2025-10-09T16:06:52-05:00 2024-12-31 Foundation Source 3333 New Hyde Park Rd Ste 406 New Hyde Park NY 11042 990PF 2024-01-01 842382090 David Ian Stern Foundation % Foundation Source DAVI 8008391754 Foundation Source 501 Silverside Rd Wilmington DE 198091377 David Ian Stern President 8008391754 2025-09-27 true true Jeffrey D Haskell P01345770 8008391754 2024 2025-03-06 01:10:19Z X 2345237 X 0 X 28816 28816 25944 25944 408000 0 54760 54760 0 33765 33765 400 14277 14277 48442 33765 14277 0 0 48442 33765 14277 6318 20995 0 557235 748431 748431 399682 214804 223257 916508 916508 1373549 1873425 1879743 2345237 0 0 X 1873425 1879743 1873425 1879743 1873425 1879743 1873425 6318 1879743 1879743 Publicly-traded Securities 408000 408000 292 292 292 90 0 300 390 98 98 false false false false false false false true true DE true false false false false true Foundation Source 8008391754 501 Silverside Road Suite 123 Wilmington DE 198091377 false false false false false false false false false false false false false false false false false false false false false Howard Sontag Foundation Source 501 Silverside Rd Wilmington DE 198091377 Sec, Treas 5.0 0 0 0 David Ian Stern Foundation Source 501 Silverside Rd Wilmington DE 198091377 Dir, Pres 5.0 0 0 0 1492253 738127 0 2230380 0 2230380 33456 2196924 109846 109846 292 292 109554 109554 109554 14277 0 0 0 0 14277 109554 41347 41347 14277 14277 0 41347 41347 53930 David Ian Stern X 14 28816 14 25944 54760 54760 false false false false false false false false false false ISHARES S&P 500 INDEX FD 496900 686989 VANGUARD TOTAL STOCK MARKET ET 419608 686560 214804 223257 Administrative Fees 14252 14252 State or Local Filing Fees 25 25 Investment Management Services 33765 33765 990-PF Extension for 2023 400