across 4 grants, latest 2024The William G Pomeroy Foundation → Empire State Society Sons of the American Revolution Thousand Islands Chapt: $19K across 2 grants, latest 2022The William G Pomeroy Foundation → Sons of the American Revolution - Syracuse Chapter: $19K across 3 grants, latest 2023The William G Pomeroy Foundation → Wisconsin Historical Foundation: $19K across 2 grants, latest 2024The William G Pomeroy Foundation → Sons of the American Revolution - Empire State Society - Chautauqua Chapter: $15K across 4 grants, latest 2024The William G Pomeroy Foundation → State of Michigan: $13K across 1 grant, latest 2024The William G Pomeroy Foundation → Binghamton Chapter Esssar: $12K across 4 grants, latest 2024The William G Pomeroy Foundation → Austerlitz Historical Society: $12K across 2 grants, latest 2023The William G Pomeroy Foundation → Rochester Chapter Sons of the American Revolution: $12K across 3 grants, latest 2023The William G Pomeroy Foundation → Owego Hose Teams Inc: $11K across 1 grant, latest 2021The William G Pomeroy Foundation → Sons of Union Veterans of the Civil War Abraham Lincoln Camp 6 Rochester Ny: $11K across 4 grants, latest 2024The William G Pomeroy Foundation → Greater Oneonta Historical Society: $11K across 2 grants, latest 2024The William G Pomeroy Foundation → Guilderland Historical Society: $11K across 3 grants, latest 2024The William G Pomeroy Foundation → Auglaize County Historical Society: $10K across 3 grants, latest 2024The William G Pomeroy Foundation → Great American Rail-Trail Historical Marker Program: $10K across 1 grant, latest 2022The William G Pomeroy Foundation → Historic Smithfield: $10K across 1 grant, latest 2023Minnesota Historical Society → Lower Sioux Indian Community: $10K across 1 grant, latest 2024Minnesota Historical Society → True Directions Inc: $10K across 1 grant, latest 2022The William G Pomeroy Foundation → Tennessee Valley Chapter - Sons of the American Revolution - Alabama: $9K across 1 grant, latest 2023The Rhode Island Community Foundation → Sowams Heritage Area Project Inc: $9K across 1 grant, latest 2022The William G Pomeroy Foundation → Town of Warsaw: $9K across 2 grants, latest 2024The William G Pomeroy Foundation → Town of Dekalb: $8K across 3 grants, latest 2024The William G Pomeroy Foundation → Syracuse Regional Museum: $8K across 1 grant, latest 2022The William G Pomeroy Foundation → Millbrook Historical Society: $8K across 1 grant, latest 2024The William G Pomeroy Foundation → Town of Lodi: $8K across 2 grants, latest 2023The Leona M and Harry B Helmsley: $3.4M on this topic. Open the funder.The Leona M and Harry B Helms…$3.4MOclo Inc: $3.1M on this topic. Open the funder.Oclo Inc$3.1MThe William G Pomeroy Foundation: $1.2M on this topic. Open the funder.The William G Pomeroy Foundat…$1.2MThe Andrew W Mellon Foundation: $1.2M on this topic. Open the funder.The Andrew W Mellon Foundation$1.2MAlzheimer's Disease Research Foundation: $575K on this topic. Open the funder.Alzheimer's Disease Research…$575KThe Simons Foundation Inc: $500K on this topic. Open the funder.The Simons Foundation Inc$500KVan Strum Foundation 8833023: $422K on this topic. Open the funder.Van Strum Foundation 8833023$422KNames Family Foundation: $340K on this topic. Open the funder.Names Family Foundation$340KMinnesota Historical Society: $145K on this topic. Open the funder.Minnesota Historical Society$145KArkansas Community Foundation Inc: $140K on this topic. Open the funder.Arkansas Community Foundation…$140KThe Caroline Foundation Inc: $90K on this topic. Open the funder.The Caroline Foundation Inc$90KThe Rhode Island Community Foundation: $49K on this topic. Open the funder.The Rhode Island Community Fo…$49KIdeas Charitable Program: received $3.1M on this topicIdeas Charitable Program$3.1MAmc Medical Research Bv: received $1.6M on this topicAmc Medical Research Bv$1.6MAmsterdam Umc Research Bv: received $1.5M on this topicAmsterdam Umc Research Bv$1.5MMiddle Passage Ceremonies and Port Markers Project Inc: received $575K on this topicMiddle Passage Ceremonies and P…$575KDuke University School of Medicine: received $575K on this topicDuke University School of Medic…$575KLos Angeles City Planning Office of Historic Resources: received $500K on this topicLos Angeles City Planning Offic…$500KUniversity of Sussex: received $418K on this topicUniversity of Sussex$418KThe Michael J Fox Foundation: received $315K on this topicThe Michael J Fox Foundation$315KTampere University Foundation Sr: received $305K on this topicTampere University Foundation Sr$305KThe Lafayette Trail Inc: received $301K on this topicThe Lafayette Trail Inc$301KChannel Marker Foundation: received $250K on this topicChannel Marker Foundation$250KNational Collaborative for Women's History Sites: received $177K on this topicNational Collaborative for Wome…$177KChannel Marker Inc: received $172K on this topicChannel Marker Inc$172KOhio History Connection: received $104K on this topicOhio History Connection$104KColorado Asian Culture and Education Network: received $100K on this topicColorado Asian Culture and Educ…$100KChannel Marker: received $90K on this topicChannel Marker$90KColumbia-Mid Hudson Valley Sar Chapter: received $77K on this topicColumbia-Mid Hudson Valley Sar…$77KOnida Cemetery Association - Po Box 265 Onida Sd 57564: received $64K on this topicOnida Cemetery Association - Po…$64KEvergreen Cemetery Fayetteville Ar - 2417 E Bristol Place Fayetteville A: received $64K on this topicEvergreen Cemetery Fayetteville…$64KCarver County Historical Society: received $56K on this topicCarver County Historical Society$56KRails-to-Trails Conservancy: received $50K on this topicRails-to-Trails Conservancy$50KCity of Duluth: received $50K on this topicCity of Duluth$50KUniversity of London: received $48K on this topicUniversity of London$48KNsdar - Treasurer General: received $41K on this topicNsdar - Treasurer General$41KIllinois State Historical Society: received $40K on this topicIllinois State Historical Socie…$40KBirkbeck University of London: received $34K on this topicBirkbeck University of London$34KState Historical Society of Iowa: received $30K on this topicState Historical Society of Iowa$30KUniversity of Washington Foundation: received $25K on this topicUniversity of Washington Founda…$25KIndiana Society Sons of the American Revolution: received $25K on this topicIndiana Society Sons of the Ame…$25KIndiana Historical Bureau: received $25K on this topicIndiana Historical Bureau$25KOnondaga Historical Association: received $24K on this topicOnondaga Historical Association$24KNj Society Sons of the American Revolution: received $24K on this topicNj Society Sons of the American…$24KChenango Chapter - Nys Archaeological Association: received $21K on this topicChenango Chapter - Nys Archaeol…$21KNc African American Heritage Commissionnc Dept of Naturaal and Cultural R: received $21K on this topicNc African American Heritage Co…$21KNewport Middle Passage Port Marker Project: received $20K on this topicNewport Middle Passage Port Mar…$20KWhite Bear Lake Area Historical Society: received $20K on this topicWhite Bear Lake Area Historical…$20KWarsaw Historical Society and the Gates House Museum: received $20K on this topicWarsaw Historical Society and t…$20KEmpire State Society Sons of the American Revolution Thousand Islands Chapt: received $19K on this topicEmpire State Society Sons of th…$19KSons of the American Revolution - Syracuse Chapter: received $19K on this topicSons of the American Revolution…$19KWisconsin Historical Foundation: received $19K on this topicWisconsin Historical Foundation$19KSons of the American Revolution - Empire State Society - Chautauqua Chapter: received $15K on this topicSons of the American Revolution…$15KState of Michigan: received $13K on this topicState of Michigan$13KBinghamton Chapter Esssar: received $12K on this topicBinghamton Chapter Esssar$12KAusterlitz Historical Society: received $12K on this topicAusterlitz Historical Society$12KRochester Chapter Sons of the American Revolution: received $12K on this topicRochester Chapter Sons of the A…$12KQuapaw Quarter Association - P O Box 165023 Little Rock Ar 72216: received $12K on this topicQuapaw Quarter Association - P…$12KOwego Hose Teams Inc: received $11K on this topicOwego Hose Teams Inc$11KSons of Union Veterans of the Civil War Abraham Lincoln Camp 6 Rochester Ny: received $11K on this topicSons of Union Veterans of the C…$11KGreater Oneonta Historical Society: received $11K on this topicGreater Oneonta Historical Soci…$11KGuilderland Historical Society: received $11K on this topicGuilderland Historical Society$11KAuglaize County Historical Society: received $10K on this topicAuglaize County Historical Soci…$10KNewport Middle Passage and Port Marker Project: received $10K on this topicNewport Middle Passage and Port…$10KBristol Middle Passage Port Marker Project Inc: received $10K on this topicBristol Middle Passage Port Mar…$10KGreat American Rail-Trail Historical Marker Program: received $10K on this topicGreat American Rail-Trail Histo…$10KHistoric Smithfield: received $10K on this topicHistoric Smithfield$10KLower Sioux Indian Community: received $10K on this topicLower Sioux Indian Community$10KTrue Directions Inc: received $10K on this topicTrue Directions Inc$10KTennessee Valley Chapter - Sons of the American Revolution - Alabama: received $9K on this topicTennessee Valley Chapter - Sons…$9KSowams Heritage Area Project Inc: received $9K on this topicSowams Heritage Area Project Inc$9KTown of Warsaw: received $9K on this topicTown of Warsaw$9KTown of Dekalb: received $8K on this topicTown of Dekalb$8KSyracuse Regional Museum: received $8K on this topicSyracuse Regional Museum$8KMillbrook Historical Society: received $8K on this topicMillbrook Historical Society$8KTown of Lodi: received $8K on this topicTown of Lodi$8K
12 funders, 64 recipients, grants matching “marker” 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 →