Glenbrook Underground INC has received $4.1 million across 32 grants from 20 funders over IRS Form 990 filings (2022–2025). Its largest funder is Vanguard Charitable Endowment Program.
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Vanguard Charitable Endowment Program has given $789K across 3 grants to Glenbrook Underground INC.
The Parasol Tahoe Community Foundation has given $650K across 3 grants to Glenbrook Underground INC.
National Philanthropic Trust has given $575K across 1 grant to Glenbrook Underground INC.
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