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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 “tunnel”

Where the money went

1.0×
The San Francisco Foundation → Harvard University: $8.0M across 2 grants, latest 2022Give Back Foundation → Stephen Siller Tunnel to Towers Foundation: $1.1M across 3 grants, latest 2025Gordon E and Betty I Moore Foundation → Trustees of Princeton University: $972K across 3 grants, latest 2024The Gregory and Claire Wilcox → Tunnel to Towers Foundation: $770K across 5 grants, latest 2025The Iott Family Foundation → Tunnel to Towers: $400K across 4 grants, latest 2025Amg Charitable Gift Foundation → Stephen Siller Tunnel to Towers Foundation: $132K across 23 grants, latest 2024Seattle Foundation → Tunnels to Towers Foundation: $86K across 11 grants, latest 2024The Bank of America Charitable → Stephen Siller Tunnel to Towers F: $77K across 23 grants, latest 2023The Minneapolis Foundation → Stephen Stiller Tunnel to Towers Foundation: $57K across 2 grants, latest 2022Bristol-Myers Squibb Foundation Inc → Stephen Siller Tunnel to Towers Foundation: $35K across 9 grants, latest 2023Verizon Foundation → Stephen Siller Tunnel to Towers Foundation: $28K across 8 grants, latest 2024Enterprise Holdings Foundation → Stephen Siller Tunnel to Towers: $8K across 5 grants, latest 2023Gordon E and Betty I Moore Foundation → Cornell University: $936K across 3 grants, latest 2024Give Back Foundation → Tunnel to Towers Foundation (Stephen Siller Tunnel to Towers Foundation): $354K across 1 grant, latest 2024The Bank of America Charitable → Stephen Siller Tunnel to Towers Fo: $73K across 21 grants, latest 2022The Minneapolis Foundation → Stephen Siller Tunnel to Towers Foundation: $31K across 2 grants, latest 2024Enterprise Holdings Foundation → Tunnels to Towers Foundation: $6K across 3 grants, latest 2023Gordon E and Betty I Moore Foundation → The Board of Trustees of the University of Illinois: $935K across 3 grants, latest 2024The Minneapolis Foundation → Tunnels to Towers Foundation: $26K across 1 grant, latest 2023Enterprise Holdings Foundation → Stephen Siller Tunnel to Towers Fou: $2K across 1 grant, latest 2023Gordon E and Betty I Moore Foundation → Colorado School of Mines: $800K across 3 grants, latest 2024Gordon E and Betty I Moore Foundation → Cornell University: $664K across 1 grant, latest 2020Gordon E and Betty I Moore Foundation → Trustees of Princeton University: $628K across 1 grant, latest 2020Gordon E and Betty I Moore Foundation → The Board of Trustees of the Univ of Illinois: $582K across 1 grant, latest 2020Gordon E and Betty I Moore Foundation → Trustees of Boston College: $338K across 1 grant, latest 2024The Minneapolis Foundation → Tunnel to Towers Foundation: $6K across 1 grant, latest 2023Enterprise Holdings Foundation → Stephen Siller Tunnel to Towers Foundation: $1K across 1 grant, latest 2021The San Francisco Foundation: $8.0M on this topic. Open the funder.The San Francisco Foundation$8.0MGordon E and Betty I Moore Foundation: $5.9M on this topic. Open the funder.Gordon E and Betty I Moore Fo…$5.9MGive Back Foundation: $1.4M on this topic. Open the funder.Give Back Foundation$1.4MThe Gregory and Claire Wilcox: $770K on this topic. Open the funder.The Gregory and Claire Wilcox$770KThe Iott Family Foundation: $400K on this topic. Open the funder.The Iott Family Foundation$400KThe Bank of America Charitable: $150K on this topic. Open the funder.The Bank of America Charitable$150KAmg Charitable Gift Foundation: $132K on this topic. Open the funder.Amg Charitable Gift Foundation$132KThe Minneapolis Foundation: $119K on this topic. Open the funder.The Minneapolis Foundation$119KSeattle Foundation: $86K on this topic. Open the funder.Seattle Foundation$86KBristol-Myers Squibb Foundation Inc: $35K on this topic. Open the funder.Bristol-Myers Squibb Foundati…$35KVerizon Foundation: $28K on this topic. Open the funder.Verizon Foundation$28KEnterprise Holdings Foundation: $16K on this topic. Open the funder.Enterprise Holdings Foundation$16KHarvard University: received $8.0M on this topicHarvard University$8.0MStephen Siller Tunnel to Towers Foundation: received $1.3M on this topicStephen Siller Tunnel to Towers…$1.3MTrustees of Princeton University: received $972K on this topicTrustees of Princeton University$972KCornell University: received $936K on this topicCornell University$936KThe Board of Trustees of the University of Illinois: received $935K on this topicThe Board of Trustees of the Un…$935KColorado School of Mines: received $800K on this topicColorado School of Mines$800KTunnel to Towers Foundation: received $776K on this topicTunnel to Towers Foundation$776KCornell University: received $664K on this topicCornell University$664KTrustees of Princeton University: received $628K on this topicTrustees of Princeton University$628KThe Board of Trustees of the Univ of Illinois: received $582K on this topicThe Board of Trustees of the Un…$582KTunnel to Towers: received $400K on this topicTunnel to Towers$400KTunnel to Towers Foundation (Stephen Siller Tunnel to Towers Foundation): received $354K on this topicTunnel to Towers Foundation (St…$354KTrustees of Boston College: received $338K on this topicTrustees of Boston College$338KTunnels to Towers Foundation: received $118K on this topicTunnels to Towers Foundation$118KStephen Siller Tunnel to Towers F: received $77K on this topicStephen Siller Tunnel to Towers…$77KStephen Siller Tunnel to Towers Fo: received $73K on this topicStephen Siller Tunnel to Towers…$73KStephen Stiller Tunnel to Towers Foundation: received $57K on this topicStephen Stiller Tunnel to Tower…$57KStephen Siller Tunnel to Towers: received $8K on this topicStephen Siller Tunnel to Towers$8KStephen Siller Tunnel to Towers Fou: received $2K on this topicStephen Siller Tunnel to Towers…$2K
12 funders, 19 recipients, grants matching “tunnel” 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 →